Text

Rept on Radioactive Effluent Releases & Waste Disposal,Jul- Dec 1979
	ML19296D543
Person / Time
Site:	Humboldt Bay
Issue date:	12/31/1979
From:	; PACIFIC GAS & ELECTRIC CO.
To:	;
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ML19296D541	List: ML19296D540; ML19296D543; ML19296D544; ML19296D545;
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	NUDOCS 8003050218
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s PACIFIC CAS AND ELECTRIC COMPAhi DOCKET NO. 50-133 REPORT ON RADIOACTIVE EFFLUENT RELEASES AND WASTE DISPOSAL R llUMBOLDT BAY POWER PLANT UNIT NO. 3, COVERING THE PERIOD JULY 1,1979 THROUGli DECEMBER 31, 1979 This report summarizes the quantity of each of the principal radio-nuclides released to unrestricted areas in liquids and gaseous effluents and summarizes radioactive waste disposal from July 1, 1979 through December 31, 1979 and is submitted in accordance with Section IX.I.3.a.

of the Technical Specifications.

A.

SUPPLEMENTAL INFORMATION 1.

Regulatory Limits a.

Fission and activation gases:

The current license limits 50,000 uCi per second for an annual average release are rate and 500,000 pCi per second for an instantaneous release.

b.

Iodines:

Refer to c., "Particulates."

c.

Particulates:

The limit "for halogens and particulate material based on the isotopes present on the sampling filters after 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months decay period" is 0.18 pCi/sec.

d.

Liquid Effluents:

10CFR20 2.

Maximum Permissible Concentrations Provide the MPC's used in determining allowable release rates or concentrations.

a.

Fission and activation gases:

not applicable b.

Iodines:

3x10-10 pCi/cc c.

Particulates, half-lives >8 days: 3x10-10 pCi/cc d.

Liquid effluents:

10CFR20, Table II, Appendix B.

3.

Average Energy Not applicable.

8006050

s 4.

Measurements and Approximations of Total Radioactivity The methods used to measure or approximate the total radio-activity in effluents and the methods used to determine radio-nuclide composition are as follows:

a.

Fission and activation gases:

During operation, samples (of air ejector off-gas) are taken at least monthly for Sodium Iodide gamma spectrum analysis and, based on six measurable nuclides (Xel38, Kr87, Kr88, Kr85m, Xe135, and Xe133), the remaining nuclides in the mixture are estimated. This analysis is used to calibrate the gross counting results of routine samples which are then used to calibrate the stack con-tinuous monitors.

Daily average release rates determined from the stack monitors are used to derive total quantity of the mixtures released, and individual nuclides are proportioned according to the mixture found from the monthly analysis.

b.

Iodines:

Charcoal cartridges are removed from the stack sampling system weekly and after 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months decay are gamma spectrum counted for I-131 and 1-133 (with a Sodium Iodide detector).

c.

Particulates:

Filter papers are removed from the stack sampling system weekly and gross beta counted after 48 hour5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months decay.

After 7 days they are recounted to determine Batal40 (Sodium Iodide detector).

Filters for each quarter are decay counted to determine other particulates (long-lived), sipha emitters, and then analyzed for Sr89 and Sr90.

d.

Liquid Effluents:

Waste receiver tank and waste hold tank batch samples are gamma spectrum analyzed (Sodium Iodide detector) and gross Beta and gross Gamma counted.

If the nuclides identified do not account for the gross gamma count, the mixture is proportionately adjusted.

If the gross beta count indicates more activity than the adjusted mixture, the excess activity is recorded as " Additional But Other-wise Unspecified."

La indry waste tanks are individually analyzed only by gross beta and gross gamma.

A monthly composite is anc.yzed as above.

A quarterly composite of all batches is analyzed for Tritium, Sr89 and Sr90. The strontium results are sub-tracted from " Additional But Otherwise Unspecified" activity, and if necessary, increased to account for the eXCe9s.

5.

Batch Releases a.

Liquid:

1)

Number of batch releases:

17 (A total of 1,994 gallons of laundry waste and 53,480 gallons of treated waste tank discharge.)

2)

Total time period for batch releases: 40.7 hours8.101852e-5 days 0.00194 hours 1.157407e-5 weeks 2.6635e-6 months 3)

Maximum time period for a batch release: 5.8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months 4)

Average time period for batch releases: 144 minutes 5)

Minimum time period for a batch release: 10 minutes 6)

Average stream flow during periods of release of effluent into a flowing stream:

Discharge is into Humboldt Bay.

6.

Abnormal Releases a.

Liquid:

1)

Number of releases: None 2)

Total activity released: None b.

Gaseous:

1)

Number of releases: None 2)

Total activity released: None B.

GASEOUS EFFLUENTS The monitoring systems associated with the emergency condenser and liquid radwaste system vents to atmosphere indicate that no detectable releases of radioactive gases occurred during the report period.

Therefore, only gaseous radioactive waste releases made via the 250 foot stack are reported.

Table B1 summarizes the total quantities of radioactive effluents released by quarter.

Table B2 summarizes the total quantities for each of the nuclides determined to be released.

C.

LIQUID EFFLUENTS The activity in each batch of liquid radioactive waste was either in solution at the time of discharge or the batch was filtered prior to discharge.

Analysis of weekly composite samples from the plant effluent canal and monitoring by the liquid waste discharge monitor confirmed that no uraccounted release of radioactive waste occurred during the report pcriod.

Table Cl summarizes the total quantities of radioactive effluents released by quarter. Table C2 summarizes the total quantity for each of the nuclides determined to be released.

D.

SOLID WASTE During the report period a total of 91 cubic meters of evaporator bottoms and resin (both solidified with Urea Formaldehyde), totaling 3,350 Curies, was shipped. Table D1 summarizes the radioactive waste material shipments.

E.

ENVIRONMENTAL MONITORING The environmental monitoring program was continued unchanged during this period.

Quarterly reports, " Environmental Radiation Study in the Vicinity of Humboldt Bay Power Plant (HBPP), Eureka, California,"

contain the basic radiologic data collected from the Humboldt Bay Power Plant environs. The most recent reports issued, Nos. 73 and 74, are attached and contain data from the second and third quarters of 1979. Although data collected during the fourth quarter have not been issued in report form, the dosimeter data from this period was included in the analysis detailed below.

The quarterly reports describe the sampling locations, total number of samples of each media sampled, and the measured radioactivity concentration in the samples.

The types of media sampled are marine flora, fish, and invertebrates; bottom sediment; milk; air particulates; and external radiation exposure measured by ion chambers.

Plant releases continued to be much lower than when the plant last operated. The calculated potential public exposures due to the plant releases were very low at that time. Therefore, potential exposure calculations were determined only from the dosimetry data.

There are currently 30 dosimetry stations (Figure lE) in the vicinity of the plant.

Ionization chambers, read on a biweekly basis, are used for dosimetry.

Stations 2 and 5 are considered to be background in that they are assumed to be completely removed from the influence of the plant.

In order to test for statistically significant difference between stations, two statistical tests (a two-way classification, and a 95 percent confidence limit least significant difference test) were made using biweekly dosimeter readings for each station.

No stations were statistically above background for the last half of 1979.

The exposure extrapolated to one year from the background Stations 2 and 5 was 86.9 milliroentgens per year (mR/yr).

The extrapolated exposure measured at the other stations ranged from a high of 103.6 mR/yr at Station 27 to a low of 72.4 mR/yr at Station 25.

F.

METEOROLOGICAL DATA Wind speed and direction ar.d temperature differential are presently recoided on strip charts, but the meteorological data logging system was removed from service in 1967. Therefore, the information specified by Regulatory Guide 1.21, Appendix B. Section F, is not readily available for 1977.

Table F1 summarizes the cumulative joint frequency distribution of wind speed, wind direction, and atmospheric stability for the period April, 1962 through June, 1967 when the meteorological data logging system was in service.

TABLE B1 EFFLUENT AND WASTE DISPOSAL SEMIANNUAL REPORT 1979 GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES Est.

Third Fourth Total Unit Quarter Quarter Error 2

A.

Fission & activation gases 1.

Total release Ci LT 1.1E-5 LT 1.1E-5 2.00El ii 2.

Average release rate for period pCi/sec LT 3.38E-6 LT 1.38E-6 l 3.

Percent of Technical i

Specification limit lLT 2.77E-9

,LT 2.77E-9 B.

Iodines 1.

otal iod ine-131 Ci LT 1.00E-6 LT 1.00E-6

. 50El 2.

Average release rate for period (I-131) vCi/sec LT 1.27E-7 LT 1.27E-7 3.

I er c( nt ef Technical I

Specification limit iLT 7.06 E-5 I LT 7.06E-3 C.

Particulates 1.

Particulates with half-lives >8 days Ci 2.46E-5 1.87E-5 1.50El 2.

Average release rate for period pCi/sec 3.13E-6 2.38E-6 3.

Percent o: Technical Specification limit 1.74E-3 1.32E-3 4.

Gross alpha radioactivity Ci 3.98E-8 5.64E-8 {

D.

Tritium j

i 1.

Total release Ci LT 1.00E-2

'LT 1.00E-2 5.00El 2.

Average release rate 7 -3 LT 1.27E-3 for period pCi/sec,

TABLE B2 EFFLUENT AND WASTE DISPOSAL SE31 ANNUAL REPORT 1979 GASEOUS EFFLUENTS - ELEVATED RELEASE Continuous Mode

' Nuclides Released Unit Third I

Fourth l

l Quarter Quarter l

1.

Fission gases krypton-83M Ci IT 1 nnr A**

LT 1.00E-6**

! krypton-89 Ci LT 1.00E-6**

LT 1.00E-6**

! krypton-85M Ci LT 1.00E-6**

LT 1.00E-6**

krypton-87 Ci LT 1.00E-6**

LT1.00E-6**j LT 1.00E-6**

krypton-88 Ci LT 1.00E-6**

_ xenon-133 Ci LT 1.00E-6**

LT 1.00E-6**

xenon-135 Ci LT 1.00E-6**

LT 1.00E-6**

xenon-135m Ci LT 1.00E-6**

LT 1.00E-6**

xenon-138 Ci LT 1.00E-6**

LT 1.00E-6**

xenon-137 Ci LT 1.00E-6**

LT 1.00E-b**

xenon-133m Ci LT l.00E-6**

LT 1.00E-6**

Total for period Ci LT 1.10E-5 LT 1.10E-5 2.

Iodines iodine-131 Ci LT 1.00E-6**

LT 1.00E-6**

iodine-133 Ci LT 1.00E-6**

LT 1.00E-6**

iodine-135 Ci LT 1.00E-6**

LI_1100E-6**

Total for period Ci LT 3.00E-6 LT 3.00E-6 3.

Particulates

[ strontium-89 l 'Ci LT 1.00F-6**

I.T 1. 00E-6 * *

' strontium-90 C1 1.12E-6 1.37E-6 cesium-134 Ci LT 2.00E-6*

LT 2.00E-6*

cesium-137 Ci 3.50E-6 2.79E-6 _ !

LT 1. 00_E-6*

j barium-lanthanum-140 Ci LT T. 00E-6 *

cobalt-60 C1 1.25E-5 7.04E-6 I

manganese-54 Ci LT 2.00E-6*

LT 2.00E-6*~~

cerium-144 Ci LT 1.50E-6*

L 1.50E-6*

The minimum sensitivity of the plant's Sodium Iodide spect rometer system for a particular'nuclide depends upon the mixture of nuclides present in each batch, therefore, some nuclides not detected could be present at leve:s comparable to those detected. Those nuclides expected to be present, but not detected, are reported "Less Than" (LT) typical quarter Curie maximum quantities.

No release was detected due to the decay time since the unit was shutdown on July 2, 1976.

Quantities reported are an arbitrary 1 micro-curie.

TABLE Cl EFFLUENT AND WASTE DISPOSAL SEMIANNUAL REPORT 1979 LIQUID EFFLUENTS - SUMMATION OF ALL RELEASES lEst.

Third Fourth ! Total I

Unit Quarter l

Quarter Error i

A.

Fission and activation products 7-1 1.

Total release (not including l

t rit iucuases alpha)

C1 1.25E-2 4.40E-2 1.50E1 2.

Average diluted concentra-tion during neriod UCi/ml 4.84E-10 1.67E-9 i 3.

Percent of applicable limit 2.13E-3 1.19E-2 L

B.

Tritium 8.42E-3 4.00E0

)

7.82E.{ [ *_

~

1 5t d rel Ne Ci 2.

Average diluted concentra-tion during period 1:Ci/ml 3.03E-ll 3.20E-10 3.

Percent of applicable limit 1.01E-6 1.07E-7 C.

Dissolved and entrained gases T

1.

Total release Ci LT 2.00E-6 LT 2.00E-6,5.00El D.

Gross alpha radioactivity 1.

Total release Ci 4.21E-6 2.40E-6 7.50El E.

Volume of waste released l

(prior to dilution 1 liter 5.61E 4 1.59E 5

5.00E0

~F.

Volume of dilution wate7 used durin g eriod_

liter 2.58E 10 2.63E 10 5.00E0

~* The minimum sensitivity of the plant's Sodium Iodide spectrometer system f or a particular nuclide depends upon the mixture of nuc lides present in each batch, therefore, some nuclides not detected could be present at levels comparable to those detected. Those nuclides expected to be present,

but not detected, are reported "1. css Than" (LT) typical quarter Curie maximum quantities.

TABLE C2 EFFLUENT AND WASTE DISPOSAL SEMI ANNUAL REPORT 1979 LIQUI] EFFLUENTS Batch mode Nuclides Released Uniti First Second Quarter Quarter i

l strontium-89 Ci

! LT 1.00E-6**

LT 1.00E-6**

strontium-90 Ci i

3u05E-6 2 12E _4 cesium-134 Ci 9.08E-4 4.02E-3 cesium-137 C1 6.34E-3 3.46E-2 l iodine-131 Ci LT 1.00E-6**

LT 1.00E-6**

cobalt-58 Ci LT 1.00E-6**

LT 1.00E-6**

cobalt-60 C1 3.96E-3 2.94E-3*

zinc-65 Ci LT 1.00E-4*

LT 1.00E-4*

i imanganese-54 Ci 8.65E-4 LT 3.00E 3 I

ichromium-51 Ci LT 1.00E-6**

LT 1.00E-6**

f zirconium-niobium-95 Ci__1_1?r1.00E-6**

! LT 1.00E-o**

j l molybdenum-99 Ci LT 1.00E-6**

ILT 1.00E-6**

i i barium-lanthanum-140 Ci LT 1.00E-6**

l LT ].00E-6 **

i i technetium-99m Ci LT 1.00E-6**

lLT 1.00E-6**

i I c e rium-144 i

{

I Ci 2.82E-4 l

1.12E-3,

neptunium-239 Ci l LT 1.00E-6 *

LT 1.00E-6**

l LTotal for period (above)

I Ci l

1.25E-2 l

4.40E-2 I

xenon-133 Ci LT 1.00E-6**

6LT 1.00E-6**

j xenon-135 l Ci l LT 1.00E-6 **

LT 1.00E-6**

j The minimum sensitivity of the plant's Sodium Iodide spectrometer system for a particular nuclide depends upon the mixture of nuclides present in each batch, theref ort som3 nuclides not detected could be present at levels coqurable to those letected.

Those nuclides expected to be present, but not detected, ar' reported "Less Than" (LT) typical quarter Curie maximum quantities.

No release was detected due to the decay time since the unit was shutdown on July 2, 1976.

Quantities reported are an arbitrary 1 micro-curie.

TABLE D1 EFFLUENT AND WASTE DISPOSAL SEMIANNUAL REPORT SECOND HALF OF 1979 SOLID WASTE AND IRRADIATED FUEL SHIPMENTS A.

Solid Waste Shipped Offsite for Burial or Disposal (not irradiated fuel)

Est.

1.

Type of Waste Unit Ouantity Total Error a.

Solidified evaporator bottoms m3 9.06 El 1.0 El and solidified demineralizer re sin s Ci 3.35 E3 2.5 El 3

b.

Dry compressible waste, m

None contaminated equip., etc.

C1 2.

Estimate of major nuclide composition (by type of waste) a.

Cesium-134 7.84 E0 Cesium-137 5.43 El Unidentified Mixed 2.42 E0 Fission Products Cobalt-60 3.00 El Mancanese-54 5.42 EO b.

Cesium-134 Cesium-137 Unidentified Mixed 7,

Fission Products Cobalt-60 Manganese-54 3.

Solid Waste Disposition Number of Shipments Mode of Transportation Destination 16 Truck (Sole Use)

Richland, Washington B.

Irradiated Fuel Shipments (Disposition)

Number of Shipments Mode of Transportation None

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TABLE Fl PERCENT OF PERIOD AT EACH WIND SPEED AND DIRECTION PERIOD OF RECORD:

April, 1962 through June 1967 4

STABILITY CLASS:

C ELEVATION:

250 feet Wind Speed (mph) at 76m Level Wind Direction (0) 0-3 4-7 8-12 13-18 19-24

>24 Total l 0.

0.02 0.06 0.05 0.03 0.02 0.01 0.20 10.00 0.02 0.03 0.04 0.03 0.01 0.00 0.12 20.00 0.03 0.03 0.01 0.01 0.00 0.00 0.08 30.00 0.02 0.02 0.00 0.00 0.00 0.00 0.04 40.00 0.00 0.01 0.00 0.01 0.00 0.00 0.02 50.00 0.01 0.01 0.00 0.00 0.00 0.00 0.02 60.00 0.01 0.01 0.00 0.00 0.00 0.00 0.03 70.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 80.00 0.01 0.00 0.00 0.00 0.00 0.00 0.01 90.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 100.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 110.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 120.00 0.01 0.01 0.01 0.00 0.00 0.00 0.03 130.00 0.01 0.01 0.00 0.01 0.00 0.00 0.03 140.00 0.00 0.01 0.01 0.00 0.01 0.00 0.02 150.00 0.00 0.01 0.01 0.02 0.01 0.00 0.06 160.00 0.00 0.01 0.01 0.01 0.01 0.00 0.04 170.00 0.00 0.00 0.02 0.02 0.01 0.01 0.07 180.00 0.00 0.01 0.02 0.02 0.00 0.00 0.05 190.00 0.01 0.01 0.01 0.01 0.01 0.00 0.04 200.00 0.00 0.02 0.02 0.02 0.00 0.01 0.09 210.00 0.02 0.03 0.06 0.02 0.01 0.00 0.13 220.00 0.01 0.02 0.08 0.04 0.03 0.02 0.19 230.00 0.01 0.06 0.12 0.14 0.05 0.02 0.39 240.00 0.01 0.09 G 22 0.15 0.02 0.03 0.51 250.00 0.02 0.18 0.26 0.10 0.02 0.00 0.58 260.00 0.02 0.13 0.24 0.04 0.01 0.00 0.44 270.00 0.02 0.16 0.22 0.02 0.01 0.00 0.42 280.00 0.02 0.13 0.11 0.01 0.00 0.00 0.27 290.00 0.02 0.10 0.10 0.01 0.01 0.00 0.24 300.00 0.01 0.09 0.06 0.00 0.00 0.00 0.15 310.00 0.01 0.04 0.06 0.01 0.00 0.00 0.12 320.00 0.01 0.03 0.05 0.01 0.01 0.01 0.12 330.00 0.01 0.03 0.03 0.01 0.02 0.01 0.11 340.00 0.01 0.04 0.04 0.03 0.02 0.01 0.15 350.00 0.01 0.02 0.06 0.07 0.05 0.01 0.22 Rows may not sum to exact total due to rounding of f.

TABLE F1 (con *.)

PERCENT OF PERIOD AT EACH WIND SPEED AND DIRECTION PERIOD OF RECORD: April 1962 through June 1967 STABILITY CLASS:

D ELEVATION:

250 feet Wind Speed (mph) at 76m Level Wind Direction 0-3 4-7 8-12 13-18 19-24

>24 Total 0.00 0.11 0.34 0.78 0.85 0.49 0.48 3.05 10.00 0.04 0.27 0.52 0.46 0.38 0.27 1.95 20.00 0.05 0.21 0.32

0. 19 0.16 0.11 1.04 30.00 0.06 0.20 0.16 0.08 0.03 0.04 0.58 40.00 0.05 0.11 0.05 0.02 0.00 0.01 0.23 50.00 0.03 0.05 0.08 0.00 0.01 0.00 0.16 60.00 0.04 0.08 0.04 0.00 0.00 0.00 0.15 70.00 0.04 0.02 0.01 0.01 0.00 0.00 0.08 80.00 0.02 0.04 0.00 0.01 0.00 0.00 0.07 90.00 0.01 0.04 0.03 0.00 0.00 0.00 0.09 100.00 0.02 0.01 0.02 0.00 0.00 0.00 0.05 110.00 0.00 0.03 0.01 0.01 0.01 0.00 0.06 120.00 0.02 0.03 0.03 0.02 0.01 0.00 0.11 130.00 0.01 0.03 0.02 0.02 0.01 0.00 0.10 140.00 0.02 0.03 0.02 0.04 0.01 0.01 0.13 150.00 0.03 0.03 0.03 0.09 0.03 0.02 0.23 160.00 0.01 0.04 0.05 0.10 0.04 0.01 0.26 170.00 0.02 0.05 0.12 0.16 0.04 0.01 0.40 180.00 0.04 0.08 0.12 0.13 0.03 0.01 0.40 190.00 0.02 0.07 0.09 0.06 0.03 0.02 0.28 200.00 0.05 0.10 0.17 0.11 0.02 0.01 0.46 210.00 0.05 0.12 0.20 0.08 0,04 0.01 0.51 220.00 0.05 0.14 0.14 0.12 0.05 0.02 0.51 230.00 0.03 0.14 0.17 0.11 0.06 0.02 0.53 240.00 0.08 0.22 0.21 0.06 0.03 0.01 0.61 250.00 0.08 0.17 0.13 0.04 0.01 0.00 0.43 260.00 0.08 0.22 0.13 0.02 0.01 0.00 0.47 270.00 0.12 0.21 0.11 0.03 0.01 0.00 0.49 280.00 0.05 0.20 0.'1 0.04 0.00 0.00 0.40 290.00 0.04 0.22 0.11 0.02 0.00 0.00 0.39 300.00 0.10 0.21 0.20 0.02 0.01 0.00 0.53 310.00 0.08 0.28 0.19 0.03 0.02 0.01 0.60 320.00 0.07 0.25 0.33 0.09 0.04 0.01 0.80 330.00 0.06 0.21 0.35 0.16 0.09 0.03 0.90 340.00 0.07 0.24 0.50 0.47 0.17 0.08 1.53 350.00 0.07 0.30 0.82 0.86 0.49 0.33 2.87 4

TABLE F1 (cont)

PERCENT OF PERIOD AT EACH WIND SPEED AND DIRECTION PERIOD OF RECORD:

April 1962 through June 1967 STABILITY CLASS:

E ELEVATION:

250 feet Wind Speed (mph) at 76m Level Wind Direction 0-3 4-7 8-12 13-18 19-24

>24 Total 0.00 1.04 1.06 2.00 1.84 0.82 0.10 6.86 10.00 0.17 0.80 1.55 0.90 0.36 0.10 3.78 20.00 0.30 0.83 1.26 0.47 0.13 0.00 2.99 30.00 0.37 0.73 0.64 0.19 0.01 0.00 1.94 40.00 0.21 0.60 0.47 0.02 0.00 0.00 1.31 50.00 0.18 0.56 0.28 0.02 0.00 0.00 1.05 60.00 0.21 0.54 0.19 0.00 0.00 0.00 0.93 70.00 0.19 0.44 0.07 0.00 0.00 0.00 0.81 80.00 0.20 0.41 0.07 0.00 0.00 0.00 0.68 90.0C 0.27 0.47 0.17 0.01 0.00 0.00 0.82 100.00 0.17 0.24 0.06 0.01 0.00 0.00 0.49 110.00 0.20 0.31 0.10 0.00 0.00 0.00 0.60 120.00 0.18 0.31 0.19 0.01 0.02 0.00 0.70 130.00 0.14 0.25 0.09 0.08 0.03 0.03 0.72 140.00 0.09 0.22 0.21 0.23 0.22 0.25 U. 21 150.00 0.09 0.24 0.22 0.45 0.52 0.46 2.08 160.00 0.05 0.22 0.25 0.62 0.44 0.21 1.79 170.00 0.04 0.26 0.43 0.73 0.23 0.09 1.89 180.00 0.26 0.32 0.45 0.43 0.20 0.02 1.77 190.00 0.15 0.26 0.37 0.35 0.15 0.02 1.20 200.00 0.22 0.48 0.47 0.26 0.18 0.06 1.77 210.00 0.20 0.44 0.58 0.18 0.05 0.04 1.60 220.00 0.20 0.40 0.55 0.15 0.14 0.03 1.37

'30.00 0.23 0.43 0.40 0.14 0.13 0.05 1.39 240.00 0.24 0.39 0.23 0.15 0.13 0.01 1.24 250.00 0.21 0.32 0.16 0.03 0.01 0.01 0.84 260.00 0.24 0.31 0.17-0.03 0.00 0.00 0.85 270.00 0.35 0.35 0.13 0.12 0.01 0.00 0.97 280.00 0.19 0.30 0.15 0.01 0.01 0.01 0.67 290.00 0.19 0.33 0.17 0.01 0.01 0.01 0.81 300.00 0.21 0.37 0.16 0.01 0.00 0.01 0.88 310.00 0.20 0.47 0.29 0.02 0.00 0.00 0.98 320.00 0.20 0.59

0. 65 0.12 0.01 0.05 1.72 330.00 0.22 0.87 0.98 0.35 0.02 0.02 2.45 340.00 0.20 0.68 1.55 0.74 0.01 0.00 3.48 350.00 0.19 1.02 2.02 1,41 0.55 0.13 5.22

t7' TABLE F1 PERCENT OF PERIOD AT EACH WIND SPEED AND DIRECTION PERIOD OF RECORD: April 1962 through June 1967 STABILITY CLASS:

F ELEVATION:

250 feet Wind Speed (mph) at 76m Level Wind Direction 0-3 4-7 8-12 13-18 19-24

>24 Total 0.00 0.42 0.08 0.03 0.00 0.00 0.00 0.53 10.00 0.05 0.06 0.05 0.01 0.00 0.00 0.18 20.00 0.05 0.09 0.06 0.03 0.00 0.00 0.24 30.00 0.12 0.11 0.10 0.04 0.00 0.00 0.37 4J.00 0.07 0.13 0.10 0.03 0.01 0.00 0.34 50.00 0.09 0.13 0.06 0.00 0.00 0.00 0.27 60.00 0.14 0.19 0.07 0.01 0.00 0.00 0.40 70.00 0.11 0.22 0.08 0.00 0.00 0.00 0.40 80.00 0.10 0.22 0.07 0.00 0.00 0.00 0.39 90.00 0.14 0.25 0.07 0.00 0.00 0.00 0.46 100.00 0.11 0.29 0.09 0.01 0.01 0.00 0.51 110.00 0.13 0.31 0.13 0.02 0.00 0.00 0.59 120.00 0.15 0.33 0.18 0.03 0.00 0.00 0.69 130.00 0.10 0.23 0.14 0.02 0.00 0.00 0.50 140.00 0.10 0.22 0.11 0.09 0.02 0.00 0.54 150.00 0.12 0.19 0.10 0.07 0.03 0.02 0.52 160.00 0.08 0.15 0.16 0.08 0.01 0.00 0.47 170.00 0.07 0.15 0.14 0.07 0.00 0.00 0.43 180.00 0.16 0.26 0.13 0.02 0.00 0.00 0.56 190.00 0.12 0.18 0.13 0.02 0.00 0.01 0.46 200.00 0.13 0.25 0.18 0.02 0.00 0.00 0.58 210.00 0.18 0.32 0.20 0.02 0.00 0.01 0.73 220.00 0.14 0.28 0.09 0.02 0.00 0.00 0.54 230.00 0.18 0.24 0.07 0.01 0.01 0.00 0.50 240.00 0.19 0.19 0.05 0.02 0.00 0.00 0.45 250.00 0.15 0.16 0.01 0.00 0.00 0.00 0.32 260.00 0.17 0.10 0.01 0.00 0.00 0.00 0.29 270.00 0.18 0.09 0.01 0.00 0.00 0.00 0.28 280.00 0.10 0.04 0.01 0.00 0.00 0.00 0.15 290.00 0.11 0.05 0.01 0.00 0.00 0.00 0.16 300.00 0.13 0.07 0.00 0.00 0.00 0.00 0.19 310.00 0.07 0.05 0.01 0.00 0.00 0.00 0.13 320.00 0.09 0.05 0.03 0.00 0.00 0.00 0.17 330.00 0.09 0.09 0.01 0.00 0.00 0.00 0.19 340.00 0.06 0.10 0.03 0.01 0.00 0.00 0.20 350.00 0.07 0.09 0.05 0.01 0.00 0.00 0.21

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ML19296D543

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