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Ecological Studies of CT River,Vernon,Vt,Rept XI, Jan-Dec 1981
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l REPORT XI

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I VERMONT YANKEE g

NUCLEAR POWER CORPORATIOM

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ECO:. OG CA; SJ:IES OF EE I

CONNEC":CJ R VER I

VERNON/VER:M:ON

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I REPORT XI l

JANUARY 1981 - DECEMBER 1981 1

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PREPARED FOR g

VERMONT YANKEE NUCLEAR POWER CORPORATION l

BY AQUATEC, INC.

I SOUTH BURLINGTON, VERMONT 1982

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f ECOLOGICAL STUDIES OF TIIE CONNECTICUT RIVER REPORT XI VERMONT YANKEE NUCLEAR POWER CORPORATION TABLE OF CONTENTS 1.

INTRODUCTION AND

SUMMARY

l 11 2.

CONNECTICUT RIVER DISCIIARGE 3.

RIVER TEMPERATURE 17 4.

WATER QUALITY STUDIES 73 5.

PLANKTON STUDIES 117 5.1 Phytoplankton Studies 117 5.2 Zooplankton Studies 128 6.

ENTRAINMENT STUDIES 137 7.

BENTIIIC FAUNA STUDIES 143 8.

FISII STUDIES 157 8.1 Fish Impingement Studies 1 37 8.2 Resident Finfish Studies 159 LITERATURE CITED 187 I

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I LIST OF FIGURES 1.1 Vermont Yankee Power Level Histogram, 1981 3

1.2 Vermont Yankee Sample Stations 4

2.1 Connecticut River Discharge, Vernon, Vermont, 1981 12 j

3.1 Temperature, Station No.

3, 1981 18 3.2 Temperature, Station No. 7, 1981 19 4.1 Dissolved Oxygen, Station No. 3, 1981 78 4.2 Dissolved Oxygen, Station No. 7, 1981 79 4.3 pH, Station No.

3, 1981 80 4.4 pH, Station No.

7, 1981 81 4.5 Comparison of Observed Station 3 Sodium Ion Concentrations with Station 3 Concentrations Predicted from Preoperational/ Closed Cycle Data, I

Stations 7 and 3, 1969-1974 82 4.6 Comparison of Observed Station 3 Sulfate Ion Concentrations with Station 3 Concentrations I

Predicted from Preoperational/ Closed Cycle Data, Stations 7 and 3, 1969-1974 83 4.7 Comparison of Observed Station 3 Chloride Ion I

Concentrations with Station 3 Concentrations l

Predicted from Preoperational/ Closed Cycle Data, I

Stations 7 and 3, 1967-1974 84 4.8 Comparison of Observed Station 3 Alkalinity Concentrations with Station 3 Concentrations Predicted from Preoperational/ Closed Cycle Data, Stations 7 and 3, 1967-1974 85 5.1 Plankton Sample Station Locations 118 5.2 Seasonal Phytoplankton Distribution, Station No. 7 - Monitor 120 I

5.3 Seasonal Phytoplankton Distribution, Station No. 3 - Monitor 121 5.4 Seasonal Zooplankton Distribution, Station I

No. 7 - Monitor 130 5.5 Seasonal Zooplankton Distribution, Station No. 3 - Monitor 131 7.1 Benthic Fauna Sample Station Locations 144 8.1 Fish Sample Stations 162 8.2 Resident Fish Species.

Composition by Weight, 1981 Survey 173 8.3 Resident Fish Species.

Composition by Number, I

1981 Survey 173 8.4 Resident Fish Species.

Percentage Composition by Weight 174 8.5 Resident Fish Species.

Percentage Composition by Number 175 v

LIST OF FIGURES (CONT'D)

I 8.6 Age-Growth Graphs - White Perch 179 8.7 Age-Growth Graphs - Yellow Perch 181 8.8 Age-Growth Graphs - Walleyo 183 8.9 Age-Growth Graphs - Smallmouth Bass 185 LIST OF TABLES 2.1 Connecticut River Discharge Vernon, Vermont, Summary of Daily Means, 1965-1981 13 2.2 Connecticut River Discharge, Vernon, Vermont, Summary of Monthly Means, 1965-1981 13 2.3 Occurrence of Connecticut River Minimum Flow, Vernon, Vermont, 1981 15 3.1 Temperature Data, Station No. 3, 1981 24 l

3.2 Temperature Data, Station No. 7, 1981 36 E

3.3 Differences in Successive Hourly Mean Temperatures E

in *F at Monitor 3, 1981 48 3.4 Frequency Distribution of Rate of Change of Temperature at Monitor 3 During Open Cycle Operation, 1981 21 3.5 Differences in Hourly Mean Temperature in 'F Between Monitor 3 and Monitor 7, 1981 60 E

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3.6 Frequency Distribution of Differences in Hourly 5

Mean Temperatures Between Monitor 3 and Monitor 7 During Open Cycle Operation, 1981 23 4.1 Dissolved Oxygen and pH Data, Station No. 3, 1981 86 l

4.2 Dissolved Oxygen and pH Data, Station No. 7, 1981 98 4.3 Results, Water Quality Analysis, 1981 110 4.4 Summary of Statistics from Linear Regression Analysis of Preoperational and Closed Cycle Data i

at Stations 7 and 3 for Four Parameters 75 l

l 5.1 Dominant Phytoplankton Species, 1981 119 l

5.2 Comparison of Observed Monitor 3 Phytoplankton l

Count with Monitor 3 Count Predicted by Regression l

Analysis of Low Range Preoperational/ Closed Cycle l

Monitor Data, 1970-1974 123 5.3 Checklist of the Phytoplankton of the Connecticut l

River near Vernon, Vermont, 1981 126 5.4 Mean Percentages and Percentage Ranges of Diatoms, Flagellates, Green and Blue-Green Algae, 1981 124 5.5 Dominant Zooplankton Taxa, 1981 129 5.6 Comparison of Observed Monitor 3 Zooplankton Count with Monitor 3 Count Predicted by Regression Analysis

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of Preoperational/ Closed Cycle Monitor Data, 1970-1974 132 vi Il

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LIST OF TABLES (CONT'D)

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5.7 Checklist of the Zooplankton of the Connecticut River near Vernon, Vermont, 1981 134 5.8 Mean Percentages and Percentage Ranges of Protozoa, Copepoda, Cladocera, and Rotatoria, 1981 133 6.1 Summary of Results, Vermont Yankee Entrainment Studies, 1981 139

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6.2 Percent Changes in Live Plankton Concentrations Between Entrainment Intake and Discharge Samples 140 6.3 Calculated Percent Changes in Live Plankton

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Concentrations of River Effected by Entrainment 141 7.1 Checklist of the Benthic Fauna of the Connecticut p

River near Vernon, Vermont, 1981 150 L

7.2 Comparison of Number of Samples and Number of Genera of 3enthos Collected by Ekman Dredge 145 7.3 Summary of Results of Analysis, Benthic Fauna

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Samples, 1981 148 8.1 Summary of Weight and Total Length Extremes of Fish

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Species Collected in 1981 Impingement Studies 158 L

8.2 Summary by Month of Number and Weight of Fish Species Collected in Impingement Studies During 1981 Open p

Cycle Operation 160 L

8.3 Summary by Month of Number and Weight of Fish Species Collected in Impingement Studies During 1981 Closed Cycle Operation 161

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8.4 Summary of Fishing Effort and Results, 1981 163 8.5 Fishes of the Connecticut River in the Vicinity of Vernon, Vermont, All Collections, 1981 165

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8.6 Fishes of the Connecticut River in the Vicinity of L

Vernon, Vermont, All Collections North of Vernon Dam, 1981 166 8.7 Fishes of the Connecticut River in the Vicinity of FL Vernon, Vermont, All Collections South of Vernon Dam, 1981 168 8.8 Frequency Distribution of Fish Species by Total

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Length, 1981 170 8.9 Age-Growth Data - White Perch 178 8.10 Age-Growth Data - Yellow Perch 180 F

8.11 Age-Growth Data - Walleye 182 L

8.12 Age-Growth Data - Smallmouth Bass 184 E

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INTRODUCTION AND

SUMMARY

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INTRODUCTION AND

SUMMARY

Vermont Yar.kee Nuclear Power Corporation's generating station operated at an average power level of 81.1% for the year 1981.

This capacity factor was higher than Vermont Yankee's previous l

b record of power production, 80.7% in 1975.

Power was generated during 7412 hours0.0858 days 2.059 hours 0.0123 weeks 0.00282 months of 1981, 84.6% of the time.

During the hours of f

power generation, the average power level was 95.8%.

The open cycle mode of condenser cooling was used on 167 days of operation; closed cycle condenser cooling was used on 152 days of generation.

A 46 day shutdown for maintenance and refueling occurred from October 17 through December 1.

Figure 1.1 is a graph of the planc's record l

of power production in 1981.

Previous reports in this series have presented the results of environmental studies conducted under the conditions of Vermont Yankee's discharge permits, issued by the States of Vermont and New Hampshire, and the Appendix B Technical Specifications of Vermont Yankee's operating license.

The Tech Specs were deleted from the l

license in 1980, so this report, the eleventh in the series, details the studies conducted in 1981 to conform with the conditions of l

Vermont Yankee's NPDES permit.

l Eight sampling stations in the Connecticut River near vernon l

Vermont were used in earlier studies.

The approximate locations

.g of these stations are shown in Figure 1.2.

Collections were made at only six of these stations in the 1981 studies.

The locations g

of these six in river miles north and south of Vernon Dam are shown below.

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Station No.

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3 0.65 miles south 4

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5 1.25 miles north 7

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8 8.70 miles north

SUMMARY

OF RESULTS

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Water Quality Studies

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The maximum Connecticut River discharge of spring run-off occurred in 1981 in February, which is unusually early.

Spring run-off usually peaks at Vernon, Vermont in April.

The February 1981 maximum daily discharge, 63,833 cfs, was 65% larger than the February maximum of the preceding 16 years.

This early run-off of snowmelt resulted in lower river flow rates in April than are usually observed.

The maximum daily discharge in April 1981,

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29,685 cfs, was smaller than the maximum of any of the previous 16 years.

It was smaller even than the 16 year mean April flow

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rate of the years 1965-80.

Relatively high river flow rates were observed in September, October, and November.

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The early spring run-off resulted in warmer than usual river temperatures in the early months of 1981.

The maximum hourly temperature in February and March, both upstream and downstream of Vermont Yankee, exceeded the maximum observed in earlier years of study.

Monthly mean temperatures at Monitor 3, downstream of Vermont Yankee, exceeded 1968-80 average monthly temperatures for the first seven months of 1981.

New hourly minimum temperatures were observed both upstream and downstream of Vermont Yankee in September.

And in October,

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at both monitoring locations, the monthly mean temperatures were lower than the October mean in any earlier year of record.

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Vermont Yankee operated in 1981 within the three thermal criteria imposed upon such operation by its NPDES permit.

These -

conditions require that Vermont Yankee's discharge not effect a temperature at Monitor 3 greater than 65 F; the maximum hourly mean temperature observed there during open cycle operation was 60.6*F on May 10.

The maximum allowable rate of temperature change between successive hourly average temperatures at Monitor 3 is 5'F per hour; the maximum observed was 3.3 F per hour on December 31.

The maximum allowable increase in river temperature effected by Vermont Yankee's discharge is 13.4*F; the maximum difference observed between downstream Monitor 3 temperature and upstream l

Monitor 7 temperature was 10.9*F on January 25.

l No record minimum hourly average dissolved oxygen concen-trations were observed in 1981 at either the upstream or downstream l

l monitoring locations.

However, maxima observed upstream at Station 7 in August and September and downstream at Station 3 in September g

and October were greater than in earlier years of study.

The pH E

maximum of 7.7 observed at Station 3 in December was 0.1 pH units greater than the December maximum previously observed there.

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other pH maxima and all pH minima of 1981 were within extremes recorded in earlier years.

Grab samples were collected at Stations 3 and 7 on six dates t

l in 1981 and analyzed for sixteen water quality parameters.

The concentrations of all parameters were found to be within ranges

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observed in earlier years.

Biological Studies Diatoms predominated again, as in all former years of study, in the phytoplankton samples of 1981.

Also, as in earlier years, the more commonly observed diatoms were Asterionella formosa, Fragilaria capucina and F. crotonensis, Melosira italica and M. varians, and Tabellaria fenestrata.

And, as in prior studies, the commonly observed flagellates were Dinobryon spp., the more common green algae were Pediastrum spp., especially P.

simplex, and the more common blue-greens throughout the year were Oscillatoria spp.

In August, however, in samples both upstream and downstream of Vermont Yankee, high concentrations of the blue-green, Aphanizomenon -

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flos-aquae were found.

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Concentrations of phytoplankters at both upstream Station 7 and downstream Station 3 in May were more than two standard devia-tions above the 1970-74 means observed there.

The December algal

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count at Station 7 also exceeded the 1970-74 mean for that month by more than two standard deviations.

All downstream Monitor 3 algal b

concentrations observed in 1981 were within two standard errors of estimate of the concentration predicted by application of a statis-

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tical analysis of 1970-74 data to the Monitor 7 counts observed in 1981.

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One Monitor 3 zooplankton concentration in 1981 was more than two standard errors of estimate smaller than the count predicted by

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the statistics of the 1970-74 zooplankton data.

This was the sample of November, when Vermont Yankee was shutdown for annual refueling.

Both the June and November Monitor 7 zooplankton concentrations were more than two standard deviations greater than the means for those months in the years 1970-74.

Concentrations of zooplankters-b at Monitor 3 were generally low throughout the year.

The dominant zooplankters in the 1981 samples, as in those of earlier years, were rotatoria.

The more commonly observed rotifers were Keratella cochlearis, Philodina sp., and Polyarthra sp.

Protozoa,

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particularly Vorticella sp., were common in the samples of fall and winter; copepods were found throughout the year.

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A total of 128 taxa were observed in 38 benthic fauna samples, 27 collected by Ekman dredge and 11 by Henson trap.

Sixty taxa were'

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observed in Station 2 samples, 59 in Station 3 samples, 69 in Sta-tion 4 samples, and 67 taxa were found at Station 5.

The number of genera found in Ekman dredge collections was greater at all four sample stations in 1981 than in' earlier years when a similar sampling effort had been made.

As in former years, caddis fly and chironomid b

- larvae were the predominant organisms in most of the spring and summer samples.- Early fall samples showed a greater variety of domi-

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nant forms'- tubificids, planarians, and fingernail clams.

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Studies of the extent of fish impingement on Vermont Yankee's traveling screens were conducted during both open cycle and closed cycle operation in 1981.

The mean number of fish impinged per test day during open cycle operation in 1981 was 30.0; the mean weight per test day was 288 grams.

Each are within one standard deviation of the means observed in the five phase test program of 1974-78.

The average number of fish impinged per test day during closed cycle operation in 1981 was 0.40, the average weight per test day was 6.5 grams (0.23 ounces).

In 198i, 3359 fish were captured in 147 collections by trap net, gill net, and seine haul at Vermont Yankco Stations 2, 3,

4, 5, and 8.

Of the 21 species observed in the 1981 collections, 15 were cap-tured at locations both upstream and downstream of Vernon Dam.

Two species - fallfish and chain pickerel - were found only in collec-tions south of the dam, and four - Atlantic salmon, carp, silvery minnow, and tessellated darter - were found only in samples north of the dam.

A single Atlantic salmon was collected by trap net in June near Station 4.

Only one specimen of the species had been captured in earlier Vermont Yankee studies.

American shad have not been collected in prior Vermont Yankee fish surveys, but 25 juvenile shad were cap-tured in August 1981.

All other species collected in 1981 have been found in the studies of earlier years.

The percentages by weight of carp and indigenous cyprinids in the 1981 fish collections were smaller than those percentages in any prior survey.

The numbers of yellow perch and of rock bass captured in 1981 constituted larger percentages of the year's sample than the percentages by number for those species in earlier studies.

The age-growth data of 1981 for white perch captured north and south of Vernon Dam and the data for yellow perch taken north of the dam are not significantly different from that of the years 1969-73.

However, the data for yellow perch south of the dam and for walleye and smallmouth bass, both north and south of the dam, indicate an

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enhanced growth rate relative to the 1969-73 data.

Vermont Yankee's discharge of warm water to the river and the unusually warm ambient river temperatures in the early months of 1981 are probably contribut-ing factors to this apparent increase in rate of growth of these fish 1

species.

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CONNECTICUT RIVER DISCHARGE

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Connecticut River discharge in 1981 at Vernon, Vermont, computed from the records of the Vernon Hydroelectric Station

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at Vernon Dam, is summarized in Figure 2.1.

The mean flow rate,

'the maximum daily average flow rate, and the minimum daily average flow rate are plotted for each month of the year.

These data are also shown in Tables 2.1 and 2.2, along with summary data for the years 1965-80, years for which data have been reported in b

previous volumes of this series of reports.

Annual maximum discharge during spring run-off in the years b

1965-80 has occurred in April in all but three years.

In 1973 and 1979 the maximum was in March and in 1972 spring run-off peaked

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in May.

In 1981, however, this maximum occurred in February.

Mean discharge for that month was 23,999 cfs.

The maximum mean daily discharge was 63,833 cfs on 26 February and the maximum hourly discharge, 65,425 cfs, occurred at 0400 on 23 February.

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The February 1981 daily maximum of 63,833 cfs was 6'5% larger than the February maximum of the preceding 16 years, 38,696 cfs in 1973 (Table 2.1).

Also, the February monthly mean, 23,999 cfs, was greater than the maximum February mean in the years 1965-1980, 17,645 cfs in 1973 (Table 2.2).

This earlier than usual spring run-off resulted in much lower river flow rates in April than are usually observed then.

Maximum April 1981 daily discharge, 29,685 cfs, was smaller than the lowest maximum of the preceding 16 years, 34,100 cfs in 1966.

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In fact, the April 1981 maximum daily discharge was smaller than the mean April flow rate of the years 1965-80, 29,990 cfs.

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CONNECTICUT RIVER DISCHARGE VERNON, VERMONT l

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I TABLE 2.1 CONNECTICUT RIVER DISCHARGE VERNON, VERMONT

SUMMARY

OF DAILY MEANS 1965-1981 MAXIMA (cfs)

MINIMA (cfs)

MONTH 1965-80 EXTREMES (YEAR) 1981 1965-80 EXTREMES (YEAR) 1981 JAN 40,567(1973)-5,500(1971) 6,675 7,729(1973)-200(1967) 1,367 I

FEB 38,696(1973)-5,481(1980) 63,883 10,123(1976)-550(1967) 4,51 2 MAR 79,300(1968)-14,000(1971) 26,550 12,726(1976)-215(1967) 4,51 6 APR 81,853(1976)-34,100(1966) 29,685 22,771(1974)-7,348(1980) 11,491 I

MAY 75,900(1972)-16,341(1977) 21,042 16,000(1967)-1,362(1980) 3,917 JUN 39,075(1973)-9,410(1971) 10,064 8,150(1973)-186(1966) 2,738 JUL 80,217(1973)-4,532(1980) 9,222 3,454(1973)-174(1966) 1,324 AUG 38,390(1976)-4,190(1970) 14,838 3,916(1976)-125(1966) 1,41 5 I

SEP 25,718(1975)-4,713(1978) 23,987 3,504(1974)-125(1966) 1,357 OCT 60,665(1975)-5,990(1968) 46,517 6,432(1977)-200(1966-68) 6,367 NOV 40,700(1969)-5,930(1971) 26,333 7,835(1977)-128(1965) 7,824 DEC 70,550(1973)-6,128(1978) 10,149 8,608(1973)-240(1967) 3,418 TABLE 2.2 CONNECTICUT RIVER DISCHARGE

.I VERNON, VERMONT

SUMMARY

OF MONTHLY MEANS 1965-1981 MONTH 1965-80 EXTREMES (YEAR) 1965-80 MEANS(STND.DEV.)

1981

'm JAN 17,532(1973)-2,864(1971) 7,584(4,394) 2,750 l

FEB 17,645(1973)-2,865(1980) 7,601(4,840) 23,999 MAR 33,588(1979)-5,086(1967) 15,924(9,156) 10,174 APR 51,213(1969)-16,300(1965) 29,990(8,365) 16,593 MAY 42,540(1972)-8,425(1977) 20,440(9,175) 11,197 JUN 15,533(1973)-4,421(1980) 8,336(3,406) 7,524 JUL 21,832(1973)-1,800(1965) 5,417(4,938) 3,936 AUG 13,612(1976)-1,759(1970) 4,375(3,052) 6,486

. I SEP 7,184(1975)-1,846(1978) 4,154(1,836) 7,495 0CT 19,386(1977)-2,000(1964) 7,282(5,214) 14,625 NOV 17,710(1969)-3,138(1971) 9,072(4,332) 11,715

I DEC 23,774(1973)-2,990(1978) 9,568(4,857) 4,145 g

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Mean monthly discharges in the months August through November were greater than the 1965-80 means observed for those months.

The September mean of 7,495 cfs was greater than the largest mean for that month in the previous 16 years, 7,184 cfs in 1975.

The September and October means, as well as that of February, were all more than one standard deviation greater than the 1965-80 means for the corresponding month.

In seven months of 1981 the monthly mean flow rates were smaller than the means of the years 1965-80.

The monthly mean discharge of January, April, May, and December were more than one standard deviation smaller than the average flow for that month in the preceding 16 years.

The January mean of 2,750 cfs was smaller than the lowest mean of the years 1965-80, 2,864 cfs observed in 1971.

When Connecticut River discharge at Vernon is less than 10,000 cfs the Vernon Hydroelectric Station is operated as a peak load facility.

At such times, during off-peak hours only one hydroelectric unit is operated.

Operation of this unit complies with the condition of the station's operating license that a minimum flow of 1250 cfs be continuosly passed at the Vernon Dam.

In 1981, 211 periods of minimum flow occurred on 178 days.

Minimum flow was passed during 2138 hours0.0247 days 0.594 hours 0.00354 weeks 8.13509e-4 months , 24.4% of the time.

The duration of the minimum flow periods ranged from 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months to 47 hours5.439815e-4 days 0.0131 hours 7.771164e-5 weeks 1.78835e-5 months ; the average duration was 10 hours1.157407e-4 days 0.00278 hours 1.653439e-5 weeks 3.805e-6 months .

l A summary by month of the occurrence of minimum flow at I

Vernon in 1981 is shown in Table 2.3.

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TF.BLE 2.3 I

OCCURRENCE OF CONNECTICUT RIVER MINIMUM FLOW l

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LONGEST MONTH NO. HOURS

% OF HOURS NO. DAYS NO. PERIODS DURATION (HRS)

JAN 546 73.4 31 46 35

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MAY 83 11.2 10 13 15 JUN 118 16.4 13 13 22 ll JUL 428 57.5 29 33 38 l

AUG 257 34.5 24 26 31 SEP 324 45.0 22 24 47 OCT 49 6.6 8

8 11 NOV 7

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DEC 213 28.6 25 31 12 I

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RIVER TEMPERATURE Temperatures of Connecticut River water are measured continu-(

ously by two automatic water quality monitoring systems, installed in buildings on the Vermont shore of the river at Sample Station

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7, upstream of Vermont Yankee, and at Station 3, downstream of the plant.

The temperature data of 1981, reduced to hourly, daily, and monthly means, are shown in Tables 3.1, for Station No. 3, and

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3.2, for Station No. 7, at the end of this section of the report.

These data are summarized graphically in Figures 3.1 and 3.2.

The

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maxima and minima in those figures are hourly means.

Temperature data have been collected continuously since 1968 at Station 3 and since 1970 at Station 7.

Figures 3.1 and 3.2 also show, in shaded areas, the maximum and minimum hourly mean

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temperature that has been observed for that month in any of the previous years of study.

The shaded area is divided by a line that

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connects the points of mean monthly temperatures computed from the data of all previous years for that month.

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The low mean river flow rate in January and the earlier than usual spring run-off effected record temperature maxima in the first three months of 1981.

The maximum hourly temperature in February and March at both the upstream and downstream monitors exceeded the maxima observed in prior study years.

The January maximum of F

42.9'F at Monitor 3 was also greater than that previously observed there, 42.2*F in 1979.

Monthly mean temperatures at the downstream station were greater than the average of the years of previous record, 1968-80,

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for the first saven months of 1981.

The January mean at Station 3, E s

TEMPERATURE STATION NO.3 19 81 ar ac 90

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MO NTHLY AVERAGE See text.

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TEMPERATURE STATION NO.7 19 81 ar ac 90

- 30 80 -

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--0 A'i,_"

1 I

2 3

4 5

6 7

8 9

10 11 12 MONTH SHADED AREA l

Maxima,means and minimo MONTHLY MAXIMUM

--~~~

observed in 1970-1980.

MONTHLY AVERAGE See text.

M NTHW MINIMUM FIGURE 3. 2

I 36.8*F, was greater than the previous record for that month, 36.4*F, in 1977, and the March mean, 37.9 F, exceeded the previous down-stream March record, 36.l*F in 1980.

The upstream March mean temperature, 36.1 F, was also greater than the March mean of prior years, 35.8*F in 1977.

New temperature minima were established in September and October.

At both monitoring locations, the hourly minimum temperatures observed in September were lower than those of previous years.

The September minimum at Station 3 was 54.8*F; the lowest minimum of earlier years was 57.7*F in 1975.

At Statien 7, the September min-imum was 54.6 F, the prior low of record was 56.7*F in 1977.

The average temperature in October, both upstream and downstream of Vermont lankee, was lower than the October mean of any previous year of monitoring.

In 1981, Vermont Yankee operated in the open cycle mode of condenser cooling from January 1 through May 15, October 15 and 16, and December 2 through 31.

Such operation is permitted in the period October 15 through May 15 under thermal effluent limitations set forth in Verm)nt Yankee's NPDES permit.

These criteria, which define the maximum allowable-thermal impact on the Connecticut River of Vermont Yankee's discharge of heated condenser cooling water, are as follow:

A.

The temperature at Monitor 3 during open cycle operation shall not exceed 65*F; B.

The rate of change of temperature at Monitor 3 shall not exceed 5*F per hour; and C.

The increase in temperature above ambient at Monitor 3 shall not exceed 13.4*F.

The temperature records at Stations 7 and 3 show that these thermal limitations were not exceeded during open cycle operation in 1981.

The maximum hourly average temperature observed at Monitor 3 was 60.6 F on May 10.

The maximum rate of change of temperature at Monitor 3, the difference'between successive hourly average temperatures there, was +3.3*F/ hour, observed on December 31.

[

Table 3.4 Frequency Distribution of

[

Rate of Change of Temperature at Monitor 3 During Open Cycle Operation 1981

(-

Rate of Temperature JAN FEB MAR APR 1-15 15-16 2-31 Totals Change MAY OCT DEC

'F/hr

-2.4 1

1

-2.3 1

1

-2.2 1

1

-2.1

-2.0

-1.9

-1.8 1

1

-1.7 1

1 1

3 6

[

-1.6 3

1 1

4 9

-1.5 3

2 1

5 11

-1.4 1

7 8

-1.3 2

1 1

7 11

-1.2 9

2 1

8 20

-1.1 3

2 1

2 8

16

-1.0 7

1 3

7 18

-0.9 6

3 4

1 1

7 22

-0.8 11 6

4 1

5 27

[

-0.7 8

4 2

11 25

-0.6 20 4

1 1

12 38

-0.5 1 23 5

6 7

14 55

-0.4 35 2

12 3

6 10 68

-0.3 38 11 14 8

3 5

15 94

-0.2 52 19 51 51 27 7

27 234

-0.1 78 113 150 169 69 5

128 712 0.0 65 292 233 247 87 8

239 1.76 0.1 81 94 150 128 76 5

67 601

[

0.2 56 22 53 87 45 5

28 296 0.3 43 15 17 19 19 2

18 133 0.4 48 7

8 4

7 8

82 0.5 28 2

4 3

2 2

12 53 0.6 19 3

5 1

2 7

37 0.7 12 4

5 3

1 10 35 0.8 9

1 5

2 4

21 1

0.9 3

1 1

1 6

12 l

1.0 1

1 3

5

[

1.1 6

1 2

2 11 1.2 3

2 4

9 1.3 4

2 5

11 1.4 1

1 2

4 1.5 1

1 2

1 5

1.6 4

2 6

1.7 1

1 1

1 4

8 1.8 1

1 2

1.9 1

1 2

2.0 1

1 1

2 5

2.1 1

2 3

2.2 1

1 2

4 2.3 2.4 2.5 2.6 4

4 2.7 2.8 3

3 2.9 1

1 3.0 2

2 3.1 3.2 1

1 3.3 1

1 E ~

I The greatest rate of temperature decrease was -2.4'F/ hour on January 9.

Tabulations of the hourly rates of change in Monitor 3 temperatures during 1981 are given in Table 3.3.

These data are summarized, for the dates of open cycle operation, as a frequency distribution in Table 3.4.

For the rate of temperature change data during open cycle operation in 1981, three measures of central tendency, the mode, median, and mean, were all 0.0'F.

The hourly mean Monitor 3 temperatures (Table 3.1) minus the corresponding Monitor 7 temperatures (Table 3.2) are shown for the year 1981 in Table 3.5.

These data are reduced to a frequency distribution of temperature differences, for the dates of open cycle operation, in Table 3.6.

The greatest difference observed during 1981 open cycle operation was +10.9'F on January 25 at 2300.

The mode and median of these data were each +1.8*F and the mean increase in temperature above ambient at Station 3 was

+2.3*F during open cycle operation in 1981.

I I

I Table 3.6 Frequency Distribution of Differences in Hourly Mean Temperatures Between Monitor 3 and Monitor 7 During Open Cycle Operation 1981 Hourly Hean JAN FEB MAR APR 1-15 15-16 2-31 Totals AT(*F)

MAY OCT DEC E

-1.0 - -0.6 3

4 7

-0.5 - -0.1 1

6 1

10 4

22 0.0 4

1 11 2

18 0.1 - 0.5 14 65 16 28 32 9

77 141 0.6 -

1.0 20 229 94 66 49 7

95 560 1.1 -

1.5 36 92 161 258 24 5

86 662 1.6 - 2.0 31 126 229 220 54 5

222 887 2.1 -

2.5 28 28 126 60 70 2

81 395 2.6 - 3.0 44 12 49 13 53 7

37 215 3.1 - 3.5 49 8

23 25 6

19 130 3.6 - 4.0 58 11 10 11 1

11 102 4.1 - 4.5 55 10 12 6

13 96 4.6 - 5.0 46 9

7 8

10 80 5.1 - 5.5 47 7

6 3

22 85 5.6 -

6.0 50 5

2 27 84 6.1 -

6.5 35 15-50 6.6 -

7.0 29 2

3 34 7.1 - 7.5 35 5

2 42 7.6 - 8.0 35 7

42 8.1 - 8.5 17 4

21 8.6 - 9.0 16 1

17 9.1 - 9.5 15 2

17 9.6 - 10.0 i7 3

20 10.1 - 10.5 8

4 12 10.6 - 11.0 3

3 TABLE 3.1-1 AVERACE HOURLY TEMPERATURE IN *F VER310NT YANKEE SAMPLE STATION NO. 3 JANUARY 1981 DAILY DA7 HOUR AVERACE I

2 3

4 5

6 7

8 9

10 11 12 li 14 15 16 17 18 19 20 21 22 23 24 1

33.2 33.2 33.I 33.8 33.4 33.0 32.9 32.9 32.9 33.0 33.1 33.2 33.4 33.6 33.7 33.8 33.8 %.0 34.2 34.1 %.0 %.0 33.9 33.8 33.5 2

33.7 33.6 33.5 33.4 33.2 31.2 33.1 33.3 34.0 %.6 34.6 34.1 33.7 33.5 33.3 33.2 33.2 33.0 32.7 12.5 32.4 32.3 32.2 32.1 33.3 3

32.I 32.1 32.0 32.0 32.0 32.0 32.1 32.1 32.1 32.2 32.3 32.4 32.5 32.6 32.6 32.7 32.7 32.7 32.8 32.9 33.0 13.1 33.2 33.3 32.5 4

33.4 33.6 33.7 33.8 33.9 34.1 34. 3 %.4 v.6 34.8 %.9 35.2 35.6 35.9 36.I 36. 2 36.4 36.5 36.7 36.9 37.1 37.3 37.4 37.6 35.4 5

37.6 37.6 37.5 37.5 37.6 37.6 37.5 37.3 27.5 37.8 37.0 35.8 34.9 M.3 33.9 33.7 33.6 33.5 33.5 33.4 33.3 33.3 33.3 33.2 35.5 6

33.2 33.1 33.0 33.0 33.4 33.8 34.2 34.6 35.5 36.0 36.2 36.3 SYSTDI INDPER ATIVE 34.4 7

SYSTDt INOPERATIVE 39.0 17.9 %.4 35.3 %.8 %.4 %.3 8

%.4 %.4 %.6 35.0 35.I 15.4 35.8 36.2 37.5 38.7 37.5 36.0 35.5 35.3 35.3 35.2 35.3 37.4 36.4 35.2 %.4 %.I 33.8 33.7 35.5 9

33.6 33.6 33.8 34.3 %.8 35.3 35.7 36.2 37.8 39.5 37.1 35.7 35.2 34.8 %.7 34.7 %.6 34.6 35.0 35.3 35.6 35.9 36.4 %.8 35.5 10 37.2 38.0 38.8 39.2 39.5 39.6 39.5 39.6 39.7 39.8 39.8 40.0 39.9 39.8 39.6 39.3 38.8 38.7 37.9 %.3 35.5 34.8 34.6 M.5 38.4 11

%.3 34.1 34.0 %.2 %.6 34.7 35.1 35.5 35.7 36.0 36. 7 17.5 38.3 38.5 38.6 38.5 38.3 38.1 38.0 38.0 38.0 38.1 17.9 38.0

%.7 b

12 37.9 37.9 38.0 38.0 38.1 38.3 38.5 38.7 39.0 38.4 37.6 36.7 36.1 35.8 35.6 35.4 35.3 %.6 36.6 35.6 35 I 34.9 34.5 %.4

%.8

.p.

13

%.5 34.6 35.0 35.5 35.9 %.4 36.7 36.9 38.3 39.5 38.0 36.4 35.9 35.6 35.5 35.4 35.2 35.8 37.8 37.5 37.0 %.5 %.I 15.6 36.3 4

14 35.4 35.3 35.5 35.9 36.3 %.6 %.9 37.1 18.7 39.5 40.0 39.1 37.8 37.2 M.8 36.5 36.8 37.1 38.2 37.8 %.5 35.8 M.4 35.I 37.0 15 34.9 34.8 34.8 34.9 35.2 35.5 35.8 36.3 38.2 38.8 40.0 39.4 38.2 37.4 36.9 %.7 36.6 37.4 36.2 35.7 35.5 35.0 %.8 %.8

%.4 16

%.7 34.7 %.9 35.4 M.6 M.2 37.0 37.6 38.9 39.6 38.9 37.7 %8 36.6 %.5 36.4 36.3 36.9 38.5 38.1 %.9 36.6 36.1 36.0 36.8 17 35.8 35.8 36.0 36.3 36.5 36.2 35.8 35.8 35.7 35.6 35.5 35.6 35.7 35.9 35.9 35.7 35.5 35.6 35.4 35.0 %.8 34.4 34.3 34.1 35.5 18

%.0 33.8 33.7 33.4 33.2 32.8 32.8 32.9 33.8 33.2 33.6 34.I 34.8 35.1 35.6 36.2 36.4 36.7 37.4 38.1 37.7 37.4 36.2 %.0

%.9 19 35.9 %.0 36.2 36.6 36.7 37.0 37.3 37.4 37.8 38.5 38.0 37.3 36.9 36.8 36.6 36.5 M.9 36.2 37.3 36.9 %.4 %0 35.9 35.3

%.7 20 35.3 35.6 35.7 36.1 36.3 %.7 37.I 37.5 38.5 40.0 39.0 38.5 37.9 37.7 37.5 37.2 %.7 37.2 38.3 37.3 36.6 %.1 35.6 35.3 37.1 21 35.3 35.3 35.4 35.6 %.! 36.4 M.7 37.2 37.6 37,9 38.6 39.7 40.2 40.3 40.5 40.6 40.6 40.5 40.2 39.0 38.0 37.4 36.9 36.6 38.0 22 36.2 35.9 35.8 %.i %.5 %.9 37.3 17.7 38.5 39.3 39.8 39.8 39.4 39.3 39.1 39.0 38.4 38.2 38.2 39.3 39.6 39.4 39.2 39.1 38.2 23 38.5 38.1 37.6 37.4 37.5 37.9 38.2 38.6 39.3 39.9 40.5 40.4 39.6 39.4 39.2 39.I 38.4 38.0 38.3 38.7 37.7 36.6 %.2 36.0 38.4 24 35.7 35.4 35.3 35.3 3;.6 %.I 36.5 36.9 37.4 38.0 38.7 39.1 39.6 40.2 40.4 40.6 40.7 40.8 41.3 40.9 39.3 39.0 38.7 38.1 38.3 25 37.4 37.0 36.6 36.6 36.9 37.1 37.3 37.5 37.6 37.6 37.9 39.2 40.8 41.5 41.9 42.1 42.2 42.1 43.9 41.8 42.3 42.8 42.9 42.6

'9.7 26 42.2 41.8 41.2 41.0 40.8 40.9 41.3 41.7 41.5 41.8 41.4 39.7 38.9 38.2 37.3 36.9 37.5 37.4 37.1 36.2 35.6 35.0 %.8 34.7 39.0 27 34.7 34.7 M.7 34.8 35.1 35.5 %.0 36.6 38.8 39.9 40.2 SYSTDI INOPERATIVE 28 SYSTDI INOPERATIVE 40.0 39.7 39.3 39.0 39.2 38.9 38.6 38.8 39.I 40.0 39.9 39.4 39.1 38.3 39.2 29 38.0 38.1 38.2 38.3 38.5 39.1 39.7 39.8 40.1 40.4 40.5 41.2 41.7 42.0 42.2 42.3 42.3 48.7 41.3 41.2 41.3 41.4 41.4 41.1 40.5 30 40.7 40.2 39.6 39.3 39.4 39.5 39.7 39.9 40.0 40.1 41.0 41.1 40.9 40.6 40.3 39.5 39.2 39.6 39.6 38.6 37.8 37.5 %.9 36.4 39.5 31 36.2 35.9 36.0 36.4 %.8 37.2 37.6 38.2 38.6 39.0 39.4 39.7 40.3 40.9 41.5 41.6 41.6 41.7 41.9 41.9 42.0 43.9 41.6 41.0 39.5

'f0NTHLY AVERACE M.8 m

m W

M M

E

TABLE 3.1-2 AVERACE HOUBLY TEMPERATURE IN *F VERMONT T4NKEE SAMPLE STATION NO. 3 FEBRUARY 1981 DAILY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

10 12 13 14 15 16 17 18 19 20 21 22 23 24 1

40.3 39.7 39.4 39.4 39.6 39.6 39.9 40.2 40.3 40.5 40.7 41.1 41.4 41.8 42.8 42.1 42.2 42.1 41.9 48.6 39.4 37.9 37.1 36.7 40.3 2

%.5 36.2 %.I 36.2 M.3 36.7 37.3 38.7 39.6 39.5 18.0 36.3 35.5 35.0 %.8 34.7 %.4 34.1 34.0 33.9 33.8 31.7 33.7 33.7 35.8 3

33.7 33.7 33.7 33.7 33.6 33.6 33.7 33.6 33.6 33.7 33.7 33.8 33.8 33.9 34.0 33.9 33.9 3?.9 33.9 33.8 33.8 33.8 33.7 33.7 33.8 4

33.7 33.7 33.6 33.6 33.6 33.6 33.6 33.6 13.5 33.5 33.5 33.5 33.5 33.5 33.6 33.7 33.8 33.7 33.7 33.7 33.7 33.7 33.6 33.6 33.6 5

13.6 33.6 33.6 33.5 33.5 33.6 33.5 33.5 33.6 33.6 33.7 33.7 33.8 34.0 %.0 34.1 34.0 34.0 33.9 33.9 33.9 33.9 33.8 33.8 33.8 6

33.8 33.8 33.7 33.6 33.5 33.4 33.6 35.6 37.4 %.2 35.1 34.4 34.2 %.I 34.0 34.0 34.2 K.5 %.3 34.1 33.9 33.8 31.8 33.8 34.3 7

33.8 33.7 %.0 35.3 %.3 37.0 37.1 36.9 17.2 %.7 35.9 15.1

%.4 %.2 34.0 34.1 34.1 34.7 35.4 34.8 %.3 %.0 31.9 33.9 35.0 8

33.8 33.9 34.0 %.0 %.2 34.8 35.3 35.7 %.0 %.3 36.6 37.8 38.6 39.8 19.7 39.1 37.9 37.0 35.9 34.9 34.3 34.1 13.9 31.9 35.9 9

33.9 33.9 33.9 34.0 34.3 34.6 35.3 36.6 37.7 M.9 35.6 34.8 %.4 34.1 %.! 34.0 33.9 33.8 33.8 33.8 33.8 33.7 33.7 33.6 34.5 10 33.5 33.5 33.5 33.5 33.6 33.8 34.2 35.7 37.4 37.5 35.9 35.0 %.5 34.3 %.! 34.0 33.9 33.8 33.8 33.8 33.8 33.8 13.8 33.8 34.4 II 33.8 33.8 34.3 35.0 35.4 35.6 36.0 36.3 35.6 34.7 34.2 %.I 34.0 33.9 34.1 34.1 34.1 %.0 %.0 33.8 33.5 33.3 33.0 32.9

%.3 12 32.8 32.8 32.7 32.7 32.8 12.8 32.7 32.5 32.6 32.7 32.8 32.7 32.9 32.8 32.8 32.8 12.8 32.7 32.7 32.6 32.6 32.6 32.6 32.6 32.7 Ln 13 32.6 32.6 32.5 32.6 32.6 32.5 32.5 32.5 32.5 32.6 32.7 32.8 32.8 32.8 32.8 32.8 32.8 32.7 32.7 32.6 32.6 32.6 32.6 32.6 32.6 1

14 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.7 12.7 32.7 32.8 32.9 32.9 33.0 33.0 33.1 33.1 33.0 32.9 32.9 32.9 32.9 32.9 32.8 32.8 15 32.8 32.8 32.8 32.7 32.8 32.8 32.8 32.8 12.9 32.9 33.0 33.0 33.0 33.1 33.2 33.2 33.2 33.2 33.2 33.1 33.1 33.2 33.1 33.2 33.0 16 33.1 33.1 31.1 33.1 33.1 33.1 33.0 32.9 32.9 33.0 33.1 33.2 33.4 33.4 33.5 33.5 33.5 33.5 33.4 33.4 33.3 33.3 33.3 33.3 33.2 17 33.3 33.2 33.2 33.2 33.2 33.2 33.2 3J.I 33.0 33.0 33.1 33.1 33.3 33.5 33.6 33.7 SYSTEM INOPERATIVE 33.2 18 SYSTEM INOPERATIVE 19 SYSTEM INOPERATIVE 33.2 33.2 33.2 33.4 33.4 33.4 33.4 33.3 33.2 33.2 33.2 33.2 33.2 13.2 33.3 33.3 20

3. 2 33.1 33.1 33.1 33.1 33.1 33.1 33.1 33.1 33.0 32.9 32.9 32.9 32.9 32.9 32.9 32.9 32.8 32.8 32.8 32.8 32.8 32.8 32.8 13.0 21 32.8 32.8 32.8 32.8 32.8 32.8 32.8 32.8 32.8 33.0 32.7 32.7 32.7 32.7 32.7 32.7 32.7 32.7 32.7 32.6 32.6 32.6 32.6 32.6 32.7 22 32.5 32.5 32.4 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.7 32.7 32.7 32.7 32.7 32.6 32.6 32.6 32.6 32.5 32.4 32.4 32.6 23 32.4 32.4 32.2 32.4 32.7 32.6 32.4 32.3 32.2 32.2 32.2 32.2 32.2 32.3 32.5 32.6 32.9 32.6 32.8 32.9 33.0 33.1 33.1 33.1 32.6 24 33.2 33.2 33.3 33.3 33.4 33.4 33.4 33.5 33.5 33.5 33.6 33.7 33.8 33.8 33.9 34.0 %0 33.9 %.0 %.I 34.1 %.I %.2 %.1 33.7 25 34.2 34.3 34.2 %.3 %.3 34.4 %.4 %.5 %.7 34.6 %.6 34.7 34.7 34.7 34.7 34.6 34.5 %.5 %.5 34.5 34.4 34.3 34.2 %.1 M.5 26

%0 33.9 33.8 33.8 33.9 33.9 33.9 33.9 33.9 33.9 33.9 34.0 34.1 34.1 34.1 34.2 %.3 34.3 34.3 %.3 34.3 34.4 %4 34.3

%.I 27

%.3 34.4 34.3 %.3 %.3 34.3 34.2 34.2 34.2 M.2 34.3 %.4 34.6 34.7 %.8 34.9 35.0 35.0 35.1 35.1 35.1 35.0 35.0 %.9

%.6 28 M.9 34.8 %.8 %.8 34.8 34.7 34.7 %.7 %.7 34.8 34.8 34.8 34.8 34.7 34.7 34.8 %.8 34.8 %.E 14.8

%.7 34.7 34.7 34.6 34.8 MONTHLY AVERACE

%.I

TABI,E 3.1-3 AVERACE HOURLY TEMPERATURE IN 'T VERMONT YANKEE SAMPLE STATION No. 3 MARCH 1981 DAILY DAY HOUR AVERACE 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 i

M.7 %.6 34.5 34.6 %.6 34.5 34.6 34.6 34.6 %.7 %.7 34.7 34.8 35.0 35.1 35.1 35.2 35.3 35.2 %3 35.2 35.2 35.1 35.1 34.9 2

35.0 35.0 34.9 34.9 %.9 34.8 34.8 34.8 34.8 34.9 35.0 35.1 35.2 35.2 35.4 35.3 35.4 35.4 35.4 35.4 35.3 35.3 35.2 35.2 35.1 3

35.1 35.1 35.0 35.0 %.9 34.8 34.8 34.8 34.7 %.8 34.9 34.9 35.1 35.2 35.3 35.5 35.5 35.5 35.5 35.4 35.4 35.4 35.3 35.1 35.1 4

35.1 35.0 35.0 34.9 34.8 34.8 34.7 34.7 34.7 %.8 35.1 35,2 35.3 35.3 35.? 35.5 35.4 35.3 35.1 35.0 35.1 35.1 35.1 35.1 35.1 5

35.1 35.0 35.0 35.0 35.1 35.1 35.1 35.0 35.0 35.2 35.4 35.4 35.6 35.8 %.0 %2 36.7 35.3 36.4 36.3 %3 36.2 36.1 %.1 35.6 6

36.I 36.1

%.0 36.1 35.9 35.8 35.5 35.4 35.4 35.4 35.4 35.4 35.5 35.6 35.7 35.8 35.8 33.8 33.7 35.6 35.5 35.5 35.5 35.4 35.7 7

35.5 35.5 35.5 35.5 35.5 35.5 35.5 35.5 35.5 35.6 35.6 35.7 35.8 36.0 36.0 36.1 36.1 36.0 36.0 35.9 35.9 35.8 35.8 35.8 35.7 l

8 35.8 35.7 35.7 35.8 35.9 36.0 %.0 36.1 36.1 %.! 36.2 36.2 36.3 %.3 36.5 36.4 36.5 %.5 36.4 36.4 %.3 %.3 36.2 36.2 36.2 M

9 36.2 36.2 36.4 36.5 %.4 36.4 36.5 36.5 36.3 36.3 36.4 36.5 36.6 %.7 %.7 36.7 36.6 %.6 36.6 36.6 36.6 36.6 36.6 36.5

%5 f

10 36.4 %4 36.4 %.4 36.4 %.4 %.4 %.4 36.4 %.5 36.8 36.8 37.0 37.1 37.2 37.4 37.4 37.4 37.4 37.3 37.3 37.2 37.2 37.2 36.9 11 37.1 37.1 37.0 37.1 37.0 37.0 37.0 37.1 37.1 37.1 37.3 37.2 37.5 37.5 37.6 37.7 37.7 37.8 37.7 37.8 37.8 37.7 37.7 37.6 37.4 12 37.6 37.4 37.7 38.3 38.2 38.3 38.6 38.4 38.3 37.5 37.5 37.5 37.7 37.9 38.0 37.8 37.7 37.7 37.7 37.6 37.6 37.7 37.7 37.8 37.8 13 37.7 37.8 37.9 38.0 37.9 37.9 37.8 37.8 37.7 37.6 37.8 37.9 38.1 38.2 38.2 38.4 38.4 38.4 38.2 38.3 38.3 38.3 38.3 38.2 38.0 14 37.9 38.1 38.0 37.7 37.6 37.6 37.3 37.1 37.0 36.7 36.6 36.7 36.8 37.0 37.0 37.3 37.5 37.1 36.9 36.8 %.8 36.7 36.7 36.7 37.2 15

%.7 %.7 36.9 37.0 37.1 37.0 37.0 37.0 37.1 37.2 37.0 37.1 37.3 37.5 37.6 37.7 37.7 37.6 37.5 37.6 37.4 37.3 37.3 37.4 37.2 16 37.4 37.3 37.6 38.0 38.6 38.7 38.6 39.0 39.2 37.9 37.7 37.7 37.7 37.8 37.8 37.8 37.8 37.8 37.7 37.6 37.6 37.6 37.6 37.5 37.9 l

17 37.7 37.7 37.7 37.8 38.4 38.9 39.1 39.0 38.7 37.7 37.3 37.4 37.5 37.6 37.6 37.5 37.5 37.4 37.2 37.1 36.6 %.2 36.0 35.9 37.6 18 35.7 35.5 35.6 35.7 35.8 36.0 36.2 %.8 36.5 36.2 35.8 35.8 36.0 36.1 %.3 36.4 36.5 36.4 36.8 36.6 %.0 35.8 35.8 35.9 36.1 19

%.0 36.2 %.6 36.6 36.5 36.6 36.6 36.6 36.7 %.9 37.2 37.0 37.0 37.0 37.1 37.1 37.0 %.8 36.7 36.6 36.5 36.4 %.4 36.4 36.7 20

%.5 %.4 36.4 36.5 36.5 %.3 36.4 37.5 39.0 39.1 37.9 37.6 37.4 37.4 37.4 37.4 37.3 37.3 37.2 37.0 36.9 36.9 36.8 %.9 37.2 21 36.9 37.0 37.2 37.3 37.2 37.1 36.9 37.0 38.6 40.6 39.7 38.9 38.4 38.3 38.4 38.4 38.6 39.4 38.9 38.0 37.8 37.5 37.5 37.3 38.0 22 37.3 37.4 37.3 37.3 37.1 37.3 38,0 38.7 39.5 40.1 40.9 41.4 40.6 39.6 39.2 39.2 39.3 39.8 39.6 39.4 38.4 38.1 38.0 37.8 38.8 23 38.1 38.3 38.3 38.1 38.1 38.0 37.7 39.3 40.8 39.2 38.1 38.0 38.1 38.3 38.4 38.4 38.5 38.4 38.3 38.3 38.2 38.2 38.0 38.I 38.4

(

24 38.1 38.1 38.! 38.1 38.0 38.0 38.9 41.1 42.2 42,0 41.8 41.3 40.9 40.5 39.6 39.5 39.4 39.2 39.3 39.3 39.2 39.2 39.0 38.9 39.6 25 38.8 38.8 38.8 38.8 38.8 38.9 38.8 39.5 41.2 41.3 41.3 41.1 40.6 40.1 39.7 39.8 39.7 39.6 39.6 39.5 39.4 39.2 38.9 38.9 39.6 26 38.7 38.7 36.6 38.7 38.6 38.7 39.5 39.9 39.1 39.0 39.3 39.6 39.8 39.9 40.1 40.2 40.2 40.0 39.9 39.8 39.8 39.7 39.8 39.9 39.5 27 40.0 40.0 40.1 40.1 40.2 40.0 40.7 41.4 41.0 40.6 40.5 40.4 40.5 40.5 40.6 40.6 40.6 40.5 40.6 40.5 40.6 40.6 40.7 40.8 40.5 28 40.8 40.8 40.8 40.9 40.8 40.8 40.8 40.8 40.7 a.O.6 40.8 40.9 41.0 41.2 41.2 41.3 41.3 41.3 41.4 41.5 41.4 41.5 41.6 41.7 41.1 29 41.9 41.7 41.5 48.4 41.4 41.4 41.2 41.2 41.3 41.4 41.7 42.0 42.3 42.5 42.8 43.1 43.3 43.5 43.6 43.6 43.6 43.5 43.4 43.4 42.4 30 43.5 43.4 43.4 43.2 43.5 44.3 43.4 43.1 43.1 43.1 43.2 43.2 43.4 43.8 43.9 43.9 44.1 44.3 44.4 44.2 44.1 44.1 44.1 44.2 43.7 31 44.3 44.3 44.4 44.1 44.0 43.9 43.9 44.1 44.5 44.9 45.0 44.9 44.9 44.7 44.5 44.3 44.2 44.2 44.1 43.9 43.8 43.7 43.6 43.4 44.2 MONTHLY AVERACE 37.9 m

M M

TABLE 3.1-4 98 6 AVERACE HOUBLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE STATION NO. 3 APRIL 1981 DAILY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

to 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1

43.3 43.2 43.1 42.9 42.8 42.7 42.6 42.5 42.5 42.5 42.6 42.7 42.9 43.0 43.2 43.3 43.3 43.3 43.3 43.3 43.3 43.4 43.4 43.6 43.0 2

43.5 43.5 43.4 43.5 43.5 43.4 43.4 43.4 43.4 43.5 43.6 43.7 43.9 44.0 44.1 44.1 44.1 44.2 44.3 44.3 44.3 44.2 44.1 44.0 43.8 3

43.9 43.8 43.7 43.6 43.5 43.3 43.1 43.0 42.9 42.9 42.9 42.9 43.1 43.2 43.4 43.5 43.7 43.8 43.9 44.0 44.0 44.0 44.0 44.0 43.5 4

4*.I 44.0 43.9 44.0 43.9 43.8 43.8 43.8 43.7 43.8 43.8 43.9 44.0 44.0 44.1 44.4 44.5 44.5 44.5 44.5 44.5 44.6 44.6 44.8 44.1 5

44.8 44.9 45.0 45.1 45.2 45.'t 45.3 45.4 45.5 45.5 45.5 45.5 45.5 45.5 45.5 45.6 45.6 45.6 45.6 45.6 45.6 45.6 45.7 45.7 45.4 6

45.7 45.7 45.7 45.8 45.8 45.8 45.8 45.8 45.8 45.8 45.7 45.8 45.7 45.8 45.8 45.9 45.9 45.7 45.6 45.5 45.5 45.3 45.1 44.9 45.7 7

44.7 44.6 44.6 44.5 44.4 44.2 44.1 44.1 44.1 44.2 44.4 44.5 44.7 44.8 45.0 45.0 45.1 45.1 45.2 45.1 45.1 45.0 45.0 45.0 44.7 8

44.9 44.8 44.7 44.7 44.6 44.5 44.4 44.3 44.3 44.3 44.3 44.5 44.6 44.9 45.1 45.3 45.5 45.6 45.7 45.9 45.9 45.9 45.8 45.8 45.0 rJ 9

45.9 45.9 45.9 45.9 45.9 45.8 45.9 46.0 4.1 46.3 u.5 46.6 46.6 46.6 46.5 4.3 4.3 46.3 46.4 4.4 46.4 46.4 4.4 4.4 46.2 f

10 4.3 46.2 46.1 46.2 46.2 46.2 46.2 46.3 46.5 4.7 %.9 47.1 47.4 47.6 47.8 47.9 47.8 47.8 47.7 47.6 47.4 47.4 47.3 47.3 47.0 11 47.3 47.2 47.2 47.1 47.0 47.0 47.0 47.0 47.1 47.2 47.4 47.4 47.4 47.4 47.4 47.4 47.4 47.4 47.3 47.3 47.1 47.0 47.0 47.0 47.2 12 47.1 47.1 46.9 46.9 M.9 46.8 46.7 46.6 M.6 u.7 46.9 47.1 47.3 47.5 47.6 47.8 47.8 47.8 47.7 47.6 47.5 47.5 47.4 47.3 47.2 13 47.3 47.2 47.1 46.9 46.8 46.7 46.6 46.5 46.5 46.8 47.1 47.3 47.7 47.9 48.1 48.2 48.3 48.1 48.0 47.8 47.7 47.5 47.5 47.5 47.4 14 47.5 47.5 47.5 47.3 47.2 47.2 47.1 47.1 47.0 47.I 47.2 47.4 47.4 47.3 47.2 47.3 47.3 47.3 47.2 47.1 4.9 46.7 46.4 4.2 47.1 IS 46.0 45.9 45.7 45.6 45.5 45.5 45.4 45.3 45.2 45.2 45.4 45.5 45.7 45.8 46.0 46.2 4.3 4.3 4.2 46.1 45.9 45.9 45.9 45.8 45.8 16 45.8 45.7 45.6 45.5 45.3 45.2 45.1 45.0 45.0 45.0 45.1 45.1 45.2 45.5 45.7 45.7 45.6 45.5 45.2 45.1 44.9 44.7 44.7 44.7 45.2 17 44.7 44.6 44.6 44.6 44.6 44.6 44.6 44.6 44.7 44.8 45.0 45.1 45.3 45.5 45.7 45.9 46.0 46.0 45.8 45.8 45.8 45.7 45.6 45.4 45.2 18 45.4 45.4 45.3 45.1 45.1 45.1 45.1 45.3 45.5 45.6 45.8 46.0 46.1 u.3 46.5 46.7 46.7 4.8 47.0 47,3 47.3 47.2 47.2 47.2 4.1 19 47.0 %.9 4.7 46.7 u.7 46.7 4.5 46.7 47.0 47.I 47.2 47.5 47.6 47.7 47.8 47.7 47.7 47.6 47.5 47.3 47.0 46.9 46.8 46.7 47.I 20 46.6 46.6 4.7 %.7 46.7 46.8 4.8 46.7 46.7 46.8 46.9 47.1 47.2 47.4 47.6 47.8 48.0 47.9 47.6 47.5 47.4 47.2 47.0 4.9 47.1 21 46.9 4.8 %.8 4.8 46.7 46.6 46.5 4.4 4.5 46.6 M.7 47.0 47.5 47.9 48.1 47.9 47.5 47.7 47.5 47.1 46.7 M.4 46.3 4.2 47.0 22 45.8 45.6 45.4 4%.3 45.3 45 2 45.2 45.5 46.0 %.4 46.6 46.7 46.7 46.7 46.6 46.6 46.4 4.1 4.2 46.1 45.8 45.7 45.6 45.6 46.0 23 45.5 45.4 45.2 45.1 45.0 44.9 44.9 45.0 45.2 45.4 45.7 45.7 45.7 45.8 45.6 45.6 45.6 45.6 45.5 45.4 45.4 45.3 45.3 45.2 45.4 24 45.0 44.8 44.8 44.8 44.9 44.8 44.8 45.1 45.3 45.6 45.7 45.9 46.0 46.1 46.3 4.5 46.6 46.6 46.5 4.4 46.4 4.3 46.2 46.2 45.7 25 46.3 M.3 46.3 M.4 46.5 4.6 M.6 46.5 46.5 46.6 46.6 46.5 46.5 46.4 46.2 46.0 45.7 45.5 45.4 45.4 45.4 45.4 45.3 45.3 46.1 26 45.3 45.2 45.2 45.I 45.1 45.2 45.2 45.4 45.5 45.7 45.9 4.0 46.0 4.1 4.2 4.2 46.4 4.4 4.3 4.1 46.0 45.9 45.8 45.7 27 45.8 45.9 45.9 4.0 46.0 46.0 46.0 4.0 4.1 4.3 46.6 46.8 47.1 47.3 47.6 47.8 47.7 47.6 47.6 47.5 47.5 47.4 47.4 47.4 46.8 28 47.4 47.4 47.5 47.5 47.7 47.7 47.7 47.7 47.9 48.1 48.3 48.5 48.7 48.9 49.I 49.2 49.3 49.3 49.3 49.3 49.2 49.I 49.1 49.0 48.5 29 49.0 48.8 48.7 48.6 48.5 48.5 48.5 48.4 48.4 48.4 48.4 48.5 48.5 48.% 48.6 48.7 49.I 49.2 49.3 49.3 49.3 49.4 49.7 50.0 48.8 30 50.0 49.9 49.9 49.9 49.9 50.0 50.0 50.0 50.0 50.2 50.3 50.5 50.7 50.9 51.0 St.1 51.6 51.6 51.6 51.8 51.6 51.7 St.6 51.7 50.7 MONTHLY AVERACE 46.2

TABLE 3.1-5 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE STATION No. 3 MAY 1981 DAILY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

to Il 12 13 I4 15 16 17 18 19 20 21 22 23 24 1

51.6 $1.7 51.8 51.7 51.9 $1.7 51.8 51.9 5t.7 52.0 52.3 52.6 52.8 53.0 53.3 53.4 53.6 53.6 53.6 53.5 53.3 53.3 53.3 53.3 52.6 2

53.2 53.3 53.2 53.2 53.2 53.3 53.1 53.2 53.1 53.2 53.4 53.6 53.6 53.7-53.8 %.2 %.6 %.7 %.8 54.9 54.5 %.5 54.4 %.3

",3.8 3

%.0 %.0 53.8 53.8 53.6 53.8 53.6 53.5 53.6 53.6 53.8 53.9 %.4 55.I 55.9 56.5 %.8 57.0 57.2 %.7 56.7 %.5 %.I 55.9 55.0 4

55.9 55.4 55.2 55.0 %.9 54.8 %.6

%.5 54.3 54.5 %.6 54.7 54.8 54.9 55.0 55.2 55.4 55.2 55.1 55.0 54.8 %.7 54.6 54.6 54.9 5

%.6 %.7 %.7 %.9 54.9 55.0 $5.1 55.8 55.1 55.0 55.8 55.2 55.4 55.5 55.7 55.9 56.I 56.2 56.2 %.2 56.1 56.2 %.2 56.2 55.5 6

56.2 %.2 %.I %.I 56.0 55.9 55.8 55.7 55.7 55.7 55.8 56.0 %.3 56.7 %.9 57.0 57.3 57.4 57.6 57.6 57.6 57.5 57.3 57.2

%.6 7

57.0 56.9 56.9 56.6 %.5 56.5 %.3 55.9 55.8 55.9 55.8 55.8 56.2 56.7 56.8 57.0 57.2 57.3 57.3 57.3 57.1 57.0 56.9 56.8 56.6 8

%.7 %.7 %.7 56.8 56.7 %.6 56.4 56.2 %.I %.0 56.1 56.4 56.8 57.0 57.1 57.3 57.5 57.5 57.4 57.4 57.4 57.5 57.7 58.0 56.9 9

58.1 58.0 58.1 58.1 58.1 58.1 58.2 58.4 59.0 59.8 59.4 58.5 58.0 57.9 57.9 58.1 58.3 58.5 58.8 58.8 58.8 58.5 58.0 58.1 58.4 10 58.4 58.4 58.2 58.3 58.5 58.8 58.8 58.9 59.3 59.6 60.4 60.6 60.1 59.6 58.8 58.2 57.8 57.9 57.9 58.0 58.1 58.2 58.3 58.3 58.7 h

11 58.5 58.6 58.6 58.7 58.9 59.3 59.6 59.9 60.3 60.6 59.1 58.0 56.9 56.4 56.3 %.2 56.3 56.4 56.6 56.8 56.9 57.0 57.2 57.2 57.9 Co 12 57.2 57.2 57.I 57.0 57.0 57.0 57.1 57.2 57.2 57.2 57.2 57.3 57.4 57.5 57.6 57.6 57.7 57.7 57.7 57.8 57.9 57.9 58.0 58.0 57.4 1

13 58.0 57.9 57.8 57.8 57.9 57.8 57.7 57.7 57.9 58.0 58.1 58.2 58.4 58.6 58.8 58.8 58.7 58.6 58.4 58.4 58.3 58.1 57.9 57.8 58.2 14 57.7 57.6 5'7.5 57.3 57.2 57.1 57.0 56.9 56.8 56.8 56.9 57.0 57.2 57.5 57.7 57.9 58.0 58.1 58.2 58.1 58.1 58.0 57.9 57.8 57.5 15 57.8 57.7 57.6 57.6 57.6 57.6 57.6 57.6 57.6 57.6 57.7 57.8 57.9 58.0 57.9 57.6 57.3 57.2 57.1 57.1 57.1 57.8 57.1 57.0 57.5 16 57.0 57.0 57.0 57.0 57.0 57.0 56.9 57.0 57.0 %.9 56.9 56.8 56.8 56.8 56.7 %6 56.5 %.4 56.3 56.3 56.2

%. ! %.0

%.0

%.7 17 55.9 55.8 55.7 55.7 55.6 55.6 55.6 55.6 55.6 55.6 55.7 55.8 55.9 56.0 56.1 56.2 56.3 56.3 56.4 56.3 %.2 %.2 56.1 %.I 55.9 18 56.1 %.0 %.0 %.0 %.0 %.0 56.0 %.0 56.1 56.2 %.3 %.4 56.5 %.6 56.7 56.7 %.7 56.7 %.6 56.5 %.3 56.2 %.1 56.0 56.3 19

%.0 %.0 55.9 55.9 55.8 55.7 55.7 55.8 55.8 55.9 56.1 56.3 %.5 56.7 56.8 %.9 56.8 56.7 56.6 56.4 56.2 56.0 55.9 55.8 56.2 20 55.7 55.6 55.5 55.4 55.4 55.3 55.3 55.4 55.5 55.6 55.9 %.2 56.5 56.8 57.1 57.3 57.4 57.5 57.4 57.3 57.1 %.9 56.8 56.5

%.3 21 56.4 %.3 56.1 %.0 55.9 55.7 55.7 55.6 55.7 55.7 56.0 56.2 %.6 57.0 57.3 57.4 57.6 57.7 57.7 57.7 57.6 57.4 57.3 57.2

%.7 22 57.0 %.9 %.8 %.7 56.6 56.6 %.5 %.4 %4 56.4 %.5 56.7 56.9 57.1 57.4 57.6 57.7 57.8 57.9 57.9 57.7 57.5 57.4 57.4 57.1 23 57.3 57.2 57.2 57.2 57.2 57.2 57.2 57.2 57.1 57.1 57.2 57.4 57.7 58.0 58.4 58.8 58.8 58.9 59.0 58.9 58.8 58.7 58.5 58.4 57.9 i

24 58.1 $7.9 57.7 57.7 57.9 57.9 57.9 57.6 57.4 57.4 57.7 57.9 58.3 58.7 59.4 60.1 60,1 59.9 59.9 59.8 59.8 59.6 59.6 59.7 58.7

)

25 59.9 59.9 59.8 59.7 59.7 59.7 59.6 59.7 59.8 60.0 59.7 59.6 59.9 60.4 61.3 61.9 61.2 60.7 60.9 61.1 61.0 60.8 60.7 60.9 60.3 26 61.2 61.2 61.1 61.1 61.1 61.1 61.1 60.7 60.5 60.8 61.0 61.3 61.9 62.3 62.3 63.1 63.6 63.4 63.2 63.5 63.3 6I.2 63.0 62.8 62.0 27 62.7 62.6 62.7 62.9 63.4 63.5 63.7 63.0 62.7 62.8 62.9 63.1 63.3 63.4 63.5 63.6 63.8 64.1 64.2 64.4 64.5 64.5 u.5 64.6 63.5 l

28 64.6 64.5 M.4 64.3 64.3 64.2 M.2 64.3 M.3 64.4 64.5 64.7 64.8 65.0 65.1 65.2 65.3 65.4 65.4 65.5 65.5 65.5 65.6 65.6 M.9 l

29 65.9 66.4 66.5 66.6 66.9 67.1 67.4 66.2 65.8 65.9 66.0 66.0 66.1 %.3 66.5 66.6 66.7 66.7 66.7 66.7 66.5 %.3 M.2 %I 66.4 30 65.9 66.1 66.6 66.6 66.6 66.7 66.8 M.9 67.0 66.6 66.2 66.2 66.4 66.6 66.7 66.8 66.9 67.0 67.4 67.7 67.6 67.4 67.4 67.2 66.8 31 67.2 67.2 67.2 67.2 67.2 67.2 67.2 67.3 67.3 67.1 66.9 66.9 67.1 67.4 67.6 67.4 67.3 67.2 M.9 66.8 66.7 66.6 66.5 %.5 67.1 MONTHLY AVERAct 58.4 l

l l

E E

E

TABLE 3.1-6 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE STATION NO. 3 JUPE 1981 e

DAILY DAY HOUR AVERACE t

2 3

4 5

6 7

8 9

10 Il 12 13 14 15 16 17 18 19 20 21 22 23 24 I

M.4 66.5 66.5 M.5 M.5 66.5 66.5 66.4 M.3 M.4 66.5 M.7 M.8 67.0 67.2 67.4 67.5 67.5 67.5 67.4 67.3 67.2 67.1 67.0 M.9 2

67.8 67.1 67.3 67.2 67.2 67.1 67.1 66.9 66.8 M.7 66.6 66.5 M.6 M.5 M.6 66.6 M.7 66.7 66.6 M.6 66.4 66.3 M.2 M.1 66.7 3

66.1 66.0 M.0 M.0 66.1 M.I 66.2 66.3 66.4 M.5 M.5 66.5 66.5 66.5 66.5 66.4 66.3 66.2 66.1 M.1 66.1 66.1 M. I 66.1 66.2 4

66.1 M.1 M.1 66.1 M.I 66.1 65.9 65.8 65.8 65.8 65.8 65.9 66.0 M0 M.I 66.2 M2 M.2 M.2 66.1 M.0 65.9 65.8 65.7 66.0 5

65.7 65.6 65.6 65.5 65.5 65.4 65.4 65.3 65.3 65.3 65.5 65.7 65.9 66.2 66.5 M.7 66.8 66.9 M.9 66.8 M.6 66.1 66.2 M.!

66.0 6

65.9 65.9 65.9 65.9 65.9 65.9 65.9 65.9 66.0 66.0 66.1 66.3 66.4 66.7 67.0 67.5 67.2 67.2 67.2 67.1 67.0 M.8 66.7 66.6 M.4 7

66.5 66.5 66.4 66.4 M.3 66.3 66.3 66.4 66.5 M.7 66.9 67.1 67.3 67.6 67.9 68.2 68.5 68.6 68.6 68.5 68.3 68.1 67.9 67.7 67.1 8

67.5 67.3 67.2 67.2 67.1 67.1 67.2 67.2 67.3 67.4 67.6 67.9 68.3 68.7 69.0 69.2 69.4 69.3 6t.3 69.1 68.8 68.5 68.1 68.1 68.1 9

68.0 68.0 67.9 67.9 67.8 67.8 67.9 67.9 68.0 68.0 68.0 67.9 67.9 67.9 68.0 68.0 67.9 67.9 67.8 67.7 67.6 67.4 67.3 67.2 67.8 10 67.1 67.2 67.2 67.2 67.3 67.3 67.2 67.1 67.1 67.1 67.2 67.3 67.4 67.6 67.7 67.8 67.8 67.7 67.7 67.7 67.6 67.6 67.5 67.5 67.4 I

11 67.4 67.3 67.2 67.1 67.0 66.8 M.6 66.5 66.4 66.4 M.5 66.6 66.8 67.0 67.2 67.4 67.5 67.6 67.7 67.7 67.7 67.6 67.5 67.4 67.1 N

82 67.3 67.3 67.1 67.0 M8 66.7 M.5 M.4 M.4 66.4 66.5 66.7 66.9 67.1 67.4 67.6 67.7 67.7 67.7 67.6 67.6 67.5 67.4 67.4 67.1 y

13 67.4 67.4 67.3 67.3 67.3 67.3 67.2 67.1 67.1 67.I 67.3 67.5 67.7 67.9 68.2 68.4 68.5 68.5 68.6 68.5 68.4 68.2 68.1 67.9 67.8 14 67.8 67.7 67.6 67.6 67.5 67.4 67.3 67.2 67.I 67.0 67.0 66.9 66.9 M.9 M9 66.9 66.8 M.8 66.7 66.7 66.7 66.7 66.7 M.7 67.1 15 6'r. 7 M.7 66.7 66.6 M.6 M.5 M.4 M.3 66.2 66.2 66.2 M3 66.3 66.5 66.7 67.0 67.2 67.3 67.3 67.2 67.2 67.1 67.1 67.1 66.7 16 67.2 67.6 67.7 67.4 67.2 67.1 67.1 67.0 M.8 66.7 66.9 67.1 67.4 67.7 68.0 68.2 68.1 68.6 68.7 68.7 68.6 68.6 68.6 68.6 67.7 17 68.8 69.2 69.5 69.6 69.6 69.6 69.6 69.3 69.2 69.2 69.3 69.3 69.6 69.8 70.1 70.2 70.4 70.4 70.4 70.2 69.9 69.6 69.4 69.1 69.6 18 69.0 69.0 69.2 69.2 69.0 69.0 69.0 68.8 68.8 68.9 69.2 69.6 70.0 70.4 70.7 70.8 70.9 71.0 70.7 70.9 71.3 71.4 71.4 71.2 70.0 19 71.2 71.0 71.0 70.8 70.7 70.7 70.6 70.6 70.1 69.7 69.8 70.1 70.4 70.9 71.2 71.5 71.7 71.9 72.0 72.1 72.3 72.5 72.6 72.7 71.2 l

20 72.4 72.3 72.2 72.1 72.1 72.1 72.1 72.2 72.2 71.7 71.5 71.5 71.5 71.7 72.2 72.3 72.2 72.2 72.2 72.2 72.2 72.2 72.3 72.2 72.1 21 72.2 72.3 72.4 72.3 72.2 72.2 72.4 72.4 72.9 73.0 73.1 73.2 72.6 72.2 72.3 72.6 73.0 73.2 73.2 73.3 73.2 73.1 73.1 73.1 72.'

22 73.4 73.7 73.7 73.8 73.9 73.8 73.8 73.8 73.5 73.2 73.I 72.8 72.8 72.8 72.7 72.5 72.4 72.5 72.5 72.5 72.5 72.5 72.5 72.4 73.0 23 72.3 72.2 72.1 71.9 71.7 71.6 73.3 71.2 71.3 71.3 71.5 71.7 71.7 71.7 71.7 71.8 71.7 71.8 72.0 72.3 72.0 71.8 71.7 71.8 71.8 24 72.2 72.5 72.5 72.5 72.4 72.3 71.9 71.5 70.9 70.8 70.8 71.0 71.1 71.4 71.5 71.7 71.8 71.9 72.0 72.2 72.0 71.8 71.7 71.8 71.8 25 72.4 72.6 72.4 72.2 72.2 72.2 72.5 71.9 71.4 78.3 71.2 71.6 71.3 71.2 71.1 71.2 71.5 71.5 71.5 71.3 78.3 71.3 71.3 71.4 71.7 26 71.7 71.9 71.8 71.7 71.6 71.5 71.5 71.2 71.0 70.7 7').6 70.8 70.8 70.8 70.7 70.6 70.7 70.7 70.5 70.5 70.4 70.4 70.3 70.1 70.9

)

27 70.1 70.0 69.9 69.8 69.6 69.4 69.3 69.1 69.0 68.9 69.0 69.1 69.3 69.4 69.7 69.9 70.0 70.I 70.0 69.8 69.8 69.6 69.4 69.1 69.6 28 69.3 69.3 69.2 69.3 69.3 69.0 69.3 69.4 69.7 69.8 69.6 69.4 69.3 69.5 70.1 70.7 71.0 71.3 71.4 71.4 71.4 71.2 70.9 71.1 70.1 29 71.3 71.3 71.0 70.9 70.8 70.7 70.7 70.5 70.3 70.5 70.5 70.3 70.2 70.3 70.5 71.0 71.3 71.6 71.5 71.4 71.2 71.4 71.9 72.2 71.0 30 12.2 72.1 72.0 71.8 71.8 71.7 71.6 71.4 71.5 71.5 71.4 75.*

71.7 71.9 72.2 72.2 72.1 72.3 72.5 72.4 72.2 72.0 72.0 72.0 71.9 MONTHLY AVERACE 69.0

TABLE 3.1-7 AVERACE HOURLY TEMPERAT' IRE IN *F VERMONT YANKEE SAMPLE STATION No. 3 JULY 1981 DAILY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

to Il 12 13 14 15 16 17 18 19 20 21 22 23 24 1

72.2 72.4 72.4 72.4 72.6 72.7 72.7 72.6 72.6 72.5 72.6 72.7 72.8 73.0 73.1 73.3 73.3 73.3 73.4 73.6 73.9 73.7 73.4 73.3 72.9 2

73.3 73.4 73.5 73.4 73.4 73.7 73.5 73.5 73.3 73.3 73.4 73.4 73.5 73.6 73.8 74.0 74.1 74.1 74.3 74.4 74.4 74.2 74.I 74.0 73.7 3

73.9 74.0 73.9 73.9 73.9 74.0 73.9 74.0 74.0 73.9 73.9 73.8 73.7 73.9 74.2 74.2 74.1 74.1 74.2 74.1 73.9 73.7 73.9 74.0 74.0 4

74.0 73.9 74.0 74.0 74.0 73.9 73.9 74.0 74.1 74.1 74.1 74.2 74.2 74.3 74.4 74.6 74.6 74.6 74.7 76.3 75.9 75.2 75.7 76.8 74.6

)

76.7 76.4 76.6 76.9 77.0 77.2 77.5 78.1 78.8 79.0 77.6 76.5 76.0 76.0 76.7 78.2 78.3 78.0 78.1 76.9 76.4 76.5 76.7 76.2 77.2 6

76.1 76.6 78.0 78.1 77.6 77.5 77.5 77.5 71.1 76.5 76.3 76.2 76.3 76.4 76.5 76.7 77.0 77.2 77.4 77.6 77.3 77.1 77.3 77.4 77.0 7

77.7 78.2 78.5 78.6 79.0 79.9 80.0 81.5 79.2 77.7 77.2 77.4 77.9 77.8 77.8 77.1 76.0 76.1 76.2 76.3 76.4 76.2 76.1 76.2 77.7 8

76.2 76.3 76.2 76.1 76.1 76.0 75.8 75.7 75.6 75.5 75.6 75.7 75.9 76.2 76.5 76.8 76.9 77.0 77.0 77.0 76.9 76.8 76.6 76.6 76.3 9

76.7 76.9 76.8 76.7 76.7 76.8 77.1 77.2 76.7 76.6 76.9 77.1 77.3 77.6 77.9 78.2 78.4 78.5 78.5 78.7 78.8 78.7 78.7 78.6 77.6 10 78.6 78.6 74.5 78.5 78.5 78.5 78.3

,d 3 78.3 78.4 78.5 78.5 78.4 78.7 79.1 79.4 79.7 79.9 79.9 79.8 79.9 79.8 79.7 79.6 79.0 Il 79.4 79.4 79.3 79.2 79.1 79.0 79.0 79.0 79.2 79.5 79.8 79.5 79.1 79.2 79.9 80.5 80.9 80.9 80.8 80.7 80.6 80.4 80.2 80.0 79.8 g

b) 12 80.1 80.0 79.9 79.9 79.8 79.6 79.7 79.9 80.0 80.1 80.3 80.6 80.8 80.9 81.2 81.3 81,4 81.1 80.7 80.4 79.5 79.0 79.2 79.5 80.2 C) 13 79.6 79.6 79.6 79.5 79.6 79.7 79.8 79.8 79.8 79.2 79.1 79.0 79.0 79.0 79.1 79.2 79.3 79.2 79.3 79.3 79.2 79.2 79.2 79.2 79.4 I

14 79.2 79.1 79.0 79.1 79.0 79.0 78.9 78.9 79.0 78.8 78.7 78.7 78.6 78.6 71.6 78.6 78.7 78.8 78.9 78.9 78.8 78.7 78.6 78.6 78.8 15 78.4 78.3 78.1 78.0 77.9 77.7 77.6 77.6 77.7 77.9 77.6 77.4 77.6 77.8 78.0 78.2 78.4 78.7 79.0 78.9 78.7 78.6 78.5 78.4 78.1 16 78.3 78.1 78.0 77.9 77.7 77.6 77.4 77.4 77.4 77.8 78.2 78.1 77.9 78.0 78.2 78.6 78.9 79.1 79.1 79.0 78.9 79.8 78.7 78.6 78.2 17 78.5 78.4 78.3 78.2 78.0 78.0 77.8 77.8 77.9 78.1 78.4 78.8 78.8 78.8 78.6 79.0 79.1 79.1 79.0 78.8 78.5 78.3 78.2 78.1 78.4 18 78.1 78.1 78.0 78.0 78.1 78.1 78.1 78.1 78.3 78.5 78.7 78.9 79.2 79.4 79.3 79.3 79.0 78.7 78.4 78.7 78.7 78.6 78.5 78.4 78.6 19 78.3 78.3 78.2 78.1 78.1 78.0 77.9 77.9 77.8 77.8 78.0 78.4 78.9 79.0 79.2 79.0 79.0 78.8 78.7 78.4 78.1 77.9 77.3 77.7 78.3 20 77.5 77.4 77.4 77.3 77.3 77.3 77.4 77.5 77.5 77.4 77.4 77.6 77.6 77.6 77.5 77.5 77.4 77.4 77.3 77.2 77.1 77.3 77.4 77.5 77.4 21 77.5 77.4 77.4 77.3 77.2 77.2 77.2 77.2 77.0 76.9 77.0 77.2 77.4 77.5 77.7 77.9 78.3 78.2 78.3 78.2 78.2 78.2 78.2 78.1 77.6 22 78.1 78.0 77.9 77.9 77.9 77.8 77.8 77.8 77.8 77.7 77.6 77.5 77.5 77.6 77.4 77.5 77.5 77.4 77.3 77.3 77.3 77.2 77.1 77.0 77.6 23 76.8 76.8 76.6 76.5 76.3 76.2 76.2 76.1 76.2 76.4 76.6 76.5 76.7 76.8 77.0 17.2 77.4 77.4 77.5 77.4 77.2 77.1 77.0 76.9 76.8 l

24 76.7 76.5 76.4 76.3 76.2 76.0 76.0 75.9 75.9 76.1 76.1 76.1 76.1 76.2 76.4 76.6 76.8 77.0 77.0 76.9 76.7 76.6 76.3 76.1 76.4 l

25 75.9 75.8 75.7 75.6 75.5 75.4 75.4 75.5 75.6 75.8 76.1 76.4 76.7 77.0 77.4 77.5 77.5 77.0 76.4 76.0 75.5 75.5 75.5 75.5 76.1 26 75.5 75.4 75.4 75.3 75.3 75.3 75.3 75.4 75.5 75.6 75.8 76.0 76.1 76.1 76.3 76.3 76.2 76.1 75.9 75.8 75.7 75.5 75.5 75.4 75.7 27 75.4 75.4 75.5 75.4 75.5 75.6 75.6 75.6 75.4 75.4 75.5 75.7 75.8 76.0 76.1 76.3 76.4 76.4 76.3 76.2 76.1 76.0 76.0 76.0 75.8 28 75.9 75.7 75.6 75.5 75.4 75.4 75.3 75.3 75.3 75.3 75.4 75.4 75.6 75.7 75.7 75.7 75.7 75.7 75.8 75.8 75.7 75.7 75.7 75.8 75.6 29 75.6 75.6 75.5 75.6 75.6 75.6 75.5 75.6 75.5 75.4 75.3 75.3 75.3 75.3 75.3 75.4 75.6 75.6 75.6 75.5 75.3 75.1 75.0 74.8 75.4 30 74.6 74.6 74.5 74.3 74.1 74.0 73.9 73.8 73.7 73.6 73.7 73.9 76.2 74.4 74.6 74.8 74.9 75.0 75.0 E.9 74.7 74.4 74.2 74.0 74.3 31 73.8 73.6 73.4 73.3 73.1 73.0 72.9 72.7 72.6 72.7 72.9 73.1 73.4 73.8 74.1 74.5 74.8 74.9 74.9 74.8 74.6 74.3 74.1 73.9 73.7 l

MONTHLY AVERACE 76.8 I

1

[

M M

TABLE 3.1-8 AYERACE HOUBLY TEMPERATURE IN *F VERMONT YANKEE S4MPLE STATION NO. 3 AUCUST 1981 DAILY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

10 Il 12 13 14 15 16 17 18 19 20 21 22 23 24 I

73.8 73.8 73.7 73.6 73.5 73.5 73.4 73.4 73.4 73.4 73.5 73.6 73.8 74.0 74.2 74.6 74.9 75.1 75.1 75.0 74.9 75.1 75.2 75.2 74.2 2

75.2 75.1 75.0 74.9 74.8 74.6 74.5 74.5 74.5 74.6 74.9 75.2 75.4 75.9 75.9 75.8 75.6 75.6 75.3 75.0 74.7 74.9 75.1 75.2 75.1 3

75.3 75.2 75.0 74.8 74.6 74.4 74.4 74.5 74.4 74.2 74.3 74.7 74.9 75.0 75.1 75.2 75.3 75.2 75.2 75.1 75.0 75.0 75.0 75.0 74.9 4

75.0 75.0 74.9 74.8 74.7 74.6 74.6 74.6 74.7 74.9 75.1 75.3 75.5 75.7 75.9 76.1 76.3 76.3 76.2 76.1 75.9 75.8 75.8 75.7 75.4 5

75.7 75.7 75.5 75.3 75.1 75.0 75.0 75.0 75.0 75.0 75.0 75.3 75.5 75.6 75.5 75.5 75.5 75.4 75.4 75.2 75.2 75.2 75.3 75.2 75.3 6

75.3 75.2 75.1 74.9 74.9 74.8 74.8 74.8 74.7 74.7 74.6 74.5 74.6 74.7 75.0 75.0 75.2 75.3 75.4 75.4 75.4 75.3 75.2 75.0 75.0 7

74.9 74.8 74.8 74.7 74.6 74.5 74.6 74.5 74.5 74.5 74.6 74.8 75.1 75.4 75.7 76.1 76.1 76.2 76.3 76.2 76.t 76.0 76.0 75.9 75.3 8

75.8 75.8 75.8 75.7 75.6 75.5 75.5 75.4 75.3 75.0 74.9 74.9 75.0 75.0 75.3 75.4 75.5 75.5 75.4 75.3 75.3 75.3 75.4 75.4 75.4 9

75.4 75.4 75.4 75.4 75.3 75.3 75.3 75.2 74.9 74.9 74.9 74.9 74.9 75.1 75.3 75.6 75.8 75.9 75.8 75.8 75.8 75.7 75.7 75.7 75.4 10 75.7 75.8 75.7 75.7 75.7 75.6 75.6 75.5 75.4 75.4 75.5 75.6 75.6 75.7 75.8 75.9 76.1 76.2 76.2 76.1 75.8 75.7 75.5 75.3 75.7 g

11 75.2 75.3 75.3 75.2 75.1 75.1 75.0 74.8 74.7 74.7 74.8 74.8 74.9 74.9 75.0 75.0 75.0 75.0 74.9 74.9 74.7 74.6 74.6 74.7 74.9 LJ 12 74.7 74.7 74.9 74.9 74.9 74.8 74.8 74.7 74.7 74.7 74.9 75.0 75.0 75.2 75.3 75.5 75.8 75.9 76.0 75.9 75.8 75.7 75.6 75.4 75.2 13 75.3 75.6 75.8 75.7 75.6 75.6 75.5 75.1 74.8 74.9 74.9 75.0 75.2 75.3 75.5 75.6 75.7 75.7 75.8 75.9 76.0 76.0 76.1 76.1 75.5 14 76.2 76.3 76.3 76.1 76.1 75.9 75.9 75.5 75.4 75.3 75.4 75.5 75.7 75.9 76.1 76.4 76.5 76.6 76.5 76.4 76.4 76.3 76.3 76.5 76.1 15 76.5 76.5 76.4 76.4 76.4 76.4 76.4 76.4 76.4 76.2 76.0 75.9 75.7 75.7 75.6 75.5 75.4 75.3 75.2 75.0 74.9 7. 3 74.7 74.7 75.8 16 74.7 74.9 74.9 74.8 74.9 74.9 74.9 74.9 74.6 74.4 74.4 74.4 74.5 74.6 74.6 74.6 74.4 74.5 74.5 74.5 74.3 74.2 74.0 73.7 74.5 17 73.2 72.8 72.4 72.2 72.0 71.8 71.7 71.6 71.6 71.5 71.5 71.5 71.4 71.4 71.5 71.6 71.8 71.7 71.5 71.5 71.4 71.2 71.2 71.0 71.7 18 70.9 70.6 70.4 70.1 70.0 69.8 69.7 69.6 69.5 69.5 69.5 69.8 69.9 69.9 70,0 70.1 70.0 69.9 69.7 69.4 69.1 68.9 68.6 68.4 69.7 19 68.2 68.0 67.9 67.7 67.7 67.6 67.5 67.5 67.7 67.7 67.9 68.1 68.3 68.5 68.6 68.8 68.8 68.6 68.5 68.3 68.1 67.9 67.8 67.6 68.1 20 67.5 67.3 67.2 67.1 66.9 66.8 66.8 66.7 66.8 66.9 67.1 67.4 67.7 67.9 68.1 68.4 68.4 68.4 68.3 68.2 67.9 67.6 67.4 67.2 67.5 21 67.0 66.9 66.7 66.6 66.5 66.4 66.2 66.1 66.1 66.1 66.2 66.4 66.6 66.8 67.1 67.4 67.6 67.7 67.8 67.9 67.9 67.S 67.7 67.5 67.0 22 67.3 67.1 67.0 66.8 66.7 66.6 66.5 66.5 66.5 66.6 66.7 66.8 66.9 67.1 67.2 67.3 67.4 67.5 67.6 67.7 67.9 67.8 67.9 e5.0 67.1 23 68.1 68.3 68.2 68.2 68.2 68.2 68.2 68.3 68.6 68.8 69.4 69.9 70.2 70.8 70.9 71.0 71.0 70.9 70.6 69.3 68.9 69.1 69.3 a9.3 69.3 24 69.6 69.7 69.6 69.5 69.5 69.5 69.4 69.1 68.6 68.6 68.7 68.6 68.5 68.7 68.8 68.8 68.8 68.6 68.5 68.5 68.6 68.5 68.5 68.6 68.9 25 68.6 68.8 69.0 69.0 69.0 69.1 69.0 68.7 68.5 68.7 68.7 68.9 69.0 69.0 69.2 69.3 69.3 69.4 69.5 69.4 69.4 69.3 69.1 69.2 69.0 26 69.2 69.2 69.2 69.2 69.2 68.9 69.2 69.2 69.1 69.0 69.0 69.1 69.3 69.5 69.7 69.9 70.1 70.1 70.0 69.9 69.8 69.6 69.6 69.5 69.4 27 69.5 69.6 69.9 70,0 69.9 69.9 70.0 70.1 70.2 70.2 69.7 69.6 69.8 69.9 70.1 70.1 70.1 70.2 70.3 70.3 70.2 70.2 70.3 70.3 70.0 28 70.2 70.1 70.1 70.0 70.0 70.0 69.9 69.7 69.4 69.3 69.4 69.6 69.6 69.9 70.1 70.3 70.5 70.5 70.5 70.6 70.4 70.2 70.1 70.0 70.0 29 70.1 70.1 70.0 70.0 69.9 69.9 69.9 70.0 70.0 70.2 70.1 70.0 70.3 70.8 71.1 71.0 71.0 70.9 70.7 70.6 70.3 70.3 70.2 70.2 70.3 30 70.1 70.1 70.1 70.0 70.1 70.2 70.2 70.4 70.6 70.7 70.7 70.7 70.7 70.7 70.8 70.7 70.7 70.7 70.6 70.0 69.6 69.6 69.8 70.3 70.3 31 70.4 70.3 70.3 70.3 70.4 70.4 70.4 70.5 70.6 70.6 70.3 70.1 70.1 70.2 70.2 70.2 70.1 70.2 70.3 70.4 70.2 70.1 70.1 70.0 70.3 MONTHLY AVERACE 72.3

TABLE 3.1-9 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE STATION NO. 3 SEPTEMBER 1981 DAILY DAY HOUR AvtRACE I

2 3

4 5

6 7

8 9

to il 12 13 14 15 16 17 18 19 20 21 22 23 24 1

70.0 70.0 70.0 70.0 70.1 70.1 69.9 69.8 69.8 69.7 69.7 69.8 69.8 69.9 69.9 70.0 70.0 70.0 70.0 70.0 70.2 70.5 70.5 70.5 70.0 2

70.4 70.5 70.5 70.5 70.5 70.4 70.1 69.9 69.7 69.7 69.7 69.7 69.8 69.9 70.0 70.1 70.1 70.I 70.1 70.1 70.0 70,0 70.0 70.3 70.1 3

70.6 70.6 70.4 70.4 70.3 70.4 70.4 70.4 69.8 69.6 69.5 69.5 69.4 69.4 69.4 69.5 69.5 69.5 69.4 69.4 69.3 69.5 70.0 70.2 69.8 4

70.2 70.1 70.1 70.0 70.0 70.0 70.0 70.0 69.3 69.1 69.1 69.1 69.4 70.2 70.6 70.5 70.I 69.9 69.9 69.8 69.8 70.0 70.2 70.1 69.9 5

70.0 70.0 69.9 69.9 69.9 69.8 69.8 69.9 69.9 69.9 69.9 69.7 69.7 70.0 70.4 70.9 71.2 71.3 71.2 70.8 70.7 70.9 71.4 71.4 70.4 6

71.3 7I.3 71.2 71.2 71.1 71.2 71.1 71.I 71.1 71.3 71.5 71.8 72.4 72.2 72.5 72.6 72.5 72.1 72.0 71.6 70.4 70.1 70.3 70.9 71.4 7

71.0 70.9 70.8 70.9 71.0 70.9 70.7 71.0 71.1 70.9 7I.0 71.1 71.1 71.1 70.5 70.4 70.3 70.2 70.1 70.t 69.6 69.5 69.7 70.4 70.6 8

70.6 70.6 70.8 70.8 70.8 70.7 70.7 70.7 70.3 69.6 69.5 69.5 69.6 69.6 69.6 70.1 70.5 70.4 70.2 70,0 69.9 69.6 69.7 69.7 70.2 9

69.6 69.7 69.8 69.8 69.9 69.8 69.7 69.7 69.4 68.9 69.0 69.1 69.1 69.2 69.3 69.3 (9.4 69.4 69.3 69.2 69.2 69.1 69.0 68.8 69.4 10 68.6 68.5 68.8 68.8 68.7 68.6 68.5 68.5 67.8 67.6 67.7 67.8 68,0 68.3 68.5 68.6 68.7 68.7 68.9 69.0 69.0 68.9 68.9 68.9 68.5 11 68.9 68.9 68.8 68.8 68.8 68.8 68.8 68.9 68.9 68.6 68.6 68.7 68.9 68.9 69.0 69.0 69.1 69.1 69.2 69.3 69.2 69.2 69.2 69.1 68.9 h

12 69.0 68.9 68.9 68.8 68.8 68.7 68.7 68.6 68.2 67.9 67.7 67.7 67.8 68.0 68.1 68.2 68.5 68.9 68.8 68.8 68.8 68.8 68.8 68.7 68.5 N

13 68.6 68.6 68.6 68.6 68.6 68.7 68.6 68.7 68.9 69.0 69.2 69.5 69.8 70.1 70.2 70.1 70.0 69.8 69.6 69.4 69.4 69.4 69.5 69.4 69.3 1

14 69.5 69.5 69.4 69 4 69.5 69.5 69.5 69.5 68.8 68.6 68.5 68.5 68.7 68.9 69.0 69.0 68.9 68.9 68.9 68.9 68.9 68.7 68.6 68.6 69.0 15 68.8 68.9 68.8 68.h 68.9 68.8 68.9 69.0 68.5 68.3 68.4 68.4 68.5 68.5 68.7 68.9 69.0 69.1 69.I 69.0 68.9 68.8 68.7 68.6 68.8 16 68.5 68.7 68,9 68.1 68.8 68.8 68.8 68.8 68.4 68.1 68.1 68.0 67.9 67.7 67.8 67.8 67.8 67.8 67.7 67.5 67.4 67.5 67.7 67.7 68.1 17 67.6 67.6 67.5 67.5 67.5 67.5 67.5 67.5 67.2 67.0 66.9 67.0 67.2 68.0 68.4 68.3 68.2 68.1 68.0 68.0 67.9 67.9 67.9 67.8 67.7 18 67.8 67.8 67.7 67.9 67.8 67.8 67.9 68.0 84.0 68.0 68.1 68.2 68.3 68.3 68.3 68.2 68.1 67.9 67.8 67.7 67.6 67.5 67.4 67.4 67.9 19 67.3 67.3 67.3 67.3 67.3 67.4 67.4 67.6 67.7 67.6 67.4 66.9 66.6 66.7 66.8 66.6 66.5 66.5 66.3 66.0 65.9 65.9 65.9 65.9 66.8 20 65.8 65.7 65.7 65.7 65.7 65.7 65.7 65.8 65.7 65.6 65.9 66.2 66.3 66.4 66.8 67.0 67.0 66.6 65.5 65.3 65.4 65.3 65.4 65.6 65.9 21 65.6 65.5 65.5 65.5 65.5 65.5 65.6 65.6 64.8 64.7 64.6 64.6 64.7 64.7 64.7 65.1 65.6 65.6 65.0 65.0 65.1 65.5 65.5 65.4 65,2 22 65.4 65.3 65.3 65.3 65.3 65.3 65.3 65.2 64.8 64.5 64.3 64.I 63.9 63.9 63.8 63.9 64.0 64.1 64.1 64.1 64.0 63.9 63.8 63.6 64.5 23 63.5 63.3 63.3 63.2 63.1 63.1 63.0 62.8 62.7 62.7 62.7 62.6 62.4 62.2 62.2 62.1 61.9 61.7 61.4 61.1 60.9 60.7 60.6 60.6 62.2 24 60.7 60.7 60.7 60.4 60.3 60.2 60.1 60.1 59.8 59.3 58.8 58.3 57.9 57.8 57.7 57.7 57.6 57.5 57.4 57.3 57.2 57.1 56.9 56.8 58.7 I

25 56.7 56.5 56.4 56.2 56.1 55.9 55.7 55.5 55.3 55.2 $5.2 55.3 55.4 55.5 55.7 55.7 55.7 55.8 55.7 55.7 55.6 55.5 55.4 55.3 55.7 j

26 55.3 55.2 55.2 55.3 55.2 55.2 55.1 54.9 54.9 54.8 54.8 54.8 54.9 54.9 55.0 55.2 55.3 55.3 55.4 55.4 55.5 55.4 55.5 55.6 55.2 l

27 55.6 55.6 55.6 55.7 55.7 55.7 55.7 55.7 55.7 55.7 55.7 55.8 56.0 56.1 56.3 56.5 56.6 56.6 56.6 56.7 56.7 56.8 56.9 57.0 56.1 28 57.0 57.0 57.1 58.3 57.2 57.2 57.2 57.3 57.4 57.4 57.5 57.6 57.6 57.7 57.8 58.0 58.1 58.1 58.0 57.8 57.7 57.6 57.5 57.5 57.6 29 57.5 57.5 57.5 57.5 57.4 57.4 57.4 57.4 57.4 57.4 57.6 57.8 57.9 58.1 58.2 58.3 58.3 58.3 58.2 58.1 58.0 58.0 58.0 57.9 57.8 30 57.7 57.6 57.5 57.4 57.3 57.2 57.1 57.0 56.9 57.0 57.I 57.1 57.2 57.3 57.3 57.2 57.1 56.9 56.8 56.6 56.5 56.4 56.3 56.2 57.0 l

MONTHLY AVERACE 65.7 i

I l

TABLE 3.1-10 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE ST4 TION No. 3 OCTOBER 1988 DAILY DAY HOUR AIERACE 1

2 3

4 5

6 7

8 9

to 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1

56.1 %.0 55.9 55.8 55.6 55.6 55.5 55.4 55.4 55.4 55.4 55.3 55.4 55.4 55.3 55.4 55.4 55.3 55.3 55.3 55.2 55.1 55.1 55.0 55.4 2

55.0 54.9 %.8 %.7 %.6 %.5 %.4 %.3 54.3 %.3 54.2 %.2 54.3 54.4 54.6 %.6 54.6 54.5 54.4 54.4 54.3 54.3 54.2 54.2

%.5 3

54.1 54.1 54.1 54.0 53.9 53.8 53.7 53.7 53.7 53.6 53.7 53.7 $3.7 53.7 53.7 53.7 53.7 53.7 53.6 53.5 53.4 53.3 53.2 53.1 53.7 4

53.0 52.9 52.7 52.5 52.4 52.3 52.2 52.2 52.3 52.3 52.4 52.5 52.7 52.9 53.1 53.1 53.2 53.1 53.1 53.0 53.0 $3.0 52.9 52.9 52.7 5

52.8 52.7 52.6 52.6 52.5 52.5 52.5 52.5 52.6 52.6 52.5 52.6 52.6 52.6 52.7 52.7 52.7 52.7 52.8 52.8 52.7 52.7 52.7 52.7 52.6 6

52.6 52.5 52.4 52.3 52.2 52.2 52.1 52.1 52.1 52.1 52.1 52.1 52.1 52.1 52.0 52.0 52.0 51.9 51.9 St.8 51.8 51.8 52.1 51.7 52.1 7

51.7 51.6 51.5 51.4 51.3 51.2 51.1 51.0 51.0 51.0 51.1 51.2 51.3 51.5 51.6 51.6 51.7 51.7 51.7 51.7 51.7 51.7 51.6 51.6 51.4 8

51.5 51.7 51.3 51.2 51.1 51.1 51.1 51.1 51.1 51.2 51.3 51.5 51.7 51.9 52.0 52.1 52.2 52.2 52.2 52.1 52.1 52.0 51.9 51.8 51.6 9

l.6 51.4 51.3 51.2 51.1 5I.1 51.0 51.0 51.0 51.0 51.1 51.2 51.3 51.6 51.5 51.6 51.6 51.5 51.4 51.3 51.2 51.2 51.2 51.2 51.3 10 51.1 51.0 50.8 50.7 50.6 50.4 50.3 50.2 50.1 50.I 50.2 50.3 50.3 50.5 50.6 50.6 50.6 50.6 50.5 50.5 50.4 50.3 50.3 50.2 50.5 g

11 50.1 50.0 50.0 49.9 49.9 50.0 50.1 49.7 49.6 49.5 49.4 49.5 49.5 49.7 49.9 50.0 50.4 50.6 50.5 50.2 50.2 50.2 50.3 50.3 50.0 w

12 50.3 50.4 50.6 50.5 50.6 50.5 50.6 50.0 49.8 49.7 49.8 49.9 50.0 50.2 50.3 50.3 50.2 50.1 50.0 49.8 49.5 49.3 49.2 49.2 50.0 W

13 49.2 49.6 49.6 49.6 49.6 49.4 49.4 49.4 49.0 48.8 48.8 49.0 49.I 49.5 49.9 50.2 50.5 50.6 50.7 50.6 50.4 50.1 49.9 49.7 49.7 14 49.5 49.7 49.7 49.7 49.7 49.7 49.7 49.7 49.5 49.6 49.7 49.8 49.9 49.9 50.1 50.1 50.2 50.2 50.1 49.9 49.9 49.7 49.7 49.7 49.8 15 49.7 49.9 49.9 49.8 49.8 49.8 50.5 52.2 52.3 52.0 51.7 52.2 52.5 52.7 52.7 52.5 51.8 51.5 51.2 51.0 50.8 50.7 50.6 50.5 51.2 16 50.5 50.5 50.7 50.9 51.1 51.4 52.0 52.6 53.1 53.2 52.3 51.6 51.4 51.5 52.4 50.7 50.5 50.3 50.1 50.0 49.7 49.8 49.9 49.9 51.1 17 50.0 49.9 49.9 50.0 49.9 49.9 49.9 49.9 49.5 49.3 49.2 49.3 49.4 49.7 50.1 50.3 50.4 50.5 50.4 50.4 50.2 49.9 49.9 50.2 49.9 18 50.1 50.0 50.0 50.0 50.0 50.1 50.1 50.2 50.5 49.6 49.3 49.2 49.1 49.3 49.4 49.4 49.4 49.4 49.4 49.4 49.4 49.3 49.2 49.6 49.6 19 50.0 50.3 50.6 50.8 50.8 50.8 50.6 49.4 49.1 49.0 49.0 49.1 49.2 49.3 49.4 49.3 49.3 49.2 49.0 48.8 48.7 48.6 48.4 48.4 49.5 20 48.3 48.2 48.2 48.2 48.2 48.2 48.2 48.2 48.1 48.1 48.0 48,1 48,1 48,1 48.2 48.3 48.3 48.2 48.1 48.1 48.0 47.9 47.8 47.7 48.1 21 47.7 47.7 47.7 47.7 47.6 47.6 47.4 47.3 47.3 47.2 47.3 47.4 47.5 47.7 48.0 48.2 48.4 48.5 48.5 48.4 48.4 48.3 48.2 48.1 47.8 22 48.1 48.0 48.0 48.0 48.0 48.0 48.0 48.0 48.0 48.0 48,1 48.2 48.3 48.6 48.6 48.8 48.8 48.9 48.9 48.8 48.7 48.7 48.6 48.5 48.4 23 48.5 48.5 48.5 48.5 48.6 48.6 48.7 48.8 48.9 49.0 49.0 49.1 49.2 49.3 49.4 49.5 49.6 49.7 49.7 49.7 49.6 49.6 49.5 49.4 49.1 24 49.3 49.2 49.2 49.1 49.1 49.1 49.1 49.1 49.0 49.0 49.1 49.1 49.2 49.3 49.4 49.5 49.4 49.3 49.2 49.0 48.8 48.6 48.5 48.5 49.1 25 48.4 48.3 48.2 48,1 48.0 48.0 47.8 47.6 47.7 47.6 47.7 47.8 48.0 48.0 48.1 48.3 48.4 48.4 48.3 43.2 48.2 48.2 48.2 48,1 48.1 26 47.9 47.8 47.6 47.5 47.5 47.5 47.5 47.6 47.6 47.7 47.7 47.8 47.7 47.8 47.8 47.7 47.6 47.5 47.4 47.3 47.3 47.3 47.4 47.3 47.6 27 47.3 47.2 47.3 47.3 47.4 47.3 47.4 47.5 47.6 47.6 47.7 47.8 47.8 47.8 47.9 47.9 48.0 48.1 48.0 48.0 48.0 48.0 48.1 48.0 47.7 28 47.9 47.9 47.8 47.7 47.7 47.6 47.6 47.5 47.6 47.6 47.6 47.5 47.6 47.6 47.7 47.7 47.6 47.7 47.6 47.5 47.6 47.5 47.6 47.&

47.6 29 47.6 47.6 47.6 47.5 47.6 47.6 47.6 47.7 47.6 47.6 47.7 47.8 47.9 47.9 47.9 47.9 47.8 47.7 47.6 47.6 47.5 47.4 47.4 47.3 4_7.6 30 47.3 47.3 47.2 47.2 47.2 47.3 47.2 47.2 47.2 47.2 47.I 47.2 47.2 47.2 47.2 47.I 47.0 46.9 46.8 46.9 46.8 46.7 46.6 46.6 47.1 31 46.6 46.5 46.4 46.3 46.2 46.1 46.0 45.9 45.8 45.9 45.9 46.2 46.3 46.4 46.4 46.5 46.4 46.4 46.3 46.3 46.1 46.1 46.0 45.9 46.2 MONTHLY AVERACE 50.0

TABLE 3.1-11 4VERACE HOURLY TEMPERATURE IM 'F VERMONT YANKEE SAMPLE STATION NO. 3 NOVEMBER 1981 DAILY DAY HOUR AVERACE 1

2 3

4 5

6 7

8 9

10 Il 12 13 14 15 16 17 18 19 20 21 22 23 24 1

46.0 45.9 45.8 45.6 45.6 45.6 45.6 45.6 45.6 45.7 45.7 45.7 45.9 45.9 46.0 46.0 45.9 45.8 45.7 45.7 45.7 45.6 45.6 45.6 45.7 2

45.6 45.5 45.5 45.5 45.5 45.5 45.4 45.3 45.3 45.2 45.3 45.4 45.6 45.8 45.9 46.2 46.I 46.0 46.1 46.0 45.8 45.7 45.7 45.7 45.6 3

45.7 45.6 45.5 45.4 45.3 45.2 45.1 45.0 45.0 45.1 45.3 45.4 45.5 45.5 45.5 45.4 45.3 45.2 45.2 45.1 45.1 45.I 45.1 45.1 45.3 4

45.0 45.0 45.0 44.9 44.9 44.9 44.9 44.8 44.9 44.9 45.0 45.1 45.3 45.4 45.5 45.4 45.3 45.3 45.3 45.2 45.2 45.1 45.1 45.0 45.1 5

45.0 44.9 44.8 44.8 44.8 44.8 44.8 44.7 44.7 44.7 44.8 44.9 45.0 45.2 45.3 45.3 45.3 45.2 '45.1 45.1 45.0 45.0 44.9 44.9 45.0 6

44.9 44.9 44.9 44.9 44.9 45.0 44.9 44.9 44.9 44.9 45.0 45.0 45.0 45.0 45.0 45.0 45.1 45.1 45.2 45.2 45.2 45.1 45.0 45.0 45.0 7

44.9 44.8 44.5 44.5 44.6 44.6 44.6 44.6 44.5 44.5 44.6 44.7 44.8 44.8 44.9 44.8 44.6 44.5 44.4 44.4 44.3 44.1 44.1 44,0 44.5 8

43.8 43.8 43.7 43.6 43.6 43.5 43.5 43.5 43.4 43.6 44.0 44.3 44.5 44.7 44.7 44.7 44.6 44.4 44.2 43.9 43.8 43.8 43.7 43.7 44,0 9

43.6 43.5 43.5 43.4 43.4 43.3 43.3 43.3 43.2 43.3 43.4 43.5 43.6 43.6 43.6 43.7 43.7 43.7 43.8 43.8 43.7 43.6 43.4 43.3 43.5 10 43.1 43.0 42.8 42.5 42.4 42.4 42.3 42.2 42.0 42.1 42.3 42.6 43.0 43.2 43.1 43.0 42.9 43.0 42.9 42.8 42.7 42.5 42.5 42.5 42.7 g

11 42.4 42.3 42.3 42.3 42.3 42.3 42.3 42.3 42.2 42.I 42.2 42.4 42.6 42.7 42.8 42.7 42.6 42.5 42.3 42.3 52.3 42.3 42.3 42.3 42.4 La 12 42.3 42.3 42.1 41.9 41.7 41.6 41.5 41.4 41.4 41.4 41.5 41,6 41.8 41.9 41.9 41.9 41.7 41.7 41.6 41.5 41.4 41.3 41.3 41.2 41.7 A

13 41.2 41.3 41.2 41.2 41.2 4l.3 41.3 41.2 4I.2 41.1 41.0 41.0 41.1 41.2 41.2 41.3 41.2 41.2 41.2 41.1 41.1 41.1 41.2 41.2 41.2 I

14 41.2 41.2 41.1 41.1 41.1 41.0 40.9 40.7 40.6 40.5 40.5 40.5 40.6 40.7 40.8 40.8

0.8 40.7 40.7 40.6 40.6 40.6 40.6 40.6 40.8 15 40.7 40.7 40.7 40.7 40.7 40.8 40.8 40.8 40.8 40.8 40.8 40.9 40.9 40.8 40.8 40.7 40.6 40.6 40.5 40.5 40.5 40.5 40.5 40.6 40.7 16 40.7 40.8 40.8 40.9 40.9 40.9 40.9 40.9 40.8 40.8 40.8 40.8 40.9 40.9 40.9 40.9 40.9 40.9 40.9 40.9 40.9 41.0 41.0 41.0 40.9 17 41.1 41.1 41.1 41.2 41.1 41.1 41.1 41.1 41.0 41.0 41.1 41.1 41.1 41.1 41.2 41.2 41.2 41.2 41.3 41.3 41.4 41.5 41.5 41.6 41.2 18 41.6 41.7 41.8 41.8 41.8 41.8 41.8 41.8 41.9 41.9 42.0 42.0 42.1 42.2 42.2 42.2 42.2 42.2 42.2 42.3 42.3 42.4 42.4 42.4 42,0 19 42.4 42.3 42.3 42.3 42.2 42.2 42.2 42.2 42.1 42.1 42.1 42.2 42.2 42.3 42.3 42.3 42.3 42.3 42.3 42.4 42.4 42.5 42.5 42.6 42.3 20 42.6 42.7 42.7 42.7 42.7 42.7 42.7 42.7 42.8 42.8 42.8 42.8 42.9 43.0 43.0 43.0 43.1 43.1 43.1 43.2 43.1 43.0 43.0 42.9 42.9 21 42.9 42.8 42.8 42.8 42.8 42.8 42.8 42.8 43.1 42.8 42.8 42.8 42.8 42.8 42.8 42.8 42.8 42.8 42.8 42.8 42.7 42.7 42.6 47.6 42.8 22 42.5 42.4 42.4 42.3 42.3 42.3 42.3 42.3 42.3 42.6 42.3 42.4 42.4 42.4 42.5 42.5 42.4 42.4 42.3 42.6 42.3 42.2 42.3 42.2 42.4 23 42.2 42.1 42.1 42.1 42.1 42.0 42.0 42.0 41.9 41.9 41.9 41.9 41.9 41.9 41.9 41.9 41.8 41.7 41.7 41.6 41.5 41.5 41.4 41.3 41.8 24 41.3 41.3 41.2 41.1 41.0 40.9 40.8 40.7 40.6 40.5 40.5 40.5 40.6 40.7 40.8 40.8 40.8 40.7 40.7 40.6 40.5 40.4 40.3 40.2 40.7 25 40.0 39.9 39.8 39.7 39.6 39.5 39.5 39.4 39.3 39.3 39.1 39.1 39.0 39.0 39.0 39.0 39.0 38.9 38.9 38.8 38.7 38.7 38.6 38.5 39.2 26 38.5 38.4 38.3 38.3 38.3 38.2 38.1 38.1 38.0 37.8 37.7 37.7 37.9 38.1 38.3 38.1 38.4 38.4 38.4 38.4 38.4 38.4 38.4 38.3 38.2 27 38.1 38.3 38 I 38.2 38.1 38.0 38.0 37.9 37.8 37.8 37.8 37.9 37.9 38,0 38.1 38.0 37.9 37.8 37.8 37.9 37.8 37.8 37.8 37.8 37.9 28 37.8 37.7 37.7 37.7 37.7 37.6 37.6 37.5 17.5 37.6 37.5 37.6 37.5 37.5 37.6 37.5 37.6 37.6 37.5 37.5 37.5 37.4 37.5 37.5 37.6 29 37.4 37.3 37.3 37.2 37.1 37.0 37.0 36.8 36.9 37.0 37.0 37.1 37.1 37.2 37.1 37.0 36.9 36.8 36.8 36.7 36.7 36.6 26.5 36.6 37.0 30 36.6 36.5 36.4 36.3 36.2 36.2 36.2 16.1 36.0 36.1 36.2 36.4 36.5 36.5 36.4 36.3 36.3 36.3 36.3 36.2 36.2 36.2 36.2 36.2 36.3 MONTHLY AVERACE 41.9

TABLE 3.1-12 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE STATION NO. 3 DECEMBER 1981 DAILY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

to 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1

36.2 36.1 36.3 37.3 38.0 37.8 37.3 %.4 %.5 36.7 37.2 36.P 36.3 35.7 35.6 35.4 35.3 35.2 35.2 35.2 35.2 35.2 35.2 35.2

%.I 2

35.1 35.1 35.2 35.2 35.2 35.1 35.1 35.1 35.7 35.2 35.0 34.9 34.9 34.8 34.8 34.9 34.8 34.9 35.0 35.0 35.1 35.2 35.4 35.4 35.1 3

35.4 35.4 35.4 35.4 35.5 35.7 35.7 35.9 37.3 36.4 35.9 35.6 35.6 35.6 35.6 35.7 35.7 35.6 35.6 35.7 35.7 35.7 35.7 35.7 35.7 4

35.7 35.6 35.5 35.4 35.3 35.4 36.8 35.7 35.3 35.2 35.2 35.2 35.3 35.4 35.5 35.6 35.7 35.7 35.7 35.7 35.7 35.7 35.8 35.9 35.6 5

%.1 36.1 36.2 36.0 36.6 37.5 37.8 37.8 37.9 37.5 36.2 35.7 35.6 31.7 35.6 35.6 35.6 35.6 35.6 35.6 35.6 35.6 35.6 35.6 36.2 6

35.5 35.6 35.5 35.5 35.4 35.4 35.2 35.2 36.0 35.3 35.0 %8 34.8 34.9 34.7 34.7 34.6 34.5 %.6 34.5 34.5 %.5 34.4 %.3 35.0 7

34.4 34.4 %.3 %4 34.4 34.6 35.6 %.7 34.3 34.3 34.3 34.4 34.5 34.6 34.8 34.9 34.9 34.9 34.9 34.9 34.9 34.9 34.9 34.8 34.7 8

34.8 34.8 %.7 M.f 34.5 34.5 34.5 34.7 %.8 37.4 36.7 35.6 35.0 34.9 34.8 34.8 34.8 34.8 34.7 34.7 34.7 34.7 34.7 34.7 35.0 9

%.7 34.7 34.6 34.4 34.2 %.0 33.9 34.3 %.9 38.9 37.7 36.3 35.3 35.0 35.0 35.1 36.6 35.7 34.9 34.4 34.1 %0 33.9 33.9 15.1 10 35.2 34.7 35.6 35.3 %.7 34.4 34.3 34.5 M.3 35.6 34.5 33.9 33.8 33.9 34.0 34.1 34.2 34.2 34.2 34.1 34.0 33.9 33.9 33.9 34.5 II 34.2 34.2 34.5 34.5 34.5 34.7 36.4 38.1 38.4 37.3 36.0 35.0 34.7 34.7 %7 34.8 34.8 34.7 34.6 34.5 34.5 34.5 34.5 34.6 35.1 g

w 12 34.6 34.6 35.3 37.4 35.1 34.1 34.2 34.8 38.0 38.8 37.4 35.9 35.2 34.8 34.7 34.6 35.6 35.I 34.5 34.3 %3 34.2 34.2 %.2 35.2 U1 13 34.2 34.0 33.9 34.3 34.6 34.8 37.6 37.8 37.8 38.1 38.7 39.9 38.6 37.9 37.9 37.9 38.0 38.2 17.0 35.8 35.1 34.8 34.7 3".5 36.5 I

14 34.5 34.6 34.6 34.1 34.1 %.4 35.3 38.1 38.6 37.9 36.8 35.6 34.9 34.6 34.5 34.4 35.4 34.3 34.3 34.2 34.2 34.1 34.1 34.0 35.0 15 34.0 33.9 33.8 33.7 33.8 34.2 37.1 37.6 %0 34.8 %2 34.1 34.1 34.1 34.1 34.1 34.2 34.1 %.2 34.1 34.1 34.1 34.0 34.0 34.4 16 34.0 34.0 33.8 33.7 33.9 34.5 37.5 37.7 %.0 34.8 34.3 34.1 34.0 34.0 34.0 33.9 33.8 33.8 33.7 33.7 33.7 33.7 33.6 33.8 34.3 17 33.9 33.8 33.8 34.0 34.3 34.8 37.8 18.5 37.8 36.2 %.9 34.4 34.2 34.2 34.1 34.1 34.1 %.1 34.0 34.0 33.9 33.9 33.9 33.9

%.7 18 33.8 33.7 33.8 34.1 34.5 35.2 37.8 38.6 37.8 36.3 34.9 34.3 34.1 %.0 34.0 33.9 33.9 33.9 33.9 33.9 33.9 33.9 33.9 33.8 34.7 19 33.8 33.6 33.7 34.0 35.1 37.9 38.0 38.1 38.4 37.8 36.5 35.2 34.5 34.3 34.2 34.1 34.0 33.9 33.9 34.0 33.9 33.7 33.7 33.6 35.0 20 33.6 33.6 33.6 33.7 33.8 34.2 34.6 35.1 37.7 37.9 38.2 38.4 39.3 38.5 38.3 38.3 37.9 38.1 38.0 36.6 35.2 34.8 34.7 34.7 36.2 21 34.6 34.4 34.4 34.7 34.9 35.5 37.7 38.0 38.6 37.9 36.4 35.1 34.5 34.3 34.2 34.1 34.1 34.0 34.0 34.0 34.2 34.4 34.4 34.2 35.1 22 34.1 34.1 34.I 34.3 34.5 34.9 37.1 38.0 38.7 37.2 35.7 34.6 34.2 34.1 34.0 34.I 34.0 33.9 33.9 33.9 33.9 34.2 34.3 34.3 34.8 23 34.3 34.3 34.3 %.2 34.4 34.9 37.5 38.2 37.3 35.9 34.8 34.3 34.1 34.1 34.0 33.9 33.9 33.9 33.9 33.9 33.9 34.0 33.9 33.9 34.7 24 33.9 34.0 34.5 34.9 34.9 34.8 36.5 36.6 35.2 34.3 34.0 33.9 33.9 34.0 34.0 34.1 34.1 34.0 34.0 33.9 33.9 33.9 33.9 33.9 34.4 25 33.9 33.9 33.9 33.8 34.0 34.1 34.1 34.2 35.5 36.2 37.5 38.3 37.5 35.9 35.3 35.2 36.4 37.3 37.1 35.4 34.6 34.2 34.1 34.0 35.3 26 33.9 34.6 %3 33.9 34.2 34.7 35.4 37.3 37.9 38.1 37.I 35.9 34.9 34.4 34.3 34.3 34.1 34.1 34.1 %.I 34.0 33.7 33.2 32.7 34.8 27 32.6 32.5 32.5 32.5 32.4 32.5 32.4 32.4 32.5 32.5 32.7 33.7 32.6 32.6 32.5 33.0 %.3 33.1 32.6 32.5 32.4 32.4 32.4 32.4 32.7 28 32.4 32.4 32.4 32.4 32.4 32.5 32.5 32.5 33.0. 34.3 33.4 33.1 32.8 32.8 32.8 32.8 32.7 32.7 32.7 32.7 32.7 32.7 32.8 32.8 32.8 29 32.8 32.8 32.8 32.8 32.8 32.8 32.8 33.3 35.0 36.2 35.5 34.5 34.1 33.9 33.8 33.8 33.7 33.7 33.6 33.7 33.7 33.7 33.6 33.5 33.7 30 33.4 33.5 33.8 34.5 35.6 37.6 37.9 38.1 38.6 37.7 36.1 34.4 33.8 33.7 33.8 33.7 33.7 33.6 33.6 33.5 33.5 33.5 33.6 33.6 34.8 31 33.5 33.5 33.5 33.5 33.4 33.3 33.3 34.5 37.8 37.2 35.4 34.4 34.1 33.9 33.9 33.9 33.8 33.8 33.8 33.8 33.8 33.8 33.8 33.7 34.1 MONTHLY AVERACE 34.9

i TABLE 3.2-1 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE STATION NO. 2 JANUARY 1981 DAILY DAY HOUR AVERACE 1

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 IS 19 20 21 22 23 24 1

32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 12.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 2

32.0 32.0 32.0 12.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 3

32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 4

32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 5

32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 12.0 32.0 6

32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 7

32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.1 32.1 32.1 32.0 32.0 32.0 32.0 8

12.0 32.0 12.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.0 32.1 32.0 32.0 32.1 32.1 32.0 32.1 32.1 32.1 32.I 12.0 32.1 12.0 32.0 9

32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 10 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.0 32.0 32.0 32.0 32.1 32.1 32.1 32.1 32.1 32.1 32.0 l

II 32.1 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.1 32.1 32.0 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.0 DJ 12 32.1 32.1 32.t 32.1 32.1 32.1 32.1 32.I 32.1 32.2 32.2 32.2 32.2 32.1 32.I 32.2 32.1 32.1 32.2 32.2 32.2 32.2 32.2 32.1 32.1 13 32.1 32.1 32.I 32.1 32.1 32.1 32.1 32.I 32.1 32.1 32.2 12.2 32.2 32.2 32.1 32.2 32.2 32.2 32.1 32.1 32.1 32.1 32.0 32.0 32.1 14 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.1 32.0 32.0 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.0 32.1 32.1 32.1 32.1 32.0 32.0 12.1 15 32.0 32.0 32.0 32.0 12.0 32.0 32.0 32.0 32.0 32.1 32.1 32.1 32.1 32.1 12.1 32.I 32.1 32.0 32.0 32.1 37.1 32.I 32.0 32.0 32.0 16 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.0 32.1 32.0 32.0 32.l 32.1 32.0 32.0 32.1 32.0 32.0 32.0 32.0 32.0 17 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.0 32.0 18 32.1 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.0 32.0 32.0 32.0 32.0 19 32.0 32.1 12.0 12.0 32.0 32.0 32.0 32.0 32.0 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 20 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 21 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.1 32.1 32.0 32.0 32.0 32.0 22 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 12.0 32.0 32.0 32.0 32.0 32.0 23 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 24 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 25 32.0 32.0 32.0 32.0 32.C 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 26 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 27 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 28 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 29 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 30 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 31 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 32.0 MONTHLY AVERACE 32.0 (24 0 t ; <_ s m_______.-_

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1 TABLE 3.2-3 AVERACE HOURI.Y TEMPERATURE IN *F VERMONT YANKE7' SAMPLE STATION NO. 7 MARCH 1981 DAILY DAY HOUR AVERACE 1

2 3

4 5

6 7

8 9

to 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1

33.9 33.9 33.9 33.9 33.9 33.8 33.8 33.8 33.9 34.2 34.9 35.4 35.6 35.8 35.6 %.9 34.6 34.6 34.5 %.4 34.2 34.I 34.0 33.9 34.4 2

33.8 33.9 33.8 33.8 33.6 33.6 33.6 33.7 33.9 M.0 34.0 34.1 34.2 34.3 %.4 34.4 34.5 34.4 34.4 %3 34.3 34.2 %.2 34.1 34.1 3

34.0 33.9 33.8 13.7 33.6 33.5 33.5 33.4 33.5 33.5 33.5 33.8 34.0 34.2 34.4 34.5 34.5 34.5 34.4 %.2 34.1 33.9 33.7 33.6 33.9 4

33.4 33.3 33.2 33.2 33.1 33.1 33.3 33.2 33.1 33.2 33.3 33.4 33.5 33.5 33.8 33.8 33.9 33.9 34.1 34.1 34.0 34.0 34.0 33.9 33.6 5

34.0 34.0 34.0 33.9 33.8 33.6 33.5 33.4 33.5 33.6 33.7 33.8 33.8 33.9 33.9 33.9 34.0 33.9 34.0 %.0 33.9 33.9 33.9 33.8 33.8 6

33.7 33.6 33.5 33.5 33.4 33.3 33.4 33.4 33.4 33.5 33.6 33.4 33.4 33.4 33.4 33.5 13.4 33.5 33.5 33.5 33.6 13.6 33.6 33.6 33.5 7

31.7 33.6 33.7 33.6 33.5 33.6 33.6 33.5 33.6 33.8 33.9 33.6 33.6 33.9 %.2 34.1 34.1 34.0 %.0 %.! %.I 34.2 %.2 14.3 13.9 8

34.4 %.4 34.3 34.4 34.4 34.3 34.4 %.4 34.4 %.5 %.6 34.6 34.6 %.6 %.5 34.4 34.5 %.4 34.4 %.4 34.3 %.4 %4 %4

%.4 9

34.5 %4 M.3 34.4 34.3 34.2 %.4 34.3 %5 34.6 %.8 34.9 34.9 34.9 34.9 34.8 34.7 34.6 %.6 34.6 34.5 34.5 %.5 %.4

%.6 to

%.5 %.5 34.5 %.6 34.6 34.6 34.6 34.7 35.0 35.4 35.7 35.7 35.7 35.8 36.0 36.0 35.8 35.6 35.5 35.5 35.3 35.3 35.3 35.3 35.2 l

11 35.3 35.3 35.3 35.3 35.3 35.3 35.3 35.4 35.6 35.8 36.0 36.3 36.9 36.6 36.4 36.4 36.2 35.9 35.8 35.6 35.5 35.5 35.4 35.4 35.7 12 35.4 35.4 35.3 35.3 35.2 35.2 35.2 35.3 35.5 15.6 35.8 36.0 36.4 36.6 36.3 36.3 36.3 36.0 35.8 35.7 35.7 35.6 35.5 35.6 35.7 l

13 35.5 35.5 35.5 35.4 35.4 35.4 35.4 35.5 35.7 %.0 36.6 %.9 36.9 37.2 36.9 36.8 36.7 36.4 36.3 %.2 36.1 %.0 35.9 35.8 14 35.9 35.8 35.8 35.7 35.7 35.4 35.5 35.5 35.6 35.9 %.5 37.0 37.2 37.4 37.3 %.9 36.5 36.0 35.8 J5.6 35.4 35.4 35.3 35.2 36.0 15 35.1 35,0 35.0 %.9 34.8 34.7 34.7 34.7 35.0 35.5 35.9 36.6 36.6 36.6 36.7 36.5 36.3 36.2 36.1 36.0 36.0 35.9 35.9 35.9 35.7 to 35.9 35.8 35.7 35.7 35.6 35.6 35.6 35.6 35.7 36.1 36.4 36.5 36.8 37.1 37.3 37.4 37.I 36.8 36.6 36.2 35.9 35.7 35.4 35.2 36.2 17

%.9 %.8 %.5 %.5 34.3 %.2 %.0 34.0 34.2 %.8 15.3 35.6 36.1 36.5 36.5 36.3 %.2 35.7 35.7 35.6 35.5 35.5 35.4 35.4 35.2 18 35.3 35.2 35.2 35.1 35.0 34.9 34.9 34.8 34.6 34.7 34.8 35.0 35.4 35.6 35.7 35.7 35.5 35.1 35.0 35.0 %.9 34.8 %.7 34.4 35.1 19

%.3 34.I 33.9 33.7 33.8 33.9 %.2 34.7 34.9 34.8 34.8 35.4 35.9 35.8 35.6 35.4 35.3 35.1 34.9 35.0 35.1 35.0 %.9 34.8 34.8 20

%.7 34.7 34.6 %.7 %.8 %.7 34.8 %.7 %.6 %.9 35.1 35.0 35.0 35.3 35.6 35.4 35.2 35.2 35.2 35.3 35.4 35.4 35.3 35.2 35.0 21 35.0 34.9 34.8 34.8 %.8 34.8 34.7 %.5 %.7 35.0 35.5 35.5 35.5 35.6 35.5 35.2 35.0 %.9 %.9 34.9 35.1 35.2 35.2 35.3 35.1 22 35.3 35.2 35.3 35.1 35.1 35.0 35.0 35.0 35.2 35.5 35.8 36.1 36.1 %.0 36.1 36.0 35.9 35.7 35.6 35.5 35.5 35.4 35.3 35.3 35.5 23 35.2 35.2 35.3 35.3 35.3 35.2 34.9 35.0 35.4 35.8 36.4 37.2 37.2 37.3 37.1 37.0 36.8 36.5 36.4 36.3 36.3 %3 36.4 36.4 36.1 24 36.4 36.4 36.4 36.5 %.5 36.3 36.1 36.0 36.3 36.6 37.0 37.2 17.2 37.2 37.3 37.6 37.2 37.0 36.9 36.7 36.7 36.7 36.8 36.8 36.7 25

%.9 37.0 37.0 36.9 36.7 %.7 36.5 36.4 36.6 36.6 %.7 36.6 36.6 36.8 37.1 37.1 36.9 %7 36.6 36.6 36.6 36.6 36.7 36.8 36.7 26 37.0 37.0 37.1 37.1 37.0 36.8 36.8 36.8 %.9 37.1 37.5 38.0 38.5 38.6 38.7 38.8 38.5 38.3 38.2 38.2 38.2 38.3 38.2 38.0 37.7 27 38.1 38.1 38.1 38.0 38.0 37.9 37.8 37.8 37.9 38.2 38.5 38.6 39.0 39.3 40.1 39.9 39.8 39.5 39.2 39.0 38.9 38.8 38.6 38.6 38.7 28 38.4 38.3 38.1 38,0 37.8 37.7 37.7 37.9 38.2 38.7 39.3 39.7 40.2 40.4 40.4 40.4 40.2 39.8 39.6 39.5 39.4 39.5 39.5 39.4 39.1 29 39.4 39.4 39.4 39.6 39.7 39.6 39.7 39.8 40.0 40.4 41.0 41.7 41.9 41.8 41.8 42.0 41.7 41.6 41.5 41.4 41.4 41.4 41.4 41.4 40.8

(

30 41.4 41.4 41.4 41.4 41.4 41.4 41.6 41.9 42.3 42.4 42.5 42.7 42.8 43.0 43.3 43.3 43.3 43.2 43.3 43.3 43.4 43.5 43.4 43.3 42.5 31 43.1 43.0 42.8 42.8 43.0 43.2 43.3 43.5 43.5 43.6 43.5 43.4 43.3 43.2 43.2 43.3 43.1 42.9 42.8 42.5 42.3 42.2 42.I 42.0 43.0 j

MONTHLY AVERACE 36.1 r

i

?

M M

i

TABLE 3.2-4 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE STATION NO. 7 APRIL 1981 DAILY DAY HOUR AVERACE 1

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 IS 19 20 21 22 23 24 1

48.8 41.7 41.6 41.5 41.4 41.2 41.1 41.1 41.2 41.4 41.6 41.7 41.9 42.2 42.3 42.5 42.6 42.7 42.7 42.8 42.9 43.0 43.0 43.0 42.0 2

43.0 42.9 42.8 42.9 42.9 42.8 42.9 43.0 43.0 43.1 43.4 43.8 43.6 43.4 43.6 43.9 44.1 43.7 43.5 43.3 43.2 43.0 42.9 42.8 43.2 3

42.6 42.4 42.2 42.0 41.8 41.6 41.4 41.3 41.4 41.4 41.6 41.9 42.1 42.4 42.8 43.2 43.4 43.4 43.5 43.5 43.6 43.5 43.4 43.4 42.5 4

SYSIDI INOPERATIVE 5

SYSTEM INOPERATIVE 6

SYSTEM INOPERATIVE 7

42.7 42.7 42.8 42.8 42.7 42.6 42.6 42.7 42.8 42.8 43.0 43.1 43.5 43.6 43.9 44.0 44.1 44.1 44.1 44.0 43.9 44.1 43.8 43.6 43.3 8

43.5 43.3 43.1 42.9 42.7 42.5 42.4 42.4 42.4 42.5 42.8 43.1 43.4 43.8 44.0 44.2 44.3 4.4 44.4 44.5 44.6 44.6 44.6 44.6 43.5 9

44.6 44.7 44.7 44.7 44.7 44.6 44.5 44.4 44.4 44.4 44.4 44.6 44.7 44.7 44.7 44.8 44.9 45.0 43.1 45.2 45.2 45.2 45.1 45.0 44.8 10 45.1 45.1 45.2 45.2 45.2 45.1 45.1 45.1 45.1 45.3 45.5 45.7 45.7 45.8 45.9 46.1 46.I 46..

46.0 45.9 45.9 45.9 45.9 45.8 45.6 I

11 45.8 45.8 45.7 45.8 45.8 45.8 45.8 45.9 46.0 45.9 45.8 45.8 45.8 45.8 45.9 45.9 45.9 46,0 46.0 45.9 46.1 46.2 46.2 46.1 45.9 W

12 45.9 45.7 45.6 45.6 45.5 45.5 45.4 45.5 45.7 45.9 46.2 46.4 46.5 46.6 46.6 46.6 46.5 46.5 46.5 46.4 46.2 46.0 45.9 45.7 46,0 y

13 45.6 45.5 45.5 45.4 45.4 45.4 45.4 45.4 45.5 45.7 45.8 46.1 46.1 46.2 46.4 46.5 46.4 46.3 46.2 46.2 40.2 46.3 46.1 45.9 45.9 14 45.8 45.7 45.6 45.5 45.5 45.5 45.5 45.5 45.6 45.7 45.6 45.5 45.3 45.2 45.1 45.0 44.9 44.8 44.7 44.6 44.5 44.5 44.5 44.4 45.2 15 44.3 44.2 44.3 44.2 44.0 43.8 43.6 43.6 43.7 44.0 44.3 44.4 44.8 45.0 44.9 44.9 44.9 44.8 44.7 44.6 44.5 44.4 44.2 44.1 44.3 16 44.0 43.9 43.8 43.6 43.5 43.4 43.2 43.0 42.9 43.1 43.1 43.2 43.2 43.2 43.1 43.3 43.5 43.5 43.3 43.2 43.3 43.4 43.5 43.5 43.4 17 43.6 43.7 43.6 43.6 43.7 43.6 43.7 43.8 43.8 43.8 43.9 43.8 43.7 43.8 43.9 43.9 43.8 43.7 43.8 43.7 43.6 43.7 43.7 43.6 43.7 18 A3.6 43.5 43.5 43.6 43.7 43.7 43.7 43.8 43.9 44.0 44.2 44.3 44.5 44.6 44.8 45.0 45.1 45.2 45.3 45.5 45.4 45.2 45.2 45.2 44.4 19 45.2 45.1 45.0 44.9 44.7 44.6 44.4 44.3 44.3 44.4 44.5 44.7 45.0 45.1 45.2 45.3 45.3 45.4 45.6 45.6 45.6 45.6 45.6 45.6 45.0 20 45.5 45.5 45.5 45.5 45.4 45.3 45.4 45.4 45.4 45.6 45.7 45.7 45.6 45.7 45.8 46.0 46.2 46.2 46.1 46.1 46.0 46.0 45.9 45.9 45.7 21 45.7 45.5 45.2 45.1 44.9 44.8 44.7 44.6 44.6 44.7 44.8 44.9 45.0 45.1 45.3 45.4 45.4 45.3 45.3 45.1 45.1 45.0 44.9 44.7 45.0 22 44.6 44.4 44.2 44.0 43.9 43.7 43.6 43.7 43.7 43.7 43.8 44.0 44.2 44.3 44.4 44.6 44.7 44.7 44.5 44.5 44.5 44.5 44.4 44.3 44.2 23 44.2 44.0 44.0 43.9 43.7 43.7 43.7 43.6 43.5 43.4 43.5 43.4 43.4 43.5 43.6 43.6 43.5 43.4 43.4 43.4 43.4 43.4 43.4 4:.4 43.6 24 43.4 43.5 43.5 43.5 43.5 43.6 43.7 43.8 43.8 43.9 44.0 44.1 44.1 44.2 44.4 44.3 44.3 44.4 44.4 44.5 44.6 44.6 44.7 44.8 44.t 25 44.8 44.8 44.8 44.7 44.7 44.7 44.6 44.6 44.5 44.4 44.3 44.1 44.0 43.9 43.8 43.9 43.9 44.0 44.0 44.0 43.9 43.9 43.8 43.7 44.2 26 43.7 43.7 43.6 43.6 43.5 43.5 43.6 43.8 44.0 44.2 44.3 44.4 44.3 44.4 44.4 44.5 44.5 44.5 44.4 44.4 44.5 44.5 44.6 44.I 27 44.6 44.7 44.6 44.7 44.7 44.6 44.6 44.6 44.6 44.8 45.0 45.1 45.2 45.3 45.4 45.5 45.7 45.8 45.9 45.9 45.9 46.0 46.1 46.1 45.2 28 46.1 46.2 46.3 46.4 46.6 46.6 46.7 46.8 47.0 47.3 47.4 47.4 47.3 47.3 47.2 47.2 47.3 47.2 47.1 47.0 47.0 47.0 47.1 47.1 46.9 29 47.1 47.1 47.1 47.0 47.0 47.1 47.2 47.3 47.6 47.9 48.0 48.1 48.2 48.4 48.4 48.4 48.4 48.4 48.3 48.3 48.3 48.3 48.3 48.4 47.9 30 48.5 48.5 48.4 48.4 48.4 48.3 48.3 48.4 48.5 48.6 48.8 48.9 49.1 49.5 49.6 49.7 49.8 49.8 49.8 49.8 49.8 49.8 49.9 49.6 49.1 MONTHLY AVERACE 44.8

)

TABLE 3.2-5 AVERACE HOURLY TEMPERATTRE IN *F VERMONT YANKEE SAMPLE STATION NO. 7 MAY 1981 DAILY DAY HOUR AVE RACE I

2 3

4 5

6 7

8 9

10 Il 12 13 la 15 16 17 18 19 20 21 22 23 24 1

49.8 49.7 49.7 49.7 49.7 49.7 49.7 49.9 50.1 50.0 50.5 50.7 50.9 50.9 51.0 51.2 51.2 51.2 51.2 51.2 51.2 51.2 51.2 51.2 50.5 2

51.1 51.1 51.1 51.1 51.1 51.1 51.2 51.3 51.4 51.6 St.8 51.9 51.8 51.8 51.8 51.7 51.8 51.8 51.8 51.7 51.6 51.6 51.6 51.6 51.5 3

51.5 51.4 51.3 51.0 50.8 50.7 50.7 50.7 50.9 51.0 51.1 51.2 51.3 51.5 51.6 51.7 51.9 51.9 52.0 51.9 51.8 51.7 51.8 52.1 51.4 4

52.2 52.2 52.2 52.0 $1.7 51.5 51.4 51.5 51.6 51.7 51.8 52.0 52.3 52.6 53.0 53.4 53.4 53.4 53.4 53.3 53.3 53.3 53.3 53.2 52.5 5

53.I 53.0 53.0 52.9 52.9 52.9 52.9 53.0 53.1 53.2 53.3 53.5 53.S 54.0 54.4 54.4 54.5 54.5 54.5 54.4 54.2 54.1 53.9 53.9 53.6 6

53.8 53.8 53.7 53.8 53.8 53.9 54.1 54.3 54.6 54.9 55.3 55.5 55.6 55.7 55.8 55.8 55.6 55.5 55.4 55.3 55.2 55.1 55.0 54.9 54.8 7

54.8 54.7 54.5 54.4 54.3 54.1 54.1 54.1 54.2 54.4 54.6 54.7 54.8 54.9 55.0 55.0 55.0 55.0 54.8 54.6 54.4 54.3 54.2 54.2 54.5 8

54.1 54.1 54.0 53.9 53.8 53.6 53.6 53.8 53.9 53.9 54.1 54.2 54.3 54.8 55.1 55.2 55.5 55.6 55.3 55.2 55.3 55.4 55.2 54.9 54.5 9

54.9 54.7 54.6 54.6 54.6 54.6 54.5 54.5 54.6 54.5 54.6 54.6 54.7 54.7 54.9 55.2 55.3 55.2 55.3 $5.4 55.4 55.5 $5.6 55.7 54.9 10 55.6 55.5 55.6 55.5 55.6 55.5 55.6 55.6 55.6 55.6 5e.6 55.7 55.8 55.9 55.9 56.0 56.0 56.1 56.0 55.8 55.7 55.4 55.3 55.5 55.7 11 55.6 55.6 55.7 55.7 55.8 55.8 55.9 56.0 56.0 56.2 56.4 56.7 56.8 57.0 5/ ! 57.0 56.9 56.9 56.9 56.8 56.8 57.0 57.1 57.2 56.5 4.

12 57.2 57.1 57.0 57.0 57.0 57.0 57.0 57.0 57.1 57.2 57.2 57.4 57.5 57.7 57.7 57.8 57.9 57.8 57.9 57.8 57.8 57.9 57.9 57.9 57.4 C) 13 57.8 57.8 57.7 57.7 57.5 57.3 57.3 57.3 57.5 57.6 57.6 57.5 57.5 57.5 57.6 57.8 57.8 57.8 57.7 57.6 57.5 57.4 57.3 57.2 57.6 I

14 57.1 57.0 56.8 56.6 56.4 56.2 56.I 56.0 56.0 56.0 56.2 56.3 56.5 56.6 56.8 56.9 57.0 57.1 57.2 57.2 57.2 57.1 57.0 57.0 56.7 15 57.0 57.0 57.0 57.0 56.9 56.9 56.8 56.8 56.7 56.6 56.6 56.6 56.7 56.8 56.7 56.7 56.8 56.9 56.9 57.0 56.9 56.9 56.9 56.9 56.8 16 56.9 57.0 56.9 57.0 57.0 56.8 56.6 56.6 56.4 56.3 56.2 56.1 56.1 56.1 56,8 56.0 56.0 56.0 56.0 56.0 55.9 55.9 55.9 55.9 56.3 17 55.9 55.8 55.8 55.7 55.6 55.4 55.3 55.2 55.2 55.2 55.2 55.3 55.4 55.6 55.8 56.0 56.2 56.4 56.4 56.3 56.3 56.4 56.4 56.5 55.8 18 56.5 56.4 56.4 56.4 56.3 56.1 55.9 55.7 55.6 55.5 55.5 55.5 55.6 55.7 55.8 56.0 56.I 56.2 56.3 56.3 56.2 56.2 56.1 56.1 56.0 19 56.2 56.2 56.1 56.1 56.0 55.9 55.8 55.7 55.5 55.4 55.4 55.4 55.4 55.5 55.6 55.7 55.7 55.7 55.7 55.7 55.7 55.8 55.8 55.8 55.7 20 55.8 55.8 55.8 55.8 55.8 55.8 55.8 55.7 55.7 55.8 55.8 55.9 55.9 56.0 56.1 56.3 56.3 56.3 56.3 56.2 56.2 56.2 56.1 56.0 56.0 21 55.9 55.9 55.9 55.9 55.9 56.0 56.0 56.1 56.2 56.3 56.3 56.4 56.5 56.6 56.7 56.8 56.7 56.8 56.8 56.9 56.8 56.8 56.7 56.6 56.4 22 56.6 56.5 56.3 56.3 56.2 56.1 56.0 56.0 56.0 56.2 56.3 56.4 56.6 56.9 57.1 57.3 57.5 57.5 $7.5 57.4 57.4 57.4 57.4 57.3 56.8 23 57.1 57.0 57.0 57.0 57.0- 57.0 57.0 57.0 57.1 57.2 57.4 57.5 57.6 57.6 57.7 57.8 57.8 57.7 57.7 57.7 57.6 57.5 57.6 57.7 57.4 24 57.7 57.8 57.7 57.6 57.6 57.6 57.5 57.5 57.6 57.6 57.8 57.9 58.2 58.4 58.6 58.9 59.I 59.2 59.1 59.2 59.1 58.9 58.7 58.6 58.2 25 58.6 58.5 58.5 58.4 58.4 58.4 58.4 58.5 58.5 58.5 58.5 58.7 58.8 59.0 59.1 59.4 59.5 59.8 60.1 60.3 60.5 60.7 60.5 60.6 59.2 26 60.8 60.9 60.9 60.8 60.9 60.9 60,9 60.9 61.0 61.2 61.3 61.3 61.4 61.6 62.0 62.3 62.4 62.4 62.2 62.2 62.1 62.0 61.9 61.9 61.5 27 62.1 62.3 62.6 62.8 62.8 62.8 62.8 62.9 63.1 63.4 63.2 63.2 63.3 63.6 64.0 63.7 63.7 63.8 63.9 64.0 64.1 64.1 64.2 64.2 63.4 28 64.2 64.2 64.2 64.0 63.9 63.9 63.9 63.9 64.0. 64.1 64.3 64.5 64.7 64.9 65.2 65.4 65.6 65.7 65.9 66.1 66.1 66.2 66.2 66.2 64.9 29 66.0 65.8 65.7 65.6 65.6 65.6 65.5 65.5 6%.5 65.4 65.3 65.2 65.1 65.1 65.3 65.4 65.4 65.4 65.4 65.3 65.2 65.1 65.1 65.1 65.4 30 65.1 65.0 65.0 64.9 64.9 64.9 64.9 64.9 64.8 64.8 64.7 64.6 64.5 64.6 64.7 65.0 65,2 65.4 65.5 65.6 65.6 65.6 65.5 65.5 65.0 31 65.6 65.5 65.4 65.4 65.4 65.5 65.5 65.5 65.4 65.5 65.8 65.9 66.0 66.0 66.3 66.7 66.7 67.0 67.0 66.9 66.5 66.2 66.1 65.9 66.0 MONTHLY AVERACE 57.2 E

E E

O TABLE 3.2-6 AVERACE HOURLY TEMPERATURE IN 'F VERMONT YANKEE SAMPLE STATION NO. 7 JUNE 1981 DA'LY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

10 12 13 14 15 16 17 18 19 20 21 22 23 24 1

65.9 65.8 65.7 65.7 65.7 65.8 65.9 66.0 65.9 65.9 66.0 66.1 66.4 66.8 67.0 67.1 67.3 67.3 67.2 67.0 66.8 66.6 66.5 66.3 66.4 2

66.2 66.2 66.1 66.0 66.0 65.9 65.9 65.9 65.8 65.7 65.6 65.6 65.8 65.8 65.8 65.9 66.1 66.4 66.5 66.7 66.7 66.7 66.6 66.5 66.1 3

66.4 66.3 66.1 66.0 66.0 65.9 65.8 65.8 65.8 65.8 65.9 65.9 65.9 66.0 66.0 66.0 65.9 65.8 65.7 65.6 65.4 65.3 65.2 65.0 65.8 4

64.9 64.7 M.5 M.4 64.3 64.2 64.1 64.0 64.0 64.0 64.0 64.0 64.1 64.3 64.5 M.7 64.8 M.9 65.0 65.1 65.1 65.0 M.9 M.8 64.5 5

64.6 64.6 64.5 64.4 64.3 64.3 64.2 64.1 64.1 64.0 64.2 64.3 64.5 66.6 64.8 65.0 65,2 65.4 65.6 65.9 66.1 66.1 (6.1 66.2 64.9 6

66.2 66.1 66.I 66.0 66.0 65.9 65.8 65.7 65.6 65.5 65.5 65.6 65.5 65.6 65.8 66.0 66.4 66.9 67.1 67.3 67.5 67.6 67.7 67.6 66.3 7

67.6 67.5 67.3 67.3 67.2 67.1 67.0 66.9 66.9 66.8 66.8 66.9 67.0 67.3 67.4 47.7 67.8 67.9 68.0 68.0 67.9 68.1 68.I 68.I 67.4 8

68.2 68.2 68.1 68.1 68.0 67.8 67.7 67.6 67.3 67.0 66.9 66.9 67.0 67.1 67.3 67.5 67.7 67.9 68.1 68.2 68.3 68.3 68.2 68.1 67.7 9

67.9 67.6 67.3 67.0 66.7 66.5 66.3 66.2 66.1 66.1 66.I 66.2 66.4 66.7 67.0 67.2 67.5 67.7 67.7 67.6 67.4 67.2 67.1 66.9 66.9 10 66.8 66.7 66.5 66.4 66.4 66.3 66.3 66.4 66.5 66.6 66.7 66.8 66.9 67.0 67.1 67.1 67.1 67.0 66.9 66.7 66.6 66.4 66.2 65.9 66.6 11 66.0 65.9 65.9 65.8 65.8 65.8 65.8 65.9 66.0 66.1 66.3 66.4 66.5 66.7 66.8 66.7 66.7 66.6 66.6 66.6 66.6 66.4 66.2 66.1 66.3 g,

12 66.0 66.0 66.1 66.1 66.1 66.1 66.0 66.1 66.1 66.2 66.3 66.4 66.7 66.9 67.1 67.3 67.5 67.5 67.4 67.3 67.2 67.1 67.0 66.9 66.6 Fa 13 66.8 66.8 66.7 66.7 66.6 66.6 66.5 66.4 66.4 66.5 66.5 66.5 66.6 66.7 66.9 67.0 67.1 67.1 67.1 67.0 66.9 66.7 66.6 66.6 66.7 1

14 66.5 66.5 66.5 66.4 66.4 66.4 66.3 66.3 66.3 66.4 66.4 66.5 66.5 66.6 66.6 66.6 66.6 66.5 66.5 66.4 66.3 66.1 66.1 66.0 66.4 15 65.9 65.8 65.7 65.7 65.7 65.6 65.6 65.5 65.5 65.5 65.5 65.6 65.8 65.8 65.9 66.0 66.1 66.2 66.1 66.1 66.1 66.0 66.0 66.0 65.8 16 66.0 66.0 66.0 66.1 66.1 66.8 66.1 66.1 66.3 66.2 66.3 66.5 66.8 67.2 67.7 67.9 68.1 68.2 68.4 68.7 68.8 61.9 68.8 68.8 67.2 17 68.7 68.6 68.5 68.5 68.4 68.4 68.3 68.3 68.2 68.1 68.1 68.0 68,0 68.5 68.5 68.6 68.8 69.0 69.3 69.5 69.5 69.6 69.5 69.3 68.7 18' 69.2 69.0 68.8 68.6 68.6 68.5 68.4 68.4 68.4 48.4 68.3 68.4 68.6 69.1 69.3 69.5 69.8 70.1 70.4 70.6 70.6 70.6 70.7 70.7 69.3 19 70.7 70.7 70.7 70.7 70.6 70.7 70.6 70.7 70.7 70.8 70.6 70.4 70.4 70.5 70.8 71.0 71.1 71.2 71.3 71.4 71.5 71.4 71.4 71.4 70.9 20 71.4 71.4 71.4 71.4 71.4 71.4 78.4 71.5 71.5 71.6 72.0 72.0 72.2 72.3 72.4 72.4 72.5 72.5 72.4 72.5 72.6 72.6 72.5 72.5 72.0 21 72.5 72.5 72.5 72.4 72.4 72.3 72.3 72.2 72.1 72.1 72.0 71.9 71.8 71.8 71.5 71.6 71.6 71.8 71.9 78.9 71.9 71.7 71.8 71.9 72.0 22 72.0 72.0 72.0 72.0 72.0 72.0 72.0 72.0 72.1 72.1 72.2 72.2 72.1 72.0 72.0 71.9 71.8 71.6 71.4 71.3 71.2 71.2 71.1 71.0 71.8 23 10.9 70.8 70.8 70.9 71.0 71.0 70.9 70.9 70.9 70.9 70.8 70.8 70.7 70.8 70.8 70.8 70.6 70.6 70.6 70.6 70.5 70.4 70.4 70.4 70.7 24 70.4 70.3 70.2 70.2 70.1 70.1 70.1 70.1 70.1 70.2 70.2 70.1 70.3 70.4 70.6 70.6 70.7 70.8 70.7 70.7 70.4 70.3 70.2 70.3 70.3 25 70.3 70.3 70.3 70.3 70.3 70.3 70.3 70.3 70.4 70.4 70.4 70.3 70.3 70.1 70.3 70.2 70.2 70.2 70.3 70.3 70.4 70.2 70,0 69.9 70.3 26 69.8 69.8 69.7 69.7 69.6 69.6 69.6 69.6 69.6 69.8 69.7 69.4 69.3 69.3 69.2 68.8 68.8 68.8 68.6 68.4 68.2 68.0 68.0 63.0 69.1 27 67.9 67.8 67.8 67.7 67.7 67.7 67.6 67.6 67.7 67.7 67.7 67.7 67.6 67.7 67.9 68.0 68.2 68.4 68.4 68.6 68.5 68.5 68.6 68.6 68.0 28 68.5 68.4 68.3 68.2 68.2 68.1 68.1 68.2 68.2 68.2 68.2 68.3 68.2 68.2 68.5 68.6 68.9 68.9 68.9 69.0 69.0 69.0 69.1 69.3 68.5 29 69.2 69.2 69.1 69.1 69.0 68.9 68.9 68.9 69.0 69.0 69.0 68.9 69.0 69.2 69.4 69.7 70.0 70.4 70.7 70.8 70.7 70.7 70.7 70.7 69.6 30 70.7 70.6 70.5 70.5 70.4 70.3 70.3 70.4 70.3 70.3 70.2 70.1 70.1 70.2 70.3 70.5 70.9 71.1 71.2 71.2 71.4 71.5 71.5 71.5 70.7 MONTHLY AVERACE 68.1

TABLE 3.2-7 AVERACE HOURLY TEMPER ATURE IN *F VESMONT Y4hKEE S AMPLE STATION NO. 7 JULY 1981 DAILY DAY HOUR AVERACE 1

2 3

4 5

6 7

8 9

to 11 12 13 14 15 16 17 18 19 20 21 22 23 24 a.s I

71.6 71.5 71.5 71.5 71.4 71.5 71.5 78.4 71.5 71.5 71.6 71.5 71.4 si.5 71.5 71.7' 72.0 72.3 72.4 72.5 72.5 72.5 72.5 72.5 78.8 2

72.5 72.4 72.4 72.4 72.4 72.4 72.4 72.4 72.4 72.4 72.2 72.1 72.0 72.0 72.1 72.3 72.6 73.1 73.3 73.4 73.4 73.4 73.3 73.2 72.6 3

73.1 73.0 73.0 73.0 72.9 72.9 72.9 72.9 72.9 72.9 72.9 72.9 72.8 72.8 72.8 72.8 72.9 72.9 72.9 73.0 73.0 73.2 73.3 73.1 73.0 4

73.2 73.1 73.5 73.2 73.2 73.1 73.1 73.3 13.1 13,7 73.2 73.1 73.5 73.7 73.6 73.6 73,6 73.5 73.4 73.4 73.5 73.6 73.7 73.6 73.4 5

73.9 73.7 73.4 73.6 73.6 73.6 73.6 73.5 73.5 73.5 73.6 73.3 73.4 73.4 73.3 73.3 73.3 73.2 73.1 73.1 73.3 73.6 73.7 73.5 73.5 6

73.6 73.6 73.6 73.5 73.4 73.5 73.5 73.6 73.6 73.6 73.6 73.7 73.6 73.4 73.4 73.5 73.6 73.6 73.8 73.9 74.0 74.0 74.0 74.1 73.7 7

74.1 74.1 74.0 74.0 74.0 74.0 74.0 74.0 74.1 74.1 74.0 73.9 73.9 74.0 74.6 7=.7 74.8 74.8 74.8 74.8 74.8 74.8 74.9 74.8 74.3 8

74.8 74.8 74.7 74,7 74.7 74.7 74.7 74.7 74.7 74.8 74.8 74.8 74.9 75.2 75.5 75.8 76.4 16.5 76.5 76.5 76.3 76.7 76.2 76.2 75.4 9

76.1 76.1 76.0 76.0 76.0 76.0 76.0 76.0 76.0 76.0 76.0 76.1 75.3 76.5 76.9 77.3 77.6 77.5 77.5 77.5 77.6 77.7 77.6 77.6 76.7 10 77.5 77.5 77.5 77.4 77.4 77.4 77.3 77.3 77.3 77.2 77.2 77.2 77.1 77.2 77.6 77.7 77.7 77.7 77.8 77.5 77.6 77.5 77.7 77.8 77.5 g

11 77.5 77.4 77.6 77.5 77.5 77.5 77.4 77.7 77.7 77.8 77.8 77.9 78.0 77.8 77.9 77.7 77.7 77.5 77.6 77.5 77.4 77.5 77.5 77.7 77.6 12 77.6 77.6 77.7 77.6 77.6 77.7 77.9 78.0 78.2 77.9 77.7 77.8 77.7 77.8 77.7 77.6 77.7 77.7 77.8 77.8 78.0 78.1 78.3 78.3 77.8 bJ 13 78.3 78.2 78.2 78.2 78.1 77.9 77.9 77.9 78.1 78.2 79.0 79.I 79.0 78.9 79.I 79.4 79.6 79.7 79.6 79.5 79.5 79.4 79.3 79.2 78.8 14 79.1 79.0 79.0 78.9 78.9 78.9 78.9 78.9 78.9 79.0 79.1 79.1 79.0 78.8 78.8 78.8 78.7 73.6 78.3 78.2 78.1 78.8 78.0 78.0 78.7 15 77.9 77.8 77.8 77.8 77.8 77.7 77.7 77.7 77.8 77.8 77.9 77.9 77.7 77.7 77.8 77.8 77.8 77.9 77.8 77.8 77.6 77.5 77.5 77.5 77.8 16 77.4 77.3 77.1 77.1 76.9 76.8 76.7 76.7 76.8 76.7 76.7 76.8 76.7 76.6 76.7 76.9 77.0 76.8 76.8 76.7 76.7 76.9 76.9 75.8 76.9 17 76.8 76.9 77.0 76.8 77.0 77.8 77.2 77.8 77.2 77.1 77.0 76.9 77.0 76.9 77.0 76.8 76.7 76.6 76.7 76.7 76.6 76.5 76.7 76.6 76.9 18 76.6 76.6 76.6 76.6 76.6 76.6 76.7 76.8 76.8 76.7 76.7 76.7 76.7 76.8 76.7 76.6 76.5 76.5 76.5 76.5 76.5 76.5 76.4 76.4 76.6 19 76.4 76.4 76.4 76.3 76.4 76.4 76.5 76.5 76.6 76.4 76.6 76.6 76.6 76.6 76.5 76.5 76.5 76.3 76.2 76.2 76.3 76.2 76.2 76.2 76.4 20 76.1 76.8 76.1 76.2 76.4 76.2 76.3 76.2 76.1 76.4 76.6 76.8 77.1 77.5 77.3 77.4 77.4 77.3 77.2 77.0 77.0 76.9 76.9 76.9 76.7 21 76.9 76.9 76.9 76.8 76.8 76.7 76.7 76.7 76.8 76.7 76.6 76.5 76.3 76.4 76.4 76.4 76.6 76.8 7b.9 76.9 76.8 76.8 76.8 76.7 76.7 22 76.6 76.7 76.6 76.5 76.5 76.4 76.4 76.4 76.4 76.3 76.3 76.3 76.3 76.3 76.4 76.7 76.9 76.8 76.9 76.8 76.6 76.5 76.5 76.4 76.5 23 76.3 76.3 76.3 76.1 76.2 76.1 76.0 75.9 76.0 76.0 76.0 76.1 75.9 75.6 75.5 75.6 75.8 76.0 76.2 76.3 76.0 75.8 75.8 75.7 76.0 24 75.6 75.5 75.5 75.4 75.4 75.2 75.2 75.2 75.3 75.3 75.2 75.4 75.5 75.3 75.I 75.0 75.1 75.0 75.0 74.9 75.0 74.9 75.0 75.0 75.2 25 75.0 74.9 75.0 74.9 74.9 75.0 75.0 75.3 75.3 75.2 75.3 75.4 75.4 75.3 75.4 75.I 75.2 75.3 75.3 75.4 75.4 75.3 75.3 75.2 75.2 26 75.1 75.1 75.1 75.2 75.2 75.3 75.4 75.2 75.1 75.2 75.4 75.5 75.6 75.6 15.4 75.4 75.3 75.3 75.4 75.4 75.4 75.5 75.5 75.5 75.3 27 75.5 75.5 75.4 75.4 75.4 75.5 75.5 75.5 75.6 75.5 75.6 75.6 73.6 75.7 75.8 75.9 75.9 76.0 76.1 76.2 76.1 16.1 76.1 76.0 75.7 28 76.0 75.9 75.9 75.8 75.8 75.8 75.8 75.8 75.8 75.9 75.9 75.9 75.8 75.7 75.7 76.0 76.2 76.2 76.1 76.0 75.9 75.9 75.7 75.7 75.9 29 75.6 75.5 75.5 75.4 75.4 75.3 75.3 75.3 75.3 75.4 75.3 75.3 75.2 75.1 75.0 74.9 75.0 75.0 75.1 75.2 75.1 75.0 74.9 74.7 75.2 30 74.5 74.4 74.3 74.2 74.1 74.1 73.9 73.7 73.6 73.4 73.3 73.4 73.5 73.7 73.7 73.7 73.7 73.6 73.4 73.3 73.3 73.2 73.1 73.2 73.7 31 73.3 73.4 73.4 73.4 73.3 13.2 73.1 73.1 73.0 73.0 73.0 73.0 72.9 72.8 72.9 73.1 73.2 73.3 73.5 73.8 73.9 74.0 74.0 74.0 73.3 MON'HLY AVERACE 75.6 M

M M

O O

O

.O.

P TABLE 3.2-8 4VERACE HOU8LY TEMPERATU8E IN 'F VER*t0NT YANFEE SAMPLE STATION NO. 7 AUGUST 1981 DAILY DAY HDbt AVE RACE 1

2 3

4 5

6 7

8 9

to 11 12 13 14 15 16 17 18 19 20 28 - 22 23 24 1

74.0 73.9 73.8 73.8 73.1 73.6 73.6 73.6 73.6 73.5 73.4 73.2 73.0 73.0 72.9 72.9 72.9 73.0 73.0 73.0 73.0 '73.3 73.3 73.3 73.3 2

73.5 73.4 73.2 73.1 73.2 73.2 73.1 73.1 73.1 73.1 73.0 73.0 72.9 72.9 72.9 72.9 72.9 72.8 72.8 72.9 73.1 73.1 73.1 73.1 73.1 1-3 73.1 73.0 72.9 72.9 73.0 72.9 72.9 72.9 72.9 73.0 73.4 73.8 73.8 73.7 73.8 73.8 74.0 74.3 74.4 74.4 74.3 74.2 74.2 74.1 73.6 4

74.0 74.0 74.0 73.9 73.9 73.8 73.8 73.8 73.8 73.8 73.8 73.8 73.8 73.8 73.8 73.9 74.0 74.1 74.3 74.2 74.0 74.2 74.6 74.5 74.0 5

74.3 74.2 74.1 74.2 74.2 74.3 74.1 74.0 73.9 74.3 74.5 74.8 74.7 74.7 74.8 74.8 74.8 75.1 75.4 75.5 75.5 75.5 75.5 75.3 74.7 6

75.3 75.2 75.1 75.1 75.0 74.9 74.s 74.8 74.9 74.8 74.7 74.6 74.5 75.0 75.I 75.4 75.6 75.7 75.7 71.8 75.7 75.5 75.3 75.2 75.2 7

75.2 75.1 75.2 75.2 75.2 75.2 75.1 75.2 75.3 75.5 75.6 75.5 75.4 75.4 75.4 75.4 75.5 75.9 76.0 76.0 76.0 75.8 75.6 75.4 75.5 8

75.3 75.3 75.2 75.2 75.2 75.2 75.1 75.1 75.1 75.2 75.2 75.2 75.1 75.1 75.2 75.3 75.3 75.4 75.3 75.3 75.2 75.1 75.7 75.0 75.2 9

75.0 72.0 74.9 74.9 74.9 74.9 74.9 74.9 74.9 74.9 75.0 75.1 75.0 75.0 75.0 74.9 74.9 74.9 74.9 74.9 74.8 74.7 74.7 74.6 74.9 10 74.4 74.3 74.2 74.1 74.1 74.0 74.0 74.0 74.0 74.1 74.I 14.1 74.1 74.2 74.3 74.4 74.4 74.5 74.5 74.2 74.0 73.9 73.8 73.7 74.1 8

11 73.7 73.6 73.6 73.6 73.5 73.5 73.5 73.5 73.6 73.7 73.8 73.8 73.8 74.0 74.2 74.4 74.6 74.7 74.6 74.5 74.5 74.5 74.6 74.8 74.0 (j

12 74.9 74.9 74.9 74.J 74.8 74.8 74.7 74.7 74.7 7%.8 74.8 74.7 74.6 74,7 74.8 75.2 75.4 75.3 75.2 75.2 7!.1 75.I 75.2 75.4 74.9 g

13 75.5 75.4 75.3 75.3 75.3 75.3 75.3 75.5 75.6 75.7 75.8 75.8 75.7 75.8 75.8 75.9 75.9 75.9 75.8 75.7 15.5 75.4 75.3 75.3 75.6 14 75.2 75.1 75.1 75.1 75.1 75.0 75.0 75.2 75.5 75.8 75.9 75.6 75.5 75.6 75.6 75.6 75.6 75.5 75.4 75.2 75.1 75.0 74.8 74.7 75.3 15 74.7 74.6 74.5 74.5 74.5 74.5 74.5 74.5 74.4 74.4 74.5 74.6 74.6 74.6 74.6 74.6 74.5 74.4 76.2 74.1 74.0 73.8 73.6 73,5 74.4 16 73.4 73.3 73.3 73.3 73.2 73.2 73.2 73.2 73.2 73.3 73.4 73.5 73.6 73.8 74.0 74.1 73.9 73.7 73.3 73.1 73.0 72.8 72.7 72.6 73.3 17 72.4 72.4 72.2 72.0 71.9 71.8 78.7 71.7 71.7 71.8 71.7 71.7 71.7 71.7 71.7 71.7 71.6 71.6 71.4 71.2 71.0 70.7 70.6 70.3 71.6 18 70.2 70.1 70.0 49.8 69.7 69.5 69.3 69.0 68.9 68.8 68.7 68.6 68.6 68.6 68.6 68.6 68.5 68.6 68.5 68.4 68.3 68.1 68.I 68.1 68.9 19 68.I 68.1 68.2 68.2 68.1 68.0 67.9 67.8 67.6 e7.4 67.3 67.2 67.3 67.4 67.5 67.6 67.7 67.7 67.6 67.6 67.5 67.4 67.4 67.3 67.7 20 67.3 67.3 67.3 67.2 67.2 67.2 67.1 67.0 66.9 66.7 66.6 66.5 66.5 66.5 66.6 66.6 66.4 66.9 66.9 66.9 66.8 66.7 66.6 66.5 66.9 21 M.4 M.3 M.2 4.1 M.0 65.9 65.9 65.9 66.0 M.2 66.4 M.5 M.6 M.7 M.8 66.8 66.9 66.9 66.9 66.9 M.7 M.7 66.6 M.7 M.5 22 66.7 66.7 66.6 66.6 66.6 66.7 66.7 66.8 66.9 67.1 67.3 67.4 67.6 67.7 67.9 68.0 68.0 68.1 68.1 68.1 68.0 68.0 68.0 68.0 67.4 23 68.0 68.0 68.0 68.0 68.0 68.0 67.9 67.9 67.9 67.9 67.9 67.9 67.9 67.8 67.8 67.8 67.8 67.7 67.7 67.8 67.9 67.9 68.3 68.5 67.9 24 68.6 6d.6 68.5 68.4 68.5 68.6 68.6 68.6 68.7 68.7 68.8 68.6 68.6 68.9 69.1 69.0 69.3 69.4 69.3 69.3 69.2 69.1 69.1 69.0 68.9 25 69.0 69.0 69.0 68.9 69.0 68.9 68.9 69.0 69.0 69.0 69.1 69.1 69.2 69.4 69.7 70,0 70.1 70.0 69.9 69.7 69.6 69.3 69.3 69.3 69.3 26 69.1 19.2 69.2 69.2 69.2 69.1 69.1 69.1 69.0 69.0 68.9 68.9 68.9 69.0 69.I 69.2 69.4 69.4 69.5 69.6 69.6 69.6 69.6 69.6 69.2 27 69.6 69.5 69.5 69.4 6).4 39.4 69.4 69.3 69.3 69.4 69.4 69.3 69.2 69.2 69.2 69.3 69.3 69.5 69.6 69.6 69.6 69.6 69.5 69.4 69.4 28 69.3 69.2 69.2 69.1 69.1 69.0 69.0 68.9 69.0 69.0 69.2 69.3 69.8 C9.3 69.4 69.6 69.7 69.7 69.8 69.9 69.9 69.8 69.8 69.6 69.4 29 69.4 69.4 69.3 69.2 69.1 69.1 69.1 69.1 69.1 69.1 69.0 69.1 69.I 69.1 69.1 69.1 69.1 69.1 69.1 69.1 69.2 69.3 69.3 69.3 69.2 30 69.3 69.2 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.4 69.3 69.3 69.2 69.3 59.3 69.3 69.3 69.4 31 69.2 69.2 69.1 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.3 69.3 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.1 69.2 MONTHLT AVERACE 71.7

s TABLE 3.2-9 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE STATION NO. 7 SEPTEMBER 1981 DAILY DAY HOUR AVERACE 1

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 5

69.2 69.2 69.2 69.2 69.2 69.1 69.1 69.1 69.2 69.3 69.5 69.5 69.5 69.5 69.5 69.6 69.6 69.7 69.8 69.8 69.8 69.8 69.8 69.8 69.5 2

69.8 69.8 69.8 69.7 69.7 69.7 69.6 69.6 69.5 69.5 69.4 69.3 69.3 69.3 69.4 69.5 69.7 69.8 69.8 69.7 69.6 69.5 69.5 6',4 69.6 3

69.4 69.4 69.4 69.3 69.3 69.3 69.3 69.3 69.3 69.3 69.4 69.4 69.4 69.4 69.4 65.5 69.6 69.5 69.4 69.4 69.4 69.3 69.3 69.3 69.4 4

69.2 69.2 69.2 69.2 69.1 69.1 69.1 49.1 69.1 69.2 69.2 69.2 69.1 69.1 69.1 69.1 69.2 69.2 69.3 69.4 69.5 69.7 69.5 69.4 69.2 5

69.4 69.6 69.6 69.5 69.5 69.5 69.4 69.4 69.4 69.5 69.5 69.4 69.5 69.3 69.3 69.1 69.1 69.1 69.0 69.0 69.0 69.0 69.0 69.0 69.3 6

69.0 69.0 69.1 69.'l 69.0 69.1 60.1 69.1 69.1 69.1 69.1 69.1 69.1 69.I 69.1 69.1 69.1 69.0 69.0 68.9 68.9 69.0 69.0 69.0 69.0 7

69.0 69.0 69.0 69.0 69.1 69.0 69.0 69.0 69.0 69.0 69.1 69.2 69.2 69.2 69.2 69.3 69.3 69.3 69.3 69.3 69.4 69.5 69.5 69.4 69.2 8

69.3 69.3 69.1 69.3 69.3 69.1 69.3 69.3 69.2 59.2 69.2 69.2 69.2 69.2 69.2 69.1 69.1 69.1 69.2 69.1 69.1 69.1 69.1 69.0 69.2 9

69.0 68.9 68.9 68.9 68.8 68.9 68.8 68.8 68.8 68.9 68.9 68.9 68.8 68.9 68.9 69.0 69.1 69.2 69.4 69.4 69.3 69.2 69.1 69.0 69.0 10 68.9 63.9 68.9 68.8 68.8 68.7 68.7 68.7 68.8 68.8 68.9 68.8 68.7 68.7 68.7 68.7 68.7 68.6 68.5 68.4 68.4 68.s 68.3 68.3 68.7 3

68.2 68.2 68.2 68.1 68.1 68.0 67.9 67.9 67.9 67.9 67.8 67.8 68.0 68.1 68.0 68.2 68.3 68.3 68.3 68.3 68.2 68.1 68.1 68,0 68.1 Sh 12 67.9 67.9 67.9 67.9 67.9 67.9 67.9 67.9 67.9 68.0 68.0 68,0 68.1 88.2 68.2 68.3 68.3 68.3 68.3 68.3 68.3 68.3 68.3 68.2 68.1 13 68.2 68.1 68.1 68.0 b8.0 67.9 67.8 67.E 67.8 67.7 67.7 67.7 67.7 67.7 67.6 67.6 67.5 67.5 67.5 67.5 67.4 67.5 67.6 67.7 67.7 14 67.7 67.5 67.5 67.5 67.5 67.6 67.6 o7.6 67.8 67.9 68,0 68.0 68.0 68.1 68.2 68.3 68.6 69.1 69.3 69.3 69.3 69.2 69.2 65.0 68.2 15 68.9 68.8 68.7 68.7 68.7 68.6 68.6 68.6 68.6 68.6 68.6 68.6 68.6 68.6 68.7 68.8 68.8 66.8 68.7 68.6 68.6 68.6 68.6 68.5 68.7 16 68.3 68.1 68.0 67.9 67.8 67.7 67.7 67.6 67.6 67.6 67.6 67.6 67.5 67.4 67.4 67.4 67.4 67.3 67.3 67.2 67.1 07.0 66.9 66.8 67.5 17 66.8 66.7 66.6 66.6 66.6 66.5 66.4 66.4 66.4 66.5 66.5 66.5 6(.5 66.5 66.6 66.6 66.6 66.6 66.6 66.6 66.6 66.7 66.8 66.7 66.6 18 66.7 66.7 66.7 66.7 66.7 66.7 66,5 66.6 66.6 66.7 66.7 66.7 66.7 66.7 66.7 66.6 66.6 66.6 66.5 6f.5 66.5 66.5 66.5 66.5 66.6 19 66.4 66.4 66.4 66.4 66.3 66.2 66.2 66.2 66.7 66.2 66.2 66.2 66.2 66.1 66.1 66.0 66.0 66.0 65.9 65.8 65,7 65.5 65.5 65.4 66.1 20 65.3 65.3 65.3 65.3 65.2 65.2 65.1 65.1 65.1 65.1 65.2 65<2 65.2 65.2 65.2 65.3 65.2 65.1 65.1 65.4 65.3 65.3 65.2 65.1 65.2 21 65.1 65.0 65.0 64.9 64.8 64.7 64.7 64.6 64.6 64.6 64.6 64.5 64.4 64.5 64.7 64.9 65.0 65.0 65.0 65.1 65.1 65.1 65.0 65.0 64.8 22 64.9 64.9 64.8 64.7 64.7 64.6 64.5 64.5 64.4 64.4 64.2 64.1 63.9 63.9 63.9 63.8 63.8 63.7 63.6 63.5 63.5 63.4 63.4 63.3 64.1 23 63.2 63.1 63.0 62.9 63.0 13.0 62.9 62.7 62.4 62.2 62.1 62,0 62.0 61.8 61.6 61.4 61.I 60.9 60.8 60.7 60.8 60.9 60.9 60.7 61.9 24 60.4 60.3 60.3 60.3 60.1 59.7 59.1 58.5 58.0 57.7 57.6 57.6 57.7 57.6 57.6 57.5 57.3 57.2 57.0 56.9 56.8 56.6 56.4 56.2 58.1 25 56.0 55.8 55.7 55.5 55.3 55.2 55.0 54.8 54.7 54.7 54.8 54.9 55.1 55.3 55.5 55.5 55.6 55.6 55.5 55.5 55.5 55.5 55.5 55.5 55.3 26 55.4 55.3 55.2 55.0 54.9 54.8 54.7 54.6 54.7 54.7 54.8 54.9 55.0 55.1 55.2 55.3 55.5 55.5 55.6 55.7 55.7 55.7 55.7 55.7 55.2 27 55.7 55.6 55.6 55.5 55.2 55.4 55.3 55.3 55.3 55.3 55.3 55.5 55.8 56.1 56.4 56.6 56.7 56.8 57.0 57.1 57.2 57.3 57.4 57.5 56.1 28 57.5 57.6 57.6 57.6 57.6 57.7 57.7 57.8 57.8 57.8 57.9 57.9 57.9 57.9 57.9 57.9 57.9 57.9 57.9 $7.8 57.9 57.9 57.9 57.8 57.8 29 57.8 57.8 57.8 57.8 57.8 57.9 57.9 57.8 57.8 57.9 57.9 58.1 58.2 58.3 58.4 58.5 58.5 58.4 58.2 58.1 58.0 58.0 57.9 57.8 58.0 30 57.7 57.7 57.6 57.6 57.5 57.4 57.3 57.2 57.0 57.0

'6.9 56.9 57.0 57.0 57.0 56.9 56.9 56.8 54.6 56.5 56.4 56.3 56.2 56.1 57.0 l

MONTHLY AVERAGE 65.1 l

l m

l R

l C

C C

.C C

C C

C C'

C C

C

_C I

TABLE 3.2-10 AVERACE HOURLY TEMPERATURE IN *1f VERMONT YANKEF SAMPLE STATION NO. 7-OCTOBER 1988 DAILY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

to il 12 13 14 15 16 17 18 19 20 21 22 23 24 1

56.0 55.9 55.9 55.8 55.8 55.8 55.9 55.8 55.8 55.8 55.7 55.7 55.6 55.5 55.5 55.4 55.3 55.2 55.1 55.0 54.9 %8 %.7 54.6 55.5 2

54.6 54.5 %.4 %.3 M.3 54.2 %.2 %2 %.2 54.2 54.3 54.3 %.4 %.4 54.4 %.4 M.4 %.4 54.2 54.2 %.I %.I %.I 54.0

%.3 3

%.o %.0 53.9 53.9 53.8 53.7 53.7 53.7 53.6 53.6 53.8 53.6 53.5 53.5 53.5 53.5 53.4 53.3 53.1 53.0 52.9 52.8 52.8 52.7 53.5 4

52.7 52.7 52.7 52.7 52.7 52.7 52.7 52.7 52.7 52.7 52.7 52.8 52.8 52.9 52.9 53.0 53.0 52.9 52.9 52.8 52.8 52.8 52.8 52.8 52.8 5

52.8 52.8 52.8 52.8 52.8 52.7 52.6 52.6 52.6 52.6 52.7 52.7 52.7 52.7 52.8 52.8 52.8 52.7 32.6 52.6 52.5 52.5 52.5 52.5 52.7 6

52.5 52.5 52.4 52.4 52.3 52.2 52.I 52.0 52.0 51.8 51.9 51.8 51.8 51.8 51.8 51.7 51.7 51.6 51.5 51.4 51.4 51.3 51.3 51.2 51.8 7

51.2 51.2 51.3 St.3 St.4 51.4 51.4 58.5 51.5 51.6 51.6 51.7 51.8 51.8 51.8 51.8 51.8 51.7 51.6 51.5 51.5 51.4 51.4 51.4 51.5 8

51.4 51.4 51.6 51.4 $1.5 St.5 51.5 51.6 51.6 51.8 51.8 51.9 52.0 52.0 52.0 51.9 51.8 51.7 51.6 51.5 51.5 St.5 51.5 51.5 51.6 9

51.5 58.5 51.5 51.5 51.5 51.5 55.4 51.4 51.3 51.3 51.3 51.3 51.4 51.4 51.5 51.5 31.5 St.3 51.3 51.1 51.0 50.8 50.7 50.6 51.3 to 50.6 50.5 50.4 50.3 50.3 50.2 50.1 50.0 50.0 50.1 50.2 50.3 50.4 50.4 50.5 50.5 50.5 50.5 50.4 50.4 50.4 50.3 50.2 50.1 50.3 11 48.9 49.7 49.6 49.6 49.5 49.5 49.4 49.4 49.4 49.5 49.6 49.7 50.0 50.2 %4 50.4 50.5 50.4 50.4 50.3 50.2 50.2 50.2 50.0 49.9

[

12 49.9 49.8 49.8 49.8 49.6 49,5 49.4 49.4 49.3 49.4 49.3 49.1 49.2 49.3 49.4 49.5 49.6 49.6 49.7 49.8 49.8 49.9 50.1 50.2 49.6 m

I3 50.2 50.2 50.2 50.I 50.2 50.I 50.0 50.0 50.I 50.I 50 t 50.0 50 ! 50.0 49.9 49.9 50.! 50.I 50 t 50.1 50.I 50.1 50.0 50.0 50.I i

14 50.0 49.9 49.8 49.7 49.6 49.5 49.5 49.4 49.4 49.6 49.7 49.8 49.8 49.8 49.8 50.0 50.2 50.3 50.3 50.3 50.2 50.1 50.0 49.8 49.9 15 49.7 49.6 49.5 49.5 49.5 49.4 49.3 49.2 49.1 49.1 49.0 49.0 49.0 49.1 49.4 49.6 49.7 49.8 49.9 49.9 50.0 50.0 50.0 50.0 49.5 16 50.0 49.9 49.9 49.8 49.9 49.7 49.8 49.7 49.7 49.7 49.7 49.7 49.7 49.9 49.8 49.9 49.9 49.9 49.9 50.0 50.1 50.1 50.1 50.1 49.9 17 50.1 50.0 50.0 50.0 50.0 49.9 49.9 49.9 49.9 49.8 49.8 49.8 49.8 49.8 50.0 50.0 50.0 50.1 50.0 50.0 50.0 50.0 50.0 50.0 50.0 18 49.9 49.9 49.9 49.9 49.8 49.7 49.7 49.6 49.4 49.5 49.5 49.4 49.3 49.3 49.3 49.3 49.3 49.2 49.2 49.3 49.3 49.3 49.4 49.5 49.5 19 49.5 49.5 49.4 49.4 49.4 49.4 49.3 49.3 49.2 49.2 49.1 49.0 49.0 48.9 48.9 48.9 48.8 48.8 48.7 48.7 42.7 44.7 48.7 48.7 49.0 20 48.6 48.5 48.4 48.3 48.2 48.0 47.9 47.8 47.7 47.8 47.8 47.9 47.9 48.0 48.1 48.1 48.0 48.0 48.0 47.9 47.9 47.9 47.8 47.8 48.0 21 47.7 47.6 47.5 47.5 47.5 47.5 47.5 47.5 47.6 47.7 47.9 48,1 48.2 48.3 48.4 48.4 48.3 48.2 48.1 48.2 48.2 48.2 48.3 48.3 47.9 22 48.4 48.4 48.4 48.3 48.3 48.3 48.3 48.4 48.4 48.4 48.4 48.5 48.6 48.6 48.6 48.6 48.5 48.5 48.5 48.5 48.5 48.7 48.8 48.8 48.5 l

23 48.9 49.0 49.0 49.1 49.1 49.2 49.2 49.3 49.4 49.4 49.5 49.5 49.5 49.4 49.5 49.5 49.4 49.5 49.5 49.5 49.6 49.6 49.6 49.6 49.4 24 49.6 49.6 49.5 49.5 49.4 49.4 49.2 49.2 49.1 49.0 49.0 49.0 49.1 49.I 49.2 49.2 49.1 49.0 48.9 48.9 48.8 48.7 48.6 48.5 49.1 25 48.4 48.4 48.4 48.4 48.4 48.3 48.2 48.1 48.0 48 I 48.1 48.1 48.2 48.3 48.4 48.4 48.3 48.3 48.2 48.I 48.0 47.9 47.9 47.9 48.2 26 47.8 47.9 47.9 47.9 47.9 47.9 4'.9 47.9 47.8 47.8 47.7 47.7 47.7 47.6 47.6 47.6 47.6 47.5 47.4 47.4 47.4 47.5 47.4 47.4 47.7 27 47.4 47.4 47.5 47.5 47.4 47.5 47.6 47.8 47.9 47.9 47.9 48.0 48.1 48.0 48.1 48.1 48.2 48.2 48.0 48.0 48.0 48.0 48.0 48.0 47.9 28 47.9 48.0 47.9 47.9 47.8 47.8 47.7 47.6 47.4 47.4 47.4 47.5 47.6 47.7 47.8 47.9 47.8 47.9 47.9 47.9 47.9 47.9 47.9 48.0 47.8 29 48.0 48.8 48.1 48,1 48.0 48.0 47.9 47.9 47.9 47.9 47.9 47.9 48.0 48.0 48.1 48.1 48,1 48.0 48.0 47.9 47.8 47.8 47.7 47.7 48.0 30 47.5 47.4 47.3 47.3 47.4 47.3 47.2 47.2 47.1 47.1 47.1 47.1 47.0 47.1 47.0 46.9 46.9 46.8 46.8 46.8 46.8 46.7 4.7 46.6 47.0 31 46.5 M.4 46.4 46.3 46.3 M.2 46.1 46.1 46,0 45.9 45.9 M.0 46.0 46.2 46.4 46.4 M.3 4.3 M.3 4.2 46.3 4.3 4.4 4.4 M.2 MONTHLY AVEllACE 49.9

TABLE 3.2-11 AVERACE HOURLY TEMPERATURE IN *F VERMONT YANKEE SAMPLE CTATION NO. 7 NOVEMBER 1981 DAY DAILY HOUR AVERACE I

2 3

4 5

6 7

8 9

10 Il 12 13 14 15 16 17 18 19 20 21 22 23 24 1

46.3 46.3 46.1 46.0 45.9 45.9 45.9 45.8 45.8 45.8 45.8 45.9 45.9 45.9 46.0 46.0 45.9 45.9 45.9 45.9 45.9 45.9 45.8 45.8 45.9 2

45.7 45.7 45.6 45.5 45.4 45.4 45.4 45.4 45.4 45.4 45.4 45.4 45.4 45.5 45.6 45.7 43.9 45.8 45.8 45.8 45.8 45.7 45.7 45.6 45.6 3

45.5 45.4 45.4 45.4 45.4 45.3 45.4 45.3 45.3 45.2 45.1 45.1 45.0 45.0 45.1 45.1 45.1 45.1 45.1 45.1 45.1 45.1 45.0 44.9 45.2 4

44.9 44.9 44.8 44.8 44.8 44.8 44.7 44.6 44.6 44.6 44.9 44.9 45.0 45.1 45.2 45.1 45.1 45.0 45.1 45.0 44.9 44.9 44.9 44.8 44.9 5

44.8 44.8 44.8 44.8 44.6 44.5 44.4 44.3 44.3 44.4 44.5 44.6 44.7 44.8 44.8 44.8 44.8 44.8 44.7 44.7 44.7 44.8 44.8 44.8 44.7 6

44.7 44.6 44.6 44.6 44.6 44.6 44.6 44.6 44.7 44.8 44.9 45.0 45.0 45.0 45.0 45.0 44.9 44.9 44.8 44.8 44.9 44.9 44.8 44.9 44.8 7

46.9 44.8 44.8 44.8 44.8 44.7 44.7 44.7 44.7 44.6 44.6 44.6 44.6 44.6 44.7 44.6 44.5 44.4 44.3 44.3 44.3 44.2 44.2 44.2 44.6 8

44.1 44.1 44.2 44.1 44.1 44.0 44,0 43.9 43.8 43.9 43.9 43.9 44.1 44.1 44.2 44.1 44,0 44.0 44.0 44.0 43.9 43.9 43.8 43.7 44.0 l

9 43.7 43.6 43.5 43.5 43.5 43.5 43.5 43.6 43.6 43.7 43.7 43.7 43.8 43.8 43.7 43.6 43.5 43.3 43.2 43.1 43.0 42.9 42.8 42.8 43.4 10 42.7 42.6 42.6 42.6 42.5 42.5 42.5 42.4 42.4 42.4 42.5 42.5 42.6 42.7 42.6 42.6 42.6 42.6 42.5 42.5 42.5 42.5 42.5 42.4 42.5 g

11 42.4 42.3 42.2 42.2 42.2 42.2 42.2 42.2 42.2 42.2 42.2 42.3 42.4 42.5 42.5 42.5 42.4 42.3 42.3 42.2 42.2 42.1 42.1 42.0 42.3 12 42,0 42.0 41.9 41.8 41.7 41.7 41.6 41.6 41.6 41.7 41.8 41.9 42.0 42,0 41.9 41.8 41.9 41.8 41.7 41.6 41.4 41.3 41.3 41.2 41.7 13 41.1 40.9 40.8 40.7 40.5 40.5 40.5 40.4 40.5 40.6 40.8 40.9 41.1 41.3 41.3 41.3 41.3 41.1 41.0 40.8 40.4 40.5 40.4 40.3 40.8 j

14 40.3 40.3 40.2 40.1 40.1 40.0 40.0 40.0 39.9 40.1 40.2 40.4 40.6 40.7 40.7 40.7 40.6 40.6 40.6 40.6 40.6 40.6 40.5 40.5 40.4 l

15 40.4 40.4 40.3 40.2 40.2 40.1 40.1 40.1 40.0 40.0 40.0 40.1 40.2 40.3 40.4 40.4 40.5 40.5 40.6 40.6 40.6 40.6 40.6 40.6 40.3 16 40.5 40.5 40.5 40.5 40.5 40.5 40.5 40.5 40.5 40.6 40.6 40.7 40.7 40.8 40.9 40.9 40.9 40.9 40.9 40.9 40.9 40.8 40.8 40.8 40.7 i

17 40.8 40.8 40.8 40.8 40.8 40.9 40.9 41.0 41.0 41.1 41.2 41.3 41.4 41.5 41.6 41.6 41.6 41.7 41.7 41.7 41.7 41.7 41.7 41.7 41.3 18 41.8 41.9 41.9 42.0 42.0 42.0 42.0 42,0 42.1 42.1 42.2 42.2 42.3 42.3 42.4 42.4 42.3 42.3 42.2 42.3 42.3 42.2 42.3 42.3 42.2 19 42.2 42.2 42.2 42.2 42.1 42.1 42.1 42.1 42.0 42.1 42.2 42.4 42.5 42.6 42.6 42.6 42.6 42.6 42.5 42.6 42.6 42.6 42.7 42.7 42.4 20 42.8 42.8 42.8 42.9 42.9 42.9 43.0 43.0 43.0 43.0 43.0 43.0 43.0 42.9 42.9 42.8 42.8 42.7 42.7 42.7 42.7 47.7 42.7 42.7 42.8 l

21 42.7 42.7 42.7 42.7 42.6 42.6 42.6 42.6 42.5 42.6 42.6 42.6 42.6 42.6 42.6 42.6 42.6 42.5 42.4 42.4 42.3 42.3 42.3 42.3 42.5 22 42.3 42.3 42.3 42.3 42.3 42.3 42.3 42.3 42.2 42.2 42.3 42.3 42.4 42.4 42.4 42.4 42.3 42.3 42.2 42.2 42.1 42.I 42.0 42.042.3 23 41.9 41.8 41.7 41.7 41.7 41.6 41.6 41.5 41.3 41.4 41.4 41.3 41.4 41.4 41.3 41.4 41.3 41.2 41.2 41.0 40.9 40.8 40.8 40.741.3 24 40.6 40.5 40.4 40.3 40.2 40.2 40.2 40.1 40.0 40.1 40.1 40.2 40.3 40.3 40.2 40.1 39.9 39.7 39.7 39.7 39.6 39.5 39.5 39.4 40.0 25 39.3 39.1 39.0 38.9 38.8 38.6 38.5 38.4 38.5 38.5 38.6 38.6 38.7 38.7 38.6 38.5 38.4 18.2 39.1 37.9 37.8 37.7 37.6 37.638.4 26 37.5 37.5 37.5 37.5 37.6 37.5 37.6 37.5 37.5 37.6 37.8 37.9 38.0 38.1 38.0 37.9 37.8 37.6 37.4 37.4 37.3 37.2 37.2 37.137.6 27 37.1 37.1 37.1 37.1 37.2 37.2 37.2 37.2 37.2 37.2 37.3 37.3 37.4 37.4 37.5 37.4 37.5 37.4 37.4 37.4 37.4 37.4 37.4 37.4 37.3 28 37.4 37.5 37.4 37.4 37.3 37.4 37.4 37.4 37.5 37.5 37.5 37.5 37.6 37.7 37.8 37.8 37.7 37.7 37.6 37.5 37.5 37.5 37.5 37.5 37.5 29 37.4 37.4 37.4 37.3 37.3 37.2-37.1 37.1 37.1 37.0 37.1 37.1 37.2 37.2 37.2 37.1 36.9 36.8 36.7 36.6 36.6 36.6 36.5 36.5 37.0 30 36.4 36.4 36.4 36.4 36.4 36.3 36.2 36.1 36.0 35.9 35.9 36.0 36.1 36.2 36.2 36.3 36.2 36.0 35.9 35.8 35.8 35.7 35.7 35.6 36.1 MONTHLY AVERACE 41.7 g

g M

M M

M E

TABLE 3.2-12 AVERACE HOURLY TEMPERATUPE IN *F VERMONT YANKEE SAMPl.E STATION NO. 7 DECEMBER 1981 DAILY DAY HOUR AVERACE I

2 3

4 5

6 7

8 9

to 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1

35.6 35.7 35.6 35.6 35.5 35.5 35.4 35.2 35.1 35.0 35.1 35.0 34.9 34.9 34.8 34.8 34.8 34.7 34.8 34.7 34.6 34.6 34.5 34.4 35.0 2

34.4 34.4 34.3 34.3 34.2 34.I 34.2 34.2 34.1 34.2 %.3 34.3 34.4 34.5 34.5 %.6 34.6 34.5 34.5 34.5 34.5 34.6 34.6 34.5 34.4 3

%.6 34.5 %.5 34.5 34.6 34.5 34.5 34.5 34.5 34.6 %.6 34.7 34.8 34.8 %.8 34.9 34.9 34.9 35.0 35.0 35.0 35.0 35.0 34.9 34.7 4

34.9 34.9 34.8 34.7 34.7 34.6 34.6 34.5 34.5 34.6 3=.6 34.8 34.9 35.0 35.1 35.1 35.1 35.1 35.1 35.1 35.2 35.2 35.3 35.3 34.9 5

35.3 35.3 35.2 35.3 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.3 35.3 35.3 35.3 35.4 35.4 35.4 35.5 35.5 35.4 35.4 35.4 35.3 6

35.3 35.2 35.2 35.1 35.1 35.1 35.0 %.9 34.8 34.7 34.7 34.6 34.6 %6 M.5 %.4 34.4 %.3 34.3 34.3 34.2 34.1 34.1 33.9 34.6 7

33.9 33.8 33.8 33.8 33.7 33.7 33.6 33.6 33.6 33.6 33.7 33.8 33.8 33.9 33.9 33.9 33.8 13.8 33.7 33.7 33.6 33.6 33.6 33.5 33.7 8

33.5 33.4 33.4 33.4 33.3 33.3 33.3 33.2 33.3 31.2 33.2 33.3 33.4 33.5 33.5 33.5 33.5 33.5 33.5 33.4 33.4 33.3 33.2 33.1 33.4 9

33.1 33.0 32.9 32.9 32.9 32.9 32.8 12.8 32.7 32.6 32.6 32.7 32.7 32.7 32.8 32.7 32.7 32.7 32.7 32.6 32.6 32.6 32.6 32.6 32.7 10 32.6 32.6 32.7 32.6 32.6 32.6 32.5 32.6 32.5 32.6 32.6 32.7 32.8 32.9 33.0 33.0 32.9 32.9 32.9 32.8 32.8 32.8 32.8 32.8 32.7 I

11 32.8 32.8 32.8 32.8 32.8 32.7 32.6 32.6 32.5 32.5 32.5 32,7 32.8 32.9 33.0 33.0 32.9 32.8 32.7 32.7 32.7 32.7 32.7 32.6 32.7 12 32.5 32.4 32.4 32.4 32.3 32.3 32.3 32.3 32.3 32.3 32.4 32.5 32.6 32.7 32.7 32.8 32.8 32.8 32.9 32.9 32.9 32.8 32.8 32.7 32.6 g

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e e o e e o e o e o e e e e e o e e e o e e e o e e e o e o a

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6 6 6

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C00000000000000000000000000000 1 I 6 4 6

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e e e o e e e

e e e o e e e e e o e C00000000000000000000Q00000000e 0 4 4

0 6

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e e e e e o e e o e e e e e e e e e e e o e o e e e e e e C00000000000000000000000000000 t

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6 5 6 6 6 4 8 6 C O - C O O - C C = O N O O O O - O = C O C O - m o - C = =.

c e e o e e e e e e e e e e e e e e e e e o e e e o e e 00CC00000000000000000000000000 6

4 0

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6 6 6 4 6 a c - C a O m = O N O N = = O O O = C O O O O a. =. =eNOCm m

o e e o e e e o e e e e a e e e e o e e e o e

e e e e 000000000000000000000000000000 0

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= m. a. O =eO=O=amO=OOm O===ma mOa=Nmaa N

e e e e e e e o e e o e e e o e e e e e e e e e e C00000000000000000000000000000 i e e e

e a e e e

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e e e e e e e e e e e e e e e e e e e e o e e e e 000000y0000099000y009000y000909 N

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o e e o e e e e e e e e e o e e e o e e e e e e e e e e e o e OOOOOyOOyOOOOOyyOOOyOOycyyOOOOO N

O - O O O O O O = = O = m = C O O O N d N m - O d m O O O O O.

N e e e e e e e e e e e e o e e e e e o e e e e e e e o e e e 000000000y0 N

000000 00000 00000 O = C.O O O O O m = O O N C O. O =eO m d N O c c e = = O. O.O. O.

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e e e e e e o e e e e e e o e e e e e e e e OOOOOOOCyyCOOOOOyoy=OOOOO yOCOO N

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6 e e s e o e d

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e e o e e o e e o e e e e e o e e e e e o e e e e e e e e e e OyOCOOOOOyO=0COOOONOOOOyOoOOONy nom =@=OmH@CmmO==md==NNNONmmOOmm e

e o e e e e e o e e o e o e o e o e e e e e e o e e o e o e e C0000000000NC00000-0C00000000~C e

a e e e a

6 e

COO =NOmmNmOmdemmMMemmH=d=4COONO 4

e e e o e o e o e o e o e e o e e o e e e e o e o e o e e o e

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e o e o e e o e o e e o e e o e e e o e e e e e e e e o e e o COOyOOyyyOOOycyyOOOOOOOOOOOOOOO

=C0=OmOOOeOCH==OmmNONOO=ON=CC=O N

e e e o e e e e e e e e o e e e e o e e o e e o e e e o e o e yOOyOOOOOyOOyOycyyyOyOOOOOyOOOO O. =eOONam.OCmmOOOOOmmOO=mOOOm=Comm

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e e e e e o e e e o e e e e e e o e e e e e e e e e OOOOOyOOQmOOOOOOOOOOyOOOOyOOOyy j

d

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m==m=mmmmmNNNNNNNNNNMM E -.

TABLE 3.5-1 DIFFERENCES IN HOUBLY MEAk TEMPERATURES IN *F BETWEEN MONITOR 3 AND MONITOR 7 JANUARY 1981 DAY HOUR I

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 I

l.2 1.2 1.1 1.1 9.4 1.0 0.9 0.9 0.9 1.0 I.1 1.2 1.4 1.6 1.7 1.8 I.8 2.0 2.2 2.1 2.0 2.0 1.9 1.8 2

1.7 1.6 1.5 1.4 1.2 1.2 1.t 1.3 2.0 2.6 2.6 2.1 1.7 1.5 1.3 1.2 1.2 1.0 0.7 0.5 0.4 0.3 0.2 0.1 3

0.1 0.1 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.2 0.3 0.4 0.5 0.6 0.6 0.7 0.7 0.7 0.8 0.9 1.0 1.1 1.2 I.3 4

I.4 1.6 1.7 1.8 1.9 2.1 2.3 2.4 2.6 2.8 2.9 3.2 3.6 3.9 4.1 4.2 4.4 4.5 4.7 4.9 5.1 5.3 5.4 5.6 5

5.6 5.6 5.5 5.5 5.6 5.6 5.5 5.3 5.5 5.8 5.0 3.8 2.9 2.3 1.9 1.7 1.6 1.5 1.5 1.4 1.3 1.3 I.3 1.2 6

1.2 1.1 1.0 1.0 I.4 1.8 2.2 2.6 3.5 4.0 4.2 4.3 SYSTEM INOPERATIVE 7

SYSTEM INOPERATIVE 6.9 5.8 4.3 3.2 2.8 2.4 2.3 8

2.4 2.4 2.6 3.0 3.1 3.4 3.8 4.2 5.5 6.6 5.5 3.9 3.5 3.3 3.2 3.1 3.3 5.3 4.3 3.1 2.3 2.1 1.7 1.7 9

1.6 1.6 1.8 2.3 2.8 3.3 3.7 4.2 5.8 7.4 5.0 3.6 3.1 2.7 2.6 2.6 2.6 2.6 3.0 3.3 3.6 3.9 4.4 4.8 10 5.2 6.0 6.7 7.2 7.5 7.6 7.5 7.6 7.7 7.8 7.8 8.0 7.9 7.7 7.6 7.3 6.8 6.7 5.8 4.2 3.4 2.7 2.5 2.4 11 2.2 2.1 2.0 2.2 2.6 2.7 3.1 3.5 3.7 4.0 4.7 5.5 6.3 6.4 6.5 6.4 6.3 6.0 5.9 5.9 5.9 6.0 5.8 5.9 12 5.8 5.8 5.9 5.9 6.0 6.2 6.4 6.6 6.9 6.2 5.4 4.5 3.9 3.7 3.5 3.2 3.2 4.5 4.4 3.4 2.9 2.7 2.3 2.3 13 2.4 2.5 2.9 3.4 3.8 4.3 4.6 4.8 6.2 7.4 5.8 4.2 3.7 3.4 3.4 3.2 3.0 3.6 5.7 5.4 4.8 4.4 4.1 3.6 14 3.4 3.3 1.5 3.9 4.3 4.6 4.8 5.0 6.7 7.5 7.9 7.0 5.7 5I 4.7 4.4 4.7 5.1 6.1 5.7 4.4 3.7 3.4 3.1 g

og 15 2.9 2.8 2.8 2.9 3.2 3.5 3.8 4.3 6.2 6.7 7.9 7.3 6.1 5.3 4.8 4.6 4.5 5.4 4.2 3.6 3.4 2.9 2.8 2.8 c) 16 2.7 2.7 2.9 3.4 3.6 4.2 5.0 5.6 6.9 7.6 6.8 5.7 4.7 4.6 4.5 4.3 4.2 4.9 6.5 6.0 4.9 4.6 4.1 4.0 1

17 3.8 3.8 4.0 4.3 4.5 4.2 3.8 3.8 3.7 3.6 3.5 3.6 3.7 3.9 3.9 3.7 3.5 3.6 3.4 3.0 2.8 2.4 2.2 2.1 18 1.9 1.8 1.7 1.4 1.2 0.8 0.8 0.9 1.1 1.2 t.6 2.1 2.8 3.1 3.6 4.2 4.4 4.7 5.4 6.0 5.7 5.4 4.2 4.0 19 3.9 3.9 4.2 4.6 4.7 5.0 5.3 5.4 5.8 6.4 5.9 5.2 4.8 4.7 4.5 4.4 3.8 4.2 5.3 4.9 4.4 4.0 3.9 3.3 20 3.3 3.6 3.7 4.1 4.3 4.7 5.1 5.5 6.5 8.0 7.0 6.5 5.8 5.7 5.5 5.2 4.7 5.2 6.3 5.3 4.6 4.1 3.6 3.3 21 3.3 3.3 3.4 3.6 4.1 4.4 4.7 5.2 5.6 5.9 6.6 7,7 8.2 8.3 8.5 8.6 8.6 8.5 8.2 6.9 5.9 5.4 4.9 4.6 i

27 4.2 3.9 3.8 4.0 4.5 4.9 5.3 5.7 6.5 7.3 7.8 7.8 7.4 7.3 7.1 7.0 6.4 6.2 6.2 7.3 7.6 7.4 7.2 7.1 23 6.5 6.1 5.6 5.4 5.5 5.9 6.2 6.5 7.3 7.9 8.5 8.4 7.6 7.4 7.2 7.1 6.4 6.0 6.3 6.7 5.7 4.6 4.2 4.0 24 3.7 3.4 3.3 3.3 3.6 4.1 4.5 4.9 5.4 6.0 6.7 7.1 7.6 8.2 8.4 8.6 8.7 8.8 9.3 8.9 7.3 7.0 6.7 6.1 25 5.4 5.0 4.6 4.6 4.9 5.1 5.3 5.5 5.6 5.6 5.9 7.2 8.8 9.5 9.9 10.1 10.2 10.1 9.9 9.8 10.3 10.8 10.9 10.6 26 10.2 9.8 9.2 9.0 8.8 8.9 9.3 9.7 9.5 9.8 9.4 7.7 6.9 6.2 5.3 4.9 5.5 5.4 5.1 4.2 3.6 3.0 2.8 2.7 27 2.7 2.7 2.7 2.8 3.I 3.5 4.0 4.6 6.8 7.9 8.2 SYSTEM 'NOPERATIVE 28 SYSTEM INOPERATIVE 8.0 7.7 7.3 7.0 7.2 6.9 6.6 6.8 7.1 8.0 7.9 7.4 7.1 6.3 l

29 6.0 6.1 6.2 6.3 6.5 7.1 7.7 7.7 8.1 8.4 8.5 9.2 9.7 10.0 10.2 10.3 10.3 9.7 9.3 9.2 9.3 9.4 9.4 9.1 1

30 8.7 8.1 7.6 7.3 7.4 7.5 7.7 7.9 8.0 8.1 9.0 9.1 8.9 8.6 8.3 7.5 7.2 7.6 7.6 6.6 5.8 5.5 4.9 4.4 l

31 4.2 3.9 4.0 4.4 4.8 5.2 5.6 6.2 6.6 7.0 7.4 7.7 8.3 8.9 9.5 9.6 9.6 9.7 9.9 9.9 10.0 9.9 9.6 9.0 1

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o e e e e e e e e o e e e e e e o W e o e o e e o e o Md====dNN=MOOOQaa H-COCOOOOO M>

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l MNhh d e. k e. c e m e. @. @e m=N m h e d e e @ @ M.

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o e e e e o e N

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TABLE 3.5-3 DIFFERE."CES IN HOURLY MEAN TEMPERATURES IN *F BETWEEN MONITOR 3 AND MONITOR 7 MARCH 1981 DAY HOUR I

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1

0.8 0.7 0.6 0.7 0.7 0.7 0.8 0.8 0.7 0.5

-0.2

-0.7

-0.8

-0.5 0.2 0.6 0.7 0.7 0.9 1.0 1.1 1.1 I.2 2

1.2 1.1 1.1 1.1 I.3 I.3 I.2 1.1 0.9 0.9 1.0 1.0 1.0 0.9 1.0 0.9 0.9 1.0 1.0 1.1 1.0 1.1 I.0 1.1 3

1.1 1.2 1.2 1.3 1.3 1.3 1.3 1.4 1.2 1.3 1.4 1.1 1.1 1.0 0.9 1.0 1.0 1.0 1.1 1.2 1.3 1.5 1.6 1.5 4

1.7 1.7 1.8 1.7 1.7 1.7 1.4 1.5 1.6 1.6 1.8 1.*

1.8 1.8 1.7 1.7 1.5 1.4 1.0 0.9 1.1 1.1 1.1 1.2 5

1.1 1.0 1.0 1.1 1.3 1.5 I.6 1.6 1.5 1.6 1.7 1.6 1.8 1.9 2.1 2.3 2.7 2.4 2.4 2.3 2.4 2.3 2.2 2.3 6

2.4 2.5 2.5 2.6 2.5 2.5 2.1 2.0 2.0 1.9 1.8 2.0 2.1 2.2 2.3 2.3 2.4 2.3 2.2 2.1 1.9 1.9 1.9 1.8 7

1.8 1.9 I.8 1.9 2.0 1.9 1.9 2.0 h.9 1.8 1.7 2.1 2.2 2.1 1.8 2.0 2.0 2.0 2.0 1.8 1.8 1.6 8.6 1.5 8

l.4 1.3 1.4 1.4 1.5 I.7 1.6 1.7 1.7 1.6 1.6 1.6 1.7 1.7 2.0 2.0 2.0 2.1 2.0 2.0 2.0 1.9 l.8 1.8 9

1.7 1.8 2.1 2.1 2.1 2.2 2.1 2.2 1.8 1.7 t.6 1.6 1.7 1.8 1.8 1.9 1.9 2.0 2.0 2.0 2.1 2.1 2.1 2.1 to 1.9 I.9 1.9 1.8 1.8 1.8 1.8 I7 1.4 1.1 1.1 1.1 1.3 l.3 1.2 1.4 1.6 1.8 1.9 1.8 2.0 I.9 1.9 1.9 1.8 1.8 1.7 1.8 1.7 1.7 1.7 1.7 1.5 1.3 1.3 0.9 0.6 0.9 1.2 1.3 1.5 1.9 1.9 2.2 2.3 2.2 2.3 2.2 12

?.2 2.0 2.4 3.0 3.0 3.I 3.4 3.1 2.8 1.9 1.7 1.5 1.3 I.3 1.7 1.5 I.4 1.7 1.9 1.9 1.9 2.1 2.2 2.2 13 2.2 2.3 2.4 2.6 2.5 2.5 2.4 2.3 2.0 1.6 1.2 1.0 1.2 1.0 1.3 I.5 1.7 2.0 1.9 2.1 2.2 2.3 2.4 2.4 14 2.0 2.3 2.2 2.0 1.9 2.2 1.8 l.6 1.4 0.8 0.1

-0.3

-0.4

-0.3 0.4 1.0 1.1 1.1 1.2 1.4 t.3 1.4 1.5 15 1.6 1.7 1.9 2.1 2.3 2.3 2.3 2.3 2.1 1.7 1.1 0.5 0.7 0.9 0.9 1.2 1.4 1.4 1.4 1.6 1.4 I.4 1.4 1.5 CN bJ 16 1.5 1.5 1.9 2.3 3.0 3.1 3.0 3.4 3.5 1.8 1.3 1.2 0.9 0.7 0.5 0.4 0.7 l.0 1.1 1.4 1.7 1.9 2.2 2.3 8

17 2.8 2.9 3.2 3.3 4.1 4.7 5.1 5.0 A.5 2.9 2.0 1.8 1.4 1.1 1.1 1.2 1.3 1.7 1.5 1.5 1.1 0.7 0.6 0.5 18 0.4 0.3 0.4 0.6 0.8 1.1 1.3 2.0 1.9 1.5 1.0 0.8 0.6 0.5 0.6 0.7 1.0 1.3 1.8 1.6 1.1 1.0 1.1 1.5 19 1.7 2.1 2.7 2.9 2.7 2.7 2.4 1.9 1.8 2.1 2.4 1.6 1.1 1.2 1.5 1.7 1.7 1.7 1.8 1.6 1.4 I.4 1.5 1.6 20 1.8 1.7 l.8 I.8 1.7 1.6 1.6 2.2 4.4 4.2 2.8 2.6 2.4 2.1 I.8 2.0 2.1 2.1 2.0 1.7 1.5 1.5 1.5 1.7 21 1.9 2.I 2.4 2.5 2.4 2.3 2.2 2.5 3.9 5.6 4.2 3.4 2.9 2.7 2.9 3.2 3.6 4.5 4.0 3.1 2.7 2.3 2.3 2.0 22 2.0 2.2 2.0 2.2 2.0 2.3 3.0 3.7 4.3 4.6 5.1 5.3 4.5 3.6 3.1 3.2 3.4 4.1 4.0 3.9 2.9 2.6 2.7 2.5 23 2.9 3.1 3.0 2.8 2.8 2.8 2.8 4.3 5.4 3.4 1.7 0.8 0.9 0.9 1.3 1.4 1.7 1.9 1.9 2.0 1.9 1.9 1.6 1.7 24 1.7 1.7 I.7 1.6 1.5 1.7 2.8 5.1

?.9 5.4 4.8 4.1 3.7 3.3 2.3 1.9 2.2 2.2 2.4 2.6 2.5 2.5 2.2 2.1 25 1.9 1.8 1.8 1.9 2.1 2.2 2.3 3.1 4.6 4.7 4.6 4.5 4.0 3.3 2.6 2.7 2.8 2.9 3.0 2.9 2.8 2.6 2.2 2.0 26 1.7 1.7 1.5 1.6 1.6 1.9 2.7 3.1 2.2 1.9 1.8 1.6 1.3 1.3 1.4 1.3 1.7 1.7 I.7 1.6 1.6 1.4 t.6 1.9 27 1.9 t.9 2.0 2.1 2.2 2.1 2.9 3.6 3.1 2.4 2.1 1.8 1.5 1.2 0.5 0.7 0.8 1.0 1.4 1.5 1.7 1.8 2.1 2.2 28 2.4 2.5 2.7 2.9 3.0 3.1 3.1 2.9 2.5 1.9 1.5 1.2 0.8 0.8 0.9 0.9 1.1 1.5 I.8 2.0 2.0 2.0 2.1 2.3 29 2.5 2.3 2.1 I.8 1.7 I.8 1.5 1.4 1.3 1.0 0.7 0.3 0.4 0.7 1.0 1.1 1.6 1.9 2.1 2.2 2.2 2.1 2.0 2.0 30 2.1 2.0 2.0 1.8 2.1 2.9 1.8 1.2 0.8 0.7 0.7 0.5 0.6 0.8 0.6 0.6 0.8 1.1 1.1 0.9 0.7 0.6 0.7 0.9 31 1.2 1.3 1.6 1.3 1.0 0.7 0.6 0.6 1.0 1.3 1.5 1.5 1.6 1.5 1.3 1.0 tot 1.3 1.3 1.4 1.5 1.5 t.5 1.5

M M

M TABLE 3.5-4 DIFFERENCES IN HOURLY MEAN TEMPERATURES IN 'F BETWEEN MONITOR 3 AND MONITOR 7 APRIL 1981 DAY HOUR I

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 I

1.5 1.5 1.5 1.4 1.4 1.5 1.5 1.4 1.3 1.1 1.0 1.0 1.0 0.8 0.9 0.8 0.7 0.6 0.6 0.5 0.4 0.4 0.4 0.6 2

0.5 0.6 0.6 0.6 0.6 0.6 0.5 0.4 0.4 0.4 0.2

-0.1 0.3 0.6 0.5 0.2 0.0 0.5 0.8 1.0 1.1 1.2 1.2 1.2 3

1.3 1.4 1.5 1.6 1.7 t.7 1.7 1.7 1.5 I.5 1.3 1.0 I.0 0.8 0.6 0.3 0.3 0.4 0.4 0.5 0.4 0.5 0.6 0.6 4

SYSTFM INOPERATIVE 5

SYSTEM INOPERATIVE 6

SYSTEM INOPERATIVE 7

2.0 1.9 1.8 1.7 1.7 1.6 1.5 1.4 1.3 1.4 1.4 1.4 1.2 1.2 1.1 1.0 1.0 1.0 1.1 1.1 1.2 0.9 1.2 1.4 8

1.4 1.5 1.6 1.8 1.9 2.0 2.0 1.9 1.9 1.8 1.5 1.4 1.2 1.1 1.1 1.1 1.2 1.2 1.3 1.4 1.3 1.3

.l.2 1.2 9

1.3 1.2 1.2 1.2 1.2 1.2 I.4 1.6 1.7 I.9 7.1 2.0 1.9 1.9 1.8 1.5 1.4 1.3 1.3 1.2 1.2 1.2 1.3 1.4 10 1.2 1.1 0.9 1.0 1.0 1.1 1.1 1.2 1.4 1.4 1.4 1.4 1.7 1.8 1.9 1.8 1.7 1.7 1.7 1.7 1.5 1.5 1.4 1.5 11 1.5 1.4 1.5 1.3 1.2 1.2 1.2 1.1 1.1 1.3 1.6 1.6 1.6 1.6 1.5 1.5 1.5 1.4 1.3 1.4 1.0 0.8 0.8 0.9 12 1.2 1.4 1.3 1.3 1.4 1.3 1.3 1.1 0.9 0.8 0.7 0.7 0.8 0.9 1.0 1.2 1.3 1.3 1.2 1.2 1.3 1.5 1.5 1.6 13 1.7 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 1.1 1.3 1.2 1,6 1.7 t.7 I.7 1.9 1.8 1.8 1.6 1.5 1.2 1.4 1.6 g

og 14 1.7 I.8 1.9 1.8 1.7 1.7 1.6 I6 1.4 1.4 1.6 1.9 2.1 2.1 2.1 2.3 2.4 2.5 2.5 2.5 2.4 2.2 1.9 1.8 La 15 l.7 4.7 1.4 1.4 1.5 1.7 1.8 I.7 1.5 1.2 1.1 1.1 0.9 0.8 1.1 1.3 1.4 1.5 1.5 1.5 1.4 1.5 1.7 1.7 1

16 1.8 1.8 1.8 1.9 1.8 1.8 I.9 2.0 2.1 t.9 2.0 I.9 2.0 2.3 2.6 2.4 2.1 2.0 1.9 1.9 1.6 1.3 1.2 1.2 17 1.1 0.9 1.0 1.0 0.9 1.0 0.9 0.8 0.9 1.0 1.1 1.3 1.6 1.7 1.8 2.0 2.2 2.3 2.0 2.I 2.2 2.0 1.9 1.8 18 1.8 1.9 1.8 1.5 1.4 1.4 1.4 1.5 1.6 l.6 1.6 1.7 1.6 1.7 1.7 1.7 1.6 1.6 1.7 1.8 1.9 2.0 2.0 2.0 19 8.8 1.8 1.7 I.8

?.0 2.1 2.1 2.4 2.7 2.7 2.7 2.8 2.6 2.6 2.6 2.4 2.4 2.2 1.9 1.7 1.4 1.3 1.2 1.1 20 1.1 1.1 1.2 1.2 1.3 1.5 1.4 1.3 1.3 1.2 1.2 1.4 1.6 1.7 1.8 1.8 1.8 1.7 1.5 1.4 1.4 1.2 1.1 1.0 21 1.2 1.3 1.6 1.7 1.8 1.8 1.8 1.8 1.9 1.9 1.9 2.1 2.5 2.8 2.8 2.5 2.4 2.4 2.2 2.0 1.6 1.4 I.4 1.5 22 1.2 1.2 1.2 1.3 I.4 1.5 1.6 1.8 2.3 2.7 2.8 2.7 2.5 2.4 2.2 2.0 1.7 1.4 1.7 1.6 1.3 1.2 1.2 1.3 23 1.3 1.4 1.2 1.2 1.3 1.2 1.2 1.4 1.7 2.0 2.2 2.3 2.3 2.3 2.0 2.0 2.1 2.2 2.1 2.0 2.0 1.9 1.9 1.8 24 1.6 I.3 1.3 1.3 1.4 1.2 1.1 1.3 1.5 1.7 1.7 1.8 1.9 1.9 1.9 2.2 2.3 2.2 2.1 1.9 1.8 1.7 1.5 1.4 25 1.5 1.5 1.5 1.7 1.8 1.9 2.0 1.9 2.0 2.2 2.3 2.4 2.5 2.5 2.4 2.I 1.8 1.5 1.4 1.4 1.5 1.5 1.5 1.6 26 1.6 1.5 1.6 1.5 1.6 1.7 1.6 1.6 1.5 1.5 1.6 I.6 1.7 t.7 I.8 1.7 1.9 1.9 1.9 1.7 1.5 1.4 1.2 27 1.2 1.2 1.3 1.3 I.3 1.4 1.4 1.4 1.5 1.5 1.6 1.7 1.9 2.0 2.2 2.3 2.0 1.8 1.7 1.6 1.6 1.4 1.3 I.3 28 1.3 l.2 1.1 1.1 1.1 1.1 1.0 0.9 0.9 0.8 0.9 1.1 1.4 1.6 1.9 2.0 2.0 2.1 2.2 2.3 2.2 2.1 2.0 1.9 29 1.9 1.7 1.6 1.6 1.5 1.4 1.3 1.1 0.8 0.5 0.4 0.4 0.3 0.1 0.2 0.3 0.7 0.8 1.0 1.0 1.0 1.1 1.4 1.6 30 1.5 1.4 1.5 1.5 1.5 1.7 1.7 t.6 1.5 1.6 1.5 1.6 1.6 1.4 1.4 1.4 1.8 1.8 1.8 2.0 1.8 1.9 1.7 1.9

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TABLE 3.5-12 DIFFERENCES IN HOURLY MEAN TEMPERATURES IN *F P ET.*EEh MONITOR 3 AND MONITOR 7 DECEMBER 1981 CAY HOUR I

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 1*

19 20 21 22 23 24 1

0.6 0.4 0.7 1.7 2.5 2.3 1.9 1.2 1.4 1.7 2.1 1.8 1.4 0.8 0.8 0.6 0.5 0.5 0.4 0.5 0.6 0.6 0.7 0.8 2

0.7 0.7 0.9 0.9 1.0 1.0 0.9 0.9 1.6 1.0 0.7 0.6 0.5 0.3 0.3 0.3 0.2 0.4 0.5 0.5 0.6 0.6 0.4 0.9 3

0.8 0.9 0.9 0.9 0.9 1.2 1.2 1.4 2.8 1.8 1.3 0.9 0.8 0.8 0.8 0.8 0.8 0.7 0.6 0.7 0.7 0.7 0.7 0.8 4

0.8 0.7 0.7 0.7 0.6 0.8 2.2 1.1 0.8 0.6 0.6 0.4 0.4 0.4 0.4 0.5 0.6 0.6 0.6 0.6 0.5 0.5 0.5 0.6 5

0.8 0.8 1.0 0.7 1.4 2.3 2.6 2.6 2.7 2.3 1.0 0.5 0.3 0.4 0.3 0.3 0.2 0.2 0.2 0.1 0.1 0.2 0.2 0.2 6

0.2 0.4 0.3 0.4 0.3 0.3 0.2 0.3 1.2 0.6 0.3 0.2 0.2 0.3 0.2 0.3 0.2 0.2 0.3 0.2 0.3 0.4 0.3 0,4 7

0.5 0.6 0.5 0.6 0.7 0.9 2.0 1.1 0.7 0.7 0.6 0.6 0.7 0.7 0.9 1.0 1.1 1.1 1.2 1.2 1.3 1.3 1.3 1.3 8

1.3 1.4 1.3 1.2 1.2 1.2 1.2 1.5 3.5 4.2 3.5 2.3 1.6 1.4 1.3 1.3 1.3 1.3 1.2 1.3 1.3 1.4 1.5 1.6 9

1.6 1.7 1.7 1.5 1.3 1.1 1.1 1.5 4.2 6.3 5.1 3.6 2.6 2.3 2.2 2.4 3.9 3.0 2.2 1.8 1.5 1.4 1.3 1.3 13 2.6 2.I 2.9 2.7 2.1 1.8 1.8 1.9 3.8 3.0 1.9 1.2 1.0 1.0 1.0 1.1 1.3 1.3 1.3 1.3 1.2 1.1 1.1 1.1 1.4 1.4 1.7 1.7 1.7 2.0 3.8 5.5 5.9 4.8 3.5 2.3 1.9 1.8 1.7 I.8 1.9 1.9 1.9 1.8 1.8 1.8 1.8 2.0 12 2.1 2.2 2.9 5.0 2.8 1.8 1.9 2.5 5.7 6.5 5.0 3.4 2.6 2.1 2.0 1.8 2.8 2.3 1.6 1.4 1.4 1.4 1.4 1.5 13 1.5 1.3 1.2 1.6 1.9 2.2 4.9 5.2 5.2 5.4 6.0 7.2 5.9 5.1 5.1 5.2 5.3 5.4 4.3 3.1 2.5 2.2 2.2 2.0 14 2.0 2.1 2.1 1.6 1.6 1.9 2.8 5.6 6.1 5.4 4.4 3.1 2.4 2.1 2.0 1.9 2.0 1.9 1.9 1.8 1.8 1.8 1.7 1.7 8

15 I.7 1.6 1.6 1.5 1.6 2.0 4.9 5.4 3.8 2.6 2.0 1.9 1.9 1.9 l.9 1.9 2.0 1.9 2.0 1.9 1.9 1.9 1.8 1.8

'J 16 1.9 1.8 1.7 1.6 1.7 2.4 5.4 5.6 3.9 2.7 2.2 2.0 1.9 1.9 I.9 1.8 1.7 1.7 1.6 1.6 1.6 1.6 1.5 1.8 17 1.9 1.8 1.8 2.0 2.3 2.8 5.8 6.5 5.8 4.2 2.9 2.4 2.1 2.1 2.0 2.0 2.0 2.0 I.9 1.9 1.8 1.9 1.8 1.9 18 1.8 1.7 1.8 2.1 2.5 3.2 5.8 6.6 5.8 4.3 2.9 2.3 2.1 2.0 2.0 1,9 1.9 1.9 1.9 1.9 1.9 1.9 1.9 los 19 1.8 1.6 1.7 2.0 3.1 5.9 6.0 6.1 6.4 5.8 4.5 3.2 2.5 2.2 2.1 2.0 1.'s 1.8 1.8 1.9 1.8 1.7 1.7

'5 20 1.6 1.6 1.6 1.6 1.7 2.1 2.5 2.9 5.5 5.7 6.0 6.3 7.2 6.4 6.2 6.3 5.9 6.1 5.9 4.6 3.1 2.8 2.7 2.6 21 2.5 2.3 2.3 2.6 2.9 3.4 5.6 5.9 6.4 5.8 4.2 2.9 2.3 2.1 2.0 1.9 1.9 1.8 1.8 1.8 2.1 2.3 2.3 2.!

22 2.0 2.0 2.0 2.2 2.4 2.8 5.0 5.9 6.6 5.1 3.6 2.5 2.1 2.0 1.9 2.0 1.9 1.8 1.8 1.8 1.8 2.1 2.2 2.2 23 2.2 2.2 2.2 2.2 2.4 2.9 5.5 6.2 5.3 3.9 2.8 2.3 2.0 2.0 1.9 1.8 1.8 1.8 1.8 1.8 ' 1.8 1.9 1.8 1.8 24 1.8 2.0 2.5 2.9 2.9 2.8 4.5 4.6 3.2 2.3 2.0 1.9 1.8 1.9 1.9 2.0 2.0 1.9 1.9 1.8 1.*

1.8 1.8 1.8 25 1.8 1.8 1.8 1.8 2.0 2.1 2.1 2.2 3.5 42 5.5 6.3 5.5 3.8 3.2 3.1 4.3 5.2 5.0 3.3 2.1 2.0 1.9 26 1.8 2.6 2.3 1.9 2.2 2.7 3.3 5.2 5.8 6.0 5.0 3.8 2.8 2.3 2.2 2.2 2.0 1.9 2.0 2.0 1.6 1.1 0.6 27 0.5 0.4 0.5 0.5 0.4 0.5 0.4 0.4 0.5 0.5 0.7 1.7 0.6 0.6 0.5 1.0 2.3 1.1 0.6 0.4 0.3 0.4 0.3 28 0.4 0.4 0.4 0.4 0.4 0.5 0.5 0.5 1.0 2.3 1.3 1.0 0.7 0.7 0.7 0.7 0.6 0.6 0.6 0.6 0.6 0.7 0.7 0.7 29 0.7 0.8 0.8 0.,

0.8 0.8 0.8 1.3 3.0 4.1 3.4 2.5 2.0 1.8 1.7 1.7 s.6 1.6 1.5 1.6 1.7 t.6 1.6 1.5 30 1.4 1.5 1.8 2.5 3.6 5.6 5.9 6.1 6.6 5.7 4.1 2.4 1.8 1.7 1.6 1.7 I.7 1.5 1.6 1.4 1.5 1.5 1.5 1.6 31 1.5 1.4 1.4 1.5 1.4 1.3 1.3 2.5 5.8 5.2 3.4 2.4 2.1 1.9 1.9 1.9 1.8 1.7 1.7 1.7 1.7 1.8 1.8 1.7 e

[

rL V

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L SECTION 4 nL WATER QUALITY STUDIES r-nshahm w

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4.

WATER QUALITY STUDIES Dissolved oxygen concentration and pH, in addition to tem-perature, have been monitored continuously by Honeywell W-20 Water Quality Water Collection Systems since 1968 at Station 3, downstream of Vermont Yankee, and since 1970 at Station 7, upstream of the plant.

Summaries of the dissolved oxygen and pH data collected in 1981 are shown in Table 4.1 for Station 3 and Table 4.2

[

for Station 7.

The dissolved oxygen data are reduced to daily means and daily maxima and minima with times of occurrence; the pH

{

data are shown as daily maxima and minima.

The tabulated dissolved oxygen and pH data of Tables 4.1 and

{

4.2 are presented graphically in Figures 4.1 through 4.4.

The shaded areas in those figures show the largest maximum and smallest minimum observed in that month in any one of the years of record prior to 1981.

The shaded areas in the dissolved oxygen graphs are divided by lines connecting the mean D.O. observed for each b

month in all the previous years of observations.

No record minimum hourly average D.O. concentrations were observed in 1981, but maxima were observed in August, September, and October that were greater than had been observed in prior years of

[

study.

At downstream Station 3, the September maximum of 11.8 mg/l exceeded the prior September maximum, in 1973, by 1.5 mg/l and the

{

1981 October maximum of 13.1 mg/l was greater than the previous maximum of 12.9 mg/1, observed in 1977.

At upstream Station 7, the August maximum of 9.3 mg/l exceeded the earlier high of 9.1 mg/1, in 1976, and the maximum September D.O. of 10.8 mg/l was 1.1 mg/l greater than the prior September maximum, which occurred in 1974.

E At both monitoring locations the mean monthly D.O. concentra-tions in the last five months of 1981 were high relative to'the average concentrations observed for those months in all the years

" F h

I of earlier studies.

The monthly means at Station 3 in August' E

October, and December and at Station 7 in September and October 3

were higher in 1981 than the corresponding monthly means of any single prior year of record.

The pH maximum of 7.7 observed at Station 3 in December 1981 exceeded the previous record of 7.6 observed there in 3 prior years.

All other pH maxima and minima of 1981 were within the pH extremes that have been previously observed.

Grab samples for water quality analysis were collected on 6 dates in 1981 at the two monitor stations and from Vermont Yankee's cooling water discharge to the river on the 5 of those dates on which the plant was operating.

These samples were analyzed for sixteen parameters by the procedures of Standard Methods for the Examination of Water and Wastewater, 14th edition (APHA et al.

1976).

The analytical results are shown in Table 4.3. Concentra-tions observed for all parameters in 1981 at both Station 3 and Station 7 were within extremes that had been observed in samples of earlier years of study.

On occasion Vermont Yankee adds the following chemicals to its cooling water discharge to the Connecticut River:

sodium sulfate, as demineralizer regenerant; sodium hypochlorite, to control biological fouling of the condenser cooling system; and sulfuric acid, for pH control.

The amounts of these chemicals discharged to the river are relatively small and not likely to significatly alter the river's water quality.

However, to provide a quantitative basis for assessing the impact of Vermont Yankee's operation on Connecticut River water quality, data on the concentrations of sodium ion, chloride ion, sulfate ion, and alkalinity concentrations were subjected to statistical analysis.

The statistical methods used with these four parameters have been detailed in Reports IV and V of this series (Aquatec 1975, 1976).

Data collected for these four parameters at Stations 3 and 7 before Vermont Yankee began operation and during the times of closed cycle operation through 1974 were combined and subjected to L

[

linear regression analysis.

These analyses, using Station 7 con-centrations as the independent variable, resulted in the statistics

(

summarized in Table 4.4.

{

TABLE 4.4

SUMMARY

OF STATISTICS FROM LINEAR REGRESSION ANALYSIS OF E-PREOPERATIONAL AND CLOSED CYCLE DATA AT STATIONS 7 AND 3 FOR FOUR PARAMETERS PARAMETER Sodium Sulfate Chloride Alkalinity

[

Sample size 70 72 79 00 Intercept 0.23 0.96 1.1 4.9

{

Regression coefficient 0.925 0.927 0.795 0.844 Standard error of regression coefficient 0.041 0.054 0.053 0.049 Correlation coefficient 0.941 0.899 0.861 0.890 Standard error of estimate 0.348 0.987 0.841 2.95 E

The regression lines generated by these analyses are plotted

{

as solid linos in Figure 4.5 for sodium ion, Figure 4.6 for sul-fate ion, Figure 4.7 for chloride ion, and Figure 4.8 for alka-linity.

Each figure also shows, as dashed lines, the 95% confidence limits for Station 3 concentrations predicted by the regression equation from new observations at Station 7.

These confidence limits were drawn from limits calculated for the minimum, mean, and maximum Station 7 concentrations used for each parameter in the regression analyses.

The applicable range.of Station 7 con-centrations for each regression equation is indicated on the

{

figure by the vertical dashed lines at the minimum and maximum value of Station 7 concentrations used to develop the equation.

{_

On each of the figures, points for the data from samples collected in February, when Vermont Yankee was using open cycle condenser cooling, are plotted as open circles.

Points for the data of November, when Vermont Yankee was not operating, and for

)

l May, August, September, and October, when Vermont Yankee was operating in the closed cycle cooling mode, are plotted in the figures as filled circles.

The plotted points for all four parameters are well within the 95% confidence limits for Station 3 concentrations predicted I

by the regression equations from the observed Station 7 concen-trations.

I I

l I

I I

DISSOLVED OXYGEN STATION NO.3 1981 15 x

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2 3

4 5

6 7

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10 11 12 SHADED AREA Maxima,means and minimo MONTHLY MAXIMUM

-====

observed in 1968-1980.

MONTHLY AVERAGE See text.

~~~~~~~~~

FIGURE 4.1

l l

1 U

F R

2

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1 1

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R 1

s R

./

0

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1 M E M

U G M A U R M l

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I hde' N N N O OO M MM 8

N E

7 R

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X 7

N

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H R

T 1

D N 8 N

2 9

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F S T U

b G

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STATION NO. 3 1981 9.0 l

6. 0 -

g g,,, *=Q N

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r

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l 5.0 j

1 2

3 4

5 6

7 8

9 10 II 12 MONTH i

(

SHADED AREA i

Maximo and minimo MONTHLY MAXIMUM -----

observed in 1968-1980.

MONTHLY MINIMUM

---~~~~--

See text.

FIGURE 4.3 1

E E

pH STATION NO. 7 1981

9. 0 8.0 -

-n

. ~- - -

\\

z

/,

y,

f.s

,,. /,s <

m 3 7,0 _%.$W^

aa.~a

,a2="r=

74 4

- * = ~ ~ ----._,

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+

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.a

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N7 N

6. 0 -

S.0 g

i 2

3 4

5 6

7 8

9 10 ll 12 MONTH SHADED AREA Maxima and minima MONTHLY MAXIMUM

===="

observed in 1970 - 1980.

MONTHLY MINIMUM

= * - ~ ~ ~ ~ ~ ~

See text

FIGURE 4.4

COMPARISON OF OBSERVED STATION 3

SODIUM ION CONCENTRATIONS l

WITH STATION 3 CONCENTRATIONS PREDICTED FROM PREOPERATIONAL / CLOSED CYCLE DATA, STATIONS 7 AND 3,1969 - 74 l

Y 15 -

14 -

13 -

]

12 -

B 11 -

3 2

10 -

9

$m 0:yg e-ap 1

8g 7-l O m

/

6-

/

E z

5-

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2 l

S 4-

,' y s' 8

(

e' m

3-I/

i 2-l V

1-e

.x 0

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 STATION 7 SODIUM ION CONCENTR ATION ( MG/L)

REGRESSION EOUATION ( y :.23 +.925:)

95 % CONFIDENCE LIMITS FOR PREDICTED y VALUES VERMONT YANKEE OPEN CYCLE,1981 O

VERMONT YANKE E CLOSED CYCLE OR NOT OPERATING,1981 FIGURE 4.5 COMPARISON OF OBSERVED STATION 3 SULFATE ION CONCENTRATIONS WITH STATION 3 CONCENTRATIONS PREDICTED FROM l

PREOPERATIONAL / CLOSED CYCLE DATA, STATIONS T AND 3,1969 - 74 l

A

/

I Y

I 15 -

i f

/

l 14 -

f g

l

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j 3

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1 2

3 4

5 6

7 8

9 10 Il 12 13 14 15 1

STATION 7 S ULFATE lON CONCENTRATION ( MG/ L )

REGRESSION EQUATION ( y :.96 +.927x) 95 % CONFIDENCE LIMITS FOR PREDICTED y VALUES VERMONT YANKEE OPEN CYCLE,1981 o

VERMONT YANKEE CLOSED CYCLE OR NOT OPERATING,1981 FIGURE 4. 6 COMPARISON OF OBSERVED STATION 3 CHLORIDE ION CONCENTRATIONS WITH STATION 3 CONCENTRATIONS PREDICTED FROM PREOPERATIONAL / CLOSED CYCLE DATA, STATIONS 7 AND 3,1967 - 74

~

I y

e h

15 -

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2 3

4 5

6 7

8 9

10 11 12 13 14 15 STATION 7 CHLORIDE lON CONCENTR ATION (MG/L )

I REGRESSION EQUATION ( y s 1.1 +.795m)

E 95'/o CONFIDENCE LIMITS FOR PREDICTED y VALUES 3

VERMONT YANKEE OPEN CYCLE,1981 o

VERMONT YANKE E CLOSED CYCLE OR NOT OPERATING,1981 FIGURE 4.7 - -

COMPARISON OF OBSERVED STATION 3 ALKALINITY CONCENTRATIONS WITH STATION 3 CONCENTRATIONS PREDICTED FROM g

PREOPERATIONAL / CLOSED CYCLE DATA, STAT; IONS 7 AND 3,1967 - 74 4

ll d

y 50 -

s'/l l

/

l

/

l

/

ll

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30

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10 20 30 40 50 STATION 7 ALK ALINITY (MG/L) il REGRESSION EQUATION ( y s 4.9 +.844 a )

95 % CONFIDENCE LIMITS FOR PREDICTED y VALUES VERMONT YANKEE OPEN CYCLE,1981 o

VERMONT YANKEE CLOSED CYCLE OR NOT OPERATING,1981 e

l FIGURE 4.8.

TABLE 4.1-1 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 JANUARY 1981 l

i DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

Pump Inoperative Pump Inoperative 2

3 4

5 6

7 8

13.3 1400 12.6 0900 13.1 7.2 7.1 l

m 9

13.1 0000 12.0 0900 12.7 7.2 7.1 i

10 12.9 2400 12.0 0630 12.3 7.1 7.1 11 12.9 0000 12.3 2400 12.6 7.2 7.1 12 13.1 2300 12.1 0930 12.7 7.3 7.1 13 13.2 1500 12.5 0930 12.9 7.3 7.1 14 13.1 0000 12.3 0930 12.8 7.1 7.0 15 12.8 0000 12.1 1000 12.6 7.1 7.0 16 12.6 1500 12.1 0900 12.4 7.1 7.0 17 12.8 2400 12.4 0030 12.6 7.1 7.0 18 12.8 0000 12.1 1930 12.6 7.1 7.0 19 12.5 1400 12.2 0930 12.3 7.1 7.0 l

20 12.6 0000 11.9 0930 12.4 7.1 7.0 21 12.6 1330 12.0 1800 12.3 7.1 7.0 l

22 12.5 0100 12.0 1030 12.2 7.1 7.0 1

23

12.6 2400 12.0 1030 12.3 7.1 7.0 24 12.6 0000 12.0 1900 12.2 7.1 7.0 1

25 12.7 0130 11.9 2230 12.3 7.1 7.0 l

26 12.6 2030 11.9 1000 12.3 7.1 7.0 27 12.8 0000 12.2 1000

.12.6

7.1 7.0 28 12.7 0000 12.2 1930 12.5 7.1 7.0 l

29 12.3 0000 12.0 2200 12.1

. 7.1 7.0 30 12.6 2400 12.0 1100 12.3 7.1 6.9 31 12.6 0000 11.9 2200 12.2 7.1 6.9 M

M M

L _.f ~1 R

I'~/8C R

.R R

R_

R.

R R

R M

M M

P TABLE 4.1-2 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 FEBRUARY 1981 DISSOLVED OXYGEN (MG/L)

EH Day Maximum Time Minimum Time Mean Maximum Minimum 1

12.2 2400 11.7 1700 12.0 7.0 6.9 2

12.7 2400 11.9 0900 12.3 7.1 7.0 3

12.9 0930 12.3 2300 12.6 7.2 7.0 4

12.6 2400 12.4 0000 12.5 7.1 7.0 5

13.0 1130 12.6 0000 12.9 7.2 7.1 6

12.9 0330 12.5 0800 12.8 7.2 7.0 7

12.8 0000 12.4 0600 12.6 7.1 7.0 8

12.7 0230 12.1 1330 12.5 7.1 7.0 9

12.6 1630 12.2 0800 12.4 7.1 7.0 4

10 12.3 0030 11.9 0830 12.2 7.1 6.9 11 12.2 0100 11.9 0630 12.1 7.1 7.0 12 Pump Inoperative Pump Inoperative 13 14 15 16 17 18 13.4 0100 13.2 1600 13.3 7.0 6.8 19 14.0 0830 13.4 0000 13.7 7.0 6.8 l

20 Sensor Inoperative 7.2 7.0 l

21 7.2 7.0 22 7.2 7.0 23 7.3 7.1 24 7.2 7.1 25 7.5 7.1 26 7.3 6.9 27 7.1 6.9 28 7.2 7.0

TABLE 4.1-3 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 MARCH 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

Sensor Inoperative 7.2 7.0 2

7.2 7.0 3

7.2 7.0 4

7.2 7.0 5

7.2 7.1 6

7.2 7.0 7

13.3 0900 13.0 1400 13.1 7.2 6.9 8

13.2 0000 13.1 2300 13.1 7.2 7.0 9

13.2 2030 13.1 0630 13.1 7.2 7.0

?

10 13.1 0400 12.9 2400 13.0 7.2 7.0 11 13.0 0330 12.8 1330 12.9 7.2 7.0 12 12.8 0200 12.7 0600 12.8 7.2 7.0 13 12.8 0000 12.6 2400 12.7 7.1 6.9 14 12.7 1030 12.5 1600 12.6 7.2 7.0 15 12.6 0100 12.3 1930 12.5 7.2 7.0 16 12.6 1130 12.1 0830 12.4 7.2 7.0 17 12.6 2300 12.3 0700 12.5 7.2 7.0 18 12.7 1100 12.4 0730 12.6 7.1 6.9 19 12.6 0100 12.3 0930 12.5 7.2 6.9 20 12.7 2330 12.1 0830 12.5 7.2 6.9 21 12.7 0100 12.4 0930 12.6 7.2 6.9 22 12.7 2200 12.3 1130 12.6 7.2 6.9 23 12.9 2100 12.5 0830 12.8 7.2 6.9 24 12.8 0000 12.2 1200 12.5 7.3 7.2 25 12.6 1500 12.2 0830 12.5 7.4 7.2 26 12.6 1100 12.4 0700 12.5 7.4 7.2 27 12.7 0600 12.3 2400 12.5 7.4 7.2 28 12.4 0430 12.3 2400 12.3 7.4 7.2 29 12.3 0000 12.2 2400 12.3 7.4 7.2 30 12.5 1600 12.0 0530 12.3 7.4 7.2 31 12.8 2330 12.4 1130 12.6 7.4 7.2 MBE WER

~

m M

i M

M M

TABLE 4.1-4 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 APRIL 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

13.1 1500 12.8 0000 13.0 7.3 7.2 2

13.0 0000 12.6 1430 12.8 7.3 7.1 3

13.0 1130 12.7 0000 12.9 7.3 7.2 4

12.9 0000 12.5 2400 12.7 7.3 7.2 5

12.6 0130 12.2 0930 12.3 7.3 7.2 6

12.5 2400 12.1 0730 12.3 7.3 7.2 7

12.8 1000 12.5 0000 12.7 7.3 7.2 8

12.7 0030 12.1 2400 12.5 7.3 7.1 E

9 12.4 0800 12.0 0130 12.1 7.2 7.1 y

10 12.4 0400 11.8 1730 12.1 7.3 7.2 11 12.2 0630 11.8 1630 11.9 7.3 7.2 12 11.9 0830 11.7 1600 11.8 7.4 7.2 13 11.9 0830 11.5 1600 11.7 7.4 7.2 14 11.9 0830 11.6 1730 11.8 7.4 7.2 15 12.1 0430 11.7 0530 11.8 7.4 7.2 16 12.2 1100 11.9 1400 12.1 7.4 7.3 17 12.0 0000 11.7 1500 11.9 7.4 7.3 18 12.0 1600 11.9 2400 11.9 7.3 7.2 19 11.9 0800 11.7 2400 11.8 7.4 7.2 20 11.7 0000 11.2 2330 11.5 7.4 7.2 21 11.7 0930 11.3 0000 11.5 7.5 7.3 22 11.7 1630 11.5 0000 11.6 7.5 7.3 23 11.7 0400 11.5 2400 11.6 7.4 7.3 24 11.6 0130 11.4 2400 11.5 7.4 7.2 25 12.1 1700 11.4 0530 11.7 7.5 7.3 26 12.2 2400 12.0 0400 12.1 7.5 7.3 27 12.2 0000 11.7 1500 11.9 7.6 7.3 28 11.9 0000 11.4 2300 11.7 7.4 7.3 29 No Valid Data No Valid Data 30 11.4 0000 11.1 2300 11.2 7.4 7.2

TABLE 4.1-5 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 MAY 1981 DISSOLVCD OXYGEN (MG/L)

EH Day Maximum Time Minimum Time Mean Maximum Minimum 1

11.1 0000 10.8 1330 10.9 7.4 7.3 2

10.8 0000 10.6 0730 10.7 7.4 7.3 3

10.6 0230 10.3 2400 10.4 7.4 7.3 4

Pump Inoperative Pump Inoperative 5

10.6 1500 10.3 2400 10.4 7.5 7.4 6

10.6 0130 10.2 1600 10.4 7.6 7.3 7

10.6 1500 10.3 0700 10.4 7.5 7.4 8

10.5 1630 10.3 0600 10.4 7.6 7.3 9

10.5 1400 10.2 0930 10.3 7.5 7.3 o

10 10.5 2000 9.9 0930 10.2 7.5 7.3 11 10.4 1930 9.9 0900 10.2 7.5 7.3 12 10.4 0030 9.9 2400 10.1 7.5 7.4 l

13 10.3 2400 9.7 0600 10.0 No Valid Data 14 10.5 0800 10.0 0930 10.3 15 10.2 1600 10.0 1200 10.1 l

16 10.6 2100 10.3 1600 10.5 17 10.6 0730 10.4 2400 10.5 18 10.4 0000 10.0 1700 10.2 19 10.3 2200 10.1 1630 10.2 20 10.4 0800 10.0 1900 10.2 7.4 7.3 21 10.2 0500 10.0 1330 10.1 7.4 7.2 22 10.1 0000 9.9 2400 10.0 7.4 7.2 23 10.1 0200 9.9 1100 10.0 7.4 7.2 24 10.1 0000 9.9 2400 10.0 7.6 7.3 l

25 10.2 1830 9.9

-2400 10.1 7.7 7.3 l

26 10.1 2030 9.8 0530 10.0 7.5 7.4 l

27 No Valid Data 7.8 7.4 l

28 7.7 7.4 29 7.7 7.4 30 9.0 1930 8.4 0600 8.7 7.8 7.4 31 9.2 1700 8.8 0730 9.0 7.6 7.4 W

M M

M

m M

M M

M TABLE 4.1-6 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 JUNE 1981 DISSOLVED OXYGEN (MG/L)

EH Day Maximum Time Minimum Time Mean Maximum Minimum 1

8.9 1130 8.7 0530 8.8 7.5 7.3 2

9.0 1830 8.6 0930 8.8 7.4 7.2 3

8.9 1700 8.8 0000 8.8 7.5 7.3 4

No Valid Data 7.8 7.5 5

7.7 7.4 6

7.6 7.4 7

7.6 7.3 8

8.0 7.3 E

9 7.7 7.5 y

10 7.6 7.4 11 7.6 7.3 12 8.6 1800 8.3 0900 8.4 7.5 7.2 13 8.7 1830 8.2 0730 8.5 7.7 7.3 14 8.5 0000 8.2 1100 8.3 7.5 7.3 15 8.2 2000 8.0 0800 8.1 7.5 7.2 16 8.3 2230 8.1 0200 8.2 7.6 7.3 17 8.9 1830 8.1 0300 8.5 7.6 7.2 18 9.2 1730 8.4 0300 8.7 7.5 7.1 19 9.3 1830 8.7 0530 9.0 7.7 7.1 20 9.0 0000 8.4 2400 8.7 7.4 7.2 21 8.8 1630 8.2 0700 8.5 7.5 7.1 22 8.2 0000 8.0 2400 8.1 7.3 7.1 23 8.2 1930 7.9 0800 8.0 7.2 7.1 24 8.3 2000 7.8 0600 8.0 7.4 7.0 25 8.3 2000 7.8 0700 8.0 7.3 7.1 26 8.5 1830 7.9 0600 8.2 7.4 7.1 27 8.5 1700 8.0 0630 8.3 7.5 7.1 28 8. '>

2100 8.1 0600 8.5 7.7 7.1 29 8.6 1600 8.3 0600 8.5 7.6 7.2 30 ft. 5 1400 8.~2 2400 8.4 7.5 7.2

TABLE 4.1-7 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 JULY 1981 I

DISSOLVED OXYGEN (MG/L)

PII Day Maximum Time Minimum Time Mean Maximum Minimum 1

8.5 1730 8.0 0630 8.3 7.3 7.2 2

8.3 0000 7.9 0630 8.1 7.6 7.3 3

8.0 2130 7.6 0600 7.8 7.5 7.2 4

7.9 0000 7.7 1230 7.8 7.4 7.2 5

Pump Inoperative Pump Inoperative 6

7 8

7.9 1830 7.4 2400 7.6 7.4 7.0 E

9 7.4 0000 7.0 1330 7.2 7.3 6.9 y

10 No Valid Data 7.3 7.0 11 7.3 6.9 12 7.7 1700 7.1 0600 7.3 7.3 7.0 13 7.4 1430 6.7 2400 7.0 7.3 6.9 14 6.7 0000 6.2 2400 6.4 7.2 7.0 15 No Valid Data 7.3 7.0 16 7.3 7.0 17 7.0 1800 6.7 0900 6.9 7.3 7.0 18 6.9 1930 6.6 0600 6.7 7.3 7.0 19 6.7 0000 6.1 2400 6."

7.3 7.1 20 6.2 0030 5.6 2200 6.0 7.1 6.9 21 6.2 1830 5.6 0700 5.9 7.3 6.9 22 6.5 1900 5.9 0500 6.3 7.3 7.1 23 6.7 1400 6.3 0500 6.4 7.3 7.1 24 6.9 1830 6.5 0630 6.7 7.3 7.0 25 7.0 1600 6.5 0430 6.7 7.3 7.0 26 7.0 1600 6.5 2400 6.8 7.3 7.1 27 7.3 1630 6.8 0600 7.1 7.3 7.2 28 7.4 1130 7.1 2400 7.3 7.3 7.1 29 7.1 0000 7.0 1030 7.1 7.2 7.1 30 7.7 1700 7.2 0000 7.5 7.4 7.1 31 8.1 1830 7.4 0630 7.8 7.5 7.2 M

M M

M

7

_n-n_

n n.

n n... - __ n __.. _ n

- n n

n n

- n n

n O

-n n

F TABLE 4.1-8 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 AUGUST 1981 DISSOLVED OXYGEN (MG/L)

EH Day Maximum Time Minimum Time Mean Maximum Minimum 1

8.1 2130 7.7 0730 7.9 7.6 7.2 2

8.3 2230 7.7 0730 8.0 7.6 7.2 3

8.7 1630 7.8 0700 8.2 7.7 7.2 4

8.6 1730 7.9 0600 8.2 7.7 7.1 5

8.0 1300 7.5 0800 7.7 7.5 7.2 6

8.1 2030 7.5 0700 7.7 7.3 7.1 7

8.2 1530 7.7 0730 7.9 7.4 7.0 8

8.1 1630 7.7 0730 7.9 7.3 7.0 d2 9

8.0 2200 7.5

0630, 7.8 7.4 7.1 y

10 8.2 2030 7.7 0630 7.9 7.5 7.2 11 8.4 1830 7.6 0630 8.0 7.5 7.1 12 8.3 1700 7.9 0630 8.1 7.5 7.2 13 8.2 1700 7.9 0430 8.1 7.4 7.2 14 8.2 2000 7.7 0600 7.9 7.4 7.1 15 7.9 1100 7.6 1500 7.7 7.3 7.2 16 8.5 1730 7.5 0500 8.0 7.4 7.1 17 8.2 1900 7.4 1000 7.9 7.2 7.0 18 8.9 2400 7.9 0400 8.4 7.4 7.0 19 9.1 2230 8.7 0330 8.9 7.4 7.1 20 9.2 0400 8.7 1930 9.0 7.3 7.0 21 9.1 1400 8.8 0200 9.0 7.4 7.0 22 9.0 0100 8.5 1100 8.7 7.3 7.0 23 8.7 2030 8.4 0600 8.5 7.3 7.0 24 8.5 1630 8.3 0700 8.4 7.2 7.0 25 8.6 1930 8.1 0730 8.3 7.2 7.0 26 Sensor Inoperative 7.4 7.0 27 7.5 7.0 28 9.2 2130 8.8 0930 9.0 7.6 7.1 29 9.4 1730 8.9 0500 9.1 7.7 7.2 30 9.3 2200 9.0 0900 9.1 7.5 7.3 31 9.4 1630 9.0 0600 9.2 7.7 7.3

TABLE 4.1-9 DISSOLVED OXYGEN AND pli DATA VERMONT YANKEE SAMPLE STATION NO. 3 SEPTEMBER 1981 DISSOLVED OXYGEN (MG/L) pli Day Maximum Time Minimum Time Mean Maximum Minimum 1

9.6 1730 9.2 0700 9.4 7.8 7.3 2

9.4 0000 8.9 2400 9.2 7.5 7.3 3

8.9 0000 8.5 0730 8.6 7.4 7.2 4

9.0 1830 8.5 0500 8.7 7.4 7.1 5

9.0 1730 8.6 0600 8.8 7.5 7.1 6

8.8 1530 8.5 0830 8.7 7.5 7.2 7

8.6 0000 8.1 2000 8.3 7.3 7.1 8

8.4 1630 8.0 0830 8.2 7.4 7.1 E

9 8.8 1630 8.2 0600 8.5 7.4 7.1 f

10 9.0 1730 8.6 0330 8.8 7.4 7.1 11 9.0 1630 8.7 0700 8.8 7.5 7.1 12 8.9 1800 8.6 0800 8.7 7.5 7.2 13 9.0 1600 8.6 0730 8.8 7.5 7.2 l

14 8.9 1700 8.7 2400 8.8 7.5 7.2 15 9.2 2100 8.6 0600 8.9 7.5 7.2 16 9.1 0000 8.7 2400 8.9 7.5 7.2 17 8.7 1630 8.5 0700 8.6 7.4 7.2 1

18 8.6 1630 8.4 0800 8.5 7.4 7.2 19 8.6 2100 8.4 0630 8.5 7.3 7.2 20 8.8 1930 8.5 0700 8.6 7.3 7.2 21 8.8 2000 8.5 0730 8.6 7.3 7.2 1

22 9.2 2400 8.6 0830 8.8 7.3 7.2 l

23 10.4 2400 9.2 0000 9.8 7.4 7.2 24 11.5 2400 10.4 0000 10.9 7.3 7.2 25 11.8 1100 11.5 0100 11.7 7.3 7.2 26 11.8 1100 11.4 2330 11.6 7.3 7.1 27 11.5 0100 11.0 2300 11.3 7.4 7.2 l

28 10.9 0000 10.7 1500 10.8 7.3 7.2 l

29 10.6 0000 10.4 1700 10.5 7.2 7.1 30 10.5 2200 10.3 0630 10.4 7.3 7.2 1

==

M M

M TABLE 4.1-10 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 OCTOBER 1981 DISSOLVED OXYGEN (MG/L) gli Day Maximum Time Minimum Time Mean Maximum Minimum 1

10.6 0300 10.3 1430 10.5 7.3 7.2 2

10.5 0900 10.3 1530 10.4 7.3 7.2 3

10.5 2400 10.3 0700 10.4 7.4 7.3 4

10.9 0730 10.5 0000 10.7 7.4 7.3 5

11.0 0930 10.6 0000 10.8 7.5 7.3 6

11.0 2000 10.6 00J0 10.8 7.5 7.4 7

11.1 0830 10.8 2200 11.0 7.5 7.4 8

11.0 0800 10.7 2100 10.8 7.4 7.3 E

9 11.2 2030 10.8 0100 11.0 7.5 7.4 f

10 11.2 2200 11.1 1500 11.2 7.5 7.3 11 11.4 1100 11.2 0500 11.3 7.5 7.3 12 11.6 2230 11.3 1500 11.4 7.4 7.3 13 11.6 0800 11.2 1900 11.4 7.4 7.3 14 11.6 1030 11.3 1800 11.4 7.3 7.2 15 11.5 0430 10.8 0730 11.2 7.4 7.2 16 11.4 0030 10.7 0900 11.2 7.4 7.2 17 11.5 1130 11.3 2230 11.4 7.4 7.3 18 11.3 1830 11.1 0800 11.2 7.4 7.2 19 11.2 2100 11.0 0500 11.1 7.4 7.3 20 11.3 0400 11.2 1730 11.2 7.4 7.3 21 11.5 1100 11.2 2130 11.3 7.5 7.4 22 11.3 2300 11.1 1530 11.2 7.5 7.4 23 11.3 0100 10.9 1900 11.0 7.5 7.4 24 11.3 2330 10.9 1130 11.1 7.5 7.4 25 11.5 2330 11.2 0000 11.3 7.5 7.3 26 11.6 0800 11.4 0000 11.5 7.5 7.4 27 11.6 0030 11.4 1600 11.5 7.4 7.3 28 12.1 1300 11.5 0000 11.9 7.4 7.3 29 12.4 1000 12.1 0000 12.3 7.4 7.2 30 12.6 0730 12.4 1600 12.5 7.4 7.2 31 13.1 1830 12.6 0430 12.8 7.3 7.2

TABLE 4.1-11 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 NOVEMBER 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean elaximum Minimum 1

13.2 0430 13.0 1130 13.1 7.4 7.2 2

13.1 0900 12.8 1630 13.0 7.4 7.3 3

13.0 0630 12.8 1530 12.9 7.4 7.3 4

13.0 0700 12.8 1600 12.9 7.4 7.3 5

13.1 0430 12.6 1600 12.8 7.4 7.2 6

12.8 1000 12.6 1900 12.7 7.4 7.3 7

12.9 1100 12.7 0000 12.8 7.5 7.3 8

13.1 0800 12.8 1530 12.9 7.5 7.3 E

9 12.9 1400 12.6 2300 12.8 7.5 7.4 f

10 12.9 1930 12.6 0000 12.8 7.5 7.3 11 12.9 2200 12.7 0600 12.8 7.3 7.2 12 13.1 2400 12.9 0100 13.0 7.4 7.2 l

13 13.2 2000 13.0 0200 13.1 7.4 7.2 l

14 13.3 2000 13.1 0500 13.2 7.4 7.2 15 13.3 2130 13.1 1200 13.2 7.4 7.3 l

16 13.3 0100 12.9 1500 13.1 7.5 7.4 17 13.2 0100 13.1 2300 13.1 7.5 7.4 18 13.1 0100 12.6 2400 12.8 7.5 7.4 19 12.7 1030 12.5 2330 12.6 7.5 7.4 20 12.7 1230 12.4 0700 12.5 7.5 7.4 21 12.9 1130 12.5 0230 12.7 7.6 7.5 22 13.0 0430 12.6 1700 12.8 7.6 7.5 l

23 12.9 2230 12.6 0330 12.7 7.6 7.4 24 13.3 2400 12.9 0130 13.1 7.6 7.4 25 13.5 2400 13.3 0130 13.4 7.6 7.5 26 13.7 0830 13.5 0000 13.6 7.6 7.4 27 13.5 1500 13.4 0300 13.5 7.6 7.5 28 13.4 1230 13.3 2100 13.3 7.6 7.4 29 13.4 1830 13.3 0300 13.3 7.6 7.5 30 13.6 2100 13.3 0200 13.5 7.7 7.5 1

1

TABLE 4.1-12 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 3 DECEMBER 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

13.6 2330 13.4 0800 13.5 7.7 7.5 2

13.6 0430 13.5 2230 13.6 7.6 7.5 3

13.6 0300 13.4 1600 13.5 7.6 7.5 4

13.5 0500 13.3 2400 13.4 7.6 7.4 5

13.6 2200 13.0 0900 13.4 7.6 7.5 6

13.7 2300 13.4 0330 13.5 7.7 7.5 7

13.7 0600 13.4 2000 13.6 7.7 7.5 8

13.8 2130 12.8 0930 13.6 7.7 7.5 9

13.9 0600 12.6 0930 13.7 7.7 7.5 w

10 14.1 1430 13.5 0230 13.9 7.7 7.5 11 13.9 1930 12.7 0800 13.7 7.6 7.5 12 14.0 2030 12.5 0900 13.8 7.6 7.4 13 14.0 0330 12.6 1130 13.5 7.7 7.4 14 14.0 2400 12.8 0830 13.8 7.6 7.5 15 14.0 0000 12.9 0700 13.8 7.7 7.5 16 14.0 2230 12.9 0700 13.8 7.7 7.5 17 14.0 1700 13.0 0800 13.8 7.7 7.6 18 14.0 0100 12.9 0730 13.8 7.7 7.5 19 13.9 1630 12.9 0830 13.8 7.7 7.5 20 13.9 0230 12.7 1230 13.5 7.7 7.4 21 13.9 1630 13.0 0830 13.7 7.6 7.4 22 14.0 2030 12.7 0800 13.8 7.5 7.4 23 14.0 1530 12.9 0730 13.8 7.6 7.4 24 14.1 1230 13.7 0400 14.0 7.6 7.5 25 14.0 0130 13.0 1130 13.7 7.6 7.4 26 14.2 2400 32.8 0900 13.8 7.6 7.4 27 14.2 0130 14.1 2400 14.1 7.5 7.4 28 14.1 0100 13.9 1030 14.0 7.5 7.4 29 14.0 0500 13.0 0930 13.8 7.6 7.4 30 13.9 2300 12.7 0830 13.7 7.5 7.3 31 14.0 1800 12.9 0900 13.8 7.5 7.4

\\

TABLE 4.2-1 DISSOLVED OXYGEN AND pli DATA VERMONT YANKEE SAMPLE STATION NO. 7 JANUARY 1981 DISSOLVED OXYGEN (MG/L) gli Day Maximum Time Minimum Time Mean Maximum Minimum 1

13.5 2330 13.2 0430 13.3 7.0 7.0 2

13.5 0300 13.2 1930 13.3 7.0 6.9 3

13.5 2000 13.3 0000 13.4 7.0 7.0 4

13.5 1100 13.4 1600 13.4 7.0 7.0 5

13.5 1130 13.4 2100 13.5 7.1 7.0 6

13.8 2230 13.4 0000 13.6 7.0 6.9 7

13.7 0000 13.3 2400 13.6 7.0 6.9 8

13.3 0000 13.1 2000 13.2 7.0 6.9 e

9 13.3 2030 13.2 1230 13.3 7.1 7.0 7

10 13.5 2200 13.3 0000 13.4 7.1 7.0 11 13.5 2400 13.4 1430 13.5 7.1 7.0 12 13.5 0330 13.4 1830 13.5 7.1 6.9 13 13.5 0130 13.3 1600 13.4 7.0 6.9 l

14 13.4 0000 13.2 1730 13.3 6.9 6.9 15 13.4 0730 13.2 2000 13.3 6.9 6.8 16 13.2 1530 13.1 0930 13.2 6.9 6.9 17 13.2 2130 13.2 1130 13.2 6.9 6.9 18 13.2 0700 13.1 1900 13.2 6.9 6.8 l

19 13.2 1330 13.0 2300 13.1 6.9 6.8 l

20 13.1 1830 12.8 1000 13.0 6.9 6.8 1

21 13.3 2400 13.0 0430 13.1 6.9 6.9 l

22 13.2 0300 13.2 1100 13.2 6.9 6.9 i

23 13.2 0130 12.9 2100 13.1 6.9 6.9 24 13.0 0000 12.8 2000 12.9 6.9 6.8 25 12.9 2400 12.7 0000 12.8 6.9 6.8 26 12.9 1430 12.8 2000 12.9 6.8 6.8 27 12.8 0700 12.6 1900 12.7 6.9 6.8 28 12.9 2400 12.7 0830 12.8 6.8 6.8 29 13.0 0630 12.8 2400 12.9 6.8 6.8 30 12.8 0000 12.6 2000 12.7 6.9 6.8 31 12.7 2400 12.6 0000 12.6 6.9 6.8 M

M M

M

E E

E i

TABLE 4. 2-2 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 FEBRUARY 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

12.7 0100 12.6 2100 12.7 6.9 6.8 2

13.1 2400 12.7 0000 12.9 6.9 6.8 3

13.1 0000 12.7 2400 12.8 6.9 6.8 4

13.0 2400 12.7 0000 12.8 6.9 6.8 5

13.2 0700 12.9 2400 13.0 6.9 6.8 6

12.9 0000 12.7 2230 12.8 6.9 6.8 7

12.9 2400 12.6 1200 12.8 6.9 6.8 8

13.0 2400 12.9 0000 12.9 6.8 6.8 1

9 13.0 0000 13.0 2400 13.0 6.8 6.7 10 13.0 0000 12.8 1100 12.9 6.8 6.7 11 13.4 2400 12.9 0000 13.2 6.8 6.7 12 14.0 2400 13.3 0430 13.6 6.7 6.7 13 14.4 2100 14.0 0000 14.2 6.8 6.7 14 14.4 0000 14.2 1800 14.3 6.7 6.5 15 14.3 0000 14.1 1300 14.2 6.6 6.5 16 14.2 0000 14.0 1430 14.1 6.7 6.6 17 14.1 0000 13.9 1430 14.0 6.7 6.6 18 13.9 2400 13.8 1600 13.8 6.7 6.6 19 13.9 0000 13.7 1130 13.8 6.7 6.6 20 13.9 0630 13.7 1730 13.8 6.7 6.6 21 14.0 0830 13.7 0330 13.9 6.8 6.6 22 14.5 1530 14.2 2100 14.3 6.7 6.7 23 14.5 0400 14.3 1200 14.4 6.8 6.7 24 14.5 0000 14.3 2400 14.4 6.7 6.6 25 14.5 1500 14.4 1230 14.4 6.8 6.6 26 14.5 0000 14.2 1330 14.4 6.7 6.7 27 14.1 0830 13.9 1600 14.0 6.8 6.7 28 14.2 1130 14.0 0000 14.1 6.8 6.7

TABLE 4.2-3 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 MARCII 1981 DISSOLVED OXYGEN (MG/L)

EH Day Maximum Time Minimum Time Mean Maximum Minimum l

1 Sensor Inoperative 6.8 6.7 2

6.8 6.8 3

6.8 6.8 4

7.0 6.8 5

7.0 6.9 l

6 7.0 6.9 7

13.3 1830 13.2 2400 13.3 7.0 6.9 8

13.4 1030 13.2 0000 13.3 7.0 7.0 e

9 13.2 0630 13.1 0130 13.2 7.1 7.0 10 13.2 2400 13.1 1230 13.2 7.0 7.0 l

8 11 13.2 0000 13.1 1900 13.2 7.1 7.0 l

12 13.2 0000 13.1 1200 13.2 7.1 7.0 l

13 13.2 0000 13.0 1630 13.1 7.1 7.0 14 13.1 0530 12.9 1500 13.0 7.1 7.0 15 13.0 2400 12.7 1500 12.9 7.1 7.0 16 13.1 0730 12.9 1430 13.0 7.2 7.1 17 12.9 0400 12.5 1730 12.7 7.2 7.1 18 12.9 0930 12.6 0000 12.8 7.2 7.1 19 13.0 0500 12.8 2030 12.9 7.2 7.1 20 12.9 0200 12.6 2030 12.7 7.2 7.1 21 13.1 0130 12.9 2130 13.0 7.2 7.1 22 13.0 0000 12.8 1830 12.9 7.2 7.1 23 13.1 0730 12.7 1730 12.9 7.2 7.1 24 12.9 0730 12.5 1600 12.7 7.2 7.1 25 12.6 0000 12.5 1000 12.5 7.1 7.1 26 Pump Inoperative Pump Inoperative 27 28 29 30 31 M

9 R

R R

R

_R R

R R

R T~l,_,J~'~1 R

O M

I TABLE 4.2-4 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 APRIL 1981 DISSOLVED OXYGEN (MG/L)

EH Day Maximum Time Minimum Time Mean Maximum Minimum 1

Pump Inoperative Pump Inoperative 2

3 g

M H

H H

5 6

7 12.2 2400 11.9 1930 12.0 7.0 6.9 8

12.5 0700 11.9 2030 12.2 7.1 6.9 H

9 12.1 0030 12.0 2400 12.0 7.2 7.0 10 12.0 0000 11.8 2000 11.9 7.2 7.1 8

11 11.9 0000 11.7 2200 11.8 7.2 7.1 12 11.9 0130 11.6 1800 11.7 7.2 7.1 13 11.8 0330 11.6 1530 11.7 7.2 7.1 14 11.9 2230 11.7 1030 11.8 7.2 7.1 15 12.1 2400 11.9 1130 12.0 7.2 7.1 16 12.4 1330 12.1 0000 12.3 7.2 7.1 17 12.3 1230 12.2 0230 12.2 7.2 7.1 18 12.3 0230 11.7 2000 12.0 7.2 7.1 19 11.9 0700 11.6 2400 11.7 7.2 7.1 20 11.6 0000.

11.3 1830 11.5 7.2 7.1 21 11.7 2230 11.4 0000 11.6 7.3 7.2 22 11.8 0630 11.6 1630 11.7 7.2 7.1 23 11.7 0830

'11.5 1630 11.6 7.2 7.1 24 11.5 0800 11.3 2400 11.4 7.2 7.1 25 11.5 2400 11.2 0400 11.4 7.2 7.1 26 11.6 0930 11.5 0000 11.6 7.2 7.1 27 11.6 0700 11.4 2330 11.5 7.2 7.1 28 11.4 0000 11.1 1000 11.2 7.2 7.1 29 11.4 0630 11.2 1730 11.3 7.2 7.1 30 11.2 0730 11.0 2400 11.1 7.2 7.1

TABLE 4,2-5 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 MAY 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

11.0 0800 10.6 1700 10.8 7.2 7.0 2

10.9 0000 10.6 2230 10.8 7.2 7.1 3

10.8 0930 10.3 2400 10.7 7,2 7.1 4

10.4 0630 10.1 2400 10.3 7.3 7.1 5

10.1 0000 9.7 2400 9.9 7.3 7.2 6

9.7 0000 9.3 2400 9.6 7.4 7.2 7

9.5 1030 9.3 0000 9.4 7.3 7.2 8

9.6 1200 9.5 0000 9.5 7.3 7.2 H

9 9.7 2400 9.5 0000 9.6 7.4 7.3 8

10 9.8 0800 9.5 1930 9.7 7.4 7.3 I

11 9.6 2400 9.6 0000 9.6 7.4 7.3 12 9.6 0000 9.5 2400 9.5 7.4 7.2 13 9.7 2400 9.5 0000 9.6 7.3 7.2 14 10.0 0900 9.7 0000 9.9 7.3 7.1 15 9.8 0000 9.6 1700 9.7 7.3 7.2 16 9.9 2130 9.6 0330 9.8 7.3 7.2 17 10.0 0900 9.7 2400 9.9 7.3 7.1 18 10.0 1000 9.7 0000 9.8 7.3 7.2 19 10.0 2100 9.8 0000 9.9 7.3 7.2 20 10.0 0000 9.8 1600 9.9 7.3 7.1 21 9.9 0300 9.7 1900 9.8 7.2 7.1 22 10.0 0700 9.6 2400 9.8 7.2 7.2 23 9.8 1300 9.7 2400 9.8 7.3 7.2 24 9.9 1230 9.8 2400 9.8 7.3 7.2 25 9.8 0000 9.4 2000 9.7 7.4 7.3 26 9.6 0000 9.4 1630 9.5 7.4 7.3 27 9.4 0300 9.1 2400 9.3 7.5 7.3 28 9.1 0000 8.7 2400 8.8 7.5 7.3 29 8.9 2030 8.6 1000 8.8 7.4 7.3 30 8.9 0200 8.5 2300 8.8 7.3 7.2 31 8.6 0000 8.5 2400 8.6 7.3 7.2 o

M M

TABLE 4.2-6 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 JUNE 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

8.7 1700 8.5 0500 8.6 7.3 7.1 2

8.7 0000 8.4 2400 8.5 7.4 7.1 3

8.5 1800 8.2 0700 8.4 7.5 7.2 4

8.6 1700 8.3 0830 8.5 7.4 7.3 5

8.6 0030 8.3 100G 8.4 7.4 7.2 6

8.4 0000 8.1 1200 8.2 7.3 7.2 7

8.4 2400 8.0 1000 8.2 7.5 7.2 8

8.5 1930 8.3 0730 8.4 7.5 7.4 4

9 8.4 0000 8.1 1000 8.3 7.4 7.2 o

10 8.3 1500 8.1 0600 8.2 7.4 7.2 Y

11 8.4 1400 8.2 0230 8.3 7.2 7.2 12 8.5 1600 8.2 0000 8.3 7.3 7.1 13 8.5 1500 8.2 0000 8.4 7.3 7.2 14 8.5 1030 8.3 2400 8.4 7.3 7.2 15 8.5 2030 8.3 2400 8.4 7.2 7.1 16 8.3 0000 8.0 1500 8.2 7.3 7.1 17 8.2 2300 7.9 1430 8.0 7.2 7.1 18 8.1 2400 7.9 1030 8.0 7.3 7.1 19 8.0 0000 7.8 2400 7.9' 7.3 7.2 20 7.8 0000 7.7 2400 7.8 7.4 7.2 21 7.7 0000 7.1 0900 7.4 7.3 7.2 22 7.7 0000 7.5 1300 7.6 7.2 7.1 23 No Valid Dnta 7.1 7.1 24 7.9 2000 7.7 1300 7.8 7.3 7.1 25 8.0 2400 7.7 1130 7.9 7.3 7.1 26 8.2 2100 7.9 1030 8.0 7.2 7.1 27 8.2 0000 8.0 0700 8.1 7.2 7.1 28 8.4 1600 8.1 1300 8.3 7.3 7.1 29 8.4 0000 8.2 1200 8.3 7.3 7.2 30 8.5 2400 8.2 0930 8.3 7.4 7.2 e

TABLE 4.2-7 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 JULY 1981 DISSOLVED OXYGEN (MG/L)

{}

Day Maximum Time Minimum Time Mean Maximum Minimum 1

8.5 0000 8.2 1800 8.3 7.4 7.3 2

8.2 0000 7.8 2200 8.0 7.4 7.2 3

7.8 0000 7.4 2400 7.6 7.3 7.2 4

7.4 0000 6.9 1900 7.2 7.3 7.1 5

7.3 0330 7.0 2400 7.1 7.2 7.0 6

7.2 2400 6.8 1330 7.0 7.2 7.0 7

7.3 1500 7.2 0630 7.2 7.1 7.1 8

7.2 0000 6.5 2400 6.8 7.1 7.0 d,

9 6.8 1800 6.6 1000 6.7 7.1 7.0 o

10 6.9 0000 6.7 1130 6.8 7.1 7.0 i

11 No Valid Data 7.1 7.0 12 7.1 6.9 13 6.2 1630 5.9 2100 6.0 7.0 6.8 14 6.0 2330 5.7 1200 5.9 7.0 6.9 l

15 6.3 1500 5.7 0700 6.1 7.0 6.9 16 No Valid Data 7.0 6.8 17 6.9 6.8 18 6.9 6.8 19 6.9 6.8 20 7.0 6.8 21 6.0 1700 5.5 1100 5.8 7.0 7.0 22 6.2 2300 5.8 0530 6.0 7.0 7.0 23 6.3 2300 5.8 1400 6.0 7.0 6.9 i

l 24 6.3 0000 6.2 0430 6.2 7.0 7.0 25 6.2 0100 6.1 1400 6.1 7.0 7.0 26 No Valid' Data 7.1 7.0 27 6.8 2030 6.6 0000 6.7 7.1 7.1 28 6.8 1800 6.4 1000 6.6 7.1 7.0 29 7.3 1730 6.4 0800 6.8 7.1 7.1 30 7.5 2400 6.8 0600 7.1 7.2 7.1 31 7.5 0000 7.3 2400 7.4 7.2 7.1 M

M M

TABLE 4.2-8 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 AUGUST 1981 DISSOLVED OXYGEN (MG/L)

Eli Day Maximum Time Minimum Time Mean Maximum Minimum 1

7.4 2100 7.1 1130 7.3 7.3 7.1 2

7.5 0100 7.1 1400 7.3 7.3 7.1 3

7.8 1730 6.9 0900 7.4 7.4 7.1 4

7.4 1430 7.0 0930 7.2 7.3 7.2 5

8.0 1800 7.2 0800 7.6 7.2 7.1 6

7.8 1600 7.4 1100 7.6 7.2 7.1 7

7.5 0400 7.1 1630 7.3 7.2 7.1 8

7.4 1400 7.2 0830 7.3 7.2 7.1 h

9 7.5 1100 7.2 1700 7.4 7.3 7.2 g

10 7.8 2200 7.5 0600 7.6 7.3 7.1 i

11 8.2 2300 7.7 0530 7.9 7.3 7.1 12 8.1 0000 7.6 2030 7.8 7.3 7.1 13 7.6 0000 6.8 2100 7.2 7.2 7.1 14 Sensor Inoperative 7.3 7.2 15 7.3 7.1 16 7.2 7.1 17 7.1 7.0 18 7.2 7.0 19 7.2 7.1 20 7.2 7.0 21 7.1 7.0 22 8.3 0800 7.9 2400 8.1 7.1 7.0 23 7.9 0100 7.6 2130 7.8 7.0 6.9 24 7.9 1430 7.6 0330 7.7 7.1 7.0 1

25 8.0 1630 7.7 0800 7.8 7.1 7.0 26 Sensor Inoperative 7.3 7.0 27 No Valid Data 7.3 7.1 28 7.4 7.1 29 9.1 2130 8.6 1130 8.9 7.3 7.1 30 9.0 0200 8.6 1930 8.8 7.3 7.2 31 9.3 1000 8.8 2330 9.1 7.4 7.3

TABLE 4.2-9 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 SEPTEMBER 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

9.4 1500 8.8 0930 9.1 7.3 7.2 2

9.0 0100 8.3 0930 8.6 7.3 7.1 3

8.7 0300 8.2 2400 8.4 7.2 7.1 4

8.2 1630 7.9 1200 8.1 7.1 7.0 5

8.2 0200 7.5 2230 7.9 7.1 7.0 6

8.0 2330 7.5 0200 7.7 7.2 7.0 7

8.4 1930 7.9 0300 8.2 7.2 7.1 8

8.9 2400 8.0 1030 8.4 7.2 7.1 H

9 8.9 1500 8.4 2300 8.7 7.2 7.1 S

10 9.0 1830 8.5 0800 8.7 7.2 7.1 8

11 8.8 0000 8.3 1130 8.6 7.2 7.1 12 8.8 1530 8.2 0900 8.5 7.2 7.1 13 8.6 0000 8.1 1030 8.3 7.2 7.1 14 9.4 1930 8.4 0700 8.9 7.4 7.1 15 9.2 0000 8.5 2400 8.8 7.4 7.3 16 8.5 0000 7.9 2400 8.3 7.3 7.2 17 8.3 1530 7.9 0000 8.0 7.2 7.1 18 8.2 0000 7.7 1430 7.9 7.2 7.1 19 8.5 2230 7.9 0630 8.2 7.2 7.1 20 8.4 0000 8.0 1200 8.2 7.2 7.1 21 8.2 1800 7.7 1200 7.9 7.2 7.1 22 8.5 2300 7.8 1200 8.1 7.2 7.0 23 9.1 2230 8.1 0730 8.4 7.2 7.1 24 10.4 2400 9.1 0000 9.8 7.3 7.1 25 10.6 1500 10.4 0000 10.5 7.2 7.1 26 10.7 1500 10.5 0000 10.6 7.1 7.0 27 10.8 0430 10.3 2330 10.6 7.2 7.1 28 10.3 0000 9.6 2230 9.9 7.2 7.1 29 9.8 1900 9.6 0000 9.7 7.2 7.1 30 10.0 2230 9.8 0000 9.9 7.2 7.1 M

M M

M

M m

M M

MM~

TABLE 4. 2-10 DISSOLVED OXYGEN AND pH DATA VERMONT YI.NKEE SAMPLE STATION NO. 7 OCTOBER 1981 DISSOLVED OXYGEN (MG/L) pH Day Maximum Time Minimum Time Mean Maximum Minimum 1

10.1 2400 9.9 0200 10.0 7.2 7.1 2

10.1 0000 9.8 2200 9.9 7.2 7.1 3

10.1 2230 9.8 0300 10.0 7.2 7.1 4

10.4 2400 10.0 0600 10.1 7.2 7.1 5

10.5 0230 10.2 1800 10.3 7.2 7.1 6

10.6 2300 10.2 0030 10.4 7.3 7.1 7

10.6 0100 10.4 1300 10.5 7.2 7.1 8

10.5 0000 10.2 1300 10.4 7.2 7.1 H

9 10.6 1900 10.5 0730 10.6 7.3 7.1 3

10 10.8 2400 10.5 0500 10.6 7.2 7.1 11 10.9 2100 10.8 1030 10.9 7.4 7.1 12 11.1 1430 10.8 0130 10.9 7.3 7.2 13 11.2 2000 10.7 1030 10.9 7.2 7.1 14 11.1 0100 10.8 1200 11.0 7.2 7.1 15 11.2 2000 11.0 1500 11.1 7.3 7.1 16 11.1 2000 10.7 1230 10.9 7.2 7.1 17 11.1 2400 10.5 1500 10.8 7.2 7.1 18 11.2 0730 10.9 1800 11.1 7.3 7.1 19 11.2 0300 10.9 2400 11.1 7.3 7.2 20 11.1 2300 10.8 0400 10.9 7.3 7.2 21 11.2 0600 10.8 1500 11.0 7.3 7.2 22 11.0 0800 10.8 2400 10.9 7.2 7.1 23 10.8 1330 10.6 2400 10.7 7.2 7.1 24 10.7 1000 10.5 0500 10.6 7.2 7.1 25 11.1 2300 10.6 0130 10.9 7.2 7.1 26 11.1 0000 11.0 2400 11.0 7.2 7.1 27 11.0 0630 10.8 1700 10.9 7.1 7.0 28 11.4 0930 10.9 0030 11.2 7.1 7.0 29 11.5 1200 11.0 0400 11.3 7.1 7.0 30 11.7 1900 11.3 0100 11.5 7.2 7.0 31 11.9 2130 11.5 1100 11.7 7.1 7.0

I TABLE 4. 2-11 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 NOVEMBER 1981 DISSOLVEC OXYGEN (MG/L)

EH Day Maximum Time Minimum Time Mean Maximum Minimum 1

12.1 1930 11.7 0400 11.9 7.1 7.0 2

12.1 2400 11.7 1530 11.9 7.1 7.0 3

12.2 2400 12.0 0930 12.1 7.1 7.0 4

12.5 0930 12.0 2300 12.2 7.2 7.1 5

12.4 2330 12.0 0200 12.2 7.2 7.0 6

12.5 0930 12.3 1800 12.4 7.2 7.1 7

12.4 1000 12.2 2200 12.3 7.3 7.2 8

12.5 0600 12.3 1500 12.4 7.3 7.2 0

9 12.6 0630 12.3 1900 12.4 7.3 7.2 g

10 12.5 0800 12.2 2130 12.4 7.3 7.2 e

11 12.6 1200 12.3 0000 12.4 7.3 7.2 l

12 12.5 0500 12.3 1630 12.4 7.4 7.2 i

13 12.8 0530 12.5 1800 12.6 7.4 7.3 14 12.8 0400 12.6 1500 12.7 7.4 7.3 l

15 12.9 1400 12.7 0400 12.8 7.4 7.2 l

16 12.9 1200 12.7 0500 12.8 7.3 7.2 17 No Valid Data 7.3 7.1 18 12.9 0130 12.6 1600 12.8 7.2 7.1 19 No Valid Data 7.2 7.1 20 7.2 7.1 21 7.3 7.2 l

22 12.4 2000 12.3 1400 12.3 7.3 7.1 l

23 12.4 0200 12.1 2300 12.2 7.2 7.1 l

24 12.5 2400 12.1 0000 12.3 7.3 7.1 c

25 12.8 2200 12.5 0000 12.6 7.3 7.2 26 12.9 1530 12.7 0500 12.8 7.3 7.2 1

27 13.0 0930 12.8 2130 12.9 7.3 7.2 l

28 12.9 0430 12.7 2000 12.8 7.2 7.1 29 13.1 0700 12.8 1800 12.9 7.3 7.2 30 13.2 1030 12.8 2330 13.0 7.4 7.2 I

m m

M t

0

m

_R n

n_

n n

n n_

n n

n o

o R

TABLE 4.2-12 DISSOLVED OXYGEN AND pH DATA VERMONT YANKEE SAMPLE STATION NO. 7 DECEMBER 1981 DISSOLVED OXYGEN (MG/L) gH Day Maximum Time Minimum Time Mean Maximum Minimum 1

13.0 1100 12.8 0200 12.9 7.3 7.2 2

13.3 2030 13.0 0330 13.2 7.3 7.2 3

13.3 1230 13.0 2330 13.2 7.3 7.2 4

13.2 0800 13.0 2330 13.1 7.3 7.2 5

13.3 1100 13.0 2200 13.1 7.3 7.2 6

13.4 1930 13.0 0030 13.2 7.3 7.2 7

13.5 2300 13.1 0630 13.3 7.3 7.2 8

13.7 1500 13.4 0230 13.5 7.4 7.3 d.

9 13.8 2300 13.5 1000 13.6 7.4 7.3 o

10 13.8 0000 13.6 2100 13.7 7.4 7.2 i

11 13.8 0900 13.5 2030 13.6 7.4 7.2 12 13.7 0530 13.5 2100 13.6 7.4 7.2 13 13.7 2030 13.5 0500 13.6 7.4 7.3 14 13.7 1800 13.5 0630 13.6 7.4 7.3 15 13.7 0430 13.5 2100 13.6 7.3 7.2 16 13.6 0800 13.5 2130 13.6 7.3 7.2 17 13.6 0500 13.4 1630 13.5 7.4 7.3 18 13.6 0200 13.3 1600 13.4 7.3 7.2 19 13.5 0430 13.3 1700 13.4 7.3 7.2 20 13.5 0400 13.3 2200 13.4 7.3 7.2 21 13.5 1900 13.3 1030 13.4 7.3 7.2 22 13.5 0100 13.4 1830 13.4 7.3 7.2 23 13.7 2330 13.4 0830 13.5 7.3 7.2 1

24 13.6 0030 13.4 1700 13.5 7.3 7.2 25 Pump _ Inoperative Pump Inoperative 26 27 28 29 30 31

TABLE 4.3-1 l-VERMONT YANKEE ECOLOGICAL STUDIES CONNECTICUT RIVER, VERNON, VERMONT WATER QUALITY ANALYSIS SAMPLE LOC ATION Monitor 3 Monitor 7 Dise!iarge Date 2/19/81 2/19/81 2/19/81 Dissolved Oxygen 13.9 13.7 13.2 Turbidity (Forma:in Units) 2.8 5.4 4.5 pH (pH Units) 7.20 6.65 7.30 All;olinity (as Ca C0 )

21.1 17.2 18.7 3

Total Hardness (as Ca CO )

26.4 23.4 24.8 3

Calcium Hardness (as Ca CO )

21.5 18.5 20.0 3

Chloride 5.4 5.6 5.2 Sulfate 8.9 8.0 9.3 Total Phosphate (as P) 0.030 0.040 0.040 Total Solids 72 73 61 Suspended Solids 14 15 10 Chromium (Total) 0.002

<0.002

-<0.002 I

Copper

<0.02

<0.02 Iron (Total) 0.30 0.34 0.27 Sodium 3.9 4.0 3.9 Zinc 0.02

<0.02

<0.02 AII Results in mg/l Unless otherwise Noted

-110-

l l

f TABLE 4.3-2 VERMONT YANKEE ECOLOGICAL STUDIES l

CONNECTICUT RIVER, VERNON, VERMONT WATER QUALITY ANALYSIS SAMPLE LOCATION Monitor 3 Monitor 7 Dischorge l

Date 5/26/81 5/26/81 5/26/81 Dissolved Oxygen 10.0 9.6 7.5 l

Turbidity (Formazin Units) 1.4 1.4 2.6 l

pH (pH Units)

~7.30 7.25 7.30 Alkalinity (as Ca C0 )

30.0 31.8 22.0 3

l

' Total Hardness (as Ca CO )

34.9 37.9 78.5 3

Calcium Hardness (as Co C0 )

29.5 32.5 66.9 3

Chloride 4.0 4.4 3.6 Sulfate 8.5 9.0 59.2 Total Phosphate (as P) 0.040 0.030 0.075 Total Solids 64 70 74 Suspended Solids 2.9 2.2 5.3 Chromium (Total) 0.002

<0.002 0.009 l

Copper

<0.02

<0.02 Iron (Total) 0.10 0.23 0.20 Sodium 4.6 4.5 11 1

Zinc

<0.02 0.09 0.12 All Results in mg/l unless otherwise Noted

-111-

I TABLE 4.3-3 VERMONT YANKEE ECOLOGICAL STUDIES CONNECTICUT RIVER, VERNON, VERMONT WATER QUALITY ANALYSIS SAMPLE LOCATION Monitor 3 Monitor 7 Dis $a"r'ge Date 8/27/81 8/27/81 8/27/81 Dissolved Oxygen 8.2 8.2 8.1 Turbidity (Formazin Units) 1.8 1.9 3.2 pH (pH Units) 7.35 7.00 7.80 Alkalinity (as Ca CO )

27.7 27.0 40.5 3

Total Hardness (cs Ca CO )

28.9 30.8 54.7 3

Calcium Hardness (as Ca CO )

23.8 25.5 45.4 3

Chloride 3.8 4.0 9.8 Sulfate 12.8 11.2 24.4

-Total Phosphate (as P) 0.013 0.022 0.026 Total Solids 48 63 112 Suspended Solids 4.5 8.0 4.5 Chromium (Total) 0.004 0.005

<0.002 i

Copper

<0.02

<0.02 0.21 l

Iron (Total) 0.16 0.20 0.32 Sodium 4.0 4.2 8.7 Zinc 0.02 0.03 0.05 All Results in mg/l Unless otherwise Noted t

-112-

I TABLE 4.3-4 l

VERMONT YANKEE ECOLOGICAL STUDIES

~

CONNECTICUT RIVER, VERNON, VERMONT l

WATER QUALITY ANALYSIS l

Plant SAMPLE LOCATION Monitor 3 Monitor 7 Discharge Date 9/22/81 9/22/81 9/22/81 Dissolved Oxygen 8.4 7.9 8.5 Turbidity (Formazin Units) 1.5 1.7 3.3 pH (pH Units)

/.10 7.25 7.40 Alkalinity (as Ca CO )

3 34.8 37.2 24.2 Total Hardness (as Ca CO )

3 41.8 41.2 77.5 Calcium Hardness (as Ca CO )

3 35.0 34.4 64.7 Chloride 6.2 6.3 12.7 Sulfate 9.5 9.7 56 Total Phosphate (as P) 0.015 0.022 0.32 Total Solids 54 50 140 l

Suspended Solids 4.2 4.6 6.4 Chromium (Total) 0.005 0.003 0.003 Copper

<0.02

<0.02 0.26 Iron (Total) 0.14 0.14 0.32 Sodium 5.2 5.6 10 Zinc

<0.02 0.03 l 0.09 All Results in mg/l unless otherwise Noted l

-113-l

TABLE 4.3-5 VERMONT YANKEE ECOLOGICAL STUDIES i

CONNECTICUT RIVER, VERNON, VERMONT ll WATER QUALITY ANALYSIS Plant E

SAMPLE LOCATION Monitor 3 Monitor 7 Discharge 3

Date 10/17/81 10/17/81 10/17/81 Dissolved Oxygen 11.4 10.6 12.1 Turbidity (Formazin Units) 1.9 2.1 2.0 pH (pH Units)

~ 7.30 7.10 7.35 Alkalinity (as Co CO )

3 34.8 33.4 36.6 Total Hardness (as Ca CO )

3 41.6 38.0 41.3 Calcium Hardness (as Ca CO )

3 35.5 32.2 35.2 Chloride 5.0 5.2 5.0 Sulfate 7.1 7.1 8.5 Total Phosphate (as P) 0.012 0.021 0.029 Total Solids 77 75 80 Suspended Solids 3.0 3.8 3.4 Chromium (Total) 0.002

<0.002

<0.002 Copper

<0.02

<0.02 Iron (Total) l 0.21 0.22 0.20 Sodium 4.6 4.6 4.6 Zinc

<0.02

,,,n...,,...,,,...e.........

y

-u 1-l

TABLE 4.3-6 l

VERMONT YANKEE ECOLOGICAL STUDIES CONNECTICUT RIVER, VERNON, VERMONT WATER QUALITY ANALYSIS SAMPLE LOCATION Monitor 3 Monitor 7 DiscEEr'ge Date 11/17/81 11/17/81 Dissolved Oxygen 13.1 12.8 Turbidity (Formazin Units) 1.9 2.2 pH (pH Units)

'7.83 7.82 Alkalinity (as Ca CO )

33.5 34.4 3

Total Hardness (as Co C0 )

40.6 38.3 3

Calcium Hardness (as Co CO )

34.5 32.5 3

Chloride 5.2 5.0 Sulfate 7.0 7.5

~

Total Phosphate (as P) 0.016 0.020 Total Solids 56 48 Suspended Solids 2.2 4.0 Chromium (Total)

<0.002

<0.002 Copper

<0.02 0.02 Iron (Total) 0.22 0.22 Sodium 4.0 4.0 Zinc

<0.02

<0.02 All Results in mg/l unless otherwise Noted

-115-

ru E

[

E l

l SECTION 5 l

[.

E PLANKTON STUDIES E

E

[

E E

E

1 I

I I

5.

PLANKTON STUDIES Plankton samples were collected by pump once each month in 1981 at the downstream and upstream water quality monitors, Stations 3 and 7 (Figure 5.1).

In addition, subsurface samples from the river at Vermont Yankee's condenser cooling water intake structure were collected on the six dates in 1981 on which entrainment studies were conducted.

Samples were collected with a No. 20 mesh Wisconsin plankton net and preserved in 5% formalin.

Subsequently an aliquot of the sample was examined in a Sedgewick-Rafter counting cell.

Plankton were identified to the lowest feasible taxonomic level and were counted as their normally occurring unit, i.e.,

phytoplankters as cells, colonies, or filaments and zooplankters as individuals or colonies.

The results of these analyses are presented below.

5.1 Phytoplankton Studies A summary of the counting results of the analysis of the 1981 phytoplankton samples is given in Table 5.1.

This table shows for each sample the dominant species observed, when one taxon was found in greater numbers than any other one, the concentration in units per liter of that dominant organism, and the total count in units per liter of all algae in the sample.

The concentrations of phytoplankters found in the 1981 monitor samples are also shown graphically in Figures 5.2 and 5.3.

To permit ready comparison of the 1981 monitor sample data with that of earlier years, Figures 5.2 and 5.3 also carry plots of the monthly mean phytoplankton counts observed in the years 1970-1974, excluding data collected in 1974 during Vermont Yankee's open cycle testing.

Variability of algal concentrations about these means is

-117-

e I

7 l-h PLANKTON SAMPLE STATION i

g LOCATIONS I

I o

in SCALE IN MILES h

NEW H AM PSHIR E I

VERMONT g

s6 Vermont Yankee I-D, I'

l I

3 FIGURE 5.1

-118-

I TABLE 5.1 DOMINANT PHTIOPLANKION SPECIES (Daninant Species Count /Ibtal Count in Units Per Liter) 1981 SAMPLE IDCATION Date,

bbnitor 7 Monitor 3 e

1/14 Pediastrum Fragilaria simplex capucina (4/55)

(4/38) 1/15 Oscillatoria sp.

(6/22) 2/12 bblosira italica (76/400) 2/18 None Melosira

(-/64) varians (18/59) 3/17 bblosira None italica

(-/17)

(7/31) 3/24 Asterionella fonnosa (15/40) 4/8 Oscillatoria spp.

(49/256) 4/15 Melosira Melosira italica italica (203/366)

(22/68) 5/5 Asterionella fonnosa (578/1022) 5/14 Melosira Asterionella italica fonnosa (90/981)

(205/1315) 6/17 Melosira Melosira italica italica (115/418)

(67/338) 7/14 Fragilaria Fragilaria crotonensis crotonensis (533/1060)

(544/915) 8/27 Aphanizmenon Aphanizanenon flos-aquae flos-aquae (17935/20740)

(8500/11090) 9/22 Melosira Tabellaria italica fenestrata (218/641)

(180/494) 10/20 Fragilaria Fragilaria crotonensis crotonensis (29/151)

(27/116)

I 11/16 Melosira Melosira italica italica (40/276)

(18/60) 12/10 Nitzschia sp.

Asterionella Fragilaria spp.

(52/438) formosa (8/38)

(14/50)

-119-

l SEASONAL PHYTOPLANKTON DISTRIBUTION STATION NO.7 - MONITOR i

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FIGURE 5. 2

-120-

I j

SEASONAL PHYTOPLANKTON DISTRIBUTION STATION NO.3 MONITOR 50

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FIGURE 5. 3

!I

-121-

I indicated on the graphs by points which are two standard deviations greater than each monthly mean.

Algal concentrations in both the Station 3 and the Station 7 samples of January, May, and August 1981 were greater than the corresponding mean concentrations of the years 1970-74.

The May samples at both locations had phytoplankton concentrations more than two standard deviations above the 1970-74 means.

Station 7 samples of February, April, and December also had algal concentra-tions greater than the 1970-74 means.

The December algal count exceeded the 1970-74 mean by more than two standard deviations.

In earlier reports of this series (Aquatec 1975, 1976), a statistical analysis of the phytoplankton data collected prior to Vermont Yankee's operation and during closed cycle operation at the two monitor stations was presented.

This analysis developed linear regression equations which predicted Monitor 3 counts from three ranges of observed Monitor 7 counts.

Monitor 7 counts observed on nine dates in 1981 lie within the low range, 0-772 units per liter, for which the regression equation has an intercept of 23.3, a regression coefficient of 0.802, and a standard error of estimate of 193.

A comparison of the phytoplankton counts observed at Monitor 3 in 1981 with counts predicted by this regression equation from counts observed at Monitor 7 is shown in Table 5.2.

All differences between the observed and the predicted concentra-tions for Station 3 are less than two standard errors of estimate (386).

The Monitor 7 phytoplankton concentrations observed in May and July fell within the middle range of counts used in the statis-tical analysis of preoperational and closed cycle data.

The regres-sion equation developed for this middle range, Monitor 7 counts of 772-7282, has an intercept of -483 and a regression coefficient 1

l of 0.912.

For the Monitor 7 count of 981 observed on May 14, the Monitor 3 concentration calculated from this equation is 412; the I

observed concentration was 1315.

The Monitor 3 concentration cal-j culated from the Monitor 7 July algal count of 1060 is 484; the

-122-

[

)

[

TABLE 5.2

[

COMPARISON OF OBSERVED MONITOR 3 PHYTOPLANKTON COUNT WITH MONITOR 3 COUNT PREDICTED BY REGRESSION ANALYSIS l

OF LOW RANGE PREOPERATIONAL/ CLOSED CYCLE MONITOR DATA, 1970-1974

[

Monitor 7 Count Monitor 3 Count Date Observed Observed-Predicted = Difference 1/14/81 55 38 73

-35

{

2/18/81 64 59 81

-22 3/17/81 31 17 54

-37 4/15/81 366 68 323

-255 6/17/81 418 338 365

-27 I

[

{

9/22/81 641 494 543

-49 10/20/81 151 116 150

-34 11/16/81 276 60 251

-191

{

12/10/81 438 38 381

-343

[

observed count was 915.

In both cases, the difference between the observed and the predicted concentrations is less than one stan'dard

{

error of estimate (2443) for the regression equation.

The algal count observed in the August 27 sample at Monitor 7

{

was 20,740 units / liter.

This was only the second Monitor 7 sample since 1974 that had a total count greater than 7282, the maximum count used in the statistical analysis of the middle range of phyto-plankton concentrations.

Only one prior Monitor 7 sample has been observed to have a higher algal concentration than the August 1981 sample.

The September 13, 1973 phytoplankton count at Station 7 was 45,231 units / liter.

Using the regression analysis developed

[

for the high range of Monitor 7 counts (>4000), the Monitor 3 count predicted from the 20,740 observed at Monitor 7 is 20,313; the

{

count observed was 11,090.

The difference, 9223, is less than one standard error of estimate, 9692, for'the high range analysis.

{

Forty-fou'r species of phytoplankton were identified in the samples collected at Stations 3 and 7 in 1981.

Five additional taxa were found in small numbers in the sa.aples of river water collected at Vermont Yankee's intake structure during entrainment

-123-

studies.

A checklist of the phytoplankton identified in these samples is shown in Table 5.3.

Following the name of each taxon in the list are three numbers in parenthesis.

The first is the number of Station 3 samples in which the alga was observed; the second is the number of Station 7 samples in which it was found; the third is the number of entrainment sample dates on which the taxon was found in a river intake sample.

The average number of identified species found in the twelve upstream Station 7 samples of 1981 was 9.2; in the downstream Station 3 samples, the mean number was 9.1.

The number per sample at Station 7 ranged from 5 identified species in January and August to 14 in the September sample.

At Station 3, the smallest number observed was 4 species in the March sample; the largest number identified was 16 species in the May sample.

As in all earlier years of Vermont Yankee phytoplankton studies, species of diatoms predominated in most of the 1981 samples.

Diatoms constiinted more than half the algae in Monitor 7 samples except that of August, in all Monitor 3 samples except those of March and August, and in all the entrainment intake samples excer;t the January sample.

A summary of the percentages of diatoms, flagellates, green, and blue-green algae found in the 1981 phytoplankton samples is given in Table 5.4.

TABLE 5.4 MEAN PERCENTAGES AND PERCENTAGE RANGES DIATOMS, FLAGELLATES, GREEN AND BLUE-GREEN ALGAE 1981 I

Diatoms I FlagIllates {

Blue-Greens l Greens S

e Percentage Percentage Percentage Percentage Range Mean Range Mean Range Mean Range Mean Monitor 7 14-97 77 0-6.5 0,9 0-20 7.8 0-86 9.5 l

W Intake 44-91 77 0-2.1 0.4 0-8.0 2.4 0-28 11 Monitor 3 23-95 77 0-9.5 2.1 0-12 4.3 0-77 8.9 l

-124-

The more commonly observed species in the 1981 phytoplankton samples were the same as those of previous years of study.

Asterionella formosa. Fragilaria capucina and F.

crotonensis, Melosira italica and M. varians, and Tabellaria fenestrata were the predominant diatoms.

Melosira italica was found in all the monitor and the intake samples.

The more commonly encountered flagellates were Dinobryon spp. and the more frequently observed green algae were species of Pediastrum, particularly P.

simplex.

I The more common blue-greens throughout the year were Oscillatoria spp.

In the August samples at both the upstream and downstream locations, however, unusually high concentrations of the blue-green Aphanizomenon flos-aquae, were found.

I

-125-

TABLE 5.3-1 CHECKLIST OF THE PHYTOPLANKTON OF THE CONNECTICUT RIVER E

NEAR VERNON, VERMONT E

1981 A listing by genus only that follows named species of the same genus represents species other than the preceding ones.

The numbers in parenthesis after each listed taxon are:

(the number of Station 3 samples of 12 - the number of Station 7 samples of 12/the number of entrainment intake sample sets of 6 in which the taxon was observed).

BACILLARIOPHYCEAE Asterionella formosa (9-5/6)

Diatoma vulgare (1-0/1)

I Diatoma spp. (2-1/1)

E Fragilaria capucina (8-9/6)

E l

Fragilaria crotonensis (10-11/5)

Melosira granulata (2-2/1)

Melosira italica (12-12/6)

Melosira varians (7-4/5)

Meridion sp. (0-1/0)

Nitzchia sigmoidae (0-1/0)

E Nitzchia sp. (1-3/0)

E Surirella sp. (3-1/4)

Synedra acus (0-0/1)

E Synedra spp. (4-7/4)

E Tabellaria fenestrata (7-8/4)

Tabe11 aria flocculosa (2-2/0)

Tabellaria sp. (0-1/0)

CHRYSOPHYCEAE Dinobryon sertularia (1-0/1) g Dinobryon spp. (2-4/2) 3 Hydrurus sp. (1-0/0)

Synura Adamsii (1-0/0)

Synura sp. (0-0/1)

Uroglenopsis americana (1-0/1)

PYRRHOPHYCEAE E

Ceratium hirundinella (2-2/0)

E I

-126-

l TABLE 5.3-2 CHLOROPHYCEAE I

Actinastrum sp. (0-1/0)

Ankistrodesmus sp. (1-0/0)

Cladophora sp. (0-1/0)

Closterium sp. (1-1/0)

Micractinium sp. (1-0/0)

Pediastrum araneosum (0-1/0)

Pediastrum boryanum (1-0/0)

Pediastrum duplex (0-5/2)

Pediastrum simplex (6-10/5)

Pediastrum simplex var. duodenarium (0-0/1)

Scenedesmus dimorphus (0-1/0)

I Scenedesmus quadricauda (1-3/1)

Scenedesmus sp. (3-0/0)

Spirogyra spp. (4-2/0)

Staurastrum sp. (0-1/0)

Stigeoclonium sp. (3-0/1)

Ulothrix zonata (1-1/ 2)

Ulothrix spp. (2-2/1)

RHODOPHYCEAE Audouinella sp. (C-0/1)

I CYANOPHYCEAE Anabaena sp. (1-0/0)

Aphanizomenon flos-aquae (2-2/0)

Lyngbya spp. (1-1/3)

Merismopedia sp. (0-0/1)

Microcystis sp. (1-0/1)

Oscillatoria spp. (4-5/6)

I t

-127-1

r 5.2 Zooplankton Studies The results of the analysis of zooplankton samples in 1981 are summarized in Table 5.5 and in Figures 5.4 and 5.5 Table 5.5 shows the concentration, in units per liter, of zooplankters observed in each sample and the name and concentration of the predominant taxon in the sample, when one taxon was observed in greater concentration than any other.

In the figures, total zoo-plankton counts observed in 1981 at the two monitor stations are plotted, along with monthly mean counts observed at these stations in the years 1970-1974, excluding times of open cycle testing.

To show variability about the means, the figures also carry plots of the means plus two standard deviations.

Concentrations of zooplankters in all the downstream Monitor 3 samples of 1981 were less than means of the years 1970-74.

But three of the Monitor 7 upstream samples in 1981 had zooplankton counts that exceeded the 1970-74 means, the samples of March, June, and November.

In June, when Vermont Yankee was operating in the closed cycle cooling mode, and in November, when Vermont Yankee was shutdown for annual refueling, the Monitor 7 zooplankton counts were more than two standard deviations greater than the 1970-74 means.

In both those samples, high concentrations of the rotifer, Philodina sp., were present.

Statistical analysis of zooplankton data collected at the two monitor stations in the yeers 1970-1974, prior to Vermont Yankee's operation and during closed cycle operation, has provided a basis

~

for comparison of zooplankton counts observed at Monitor 3, down-stream of Vermont Yankee, with counts predicted from the zooplankton concentrations observed at Monitor 7 upstream.

This analysis, analogous to that used for phytoplankton, resulted in a linear regression equation relating Monitor 3 count, as dependent variable, to the observed Monitor 7 count.

For Monitor 7 counts ranging from 0.5 to 418.5, the equation has a regression coefficient of 0.918, an intercept of 15.7, and a standard error of estimate of 83.8.

A comparison of the zooplankton concentrations observed in 1981 at

-128-

L

[

E TABM 5.5 DOMINANT ZOOPIANKION TAR

[

(Dcrninant Tarn Count /lbtal Count in Units Per Liter) 1981 SAMPE IDCATICN Date Monitor 7 M nitor 3 e

1/14 Vorticella sp.

None (4.5/6.5)

(-/1.5) 1/15 None

[

(-/2. 5) 2/12 None

(-/3.2)

{

2/18 Vorticella sp.

None (3.5/9.0)

(-/3.0) 3/17 Vorticella sp.

Copepoda Nauplii E.

(12.0/15.5)

(1.5/2.0) 3/24 -

Copepoda Nauplii (1.0/1.2) 4/8 Copepoda Nauplii

(

(1.5/2.8) 4/15 None nnpamaa Nauplii

(-/4.0)

(1.0/2.0)

{

5/5 Conochilus sp.

(1.2/5.5) 5/14 Copepoda Nauplii nnpamda Nauplii (2.0/6.0)

(2.0/7.5)

[

6/17 Philodina sp.

None (143.0/146.0)

(-/7.0) 7/14 Philodina sp.

Keratella (30.0/56.5) oochlearis (2.5/12.5) 7 727 Philodina sp.

Keratella r

(11.0/17.0) cochlearis L

(2.5/4.5) 9/22 Philodina sp.

None (5.5/13.0)

(-/7.5)

[

10/20 Philodina sp.

Vorticella sp.

(3.0/6.0)

(2.5/4.5) 11/16 Philodina sp.

Philodina sp.

f (215.0/219.0)

(8.5/11.5)

L 12/10 Philodina sp.

None None (4.0/9.5)

(-/2.5)

(-/1.0) l E

L IL

-129-

l SEASONAL ZOOPL ANKTON DISTRIBUTION MONITOR STATION NO.7 8

7 4

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6-l 'I I

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-.--- - w -) q - = g ll l 12 l 10 l l8 l

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5 6

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2 MONTHS 19 81 1970 - 74 MEAN MEAN + 2 STD. DEV.

FIGURE 5. 4

-130-

i SEASONAL ZOOPL ANKTON DISTRIBUTION STATION NO. 3 MONITOR 8

~

l i f!

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l 10 l l

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a 2

7 8

12 6

9 11 MONTHS 39g;

" - - - - " ~

1970 - 74 MEAN MEAN + 2 STD. DEV.

FIGURE 5. 5

-131-

l Monitor 3 with those predicted by this equation is given in Table 5.6.

TABLE 5.6 COMPARISON OF OBSERVED MONITOR 3 ZOOPLANKTON COUNT WITH MONITOR 3 COUNT PREDICTED BY REGRESSION ANALYSIS OF PREOPERATIONAL/ CLOSED CYCLE MONITOR DATA, 1970-1974 Monitor 7 Count Monitor 3 Count Date Observed Observed-Predicted = Difference 1/14/81 6.5 1.5 21.7

-20.2 2/18/81 9.0 3.0 24.0

-21.0 3/17/81 15.5 2.0 29.9

-27.9 4/15/81 4.0 2.0 19.4

-17.4 5/14/81 6.0 7.5 21.2

-13.7 6/17/81 146.0 7.0 149.7

-142.7 7/14/81 56.5 12.5 67.6

-55.1 8/27/81 17.0 4.5 31.3

-26.8 9/22/81 13.0 7.5 27.6

-20.1 10/20/81 6.0 4.5 21.2

-16.7 E

11/16/81 219.0 11.5 216.7

-205.2 E

12/10/81 9.5 1.0 24.4

-23.4 The difference between the Monitor 3 count observed in November and that predicted by the regression equation from the observed Monitor 7 count is greater than two standard errors of estimate (167.6); all other such differences in 1981 were smaller than 167.6 units / liter.

A checklist of the zooplankton observed in 1981 is given in Table 5.7 at the end of this section of the report.

Organisms observed in entrainment samples collected from the river at Vermont Yankee's intake structure are included in the list.

The three numbers in parenthesis following the name of each taxon in the list are:

the number of Station 3 samples, of 12; the number of Station 7 samples, of 12; and the number of entrainment intake samples, of l

6, in which the taxon was observed.

Of the 43 taxa in the list, 5 were observed only in entrainment intake samples, 6 only in Monitor l

3 samples, and 10 taxa were found only in the Monitor 7 samples.

1

-132-

The number of taxa observed in the Monitor 3 samples ranged from 2 in the December sample to 12 in the July sample; the average number of taxa in the twelve samples was 5.8.

The mean number of taxa found in the twelve Monitor 7 samples was 6.9.

The largest number found was 18 in the July sample; the smallest number, 3,

in the November sample.

Protozoans, particularly Vorticella sp., were common in the monitor samples of fall and winter and copepods were found in samples throughout the year.

Copepod nauplii were present in 80%

of the monitor and entrainment samples.

But the dominant zooplank-ters in the 1981 samples, as in those of earlier Vermont Yankee zooplankton studies, were rotifers.

Fifty percent or more of the organisms were rotifers in 7 of the Monitor 3 samples, in 8 of the Monitor 7 samples, and in 3 of the 6 entrainment intake sample sets.

Keratella cochlearis, Philodina sp., and Polyarthra sp. were the more commonly observed rotifers.

A summary of the percentages of protozoa, copepoda, cladocera, and rotatoria observed in the 1981 zooplankton samples is given in Table 5.8.

TABLE 5.8 MEAN PERCENTAGES AND PERCENTAGE RANGES PROTOZOA, COPEPODA, CLADOCERA, AND ROTATORIA 1981 Protozoa Copepoda Cladocera Rotatoria Sample Peme % e Perce % e Pe m % e Pene % e Range Mean Range Mean Range Mean Range Mean Monitor 7 0-77 20 0-33 10 0-8.8 1.2 15-99 61 1

VY Intake 0-16 5.0 10-83 35 0-0 0

17-80 49 Monitor 3 0-78 15 0-75 25 0-14 3.3 0-96 47

-133-

TABLE 5.7-1 CHECKLIST OF THE ZOOPLANKTON OF THE CONNECTICUT RIVER NEAR VERNON, VERMONT 1981 Zooplankters are listed in the lowest taxonomic level to which identification was made.

A listing by genus only that follows named species of the same genus represents species other than those previously listed.

The numbers in parenthesis after each listed taxon are:

(the number of Station 3 samples of 12 - the number of Station 7 samples of 12/the number of entrainment intake sample sets of 6 in which the taxon was observed).

PROTOZOA Campanella sp. (1-1/1)

Vorticella sp. (3-6/2)

NEMATODA Indet. (4-7/1)

NEMATOMORPHA Indet. (0-0/1)

ROTATORIA Ascomorpha sp. (1-1/1)

Brachionus calyciflorfus (1-1/0)

Cephalodella sp. (2-1/0)

Conochilus unicornis (0-1/1)

Euchlanis dilatata (1-1/0)

Euchlanis meneta (0-1/0)

Euchlanis sp. ( 0-1/(j )

Pilinia terminalis 0-1/0)

Filinia sp. (0-0/2)

Kellicottia bostoniensis (1-1/2) l Kellicottia longispina (2-1/1)

Keratella cochlearis (6-6/4)

Keratella quadrata (1-0/1)

Notholca prob, laurentiae (0-0/1)

Philodina sp. ( 6-10/ 2)

Ploesoma hudsoni (0-1/0)

Ploesoma sp. (1-0/0)

Polyarthra prob. dolichoptera (0-1/0)

Polyarthra sp. (4-6/1)

Synchaeta sp. (1-2/1)

Trichocerca sp. (2-1/0)

Trichotria sp. (1-1/0)

-134-

L I"

TABLE 5.7-2

[

TARDIGRADA Indet. (1-1/3)

{*

ANNELIDA Indet. (3-2/3) p ARTIIROPODA L

Crustacea Cladocera Alonella sp. (0-1/0)

[

Bosmina coregoni (1-2/0)

Bosmina longirostris (1-0/0)

Bosmina sp. (0-1/0)

{

Cniaptocercus sp. (1-0/0)

Chydorus sphaericus (1-0/0)

Daphnia pulex (1-0/0) p Daphnia sp. (0-1/0)

L Diaphanosoma sp. (0-1/0)

Pleuroxus sp. (0-1/0)

Sida crystallina (1-0/0)

[

Ostracoda Indet. (0-0/1)

Copepoda Indet. Adults (2-4/5)

{

Indet. Nauplii (9-9/6)

Arachnoidea Ilydracarina Indet. (0-0/1)

[

r m

-135-Eii

u lI l

I l

SECTION 6 l

ENTRAINMENT STUDIES I

I I

I

L F

F L

b

[

6.

ENTRAINMENT STUDIES

{

Because studies of the entrainment of phytoplankton and zoo-plankton in Vermont Yankee's condenser cooling water, conducted twice a month from 1973 to 1980, had shown the impact un the river populations of these organisms to be minimal, the schedule of entrainment sampling required of Vermont Yankee was reduced in 1980 to one sample set per month during times of open cycle operation.

Six sets of condenser cooling water intake and dis-

[

charge samples were collected and analyzed in 1981.

For each sample, 40 liters of water, collected by bucket, were

[

poured through a No. 20 mesh plankton net.

A portion of the fresh sample concentrate was examined within the hour to determine the

{

identity and relative numbers of living and dead organisms.

Zoo-plankters were tabulated as living if they were observed to move or showed internal movement within one minute.

Phytoplankters were listed as living if they had normal pigmentation and no signs of plasmolysis.

The remaining portion of each sample was preserved with formalin for subsequent identification and enumeration of the organisms present.

The taxa of phytoplankton and zooplankton found in the entrain-ment intake samples in 1981 are indicated in the two checklists,

[

Tables 5.3 and 5.7, of the previous section of this report.

In those lists, the third number in parenthesis after each taxon is the number

{

of sample dates, of a total of 6, on which the taxon was observed in an intake sample.

In general, the same taxa were observed in dis-charge samples as were found in river intake samples.

Five algal species, however, were observed in discharge samples in 1981 that were not found in the intake samples.

These were Gomphonema sp.,

Micrasterias sp., oedogonium sp., Gomphosphaeria naegeliana, and

['

-137-l

Oscillatoria splendida.

One zooplankter, Notholca acuminata, not found in an intake sample, was observed in a May discharge sample.

The counting results of the analysis of the fresh and the preserved entrainment samples are summarized in Table 6.1.

The data of Table 6.1 have been used to calculate the percent changes in live plankton concentrations between intake and discharge samples shown in Table 6.2.

The impact of Vermont Yankee's entrainment of plankton on the river's concentration of live plankton is dependent upon the pro-portion of river flow, O, which is utilized as condenser cooling R

water.

During open cycle operation, plant discharge flow rate, O' D

equals the rate of intake from the river, thus percent change of plankton concentration in tha mixed river is the percent change through the plant, Table 6.2, multiplied by the ratio of O O.

D g

Calculations of the percent changes in river plankton concentra-tions due to entrainment on the 6 study dates of 1981 are shown in Table 6.3.

These calculations assume uniform distribution of river plankton at the intake structure and complete mixing of plant dis-charge into the river.

The calculated changes in river concentrations of living phyto-plankton range from +29% in January to -2.9% in May.

For living zooplankton, the range is from +24% in March to -3.6% in January.

These increases in plankton concentration, which have been observed in all prior years of study, are attributable to the sloughing off into Vermont Yankee's circulating cooling water of algal growth g

attached to the walls of the cooling water system, growth that E

supports a community of microinvertebrates.

I I

l

-138-

TABIE 6.1 SUMMAIN OF RESULTS VEIMNT YANKEE HNEfr SIUDIES 1981 Power Percent Living Organisms hunber Organisms / Liter Invel Condenser Sample Sample (Fresh sample)

(Preserved Sample)

Date

(%)

o T('F)

Iocation Tmp. ( F)

Phytoplankton Zooplankton Phytoplankton Zooplankton 1/15 99.4 27.6 Intake 36.7 4

50 22 2.5 Discharge 74.1 19 38 24 1.5 E

2/12 99.4 29.9 Intake 32.0 29 75 400 3.2 Discharge 61.7 26 93 2430 5.5 3/24 99.5 26.8 Intake 37.9 88 40 40 1.2 Discharge 70.0 76 83 44 2.0 4/8 99.3 27.0 Intake 45.3 81 83 256 2.8 Discharge 71.4 54 71 107 2.0 5/5 99.5 20.6 Intake 54.3 92 83 1022 5.5 Discharge 73.8 81 75 751 4.5 12/10 77.3 21.8 Intake 61.2 92 12 50 2.5 Discharge 83.1 98 50 113 1.8

TABLE 6.2 PEF 02E OIAtCES IN LIVE PIRWION CONO2TfRATIGE BEIWEE21 ENTRAINME2R INIAKE AND DISOIARGE SAMPLES Idving Organisms Per Liter

% Change Date Parameter Discharge Intake Difference thru Plant

=

1/15/81 Phytoplankton 5

1

+4

+400 Zooplankton 0.6 1.2

-0.6

-50 1

[

2/12/81 Phytoplankton 632 116

+516

+440 o

Zooplankton 5.1 2.4

+2.7

+110 e

3/24/81 Phytoplankton 33 35

-2

-5.7 Zooplankton 1.7 0.5

+1.2

+240 4/8/81 Phytoplankton 58 207

-149

-72 Zooplankton 1.4 2.3

-0.9

-39 5/5/81 Phytoplankton 608 940

-332

-35 Zooplankton 3.4 4.6

-1.2

-26 12/10/81 Phytoplankton 111 46

+65

+140 Zooplankton 0.9 0.3

+0.6

+200 m

TABLE 6.3 CMCUIATED PEICENT CULNGES IN LIVE PIANKION CONCENTPATIOS OF RIVER rrru;rra BY DTURAIMEff Plant River Percent 01ange in Live Plankton Permnt Discharge Flow Concentrations in Mixed River Date Pccirculation OD (cfs)_

OR (cfs)

Phytoplankton Zooplankton 1/15/81 30 407 5670

+29

-3.6 5y 2/12/81 0

537 26670

+8.9

+2.2 3/24/81 19 485 4900

-0.56

+24 4/8/81 0

590 18560

-2.3

-1.2 5/5/81 0

775 9240

-2.9

-2.2 12/10/81 54 262 11740

+3.1

+4.5

t r

W I

IL F

L r

L SECTION 7 r

rL, BENTHIC FAUNA STUDIES E

E N

M A

1

)

I l

l l

L.

L FL EL

[

7.

BENTHIC FAUNA STUDIES

{

In compliance with the conditions of Vermont Yankee's NPDES permit, samples of Connecticut River benthos were collected by Ekman dredge and Henson trap at four sample stations.shown in Figure 7.1.

Ekman dredge samples were collected monthly, from May through November, at each of the four stations, except that

[

high river flows precluded sampling at Station 3 in September.

Each Ekman dredge sample consisted of the organisms collected in

[

30 dredge hauls, 10 from each quarter point of the river.

Henson traps, wire cages filled with 2 to 3 inch diameter rocks, were

{

set at each location in April, June, and August and left in place for 8 to 10 weeks before retrieval.

The trap set at Station 3 in June was vandalized.

[

The material collected by either sample method was washed through a set of standard sieves and organisms retained by a No.

f 25 mesh sieve were preserved in 70% alcohol for subsequent analy-I sis.

Identification was made to the lowest practicable taxonomic b

level, usually to genus.

A list of the benthic fauna found in these 1981 samples is b

given in Table 7.1 at the end of this section of the report.

The number of samples in which a listed taxon was found is shown in

[

the table for each sampling technique at each station.

l Excluding the organisms listed as indeterminate that are not

[

known positively to be different from other identified taxa, 128 taxa were found in the 1981 samples.

Sixty taxa were observed in

{

the Station 2 samples, 59 in the Station 3 samples, 69 in the Station 4 samples, and 67 taxa were found in the samples at Station 5.

{

Of the 107 genera found in the 1981 samples, 69 were observed in the 11 Henson trap samples,and 90 genera were found in the samples E

-143-

l I

I

(\\

BENTHIC FAUNA l

i i

SAMPLE STATION LOCATIONS I

O I

SCALE IN MILES "4

I g

I i

vermont Yankee 9

NEW HAMPSHIRE W

VERMONT 2

I I

(

l M ASS ACHUSETTS i

FIGURE 7.1

-144-L

N

~

L collected by Ekman dredge.

Fifty-two genera were found in samples collected by both sampling techniques, 17 were observed only in the lienson trap samples, and 38 were found only in the Ekman dredge samples.

The number of samples collected by Ekman dredge in 1981 was comparable to the numbers collected at Stations 2 through 5 in the

{

years 1969 and 1977-80.

A comparison of the number of genera collected by Ekman dredge in these years with the results of the r

1981 collections is shown in Table 7.2.

L TABLE 7.2 COMPARISON OF NUMBER OF SAMPLES AND NUMBER OF GENERA OF BENTIIOS COLLECTED BY EKMAN DREDGE Station Number of Samples / Number of Genera l

Number 1969 1977 1978 1979 1980 1981 2

6/23 8/20 8/22 7/27 7/36 7/40 3

6/24 8/25 8/13 7/26 7/39 6/41 4

7/16 8/19 8/17 7/26 7/30 7/35 5

8/18 8/20 6/14 7/28 7/25 7/44 The number of genera in 1981 was greater at all four stations than in earlier years, even at Station 4 where only six samples were collected in 1981.

l The results of the analysis of the 1981 benthic fauna samples are summarized in Table 7.3.

The summary shows for each sample the I

number of organisms and taxa observed and lists the predominant type of benthos in the sample and the percentage of that form in l

the sample.

A diversity index is also tabulated for each sample.

The index was calculated with the following equation:

(

d=

(Nlog10 " '

"i 910 "i) where C is a constant which converts logarithms from base 10 to base 2; N is the number of organisms; and n.

is the number of organisms in the i b axon.

b t

-145-

ll Caddis fly and chironomid larvae were the predominant organisms in most of the spring and summer samples.

This has been found to be the case in prior years of study.

These forms were again preva-lent in the late fall samples.

Early fall samples showed a greater variety of dominant forms - tubificids, planarians, and fingernail clams.

This, also, has been observed in earlier years.

In general, no marked pattern of difference in diversity or abundance of benthic organisms was observed between Station 5, upstream of Vermont Yankee, and Stations 2, 3, and 4, which might have been affected by Vermont Yankee's discharge.

-147-

)

TABLE 7.3-1

SUMMARY

OF RESULTS OF ANALYSIS BENTHIC FAUNA SAMPLES 1981 Sample Method Number of Number of Number Diversity Predominant Form (s)

HT (#fDays)

Sample Benthic Organisgs of Index

% of Date ED (# Hauls)

Station Organisms per m Taxa d

Name(s)

Total 5/19 ED (30 hauls) 2 42 27 17 3.37 Caddis flies 40 5/29 ED (30 hau2s) 3 5

3 5

2.32 Caddis flies 60 5/18 ED (30 hauls) 4 55 35 16 3.48 Chironomids 38 5/19 ED (30 hauls) 5 58 37 13 3.00 Chironomids 34 6/23 ED (30 hauls) 2 36 23 17 3.43 Caddis flies 39 ED (30 hauls) 3 33 21 8

2.15 Caddis flies 70 1

6/24 ED (30 hauls) 4 27 17 11 2.98 Chironomids 70 ED (30 hauls) 5 28 18 6

1.72 Chironomids 89 6/23 HT (60 days) 2 35 16 3.69 Chironomids 46 HT (60 days) 3 230 15 1.69 Amnicolid snails 64 6/24 HT (61 days) 4 114 26 3.63 Chironomids 61 l

HT (61 days) 5 22 8

2.61 Aquatic sow bugs 36 7/23 ED (30 hauls) 2 109 70 16 2.90 Caddis flies 51 ED (30 hauls) 3 148 94 18 2.58 Cladocerans 41 l

7/24 ED (30 hauls) 4 25 16 7

1.95 Mayflies 60 l

ED (30 hauls) 5 100 64 18 2.63 Chironomids 72 8/19 ED (30 hauls) 2 53 34 18 3.38 Bryozoans 30 8/25 ED (30 hauls) 3 235 150 24 2.45 Caddis flies 66 l

l 8/21 ED (30 hauls) 4 77 49 18 3.57 Chironomids 40 l

ED (30 hauls) 5 74 47 22 3.92 Chironomids 38 i

TABLE 7.3-2

SUMMARY

OF RESULTS OF ANALYSIS BENTHIC FAUNA SAMPLES 1981 Sample Method Number of Number of Number Diversity Predominant Form (s)

HT (# Days)

Sample Benthic Organisms of Index

% of Date ED (+# Hauls)

Station Organisms per m2 Taxa d

Name(s)

Total 8/25 HT (63 days) 2 175 19 2.96 Chironomids 61 8/26 HT (63 days) 4 98 22 3.49 Chironomids 49 HT (63 days) 5 143 27 3.23 Chironomids 61 9/23 ED (30 hauls) 2 85 54 12 2.47 Oligochaetes 41 9/25 ED (30 hauls) 4 86 55 19 3.23 Tubificids 38 EC (30 hauls) 5 59 38 20 3.81 Chironomids 49 10/23 ED (30 hauls) 2 20 13 6

2.39 Fingernail clams 45 7

ED (30 hauls) 3 31 20 13 3.15 Fingernail clams 35 10/22 ED (30 hauls) 4 13 8

2 0.78 Fingernail clams 77 ED (30 harls) 5 39 25 10 2.73 Tubificids 44 10/23 HT (57 days) 2 6

4 1.79 Planarians 50 HT (57 days) 3 116 14 2.76 Chironomids 41 10/22 HT (56 days) 4 134 25 3.39 Chironomids 36 HT (56 days) 5 87 10 2.18 Planarians 48 11/18 ED (30 hauls) 2 32 20 9

2.65 Fingernail clams 34 ED (30 hauls) 3 127 81 12 1.70 Caddis flies 83 11/17 ED (30 hauls) 4 19 12 10 2.92 Chironomids 63 ED (30 hauls) 5 54 34 15 3.34 Chironomids 43

TABLE 7.1-1 i

CHECKLIST OF THE BENTHIC FAUNA 0F THE CONNECTICUT RIVER NEAR VERNON, VERMONT 1981 Number of samples in which a taxon was observed at each sample location in collections made by Henson trap and Ekman dredge Sample Station Number Collection Method (No. Samples Collected) 2 3

4 5

HT(3) ED(7) HT(2) ED(6) HT(3) ED(7) HT(3) ED(7)

PORIFERA (Sponges)

Demospongia 4

Indet. Spongillidae 0

2 0

1 0

0 1

0 COELENTERATA (Hydroids, Jellyfish)

Hydrozoa l

Indet. polyp 0

0 0

2 1

0 1

0 PLATYHELMINTHES Turbellaria (Flatworms)

Dugesia tigrina 2

5 1

4 3

1 2

0 Dugesia sp.

1 0

0 1

0 0

BRY0Z0A (Moss Animacules) l Gymnolaemata Paludicella articulata 2

2 0

0 l

1 l

Phylactolaemata Cristatella mucedo 0

1 0

0 0

0 Pectinatella magnifica 0

2 0

1 0

0 0

0 l

Plumatella repens 1

0 0

0 l

l l

l M

M M

^

R R

R M

R R

F7 FR FR FR FR F1 F1 f

~1

.F 1

1 TA3LE 7.1-2 Sample Station Number Collection Method (No. Samples Collected) l 2

3 4

5 l

HT(3) ED(7) HT(2) ED(6) HT(3) ED(7) HT(3) ED(7)

ANNELIDA Oligochaeta (Aquatic Earthworms) l Branchiura sowerbyi 0

0 0

1 0

2 0

4 Haplotaxis sp.

0 0

0 1

0 0

0 1

I Limnodrilus sp.

2 0

0 0

3 4

2 5

Lumbriculus sp.

0 2

0 0

1 1

0 1

Peloscolex sp.

0 0

0 1

0 0

Stylaria fossularis 0

2 0

0 0

0

_Stylaria sp.

0 0

1 0

0 0

Tubifex sp.

0 0

1 2

0 1

Indet. Lumbriculidae 1

1 0

0 0

0 Indet.

0 1

0 4

1 3

i y

Hirudinea (Leeches) e Helobdella prob. fusca 1

0 0

0 Helobdella sp.

0 1

0 0

0 2

0 3

Piscicola punctata 0

1 0

0 1

0 0

0 Placobdella sp.

0 0

1 0

0 0

Indet.

0 0

0 1

0 0

ARTHROP0DA Arachnoidea Hydracarina (Water Mites)

Lebertia sp.

0 0

0 1

0 0

l Limnesia sp.

0 0

0 1

0 0

l Crustacea Cladocera (Water Ficas)

Daphnia sp.

0 2

0 1

2 1

2 0

Isopoda (Aquatic Sow Bugs)

Asellus prob. brevicaudus 0

0 0

0 1

0 Asellus militaris 0

0 0

0 2

0 I

Asellus sp.

0 0

1 0

0 1

i

i TABLE 7.1-3 Sample Station Number Collection Method (No. Samples Collected) 2 3

4 5

HT(3) ED(7) HT(2) ED(6) HT(3) ED(7) HT(3) ED(7)

ARTHROPODA (cont'd)

Crustacea Amphipoda (Scuds)

Crangonyx sp.

0 0

1 0

1 1

Gammarus minus 1

0 0

0 Gammarus sp.

0 0

1 0

0 1

Hyalella azteca 1

0 1

0 0

2 Indet. Gammaridae 0

0 0

0 1

0 0

0 Decapoda (Crayfish)

Orconectes limosus 2

0 1

0 2

0 Orconectes sp.

0 0

1 0

0 0

i Indet. Astacidae 0

0 1

0 0

0 is Insecta i

Plecoptera (Stoneflies) 8 Brachyptera sp.

0 0

0 1

0 0

Ephemeroptera (Mayflies)

Baetisca sp.

0 0

1 0

0 0

Caenis sp.

0 1

1 0

0 0

Ephemerella bicolor 0

0 0

1 0

0 Ephemerella sp.

0 1

1 0

0 0

Enhoron sp.

0 0

0 1

Hexagenia sp.

1 0

0 0

1 2

1 4

Stenonema sp.

0 3

1 0

j Tricorythodes sp.

0 2

0 0

Indet. Baetidae 0

0 0

1 0

0 Indet. Heptageniidae 0

0 1

1 0

0 0

0 Indet.

0 1

0 0

Odonata (Dragonflies, Damselflies)

Didymops sp.

0 0

0 1

0 0

Dromogomphus sp.

0 0

0 1

l Enallagma sp.

0 0

1 0

l M

M M

R FR o

ra F7 FR FR FR FR FR FR FR FR F

L__._F 1

F1 F 1 F 1 f

1 F

TABLE 7.1-4 Sample Station Number Collection Method (No. Samples Collected) i 2

3 4

5 HT(3) ED(7) HT(2) ED(6) HT(3)~ED(7_) HT(3) ED(7)

ARTHR 0PODA (cont'd)

Insecta Odonata (Dragonflies, Damselflies)

Gomphus sp.

0 0

1 1

Ischnura sp.

0 0

1 0

2 0

0 0

Neurocordulia sp.

0 0

1 0

0 0

Megaloptera (Alderflies, Dobsonflies, Fishflies) l Chauliodes sp.

0 0

1 0

0 0

Sialis sp.

2 0

0 1

1 0

2 1

Neuroptera (Spongilla Flies) i Climacia sp.

1 1

0 0

E Trichoptera (Caddis Flies)

Agraylea sp.

0 0

1 0

0 0

i Athripsodes sp.

0 2

0 0

Cheumatopsyche sp.

2 7

3 5

2 0

1 1

Hydropsyche sp.

0 4

1 4

0 0

I Lepidostoma sp.

0 1

0 0

Leptocella sp.

0 0

0 2

0 1

l 1

Leptocerus americanus 1

0 0

0 Macronemum sp.

0 2

0 3

0 0

Mystacides sp.

0 0

1 0

0 0

I Neureclipsis sp.

2 1

0 0

2 0

1 3

Decetis sp.

0 0

0 1

1 1

0 4

Polycentropus sp.

0 0

1 0

i Ps9chomyia sp.

0 0

1 0

0 1

1 Ptilostomis sp.

0 0

0 1

0 0

Triaenodes sp.

0 0

1 0

0 0

Indet. Hydropsychidae 0

3 0

0 0

0 Indet. Leptoceridae 0

0 0

0 1

3 0

2 Indet.

1 1

0 1

0 0

0 1

Coleoptera (Beetles)

Cy11oepus sp.

0 0

1 0

0 0

Dubiraphia sp.

0 0

0 2

0 1

i s

TABLE 7.1-5 Sample Station N. umber Co_llection Method (No. Samples Collected) 2 3

4 5

ARTHROPODA (cont'd)

Insecta Coleoptera (Beetles)

Rhizelmis sp.

0 0

0 1

Stenelmis sp.

0 0

0 1

0 0

Diptera (Flies, Mosquitoes, Midges)

Ceratopogonidae (Biting Midges)

Palpomyia tibialis 0

0 0

0 1

0 0

1 Palpomyia sp.

0 0

0 1

1 2

0 1

ChTronomidae (Midges)

Ablabesniyia mallochi 1

0 0

1 4

Ablabesmyia parajanta 0

0 0

0 1

0 g

Ablabesmyia sp.

0 0

1 0

1 1

i Chironomus sp.

0 0

1 2

0 4

Cladotanytarsus sp.

0 0

1 1

1 0

0 0

Cricotopus_ tremulus group 0

1 1

0 1

0 0

0 Cricotopus sp.

0 1

0 0

Cryptochironomus sp.

1 0

0 0

2 6

1 7

Dicrotendipes neomodestus 1

1 1

0 2

0 1

0 UilErotendipes nervosus 0

1 0

0 0

0 Dicrotendipes sp.

0 0

0 1

2 0

0 1

Endochironomus nigricans 0

0 0

1 Endochironomus subtendens 0

0 0

0 1

0 Eukiefferiella discoloripes group 0

0 1

0 0

0 Glyptotendipes spp.

2 1

1 2

3 0

3 3

Harnischia sp.

0 0

2 1

0 2

Heterotrissocladius sp.

0 0

0 1

0 0

.Monodiamesa sp.

0 0

0 1

0 3

0 4

Nanocladius sp.

0 0

0 1

0 0

Nilothauma sp.

0 0

1 0

1 1

Parachironomus abortivus 1

0 0

1 1

0 1

0 Parachironomus frequens 0

1 0

0 0

0 Parachironomus sp.

0 1

0 0

4

-- q 7-TABLE 7.1-6 Sample Station Number Collection Method (N_o. Samples Collected) 2 3

4 5

HT(3) ED(7)_ HT(2) ED(6) HT(3) ED(7) HT(3) ED(7)

{

ARTHROP0DA (cont'd)

Insecta Diptera Chironomidae (Midges)

Paratanytarsus sp.

0 0

0 1

0 0

1 0

Pentaneura sp.

0 0

0 1

Phaenopsectra sp.

0 0

0 1

0 0

Polypedilum nr. scalaenum 0

0 0

1 Polypedilum sp.

I 1

1 2

2 1

1 3

Potthastia_sp.

0 0

0 1

Procladius sp.

0 0

1 5

1 4

4 Pseudochironomus sp.

0 0

0 1

0 0

g Rheotanytarsus exiguus group 0

1 1

1 0

0 1

0 i

Rhectanytarsus sp.

2 1

1 1

1 0

0 0

Stictochironomus sp.

0 0

0 1

i Sympotthastia sp.

0 1

0 0

1 Tanytarsus sp.

0 0

1 1

0 0

i Thienemannimyia group 1

2 0

0 1

1 1

0 l

Tribelos sp.

2 0

0 0

2 3

0 4

Xenochironomus xenolabis 1

0 0

1 0

0 1

0 Xenochironomus sp.

0 1

0 0

Indet. Chironominae 0

1 0

1 1

2 0

1 Indet. Tanypodinae 0

0 0

0 1

0 0

0 Indet. Tanytarsini 0

0 0

1 0

0 0

1 Indet.

0 2

1 2

0 3

0 2

Culicidae (Mosquitoes, Phantom Midges) 1 Chaoborus sp.

0 0

0 1

Indet.

0 0

0 1

Muscidae (Anthomyiids)

Indet.

0 1

0 0

Rhagionidae (Snipe Flies)

Atherix variegata 0

0 1

0 0

0

TABLE 7.1-7

_S_ ample Station Number Collection Method (No. Samples Collected) 2 3

4 5

ARTHROP0DA (cont'd)

Insecta Diptera Simuliidae (Black Flies)

Simulium sp.

0 0

0 1

0 0

Indet.

0 0

0 1

0 0

MOLLUSCA Gastropoda (Snails, Limpets)

Amnicola sp.

0 5

2 3

0 0

1 0

Aplexa hypnorum 0

1 0

0 0

0 4

Ferrissia sp.

0 0

0 2

0 0

Gyraulus sp.

0 0

1 0

oni' Helisoma sp.

0 6

0 2

0 0

Physa sp.

0 1

0 0

Pelecypoda (Clams, Mussels)

Elliptio pro 5. arctata 0

1 0

0 0

1 0

0 Elliptio sp.

I 1

0 0

1 1

0 2

Musculium sp.

I 1

0 2

0 0

Pisidium sp.

0 3

0 1

0 6

0 5

Sphaerium sp.

0 6

0 3

0 4

0 3

Indet.

0 0

0 2

0 1

~

1 r

u

?

L I

L SECTION 8 y

L u

FISH STUDIES E

E E

E M

W M

M L-

I I

f 8.

FISH STUDIES l

8.1 Fish Impingement Studies During all five phases of the special open cycle testing I

conducted in the years 1974-1978, fish impinged on Vermont Yankee's

)

traveling screens at the intake structure were collected each day and identified, counted, weighed, and measured.

The results of these studies, summarized in the Phase V report ( Aquatec 1979),

provided the basis for the schedule of impingement studies, set forth in Vermont Yankee's current NPDES permit, to be conducted during open cycle operation.

This schedule requires a 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months sample 3 times per week in October and the period April 16 through May 15, one time a week in November and from March 1 through April 15, and one 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months sample per month in December, January, and February.

Impingement studies during Vermont Yankee's 1981 open l

cycle operation were conducted in accordance with this schedule.

Impingement studies were not conducted in the years 1974-78 during times when Vermont Yankee used the closed cycle mode of con-denser cooling.

At such times, the rate at which service water from the river is taken into the plant is less than 3% of the rate of use for condenser cooling during open cycle operation.

It seemed unlikely that significant impingement of fish on the service water traveling screens would occur during closed cycle operation.

Some members of the Vermont Yankee Advisory Committee expressed concern, however,.that there might be an impact on shad recently I

restored to the Connecticut River, so Vermont Yankee agreed to continue sampling three times a week into the summer months.

A summary of the weight extremes and the extremes in total length of the fish species observed in the impingement studies in 1981, during both open and closed cycle operation, is given in I

-157-

TABLE 8.1

SUMMARY

OF WEIGHT AND TOTAL LENGTH EXTREMES OF FISH SPECIES COLLECTED IN 1981 IMPINGEMENT STUDIES Total Species Weight (g)

Length (mm)

Osmerus mordax (Mitcht11)

Rainbow smelt 24-32 165-182 Catostomus commersoni (Lac 6pede)

White sucker 7.1-17 92-116 Notemigonus crysoleucas (Mitchill)

Golden shiner 2.0-33 70-14L Notropis hudsonius (Clinton)

Spottail shiner 1.7-15 55-124 Hybognathus nuchalis Agassiz Silvery minnow 2.8-12 70-101 Ictalurus nebulosus (LeSueur)

Brown bullhead 5.9-67 76-175 Ictalurus natalis (LeSueur)

Yellow bullhead 60-80 165-170 Morone americana (Gmelin)

White perch 3.7-238 70-245 Perca flavescens (Mitchill)

Yellow perch 3.6-91 76-198 Etheostoma olmstedi Storer Tessellated darter 2.6-5.5 57-76 Micropterus dolomieui Lace,pEde Smallmouth bass 4.0-344 71-310 Micropterus salmoides (Lac 6pede)

Largemouth bass 16 110 Lepomis gibbosus (Linnaeus)

Pumpkinseed 1.5-91 46-157 Lepomis macrochirus Rafinesque Bluegill 1.7-62 42-145 Juvenile Lepomis spp.

1.0-2.0 44-50 Ambloplites rupestris (Rafinesque)

Rock bass 0.6-271 34-225 I

l l

-158-

Table 8.1.

In Table 8.2, the numbers and total weight in grams of each impinged species are shown for each of the months of open cycle operation.

In Table 8.3, these data are given for the impingement studies done during closed cycle operation of Vermont Yankee.

In both Table 8.2 and 8.3, the fish species are listed in order of the decreasing number of the species collected.

FL Table 8.2 shows for each month and for the total period of open cycle studies the mean number and mean weight of fish per test

~

day in 1981.

At the bottom of the table are listed the daily means and standard deviations, for both number and weight of fish impinged, that were observed for comparable periods in the five phases of the

~

open cycle test program conducted in the years 1974-78.

The mean weight per test day in all months of 1981 open cycle

-~

operation were within two standard deviations of the Phases I-V daily means for the corresponding month.

Only the 8 fish impinged in February 1981 exceeds the mean number plus two standard devia-tions of the corresponding months of the years 1974-78.

Both the mean number and mean weight for all the test days of 1981 were less than the daily means plus one standard deviation for the same j

months during the Phases I-V studies.

No earlier statistics on impingement rates during closed cycle operation are available for comparison with the data of 1981, but the mean numbers and weight of fish impinged per day, shown in Table 8.3, are very low.

For the 63 test days, the average number of fish impinged was 0.40, the average weight was 6.5 grams (0.23 ounces).

8.2 Resident Finfish Studies A total of 3359 fish were collected in 1981 at Vermont Yankee Sample Stations 2, 3, 4, 5, and 8.

The locations of these stations are shown in Figure 8.1.

The fish were taken in 147 collections

'g by three capture, methods - trap net, gill net, and seine haul.

A 3

summary by station and capture method of the fishing effort made and the numbers and weight of fish collected is shown in Table 8.4.

I 1

g

-159-L

TABLE 3.2

SUMMARY

BY MONTH OF NUMBER AND WEIGHT OF FISH SPECIES COLLECTED IN IMPINGEMENT STUDIES DURING 1981 OPEN CYCLE OPERATION JAN FEB MAR APR MAY OCT DEC TOTAL Species No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g)

Yellow perch 6-58.6 157-1316.5 113-1118.2 3-15.9 279-2509.2 Rock bass25-534.9 103-643.2 48-273.0 3-10.4 179-1461.5 White perch 2-11.4 30-212.6 57-580.2 7-293.3 96-1097.5 Pumpkinseed 1-44.0 4-17.4 5-116.4 27-250.9 5-98.1 15-50.3 57-577.1 Spottail shiner 5-30.0 22-126.6 11-66.0 38-222.6 Smallmouth bass 5-546.5 6-35.6 9-59.1 1-9.8 1-5.5 22-656.5 h

Golden shiner 5-19.0 10-79.5 3-14.9 18-113.4 8

Silvery minnow 1-3.6 11-46.9 6-35.5 18-86.0 Bluegill 1-4.0 8-160.1 3-9.0 12-173.1 Juvenile Lepomis spp.

2-3.9 2-2.3 6-8.7 2-3.6 12-18.5 Brown bullhead 4-36.5 4-25.9 8-62.4 White sucker 1-7.1 3-41.3 4-48.4 Rainbow smelt 2-56.0 2-56.0 Tessellated darter 2-8.1 2-8.1 Yellow bullhead 1-80.0 1-80.0 Largemouth bass 1-16.0 1-16.0 OTALS ~~~~~~~~~

1-44.0

~5~32.7 86-1535.0 417-3444.8 205 Td23.5 I7 99.Y

~.1-5.5 1 745-7186.5

~

7

~~

Number of test days 1

1 4

9 6

3 1

25 Daily means 1.0-44.0 8.0-32.7 21.5-383.8 46.3-382.8 34.8-337.6 9.0-33.0 1.0-5.5 30.0-287.5 Phases I-V Daily means 1.0-66.3 1.2-15.3 23.6-248.0 71.9-692.3 8.9-113.5 83.2-662.2 2.3-46.0 25.8-257.4 Standard Dev.

1.6-432.9 1.9-42.0 112.4-710.1 102.8-959.0 10.1-215.7 148.8-1019.3 5.7-109.6 83.2-665.6

_ _ _ = ~

TABLE 8.3

SUMMARY

BY MONTH OF NUMBER AND WEIGHT OF FISH SPECIES COLLECTED IN IMPINGEMENT STUDIES DURING 1981 CLOSED CYCLE OPERATION MAY JUN JUL AUG SEP OCT TOTAL Species No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g) No.-Wgt.(g)

Bluegill 6-21.0 6-21.0 h

Smallmouth bass 2-120.0 2-19.0 4-139.0 7

Juvenile Lepomis spp.

3-3.7 l-1.6 4-5.3 Brown bullhead 3-88.0 3-88.0 Rock bass 1-14.0 1-5.6 1-37.0 3-56.6 Yellow perch 1-8.5 1-18.0 2-26.5 Yellow bullhead 1-60.0 1-60.0 Pumpkinseed 1-8,4 1-8.4 Spottail shiner 1-6.0 1-6.0

_ -..25-410.8 TOTALS 7-274.0 1-14.0 1-5.6 3 3.7_

__3-l_8 5_

10-95.0 No. of test days 6

12 15 12 12 6

63 Daily means 1.2-45.7 0.08-1.2 0.07-0.37 0.25-0.31 0.25-1.5 1.7_ _15.8____ _ _-6.5 0.40 l

l l

l

N FI S H SAMPLE STATIONS

\\

y o

l 0

1/2 e

t CHESTERFIELD SCALE IN MILES pfTREAT MEADOWS l----_______,____

E BRATTLEBORO 7

______7__

I c '

o GUILFORD NEW HAMPSHIRE E

1 0*

5

/

\\

$c/*'

5 n

h

" 'g 4

HINSDALE I

VERNON S

I

8ge, a

l portor g

l l

I VERMONT Nh 10 + C p s

VERMONT

\\s g

I

=-=i

==

l MASSACHUSETTS FIGURE 8.1

-162-

M M

M TABLE 8.4

SUMMARY

OF FISHING EFFORT AND RESULTS 1981 CAPTURE METHOD TRAP NET GILL NET SEINE HAUL TOTALS No.

No.

SAMPLE No. Weight Net Set No. Weight Net Set No. Weight No.

No. Weight LOCATION Fish (g)

Sets Hours Fish (g)

Hauls Fish (g)

South of Vernon Dam Station 2 60 9346 11 249 85 42040 7

168 0

0 0

145 51386 Station 3 449 113753 25 582 32 14033 7

168 62 72 1

543 127858

,r C

Totals - South of 8

Vernon Dam 509 123099 36 831 117 56073 14 336 62 72 1

688 179244 North of Vernon Dam Station 4 452 97622 29 754 126 28029 13 293 582 1390 3

1160 127041 Station 5 1128 299941 23 569 83 56508 15 379 245 902 2

1456 357351 Station 8 55 10472 12 286 0

0 0

55 10472 Totals - North of Vernon Dam 1635 408035 64 1609 209 34537 28 672 827 2292 5

2671 494864 Totals - All Locations 2144 531134 100 2440 326 140610 42 1008 889 2364 6

3359 674108

I The collected fish were identified and their weight and total length were measured and recorded.

Of the 21 species observed in the 1981 collections, 15 were captured at locations both upstream and downstream of Vernon Dam.

Two species - fallfish and chain pickerel - were found only in the collections south of Vernon Dam; four species - Atlantic salmon, carp, silvery minnow, and tessellated darter - were observed only in collections north of the dam.

Only one specimen of Atlantic salmon has been collected in previous Vermont Yankee studies.

It was captured on 7 June 1975 in a trap net at Station 8.

The 1981 collection was made on 17 June in a trap net set about 0.2 miles north of Vernon Dam, off the New Hampshire shore.

American shad have been stocked in the Vernon pool for several years and adult shad have been observed near the Vernon Dam.

How-ever, no shad had been taken in Vermont Yankee fish studies until 1981.

Twenty five juvenile shad were collected in 1981, 24 in seine hauls on 18 August along the Vermont shore of Stations 4 and 5, upstream of Vernon Dam, and one on 19 August in a trap net set 0.1 mile south of Vernon Dam along the Vermont shore.

The data of the 1981 fish collections are summarized by species in Tables 8.5, 8.6, and 8.7.

Table 8.5 shows for all collections in 1981 the number, the total weight, and the extremes in weight and total length observed for each species.

Table 8.6 summarizes - by sample station, capture method, and number of collections in which the species was taken - the numbers and total weights of the species captured north of Vernon Dam.

Table 8.7 summarizes these data for the fish collected south of Vernon Dam.

Frequency distributions by total length for nine species are shown in Table 8.8.

The species compositions, by weight and by number, of the 1981 collections are graphed in Figures 8.2 and 8.3.

These compositions are reduced to a percentage basis and shown in Figures 8.4 and 8.5, along with percentage compositions of earlier surveys to permit comparison with previous studies.

-164-

TABLE 8.5 FISHES OF THE CONNECTICUT RIVER IN THE VICINITY OF VERNON, VERMONT I

ALL COLLECTIONS 1981 I

Total Total Weight Length Number Weight Extremes Extremes In Species Captured In Grams In Grams Millimeters Alesa sapidissima (Wilson)

American shad 25 66 1.7-7.0 55-78 Salmo salar Linnaeus Atlantic sa; mon 1

195 195 313 Catostomus commersoni (Lacepede)

White Sucker 286 224756 12-1700 122-525 Cyprinus carpio Linnaeus Carp 16 65324 95-6463 178-715 I

Semotilus corporalis (Mitchill)

Fallfish 2

716 216-500 266-331 Notemigonus crysoleucas (Mitchill)

Golden shiner 31 1496 0.5-169 45-230 I

Notropis hudsonius (Clinton)

Spottail shiner 209 1143 0.4-18 37-122 Hybognathus nuchalis Agassiz Silvery minnow 64 174 1.9-15 57-110 Ictalurus nebulosus (LeSueur)

Brown bullhead 9

3581 102-668 206-377 Esox niger LeSueur Chain pickerel 3

1007 180-582 322-460 Anguilla rostrata (LeSueur)

American eel 13 7296 204-1202 290-900 Fundulus diaphanus (LeSueur)

Banded killifish 77 88 1.1-1.9 30-53 Morone americana (Gmelin)

White perch 824 153559 5-555 83-330 Perca flavescens (Mitchill)

Yellow perch 591 43802 1-356 75-298 Stizostedion vitreum (Mitchill)

Walleye 43 30414 100-2069 225-620 Etheostoma olmstedi Storer Tessellated darter 13 14 0.6-1.5 37-53 Micropterus dolomieui Lac 6p6de l

Smallmouth bass 324 83973 2-1300 59-454 Micropterus salmoides (Lac 6pede)

Largemouth bass 25 5605 3.5-1728 58-485 Lepomis gibbosus (Linnaeus)

Pumpkinseed 166 11585 1.0-267 56-212 Lepomis macrochirus Rafinesque Bluegill 58 3526 4-310 66-245 l

Juvenille Lepomis spp.

267 401 0.3-2.8 25-50 l

Ambloplites rupestris (Rafinesque)

Rock bass 312 35387 0.6-41 5 30-258 TOTALS 3359 674108

-165-

l TABLE 8.6-1 FISHES OF THE CONNECTICUT RIVER IN THE VICINITY OF VERNON, VERMONT ALL COLLECTIONS NORTH OF VERNON DAM 1981 I

Station Capture No. of No.

Weight Species Totals Species No.

Method Coll.

Fish Grams No.

Weight American shad 4

Seine 1

1 2

5 Seine 1

23 57 24 59 a,tLintic salmon 4

Trap net 1

1 195 1

195 White sucker 4

Trap net 16 39 30353 Gill net 5

13 9504 5

Trap net 18 92 70181 Gill net 5

8 6462 8

Trap net 1

1 904 153 117404 Carp 5

Trap net 6

7 24518 Gill net 1

9 40806 16 65324 Golden shiner 4

Trap net 1

1 53 Seine 2

12 21 5

Trap net 4

10 768 Gill net 1

2 211 Seine 1

1 2

26 1055 Spottail shiner 4

Trap net 4

75 928 Seine 3

124 176 E

5 Trap net 1

1 9

3 Seine 1

6 11 206 1124 Silvery minnow 4

Seine 2

63 159 3

5 Trap net 1

1 15 64 174 E

Brown bullhead 5

Trap net 2

2 719 2

719 American eel 5

Trap net 3

10 6532 10 6532 Banded killifish 4

Seine 1

11 11 5

Seine 1

5 9

16 20 White perch 4

Trap net 21 154 25061 Gill net 8

60 8140 Seine 1

69 338 5

Trap net 18 465 106515 Gill net 4

27 4404 8

Trap net 2

3 605 778 145063 Yellow perch 4

Trap net 10 48 352 Gill net 8

35 3808 Seine 2

13 61 5

Trap net 17 262 24504 Gill net 5

31 3440 Seine 1

124 582 8

Trap net 5

8 1316 521 37074

-166-

TABLE 8.6-2 FISHES OF THE CONNECTICUT RIVER I

IN THE VICINITY OF VERNON, VERMONT ALL COLLECTIONS NORTH OF VERNON DAM 1981 I

I Station Capture No. of No.

Weight Species Totals Species No.

Method Coll.

Fish Grams No.

Weight Walleye 4

Trap net 13 20 17148 I

Gill net 4

7 3542 5

Trap net 7

10 7988 s

Trap net 1

1 413 38 29091 I

Tessellated darter 4

Seine 2

3 3

5 Seine 1

10 11 13 14 Smallmouth bass 4

Trap net 12 48 14155 Gill net 4

11 3035 Seine 1

5 103 5

Trap net 18 85 31012 I

Gill net 2

2 674 Seine 1

3 14 8

Trap net 6

25 5753 179 54746 I

Largemouth bass 4

Seine 2

5 49 5

Trap net 5

7 5412 Seine 1

9 57 21 5518 I

Pumpkinseed 4

Trap net 11 21 2806 Seine 2

27 86 5

Trap net 9

61 6009 Gill net 1

2 240 I

Seine 1

15 51 8

Trap net 1

1 17 127 9209 I

Bluegill 4

Trap net 3

8 1629 Seine 2

23 69 5

Seine 1

13 38 44 1736 I

Juvenile Lepomis spp.

4 Seine 4

224 31 0 5

Seine 1

36 70 260 380 I

Rock bass 4

Trap net 8

37 1931 Seine 1

2 2

5 Trap net 15 115 15759 Gill net 2

2 271 I

8 Trap net 5

16 1464 172 19427 TOTALS NORTH OF VERNON DAM 2671 494864 I

I

I' TABLE 8.7-1 FISHES OF THE CONNECTICUT RIVER IN THE VICINITY OF VERNON, VERMONT ALL COLLECTIONS SOUTH OF VERNON DAM 1981 Station Capture No. of No.

Weight Species Totals Species No.

Method Coll.

Fish Grams No.

Weight American shad 3

Trap net 1

1 7

White sucker 2

Trap net 1

3 2478 Gill net 7

37 32470 3

Trap net 21 83 63062 l

Gill net 2

10 9342 133 107352 g

l 3

Fa11 fish 2

Gill net 2

2 716 2

716 Golden shiner 3

Trap net 2

3 176 Gill net 1

2 265 5

441 Spottail shiner 3

Trap net 1

3 19 3

19 Brown bullhead 3

Trap net 6

7 2862 7

2862 Chain pickerel 2

Gill net 1

1 180 3

Trap net 1

1 245 Gil.1 net 1

1 582 3

1007 American eel 2

Trap net 1

1 350 3

Trap net 2

2 414 3

764 Banded killifish 3

Seine 1

61 68 61 68 White perch 2

Trap net 4

11 1469 Gill net 6

13 3055 3

Trap net 9

22 3972 46 8496 Yellow perch 2

Trap net 1

1 140 Gill net 6

15 3239 3

Trap net 8

50 2369 Gill net 2

4 980 70 6728

-168-

i I

TABLE 8.7-2 FISHES OF THE CONNECTICUT RIVER IN THE VICINITY OF VERNON, VERMONT I

ALL COLLECTIONS SOUTH 0F VERNON DAM 1981 I

Station Capture No. of No.

Weight Species Totals Species No.

Method Coll.

Fish Grams No.

Weight Walleye 2

Trap net 1

1 274 Gill net 2

2 294 I

3 Trap net 2

2 755 5

1323 Smallmouth bass 2

Trap net 6

10 1256 I

Gill net 5

11 1632 3

Trap net 22 118 24765 Gill net 2

6 1574 145 29227 Largemouth bass 3

Trap net 2

3 83 Seine 1

1 4

4 87 Pumpkinseed 2

Trap net 1

1 53 Gill net 1

1 117 3

Trap net 11 35 2048 Gill net 1

2 158 39 2376 Bluegill 2

Trap net 1

1 199 Gill net 1

1 130 I

3 Trap net 6

12 1461 14 1790 Juvenile Lepomis spp.

3 Trap net 1

7 21 7

21 l

Rock bass 2

Trap net 7

31 3127 Gill net 2

2 207 I

3 Trap net 20 100 11494 Gill net 2

7 1132 140 15960 TOTALS SOUTH OF VERN0N DAM 688 179244 I

I

-169-

TABLE 8.8-1 FREQUENCY DISTRIBUTION OF FISH SPECIES BY TOTAL LENGTH 1981 Total SMALLMOUTH Length WHITE PERCH YELLOW PERCH BASS PUMPKINSEED BLUEGILL ROCK BASS (mm)

No.

Wgt.(g)

No.

Wgt.(g)

No.

Wgt.(g)

No.

Wgt.(g)

No.

Wgt.(g)

No.

Wgt.(g) 0-20 21-40 2

2 41-60 1

3 2

9 4

7 61-80 3

15 4

19 2

10 2

15 81-100 10 68 21 126 13 99 4

66 2

38 101-120 2

33 21 257 5

93 7

241 2

66 35 968 121-140 1

26 16 428 2

49 12 660 25 1114 141-160 9

553 43 1551 17 750 22 2148 50 3873 H

161-180 60 4291 23 1146 22 1415 24 3024 7

59 6316 181-200 61 5625 45 3585 14 1334 12 2083 4

714 60 8646

~

201-220 63 9056 64 7298 48 6064 3

741 5

1057 30 5780 221-240 108 20466 38 5289 48 8034 1

290 12 3091 241-260 116 28484 23 4130 24 4944 1

31 0 4

1412 261-280 47 14260 20 5135 24 6209 281-300 25 9275 4

1210 37 11923 301-320 2

960 13 5238 321-340 1

555 12 5680 341-360 7

4209 361-380 10 6861 381-400 10 7517 401-420 6

5382 421-440 5

5643 441-460 2

_507 461-480 481-500 TOTALS 505 93652 321 30170 324 83973 86 8972 22 3419 285 31262 M

M M

lI 1I TABLE 8.8-2 FREQUENCY DISTRIBUTION OF FISH SPECIES BY TOTAL LENGTH 1981 Total Length WHITE SUCKER CARP WALLEYE (m)

No.

Wgt.(g)

No.

Wgt.(g)

No.

Wgt.(g) 0-20 21-40 41-60 I

61-80 81-100 101-120 I

121-140 1

12 141-160 161-180 1

56 1

95 181-200 I

201-220 3

304 221-240 2

291 2

215 241-260 I

261-280 2

349 281-300 3

834 2

426 301-320 1

327 321-340 13 5697 2

565 I

341-360 22 11156 361-380 30 17633 2

1010 381-400 28 19951 4

1925 I

401-420 49 38595 6

3501 421-440 43 37677 6

4044 441-460 35 36315 1

1293 6

4272 I

461-480 24 25581 3

2738 481-500 12 14332 4

4159 501-520 2

2561 521-540 1

1522 1

1345 I

541-560 561-580 581-600 1

3854 1

1813 I

601-620 1

3856 2

4052 621-640 5

21538 641-660 I

661-680 4

18024

~681-700 l 2

10201 701-720 1

6463 TOTALS 270 212844 16 65324 43 30414 I

I

-=-

i

GRAMS LBS. g igx >o)

RESIDENT FISH SPECIES

~

22o -y COMPOSITION BY WEIGHT 4so - zoo -

40o _ iso _f B

m$_as 5

se s

?!

3

!s G!

se os 50 2:

re 58 FIGURE 8.2 I

1000 9* -

RESIDENT FISH SPECIES I

COMPOSITION BY NUMBER 19 81 SURVEY E

52 -

hBhBe gg I

a is e,

=

I

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$2 5

ON h

k Es 35 is H

ss 3

H FIGURE 8.3 I

-173-

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~~CC CC I~~

~~C MA P F MD L~~

~~A R A S n)_c E rnn c-l l1l~~

~~l l~~

~~l With two exceptions the percentages by weight in the 1981 study were within ranges that had been observed in earlier surveys.~~

~~l The percentage by weight of carp in the 198] survey (9.7%) was smaller than the previous minimum of 15.5% in 1976.~~

~~The 1981 l~~

~~percentage by weight of indigenous cyprinids (0.5%) was smaller also than the prior minimum of 0.6%, observed in the 1978 survey.~~

~~The numbers of both yellow perch and rock bass in the 1981 survey were greater percentages of the year's total catch than in l~~

~~prior years.~~

~~The 17.6% by number of yellow perch exceeded the 15.6% by number of the 1969-70 survey, and the 9.3% by number of l~~

~~rock bass was greater than the earlier maximum of 7.3% in 1974.~~

~~Scale samples far age determination were taken from all white perch, yellow perch, walleye, and smallmouth bass collected in 1981 that had a total length of more than 50 mm.~~

~~The.results of the reading of these scales, along with the age-growth data collected in years prior to Vermont Yankee's operation with open cycle cooling, are shown in Tables 8.9 through 8.12.~~

~~The data on number of annuli and mean total length from these tables are shown graphically in Figures 8.6 through 8.9.~~

~~For white perch, the age-growth data of 19C1 are not signif-icantly different from that of the years 1969-73.~~

~~For yellow perch, too, the age-growth curve of the specimens collected north of Vernon Dam is not greatly different from that of the years 1969-73.~~

~~How-ever, the age-growth data for the yellow perch taken south of the dam show an enhanced growth rate relative to that of the 1969-73 survey.~~

~~An increase in growth rate is also evidenced in the 1981 data for walleye and smallmouth bass, both north and south of Vernon Dam.~~

~~The walleye age-growth data for the previcus four years have also shown an increased rate of growth relative. to the years before Vermont Yankee began open cycle operation.~~

~~The discharge of heat to the river by Vermont Yankee and the unusually warm ambient river~~

(

~~temperatures in the early months of 1981 (Section 3 of this report) are probably contributing factors to this apparent increase in rate of growth of these fish species.~~

~~-177-~~

~~I l~~

~~TABLE 8.9 AGE-GROWTH DATA - WHITE PERCH ALL COLLECTIONS Number 19~69 - 1973 1781 of Number Total Length (mm)~~

~~Number Total Length (Imn)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes 0~~

~~47 91 62-130 12 95 83-109 1~~

~~8 178 169-194 76 177 150-198 2~~

~~94 202 155-245 144 214 163-259 3~~

~~253 231 175-276 91 225 156-270 4~~

~~112 244 204-303 58 248 180-286 5~~

~~18 267 239-311 59 266 233-288 6~~

~~5 284 270-308 42 267 245-312 7~~

~~0 5~~

~~296 265-330 COLLECTIONS NORTH OF VERNON DAM Number 1969 - 1973 1981~~

=

~~of Number Total Length (mm)~~

~~Number Total Length (mm)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes~~

?

~~O 43 90 62-130 12 95 83-109 1~~

~~7 176 169-180 74 177 150-198 2~~

~~64 198 155-235 122 215 164-255 3~~

~~118 224 175-276 81 224 156-270 4~~

~~48 239 204-285 54 250 227-286 5~~

~~12 269 247-311 55 268 240-288 6~~

~~4 278 270-296 38 266 245-312 5~~

~~296.~~

~~265-330 7~~

~~0 I~~

~~COLLECTIONS SOUTH OF VERNON DAM Number 1969 - 1973 1981 of Number Total Length (mm)~~

~~Number Total Length (mm)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes 0~~

~~4 92 68-110 0~~

~~1 1~~

~~194 2~~

~~192 188-195 2~~

~~30 210 178-245 22 210 163-259 3~~

~~135 235 186-270 10 232 165-260 4~~

~~64 247 213-303 4~~

~~223 180-262 5~~

~~6 263 239-285 4~~

~~240 233-252 6~~

~~1 308 4~~

~~282 275-290 7~~

~~0 0~~

~~4 I~~

~~-178-~~

~

~~AGE-GROWTH GRAPHS - WHITE PERCH I~~

~~mm.~~

~~in.~~

~~1 350 -~~

~~- 13~~

~~- 12 300 -~~

~~I e,~~

~~,-[~~

~~250 -- 10 I~~

-9

~~..-/~~

~~I 200 --8~~

~~,e e a~~

I

~~-7 w~~

~~_s 15 0 --6~~

~~-5 10 0 --4 1969-1973~~

~~_3 50 --2 19 81~~

~~-1 O~~

~~O O~~

~~I 2~~

~~3 4~~

~~5 6~~

~~7 I~~

~~NUMBER OF ANNULI NORTH AND SOUTH OF VERNON DAM m m.~~

~~in.~~

~~m m.~~

~~in.~~

~~350 -~~

~~- 13~~

~~- 12~~

~~- 12 300 -~~

~~300 -~~

~~- 11 f.,,'~~

~~- ll 250 -- 10 250 -- 10~~

,/

~~-p 6~~

~~./. c' l~~

~~r 200 --8 e',~~

~~200 --8 g~~

e/

g

~7

~~-7 U 150 --6 15 0 --6~~

-5

~~-5 10 0 --4 10 0 --4~~

-3

~~-3 50 --2 50 --2 I~~

-1

~~-1 0~~

~~0 o~~

~~O o~~

~~i 2~~

~~3 4~~

~~5 6~~

~~7 0~~

~~1 2~~

~~3 4~~

~~5 6~~

~~7 NUMBER OF ANNULl NUMBER OF ANNULI NORTH OF VERNON DAM SOUTH,OF VERNON DAM I~~

~~FIGURE 8.6~~

~~-179-~~

~~TABLE 8.10 AGE-GROWTH DATA - YELLOW PERCH ALL COLLECTIONS Number 1969 - 1973 1981 of Number Total Length (mm)~~

~~Number Total Length (mm)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes 0~~

~~45 81 45-118 44 102 80-123 1~~

~~44 122 67-183 T7 152 100-190 2~~

~~80 192 156-235 96 198 133-245 3~~

~~71 216 158-249 72 224 185-278 4~~

~~74 234 208-266 25 241 220-287 5~~

~~50 251 217-280 9~~

~~262 242-283 6~~

~~23 270 225-295 3~~

~~260 244-270 7~~

~~9 281 265-302 3~~

~~275 255-298 lE 0~~

~~8 2~~

~~285 9~~

~~0 0~~

~~10 1~~

~~305 0~~

~~COLLECTIONS NORTH OF VERNON DAM Number 1969 - 1973 1981 of Number Total Length (Imn)~~

~~Number Total Length (sn)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes E~~

~~O 22 83 45-118 6~~

~~91 80-98 5~~

~~1 30 126 67-183 52 152 100-190 2~~

~~73 190 156-235 90 198 133-245 g~~

~~3 49 218 170-249 60 219 185-266 3~~

~~4 37 232 208-266 18 235 220-277 5~~

~~22 251 217-271 7~~

~~261 242-283 6~~

~~4 271 261-282 2~~

~~255 244-266 7~~

~~2 269 265-272 2'~~

~~263 255-270 8~~

~~2 285 0~~

~~0 l~~

~~9 0~~

~~E 10 1~~

~~305 0~~

~~COLLECTIONS SOUTH OF VERNON DAM Number 1969 - 1973 1981 of Number Total Length (mm)~~

~~Number Total Length (mm)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes 0~~

~~23 80 47-101 38 104 81-123 1~~

~~14 115 101-156 5~~

~~154 137-185 2~~

~~7 209 174-230 6~~

~~194 166-217 3~~

~~22 212 158-241 12 249 217-278 4~~

~~37 237 211-262 7~~

~~256 221-287 5~~

~~28 250 230-280 2~~

~~266 265-267 6~~

~~19 270 225-295 1~~

~~270 7~~

~~7 285 267-302 1~~

~~298 8~~

~~0 0~~

~~0 9~~

~~0 10 0~~

0

~~-180-~~

~~AGE-GROWTH GRAPHS - YELLOW PERCH m m.~~

~~in.~~

~~350 -~~

~~- 13 300 -- 12~~

~~- II I-~~

< /*

~

~~250 -_ go~~

~~,,,p.~~

~9

~~<*'/~~

~~l l~~

~~I I 200 --8 e~~

~~(;;~~

-7

/

~~gw i~~

~~J 150 --6~~

,e

~

~~-5 j.~~

~~10 0 --4 1969-1973 L~~

~~50 --2 19 81 EE~~

~~-1 0--O i~~

~~i i~~

~~i I~~

~~O 1~~

~~2 3 4~~

~~5 6 7 8 9 10 NUMBER OF ANNULI NORTH AND SOUTH OF VERNON DAM m m.~~

~~in.~~

~~mm.~~

~~in.~~

~~350 -~~

~~- 13~~

~~- 13 300 -- 12~~

~~- 12 300 -~~

~~.~./~~

~~- 11 y~~

~~- ll~~

. ' .2 250 -- 10

?'

~~250 -- 10~~

~~/ */~~

o

/

,/ /*

-9

~

[

~~r 200 --e 200 --8 w~~

~~,3 2~~

~~-7 l~~

~~-7 15 0 --6~~

,?

~~150 --6 f~~

~~-5 s.~~

~~-5 i~~

~~10 0 --4 10 0 --4 e~~

-3

~~-3 50 -~2 50 --2~~

-1

~~-1 0--O 0~~

~~0 3~~

(

~~0 1~~

~~2 3 4 5 6 7 8 9 10 O I 2 3 4 5 6 7 8 9 10 NUMBER OF ANNULI NUMBER OF ANNULl NORTH OF VERNON DAM SOUTH OF VERNON DAM FIGUR E 8.7~~

~~-181-~~

~~I TABLE 8.11 AGE-GROWTH JATA - WALLEYE I~~

~~ALL COLLECTIONS Number 1969 - 1973 l~~

~~1981 of Number Total Length (mm)~~

~~Number Total Length (mm)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes EE 0~~

~~4 136 119-151 0~~

~~1 6~~

~~188 163-211 8~~

~~274 225-331 2~~

~~13 286 242-337 3~~

~~383 375-390 3~~

~~18 337 275-380 13 429 396-495 4~~

~~22 344 291-381 14 458 390-500 5~~

~~32 375 303-407 2~~

~~407 379-435 6~~

~~8 396 321-435 2~~

~~560 525-595 7~~

~~6 473 425-527 1~~

~~620 8~~

~~0 1~~

~~610 COLLECTIONS NORTH OF VERNON DAM Number 1969 - 1973 1981 of Number Total Length (mm)~~

~~Number Total Length (mm)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes 0~~

~~3 134 119-151 0~~

~~1 5~~

~~190 163-211 4~~

~~282 227-292 2~~

~~6 274 246-320 3~~

~~383 375-390 5~~

~~3 12 331 275-377 12 428 396-495 E~~

~~4 12 344 291-381 14 458 390-500 5~~

~~22 375 337-407 2~~

~~407 379-435 6~~

~~8 396 321-435 2~~

~~560 525-595 7~~

~~4 478 433-527 1~~

~~620 8~~

~~0 1~~

~~610 I~~

~~COLLECTIONS SOUTH OF VERNON DAM Number 1969 - 1973 1981 of Number Total Length (mm)~~

~~Number Total Length (mm)~~

~~Annuli Specimens Average Extremes Specimens Average Extremes 0~~

~~1 141 0~~

~~1 1~~

~~180 4~~

~~266 225-331 2~~

~~7 296 242-337 0~~

~~3 6~~

~~350 318-380 1~~

~~440 4~~

~~10 345 313-360 0~~

~~E 5~~

~~10 373 303-402 0~~

~~0 E~~

~~6 0~~

~~7 2~~

~~463 425-501 0~~

~~0 8~~

0

~~-182-i~~

~~AGE-GROWTH GRAPHS - WALLEYE m m.~~

~~in.~~

~~600 5~~

-n

~~,e' 500 -- 20~~

/

r

~~.,, *s,~~

,/

[.

~~- 18 400 -- 16~~

,e

~~- 34~~

~~/. /.~~

~~I l~~

j

~

~~g 300 _- 12~~

~~.f w~~

J

~~-- 80 200 --8 1969-1975~~

~

~~150 --6 o~~

~~10 0 --4 1981 50 --2 Jg 0--O 5~~

~~4 g~~

~~g g~~

~~g O~~

~~I 2~~

~~3 4~~

~~5 6~~

~~7 8~~

~~'g NUMBER OF AN NUL1~~

~~!5 NORTH AND SOUTH OF VERNON DAM~~

~~I i~~
m m.
mm.
in.
I n.
600 600 l
-- 22 e'
-- 22
/
1 500 -- 20
/
500 -- 20 j
i
- 18
,I
-- 13
~~,/.."~~
~~/'N, Ni 400 -- 16 COO -- 16~~
-- 14 EI
-- 14 e
E 300-- 12 300 -- 12
.i m
_s
-- 10
-- 10 f
e 200 --8 e
200 --8 f
-6
--6 10 0 --4 10 0 --4
-2
--2 I
0--O 0--O O
1 2
3 4
5 6
7 8
0 1
2 3
4 5
6 7
8 NUMBER OF ANNULI NUMBER OF ANNUL 1 g
5 NORTH OF VERNON DAM SOUTH OF VERNON DAM FIGU R E 8.8
-183-
TABLE 8.12 AGE-GROWTH DATA - SMALLMOUTH BASS ALL COLLECTIONS Number 1969 - 1973 1981 of Number Total Length Omm)
Number Total Length (mm)
Annuli Specimens Average Extremes Specimens Average Extremes 0
16 68 45-102 13 90 70-112 1
25 164 108-213 41 159 120-215 2
31 206 161-255 131 225 167-290 E
3 59 239 197-293 60 288 238-342 g
4 50 275 220-315 24 339 295-403 5
36 305 262-350 10 386 362-423 6
16 346 305-376 15 394 360-454 7
4 370 343-406 3
421 395-444 8
1 357 2
439 434-444 9
2 412 398-425 0
E 10 0
0 g
0 11 1
411 COLLECTIONS NORTH OF VERNON DAM Number 1969 - 1973 1981 of Number Total Length (Imn)
Number Total Length (Imn)
Annuli Specimens Average Extremes Specimens Average Extremes 0
5 50 45-57 5
87 70-112 1
21 161 108-213 23 161 135-215 2
29 205 161-255 63 227 167-283 3
44 235 197-293 28 291 238-322 4
23 272 220-315 16 341 295-403 3
5 23 300 262-339 9
389 374-423 3
6 12 339 305-362 13 394 360-454 7
2 386 365-406 3
421 395-444 1
434 8
0 9
1 398 0
10 0
0 11 0
0 COLLECTIONS SOUTH OF VERNON DAM Number 1969 - 1973 1981 of Number Total Length Omm)
Number Total Length Onm)
Annuli Specimens Average Extremes Specimens Average Extremes 0
11 76 51-102 8
92 77-109 1
4 173 150-207 18 157 120-195 2
2 225 211-238 68 223 176-290 3
15 252 232-274 32 286 260-342 4
27 279 245-305 8
334 315-398 5
13 312 290-350 1
362 6
4 346 352-376 2
392 388-395 g
l 7
2 354 343-364 0
8 1
357 1
444 0
9 1
425 0
10 0
11 1
411 0
-184-
AGE-GROWTH GRAPHS - SM ALLMOUTH B ASS b
m m m.
450 -
400 -- 16
~
/
350 -- 14 1
/
300'-- 12 I
t/,/
[ 250 -- 10 I
200--8
/*
~
e 150 --6 i
100 -
4
/
1969-1973 19 81 50 --2 O
O g
g i
g g
g g
i O I 2 3 4 5 6 7 8 9 10 ll NUMBER OF ANNULI I
NORTH AND SOUTH OF VERNON DAM in.
mm.
in.
I mm.
450 -
450 -
i 400 -- 16 4oo- - 16 j
i a
330 -- 14
/
350 -- 14 r*'*
, j
,. './
l 300 --
i 300 --- 12
/
- 12 250 -- 10
/
250 -- 10 200 -
8 200 -
8 15 0 --6 150 --6 l
100 --
-4
,/
10 0 --4 50 --- 2 50 --2 0 -- O i
i i
ig g
g i
i i
i O--O I
0 1 2 3 4 S 6
7 8 9 10 11 O
I 2
3 4 5 6 7 8 9 10 11 NUMBER OF ANNULI NUMBER OF ANNULI NORTH OF VERNON DAM SOUTH OF VERNON DAM I
FIGUR E 8.9
-185-
L i
r 1
I I
I LITERATURE CITED s
I f
{
APHA et al.
1976.
Standard methods for the examination of water and wastewater.
14th edition.
Published jointly by American I
Public Health Asscaiation, American Water Works Association l
and Water Pollution Control Federation; Washington, D.C.
Aquatec, Incorporated.
1975.
Ecological studies of the Connecticut River, Vernon, Vermont.
Report IV, January-December 1974.
Report prepared for Vermont Yankee Nuclear Power Corporation.
1976.
Ecological studies of the Connecticut River, Vernon,
(
Vermont.
Report V, January-December 1975.
Report prepared for Vermont Yankee Nuclear Power Corporation.
1979.
Hydrothermal and biological studies, Connecticut River, Vernon, Vermont.
Phase V October 1977-May 1978.
Report prepared for Vermont Yankee Nuclear Power Corporation.
I I
1
-187-I

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