ML20134Q259

Forwards Addl Ref Matl Re Background Concentrations of Molybdenum in Seawater

ML20134Q259
Person / Time
Site:	Millstone
Issue date:	02/12/1997
From:	Scace S NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To:	Grier J CONNECTICUT, STATE OF
References
D10812, SES-97-GN-026, SES-97-GN-26, NUDOCS 9702260346
Download: ML20134Q259 (27)

Text

,

1 14ht m ada.s.=i,m.m.,er esos7 i, \ Utilldes Sysiam N.,6 nnam-se c pr N P.o.a m 270 H.rd.ed, CT 061410270 l

(sos p acoo l

} February 12,1997 1

! l

! SES-97-GN-026 l

j D10812 i s

! Mr. James Grier .

Supervising Sanitary Engineer l l Water Management Bureau l

Department of Environmental Protection '

j 79 Elm Street -

1 Hartford, CT 06106 5127 i

) ,

l

Dear Mr. Grier:

l j Millstone Station l NPDES Permit No. 0003263 I j -

Sunclemental Information for Med,denum l i j

Reference:

Letter D10765 from S. Scace to J. Grier dated February 5,1997 4

i Northeast Nuclear Energy Company (NNECO) recently submitted supplemental information in  ;

l support of its request to use of LCS - 1000 as a corrosion inhibitor in the Millstone Unit 1 '

Closed Cooling Water Systems (Reference). Subsequent to that submittal, you requested l additional reference material regarding background concentrations of molybdenum in seawater. This information is included as Attachment 1. ,

in addition, Mr. Paul Jacobson of NNECO informed you by phone on February 10,1997 that  ;

i he had become aware that the manufacturer had sent the wrong formulation of LCS - 1000 l used in bionssay tests performed at the NU Environmental Laboratory (NUEL) between l l December 31,1996 and January 4,1997. The formulation proposed for use and the )

i formulation tested are identical except that sodium carbonate was included at a concentration i of 0.283% in samples for which the bionssay testing was performed. Sodium carbonate has been eliminated in the formulation which we will actually use in the cooling water system.

1 Bioassay testing is currently being performed on the correct formulation (ie. without sodium

! carbonate) and this information will be forwarded to you upon completion. As requested, a j letter from Calgon Corporation explaining their error and the slight differences in the two i formulations is included as Attachment 2.

i  !

very truiy your.,

s NORTHEAST NUCLEAR ENERGY COMPANY

o50139 i

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! r Scace -

d[deh l 0

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j Dweetor- Nuclear Engineering Programs j cc: M. Harder

}- NRC i 9702260346 970212 PDR ADOCK 05000245 P PDRE

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i. Attachment 1.

! Sackground Concentrations of Molybdenum in Sea Water

Reference:

Millstone Nuclear Power Station Unit 3 4 Environmental Report - Operational License Stage j Seetion2.4 Hydrology i

1 1

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i i i MNPS-3 EROL5

]' 2.4 NYDR05.00Y l 2.4.1 Surface Water 1

l The public water supplies within a 32-km (20-mile) radius of the site

are identified on Figure 2.4-1. The characteristics of these public l water supplies are listed in Table 2.4-1. The information contained

! on Figure 2.4-1 and Table 2.4-1 was furnished by the Bureau of

! sanitary Engineering of the Connecticut State Health Department. The ,

j nearest surface public water supply is the New London Water company's

, Lake Konomac, 9.2 km (6 miles) north-northwest of the site.

! N> surface drainage from the site could affect this reservoir because j of the distance involved, the surface conditions,the expected i groundwater gradient from the reservoir area to the site, and the i generally impervious nature of the overburden on and near the site.

l The bedrock surface is exposed at the south end of the site, but i covered with a dense glacial till at the north end. Because both are

quite impervious, precipitation does not permeate into it readily, j and much of the precipitation runs off the surface directly into Niantic Bay or Jordan Cove. Some surface water collects in l depressions in the northern part of the site. .

i l There are no major rivers or: streams in the vicinity of Millstone l Point, nor are there any water courses on the site. A number of l .

small brooks flow into the Niantic River and then to Niantic Bay, I west of the site. Any flooding of these brooks would not directly l affect the site or significantly raise the water levels in Niantic

! Say, Jordan Cove, or Long Island sound in the vicinity of the site.

! All site drainage, including the roofs of safety related buildings, i vill be designed on the basis of the probable maximum precipitation j to assure against the local flooding of station facilities.

j 2.4.2 Groundwater

(

! The M111stene site has several shallow wells on it, the nearest being

about 1.2 km (3/4 mile) from the station area (Figure 2.4-2). None of these provides water for domestic purposes, but one is used to j water a nearby baseball field and to supply a drinking fountain at i the field. Ridges of granite between the station and these wells i create a drainage divide which would keep any water or chemicals l accidentally released from the station from reaching these wells.

! Groundwater observations at the site have been documented in previous j reports (EEAsco 1966: Bechtel Corp. 1969). Observations of the water levels in the granite quarry at the site show that the water level in

the quarry, before the existing discharge channel opened to the 5

! ocean, typically lay approximately 5.2 meters (17 feet) below the i

! level of the adjacent Long Island sound. It is significant that this

! quarry was worked for over 100 years (1830 to 1960) at distances of 3

as little as 61 meters (200 feet) from the waters of Long Island sound without experiencing notable inflows of water.

)

j

] Amenibnent 5 2.4-1 January 1984 l

i

pi i

'. NNPS-3 EADLS 4 .

These observations confirm previous findings documented during the Millstone 2 construction phase that the permeabilities of the bedrock 3

l and the overlying ablation till and the dense basal till are i extremely low. Little or no groundwater flow has been cbserved in

the crystalline bedrock, and virtually all of the groundwater i movement is restricted to the soil overburden. Measurements taken

, during previous investigations in August 1969 showed average influz i rates into 0.61 meter a 3.7 meters (2 feet by 12 feet) by 3-meter i (10-feet) deep test pits of about 30.3 liters (8 gallons),per hour.

l l Observations at the site prior to construction of Millstone 3 were

{ made in several borings between 1971 and 1973. Fiesametric surface j , readings of these boreholes appear to be subject to considerable .

1 seasonal fluctuations and vary with locations. A stabilised '

i groundwater level pontour map, based on therseasonal high water l 1evels measured in January 1972, and extrapolation of data to post-construction site conditions, were plotted. This map (Figure 2.4-3) is representative of higher than average water level reading as

! determined during the site study and from visual observations during

construction. Figure 2.4-3 also indicates a groundwater piesometric l . surface with a 3-percent gradient generally sloping from northeast to

• i southeast. .

t Localized perched groundwater conditions probably exist because of the irregular distribution of ablation till materials of varying j gradation and porosity. It is also likely that shallow, ponded water j

exists in localized bedrock troughs.

outcrops to the north and northwest of 'the site indicates that The prevalence of bedrock j i bedrock acts as a groundwater divide, isolating the soils of the tip

of Millstone Point from soils further inland. Thus, groundwater l recharge would primarily be due to absorption of local precipitation,

with probable migration to the waters of the immediate adjacent Long

Island sound.

l Water pressure tests were also performed in three boreholes and j during installation of rock anchors in the turbine and service j building. These tests indicated that the rock within the site ares

is generally massive with slight to moderate interconnecced

icinting.

Low pressures observed from these tests, as tabulated in

! Table 2.5.4-16 of the Millstone 3 FSAR, further verified the low permeability of the rock mass.

2.4.3 Oceanography l

4 2.4.3.1 Tides l; Normal tides at Millstone Point are semidiurnal with a wan range of 0.82 meter (2.7 feet) and a spring range of 1 meter (3.2 feet). The

mean period of the tide is 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />s-25 minutes. Tides in excess of

) the mean high water occur on an average as fol2ows: in excess of 0.9 meter (3 feet), about once a years in excess of 0.6 meter i (2 feet), about 5 times a years and in excess of 0.3 meter (1 foot),

• j about 98 times a year.

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j 2.4-2 i

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1 .

MHP5-3 EROLS f) 2.4.3.2 Tides and Flooding Due to storms j since Millstone Point is a peninsula which projects into Long Island 4 Sound, it is subjected to tidal flooding from severe storms. The i highest such flooding has resulted from the passage of hurricanes.

New England Corps. of Engineers (1965), Harris (1963), and Redfield and Miller (1957) indicate that twelve severe hurricanes have crossed i coastal southern New England since 1635 and that four of these storms j occurred in the past 44 years. These most recent storms include the j hurricanes on September 21, 1938

September 14, 1944: August 31, i 1954: and september 12, 1960. The center of the september 1938 storm crossed the connecticut coast about 24 km (15 miles) east of New l . Naven and about 32 lan (20 miles) west of Millstone Point. The center

. of the 1944 hurricane passed inland between charlestown and Point l Judith, Rhode Island, about 56 km (35 miles) east of Millstone Point.

l The center of the August 1954 storm crossed the Connecticut Coast in

the vicinity of Millstone Point. The center of the September 1960 i storm also crossed the coast in the vicinity of Millstone Point. The

, maximum flood tide levels recorded in the vicinity of Millstone Point j during these storms are indicated below i . Maximum Flood Tide Levels j ,

Murricane Mean see Level (ms1)

September 21, 1938 3.0 meters (9.7 feet) i september 14, 1944 1.9 meters (6.2 feet)

. August 31, 1954 2.7 meters (8.9 feet)

September 12, 1960 1.8 meters (6.0 feet) l I

! The design storm surge level at the site was computed using the l probable maximum hurricane (PMH) as reported by the U.S. National

] Oceanic and Atmospheric Administration (NOAA) in their unpublished

report HUR 7-97. NUR 7-97 describes the PHH as " ...a hypothetical l hurricane having that combination of characteristics which will make

it the most severe that can probably occur in the particular region

! involved." The characteristics of the PMN used in computing the maximum surge levels were:

1. Central pressure index = 69.24 cm (27.26 inches) i 2. Radius of maximum wind = 88.9 km (4B nautical miles) i 3. Forward speed = 27.8 km/hr (15 knots)

! 4. Maximum gradient wind = 198.4 km/hr (124 miles per hour) ,

5. Peripheral pressure = 77.62 cm (30.56 inches) l The locus of maximum vinds of the PMH was brought inshore along a l 1 track which passes just to the east of the eastern and of Long j 1sland. This calculated maximum surge height is elevation +6 meters j j (+19.70 feet) mal. The total surge includes 0.73 meter (2.40 feet) '

i of astronomical tide, 0.30 meter (1 foot) of forerunner or initial l rise, 0.72 meter (2.36 feet) of rise due to barometric pressure drop.

j and 4.25 meters (13.93 feet) of wind setup.

ii

• Nave action during the PMH was also considered. Millstone Point is

sheltered from the direct onslaught of open ocean waves by Long l 2.4-3

3D178-3 EROLS Island. Moreover, the station is located on the western side of the

Point and a considerable distance inland from the southernmost tip.

l Thus, the topography of the point itself protects the station area l

from breaking waves during the period of peak tidal flooding when the l 1

winds are from the southeast quadrant. By the time the winds back i around to the southwest quadrant, the direction of maximan station

} exposure, the surge level will be below elevation 2.5 meters

. (8.2 feet) as1, and the winds will have subsided considerably.

t

• i The design basis flood (maximum combination of storm surge and wave i runup) established for Millstone 3 is elevation +7.25 meters ,

i (+23.8 feet) as1. With the exception of the circulating and service  !

{ -

water pumphouse, all safety related structures and equipment are  !

i protected from flooding by the Millstone 3 site grade of elevation l +7.32 maters'(+24 feet) as1. Each of the two pairs of service water l pumps and pump motors is located at elevation 4.42 meters

! (+14.5 feet) asl inside individual watertight cubicles of the

!. seismically designed pump house. The walls of these cubicles are i vatertight up to elevation 7.77 meters (+25.5 feet) as1, protecting -

the pump motors and associated electrical equipment from wave action

} and PMN surge.

i j 2.4.3.3 Tidal current i

To understand the hydrographic and hydrothermal charactericistics of j

j the water bodies in the vicinity of the site, Northeast Utilities 5ervice Company (NUSCo.) has retained several different investigators "

)'

i to perform hydrographic surveys since 1965. The hydrographic survey

conducted in late summer of 1965 established baseline data in the

! vicinity of the site, including tidal current velocities and volume i

flow measurements (Docket No. 50-245 Unit 1 Environmental Report, Appendix 3, section 111-3). The survey station locations are shown on Figure 2.4-4. l

! The tidal current velocities and volume flow survey (results shown on

Tigure 2.4-5) employed one continuous monitoring current meter .

l located at the index station and a portable current meter, which was i operated at each station successively, approximately once per hour i for one tidal cycle. Readings were made with the portable meter at i depths of 1.5 meters (5 feet), half way to bottom and 1.5 meters j (5 feet) off bottom.

f There was an apparent negative gradient of current volteity from the i surface toward the bottom. In terms of maximum abb velocity, at

! Station one the mid-depth velocity was 74 percent of the surface j velocity, and the bottom velocity was 61 percent of surface velocity.

, comparable figures for Station Two were 66 and 60 percent, 4

respectively. At Station Three it was 85 and 62 percent, i respectively. At Station Tour it was 85 and 65 percent, j respectively. This velocity gradient would produce considerable j vertical mixing in the water flow and would be a factor in the j thorough distribution of the water column.

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! 2.4-4 i

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, MNPS-3 EROL5 l

] 'The results from the continuous recording meter located at the indez station conformed in general with those from the portable meter. In

addition, they -indicated an asymmetry between the flood and ebb

{ tides, with the flood tide achieving a peak welocity of l 0.53 meters /sec (1.75 ft/sec) and the abb tide reaching a peak j velocity of 0.45 meters /sec (1.48 ft/sec).

l l Bottom profiles (Figure 2.4-6) were run from Station One through i station Two to the ahoreline, and from Station Four through Station

{ Three to the shoreline, with a continuous recording fathometer. The i bottom profiles were divided into an appropriate number of trapezoids I whose areas were calculated and summed to arrive at total cross sectional area. Using a mean velocity of 0.26 meters /sec j (0.857 ft/sec) for the tidal cycle beginning one hour before low t slack water on September 2, 1965, it vss calculated that a mean tidal j flow of 3,576 cubic meters /sec (126,247 cis) in Twotree Island i Channel and 2,243 cubic meters /sec (79,186 cis) across the section l i running from sell 4 northeast towards the shore will occur. The flow i across the Twotree Island Channel is in close agreement with a  !

! preliminary estimate of 3,398 cubic meters /sec (120,000 cis) based on l available USC&Gs data (Docket Ne. 50-245 Unit 1 Environmental Report )

i Appendix B, Section III-A).

j 2he hydrographic survey conducted in February 1974 (Figure 2.4-7) was l for the purpose of collecting tidal and current data. These data  ;

\ were then used to calibrate a two-dimensional hydrodynamic model J which was used to simulate flow patterns at the Millstone site (NUSCo. 1975).

t l Figure 2.4-8 shows the modeling area. A grid size of 305 meters by j 305 meters (1.000 feet by 1,000 feet) was selected. The solid line i defines the closed boundary which was chosen to closely approximate l the shoreline geometry from Black Point to seaside Point. The' dashed j line defines the open boundary which extends through the open water of Long Island sound.

' Description of the model, input parameters, and model* verification can be found in NUsCo.'s Swamary Report (1975). The model results

, are shown on Figures 2.4-9 through 2.4-12. Each figure represents a synoptic picture of the tidal eurrent speed and direction at all cells within the model. Times have been selected that represent the tidal current stages of strength of flood high slack water, strength 3

of abb, and low slack water. The reference point for time is the

lower right cell.

} The strength of flood on Figure 2.4-9 shows a general westward circulation with maximan velocities of 0.61 meters /sec (2 fps) in the j Twotree Island channel. The high slack stage occurs approximately l

0.52 hour6.018519e-4 days <br />0.0144 hours <br />8.597884e-5 weeks <br />1.9786e-5 months <br /> after high tide. Figure 2.4-10 illustrates the low

velocities and mixed directions characterizing this period of tide j reversal. The tidal current stage of the Niantic River estuary legs j .

in time and still shows a moderate flooding current.

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2.4-5 l

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. 30tPS-3 EROL5 i

The strength of ebb develops about 4.05 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> after high tide. The flow from west to east appears on Figure 2.4-11. Finally, on

)

Figure 2.4-12, low slack water occurs and a general mixed flow pattern precedes a reversal of direction. The tidal current stage of the Niantic River still legs the outer bay and shows an ebbing flow.

The general flow patterns are'similar to those abserved in past field surveys. They also indicate two phenomena recently noted in the i

j summer of 1973 survey data. First, there are no completely slack water conditions between the flood and ebb tides, a characteristic of rotary tide currents. Second, the time of lowest velocity does not always coincide with the high and low tide, as is observed in other bays along open coastlines, but a lag of from 1/2 to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> usually j occurs. i

2.4.3.4 Water Quality s

) A 1-year, intensive water quality monitoring program was conducted j during 1974 by The Research Corporation of New England, Inc. (TRC).

These data supplement a large information base established during the l l routine' biological monitoring conducted by Cispp Laboratories since i

{

1968. The objectives were to establish the baseline chemical

• l j composition of Long 1sisnd Sound waters and bottom sediments adjacent j l to Millstone Point and to detect any changes in these chemical '

] constituents resulting from the discharge of the Millstone station.  !

l The locations of the water quality and benthic sampling stations are i j presented on Figure 2.4-13. Monthly water samples were collected at ./

j all stations on both abb and flood tides. At sampling stations

within the influence of the Millstone I thermal plume, samples were )

collected at 0.3 meter (1 foot) below the surface, mid-depth, and j 0.3 meter (1 foot) above the bottom.'

S The sampling itinerary was coordinated so that stations within the j influence of the thermal plume on flood tide (stations 4 and 8) were

( sampled at the strength of flood tide. Station 3, within the

! influence of the thermal plume on both abb and flood sisek, was l sampled at abb and flood slack.

! Average concentrations of parameters analyzed on a monthly and

! quarterly schedule are presented in Tables 2.4-2 and 2.4-3, j respectively. Those parameters sampled quarterly were expected to show little or no seasonal fluctuation.

2.4.3.4.1 Major Seawater Constituents

} The seawater constituents discussed in this section are present in

] ocean water in concentrations greater than approximately 140 mg/l j (Martin 1970). The concentrations of these constituents are j relatively constant for all ocean water. The total alkalinity and j calcium concentration remained relatively constant throughout 1974.

t The alkalinity in Long Island sound, approximately 230 mg/l as j calcium carbonate or 5 x 10-s M, is higher than values reported for e

the open ocean of 2.5 x 10-s M (Martin 1970) or 139.7 ag/l (Sverdrup

{ et al 1942).

i j 2.4-6

' ** j l -

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- HNPS-3 EROL5 l 1 .

j the calcium concentrations of approximately 245 mg/l recorded in Long j Island sound during 1974 are lower than reported values of 400 mg/l

} (Sverdrup et al 1942) and 413 ag/l (Martin 1970).

i the concentrations of potassium in eastern Long Island sound ranged p between 500 and 650 mg/l during the 1974 sagling program. This is J bigher than the values of 390 mg/l (Harvey 1955) and 380 mg/l i

(Sverdrup et al 1942) reported for the open ocean.

Magnesium concentrations of 1,270 mg/l ('Sverdsp ot al 1942),

- 1,294 mg/l (Martin 1970), and 1,330 mg/l (Marvey 1955) have been

, reported for ocean water. Seasonal fluctuations of magnesium were

. . reported during this program. Lowest ranges were recorded during the spring runoff in March (775 to 825 mg/1). The . range of June l concentrations between sampling stations was 960 to 1,805 mg/1, this l wide fluctuation resulted from the analytical laboratory techniques j and followed no apparent pattern. september values ranged from 1,050

to 1,170 mg/1.

) 2.4.3.4.2 Nutrients i

l Nitrogen , )

! i

! Riley (1959) reports that nitrogen is the limiting nutrient for  !

l phytoplankton growth in Long Island sound. He found that ammonia is i h = = ara 5=portant nitrogen source than nitrate during most of the i

y season of active phytoplankton growth. Winter maximum concentrations

! of 3.0 vg-atoms Po4-P/1 (0.09 mg/1) and 16.0 Wg-atoms NO3-N/1 (0.22

mg/1) were reported. A major phytoplankton bloom occurs in winter,

! culminating in March, with a second bloom in May and June in the l eastern end of Long Island sound. Harris (1959) reports ammonia

! concentration of 5 Wg-atoms NH3-N/1 (0.07 ag/1) after nitrate i depletion in March. The winter bloom exhausts inorganic nutrients in i the eastern and of the Sound slowly between December and March. The j eastern end of the sound had a small but noticeable nitrate increase j in April.

I Nutrient determinations made over an annual cycle in the Niantic

! River shoals by Marshall (1967) show a seasonal range of phosphate

! from less than 0.2 to 1.5 Wl/l (0.018 to 0.142 mg/1) and a seasonal j range of nitrate from 0.2 to 5.5uM/1 (0.012 to 0.247 ag/1). Marshall j (1967) reported an early spring bloom in the estuary and a summer j maximum in Niantic Bay.

! The data reported during the 1974 sampling program suggest that i

nitrate concentrations have either reached the midwinter maximum or i

are in the depletion stage of the midwinter phytoplankton bloom on i the sampling date in January (Table 2.4-2). The magnitude of nitrate j concentrations at that time (approximately 0.7 ag/l = 11.4 ug-atoms

' NO3-N/1) is less than the average recorded mid-winter maximum of

15-20 vg-atoms N/1 (Riley 1959), but within a 1954 maximum of

! approximately 9 ug atoms NO3-N/1 (Harris 1959). Nitrate is not

{ depleted rapidly but decreases gradually over at least 4 weeks to l

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1' 2.4-7 N

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MNPS-3 EAOLS 1

1evels below 0.1 mg/l (1.6 g-atoms NO3-M/1) in late March to l

mid-April. ]'

! Nitrate concentration remains in a depleted condition until May when j concentrations at all stations increase markedly. These phenomena, j caused by increased freshwater input from the connecticut River, have

! been reported to occur in April (Riley 1959).

l l Nitrate is rapidly depleted (<4 weeks) to very low levels from mid-May to mid-June, suggesting a spring phytoplankton bloom in

! nearshore areas in eastern Long Island sound. This bloom in the eastern Sound has been reported by Riley (1959). The low nitrate j

l concentrations recorded during June continued through the November j sampling period. No gradual fall increase in nitrate was detected.

i However, concentrations did begin to increase from the November to

December period.

i i Ammonia nitrogen concentrations are low during the winter bloom l period, in the range of 0 to 0.04 mg/l (o to 2.3 ug atoms /1). In j May, almost all stations recorded less than 0.01 mg/l (0.6 vg atoms /1). Ammonia concentrations increased during June when nitrate concentration is depleted. Lowest . salinities were recorded in May l hence, the ammonia maximum does not appear to be the result of .

i freshwater drainage. Jordan cove and the Niantic River on the ebb l tide contained twice the concentration of ammonia recorded at any

other stations during this June period. t f

The June increase is probably due to zooplanktion excretion of ammonia J

and bacterial decomposition of phytoplankton on the ocean bottom.

concentrations remained elevated through July. Ammonia

! concentrations decreased to nondetectable limits in August at all l stations except The Niantic River mouth, where ammonia concentrations j are high (0.18 to 0.3 mg/1) on both tidal cycles. Summer bloom may j account for this ammonia deplet:.on in August. The high concentration l of ammonia in the Niantic Rher suggests that active bacterial j decomposition processes may Da occurring in the Niantic estuary i

during these periods.

Ammonia concentrations from September through December fluctuate randomly. Many station cone,antrations are below the limits where

nutrients are considered exhausted, yet other stations achieve

! concentrations as high as those recorded during the June to July i maximum. Sampling stations in the vicinity of the generating station 4 . appear to be slightly annonia-rich during these september to December d months. Some depletion of the NHs occurs during this period, but not to the low levels recorded in February, May, and August.

A nitrite-nitrogen maximum of 7 pg/l in October has been previously

reported (Harris 1959). This period is the only one during the year

! when nitrification (the complete oxidation of ammonia to nitrite, I then nitrate) occurs in the sound. Concentrations around Millstone j Point in September are in the 7 vg/l ranger however, peak $

! concentrations of 40 to 80 vg/l were recorded in october. A W i

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I MNPS-3 ER0L5 1

relatively high Septunber annonia concentration of 0.1 mg/l may

}e l

account for the higher October nitrite concentrations.

i Little fluctuation in the concentrations of organic nitrogen is 3

apparent. Typical concentrations throughout the year are in the range of 0.2 to 0.3 mg/l (14 to 21 vs atoms N/1) during previnter i

bloom and winter bloom periods and 0.3 to 0.4 mg/l (21 to 25 ug atoms j N/1) from May to September. Since the majority of these samples were j taken at surface or mid-depth, this data can be compared to the

previous data of Harris (1959) who reported a total of 9 vg atoms N/1 l

in the winter,16 vg atoms /1 after the early spring bloom, and 6 vg -

atoms /1 in May.

l Phosphorus

~

i Nardy (1971) repor'ts that minimum phosphate values in Long Island i sound were recorded in the eastern end, where values of 0.4 M/1 were j detected in April. Generally, phosphate is higher in Long Island -

l Sound at the surface due to high-phosphorus-containing sewage e

effluents being discharged by the connecticut River and the Thames 2 River. However, no vertical distribution of phosphate was apparent i

in eastern Long Island sound. In August, Hardy (1970) detected 0.6

WM P04-7/1. Phosphate in surface drainage to Long Island Sound, was generally less than or equal to phosphate levels in the sound.

l Maximum phosphate concentrations occurred soon after summer ,

2 stratification breakdown in the fall. An EPA cruise (1971) reported l 0.03 mg/l PO4-P/1 at The Race in September 1969, and a range of C.03 i

to 0.06 ag/l total PO4-P in July 1970, between Goshen Point and Giants Neck. Niantic Bay contained 0.03 mg/1 Jordan Cove contained

0.04 mg/1.

Deth total and orthophosphate concentrations are low in January, l

building up to the winter maximum in late February. The maximum j phosphate concentration of 0.2 ag/l (2 vg-atoms F/1) is higher than j

the maximum reported by Riley (1959) during pre-phytoplankton bloom i conditions. Previous studies (Riley 1959) report thatDuring phosphate 1974, l

decreased gradually to a minimm value in April.

phosphate decreased within 4 weeks to nondetectable levels in March at all stations. Phosphate concentrations built up to 0.1 mg/l at all stations by June. The May to June nitrate depletion has no effect on the phosphate concentration. Phosphate depletion in July i

1 occurs at some stations, but levels of 0.1 ag/l are generally I

maintained throughout the remainder of the sampling year.

Organic carbon. Oil and Grease, 30D An EPA cruise (1971) recorded 2 ag/l of Total organic carbon (Toc)-

and 0.6 mg/l of Biochemical Oxygen Demand (BOD) in September l October 1969 at the Race. In July 1970, they recorded TOC values in i

l the range of 1 to 3 ag/l from Goshen Point to Giant's Neck. No 30D was detectable. BOD concentrations recorded during this study are in i azeess of 3.0 mg/l j ".) the range of 0 to 2 mg/l with concentrations in The amount of biodegradable

.# occurring during June and November.

organic material in the water appears to be constant and not a l

2.4-9

7 l

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MNPS-3 EROLS f

function of the soluble organic carbon or oil and grease ]

! concentrations. Soluble organic carbon values generally range from o

to 10 mg/1r however, values of 20 to 30 mg/l were common at isolated l stations and values as high as 50 to 100 mg/l were reported. No i fluctuation in 300 with increased organic carbon concentrations is

apparent, indicating that the major portion of the organic material i in samples having high concentrations of organic carbon is

non-biodegradable. Oil and grease concentrations in the water column

ahow a markedly higher concentration during the months of January to i

April 12.02 (3to30mg/1)thandyberesseing mg/1). This sumer - the maymonths

,be due of to July-October an increase in(0.06 to i biological activity which follows increased water temperatures. This l

increased biological activity may hasten the breakdown of oil and l

grease. It is interesting to note that no stratification of oil and grease is apparent in the water coltuun. Oil and grease is probably

! adsorbed on the surfaces of suspended particles. The low l

concentrations of oil and grease continue into November, when biological activity should decrease due to decreased temperature. No correlation is apparent between oil and grease and 70c l

- concentrations, de to the apparent absorption of oil and grease onto

! suspended particles. organic carbon associated with suspended l particles was not measured. *

/

2.4.3.4.3 Trace Metals An ongoing monitoring program was established by WUsco. to determine g potential impacts of the Millstone Nuclear Power station on trace j metal concentrations in Long Island sound. The parameters selected for study includes copper, sinc, iron, chromium, and lead. The j results of this program through the 1980 (NUSCo. 1981) sampling l

period are presented in this section. Samples were collected from i four locations in the vicinity of the station: Millstone 1 intakes i Quarry cut (station discharge): Giants Necks and Twotree Island.

I Hean trace metal concentrations at these locations from 1973-1980 are i

presented in Table 2.4-5. Monthly average trace metal concentrations

measured during the 1974 baseline study are presented in Table 2.4-4.

h

coppper i

Mean total copper concentrations at the fm.r sampling locations

! generally decreased from 1973 through 1980, with the lowest mean concentrations at all stations recorded during the 1980 period. Mean j concentrations ranged form 1.7 ppb (Twotree Island, 1980) to 18 ppb (Quarry cut, 1973). The average concentration of total copper for all stations from 1973-1980 was 6.1 ppb, with averages ranging from 2.2 ppb in 1980 to la ppb in 1973 (all stations averaged).

In the 1974 baseline study, soluble copper determinations were conducted from July through December. The detected concentrations j never exceeded 5 ppb. Concentrations detected at the station j discharge (Quarry cut) exceeded those recorded at other stations only l

in November on ebb tide. The concentration of souble copper at the discharge at that time was 3 ppb. .

l 2.4-10 4

1 .:.

l', MNP3-3 EROLS I ,

Eine l

l The mean concentrations of total sine ranged 3 6m 2.4 ppb (Quarry

! Cut,1980) to 22 ppb (Twotree Island, 1973). The lowest mean

concentrations for all stations were recorded in 1980. The average j concentration of total sine for the 1973-1980 period was 10.2 ppb.

. The annual average concentrations ranged form 3.0 ppb in 1980 to l 16.1 ppb in 1976.

I

• i The monthly average total sine concentration on ebb and flood tide i during the 1974 baseline study is presented in Table 2.4-4. Total l 5

! sinc concentrations have. seasonal fluctuations, with average t concentrations ranging from 3 to 12 ppb between January and April.

During the May runoff period, average concentrations reached 35 to 45 ppb. After a decline to 6 to 7 ppb in June, total. stac concentrations increased to 25 to 26 ppb in July. Concentrations i decreased to 4 to 5 ppb in August and then gradually increased from l August to December to 15 to 21 ppb.

i

• Iron i

. Mean annual concentrations of total tron fluctuated randomly between I 1973 and 1980, with annual mean concentrations ranging from 59 ppb l (Quarry Cut, 1975) to 856; ppb (Giants Neck, 1977). Annual average

concentrations (all stations) ranged from 67 ppb in 1975 to 327 ppb l in 1977. The average concentration of total tron for the entire 1973-1980 period was 156 ppb.

. During the 1974 baseline study, the range of average total iron concentrations between January and May was 100 to 200 ppb, and j between June and December the range decreased to less than 100 ppb.

An exception to the low range of concentrations recorded from June through December was recorded in September when many stations i recorded between 100 and 200 ppb total tron, and concentrations

! greater than 200 ppb were recorded at five locations.

4 i

Chromium

- Mean annual concentrations of total chromium reported during the l

1973-1980 study period never exceeded 2 ppb for all stations

! monitored. Clapp Laboratories (NUSCo. 1973) reported no total i chromium concentrations in eastern Long Island Sound which were greater than 5 ppb on six sampling dates between February 1973 and February 1974. Soluble chromium concentrations reported by Clapp Labroatories never asceeded 1 ppb. During the 1974 baseline study, soluble chromium concentrations were measured from July through December and never exceeded 1 ppb at all stations in all samples.

Lead Mean annual concentrations of total lead ranged from less than 1 ppb (Millstone antake, 1980) to 8.4 ppb (Twotree Island, 1976) during the 8 1973-1980 period. The lowest mean concentrations for all stations Amendment 5 2.4-11 January 1984

MNPs-3 EROLs l

i were reported in 1980. Average annual concentrations ranged from less than 1.2 ppb in 1980 to 5.3 ppb in 1976. )

i clapp Laboratories (NUSCo. 1973) reported total head concentrations

in excess of 5 ppb in 5 of 24 samples collected between February 1973

and February 1974. The maximum total lead concentration detected was

15 ppb, of which 14 ppb were insoluble land. During the 1974  ;

i baseline study, soluble lead concentrations were less than 2 ppb at all stations between June and Deceabar.

I Aluminum ,

i l The co'n centration of total aluminum recorded during 1974 ranged from '

1ess than 0.2 ag/l to 3.7 ag/1. Maximum everage almine

• concentrations occur.during July when concentrations on ebb and flood

^

tide are 3.7 and 2.3 mg/1, respectively. Miniziam aluminum

! concentrations of less than 0.2 mg/l were reported in October, which  :

! is the high salinity period when there is minimum dilution of high j salinity water . entering eastern Long Island sound through The Race l from Block Island sound. Runoff may be a major source of aluminum i input into eastern Long Island sound. ,

Manganese l

l The totai manganese concentrations measured during the 1974 study l l have seasonal fluctuations. The maximum everage concentrations (37 i to 45 ug/1) are recorded during the spring runoff period of March and i April. Since the manganese concentrations include metal associated 1

1 l l with suspended matter, the spring runoff period probably contributes

! manganese to eastern Long Island sound. Manganese concentrations

, generally decrease from June to December with December concentrations below 5 99/1.

! Nickel i

j The concentrations represent total' nickel. Monthly average total i nickel concentrations on ebb and flood tide are presented in Table'2.4-4. The range of average concentrations of nickel was i between 75 and 170 vg/l between January and July, except for a March

maximum of approximately 240 vg/1. The March yearly maximum occurs

! when runoff conditions may contribute particulate nickel to the water column. A decrease in the magnitude of nickel concentration occurred j in August when concentrations averaged approximately 21 vg/1. A

september increase to approximately 45 ug/l is followed by a decrease i to less than 5 vg/l in December.

I I Arsenic i A range of arsenic concentrations in sea water of 9 to 22 ug/l has i been reported by Rakestraw and Lutz (1933). Other seawater values

reported include 2 pg/l in the ocean (Preston 1972), 1.12 to

) 1.71 v3/1 in Japan (chemical Abstracts 1977), and 5.6 vg/l in the (

j Atlantic ocean (chemical Abstracts 1977).

1 l

, 2.4-12

i totPS-3 EROLS J

j .

j

) No arsenic was detected during the 1974 sampling program. However, the detection Mait of the analytical methods used to measure arsenic j was above the concentrations reported by previous investigators.

i j Molybdemsa i

! The detection limit of the' analytical methods used to measure

molybdenum during the 1974 baseline study was 15 vg/1. The range of j molybdenum concentrations recorded is from 150 to 600 vg/l in March

and 38 to 56 vg/l in september. Recorded June concentrations are as high as 1 ag/1. No molybdenum was detected in December. & major portion of the molybdenum present in the water column appears to be associated with suspended matter. In June, higher concentrations of

! molybdenum were detected at the station discharge than at other j locations in the area.

i Titanium

. Concentrations of 0.0 to 17.88 vg/l of titanium in the northeast Atlantic Ocean in sea water suspended matter (Blashis 1971), and 1 vg/l in the open ocean (Preston 9t al 1972) have been reported.

The detection limit for titanium during the 1974 sampling program was 150 vg/l which is above the concentrations reported by previous

) authors. No titanium was detected in the water column except in i December, when four stations recorded a range of 150 to 320 vg/1.

i Titanium was not detected at the discharge of Millstone tower station.

Cadmium l Dehlinger et al (1973) reports cadmium concentrations in eastern Long j Island Sound of 0.1 vg/1. He reports that these concentrations agree i with those obtained for nearshore waters by other investigators and that large concentrations of cadmium are not associated with the acid leachable material or strong chelating substances. In eastern Long i

Island sound, spring of 1972, he reported a range of cadmium I concentrations of 0.16 to 2.7 vg/1. ,

! During the 1974 study, soluble cadmium determinations were conducted j in september and December, and detectable concentrations (>l ug/1) were reported in only 9 of 44 samples. The station discharge never l2 i

contained more than 1 vg/1.

j Beryllium ,

1 l Beryllium concentrations of 0.35 and 0.03 ug/l in the sea of Japan

{

(chemical Abstracts 1951a) and 0.005 vg/l in the open ocean (Preston j et al 1972) have been reported. No beryllium was detected during the j 1974 sampling program. The detection limit of the analytical method used was 50 vg/1.

Amendment 2 2.4-13 April 1953 i .

- 30tPS-3 ER0LS Mercury )

l l Concentrations Of 0.013 to 0.018 vg/l of mercury in the northeast Atlantic Ocean (Chemical Abstracts 1951b) and 0.4 to 2 vg/l in the Atlantic Ocean (Chemical Abstracts 1959) have been reported.

l Dehlinger et al (1973) reports 0.045 to 0.078 vg/l in eastern Long l Island Sound in October of 1972. No mercury was detected during the 1974 sampling program. The detection limit for the mercury analysis

- was 2 pg/1.

l Th

- Smith (1971) reports 2.25 g/l tin in the open ocean. Difficulties in tin analysis resulted in unreliable March determinations during the 1974 study. Frps June to December, tin was detected in only one sample. The detection limit for tin was 200 vg/1.

Phenol Alekserva (1972) reports 0.02 to %08 ag/l in the open ocean. Phenol was detectable at' only four campling stations throughout 1974.

! Concentrations do not exceed 9 vg/1. No phenol was detected at the station discharge during the 1974 study period.

2.4.3.4.4. Physical Parat % rs and Dissolved Gases Salinity )

Clapp Laboratories (NUSCo. 1973) has collected salinity data around Millstone Point. Seasonal maxima occur from September to November, l

l

. peaking at greater than 31 ppt.' seasonal minima usually occur

' between March and May, generally at 27 to 28 ppt. Jordan Cove salinities are consistently lower than levels recorded in the rest of the Millstone Point area in the May-July period. Values in the range of 25 to 26 ppt were recorded at these times. Average salinities in the ares were in the range of 28 to 30 ppt. .

Lowest salinities (26 to 28 ppt) recorded by TRC during the 1974 baseline study were recorded in the March-May spring runoff period on both tidal conditions. Jordan Cove and Niantic River salinities are lower than at other stations around Millstone Point during the March-May period, because these water bodies are sources of freshwater input to Niantic Bay.

Salinities gradually increased after May, peaking at 31 to 32 ppt in late september, and decreasing thereafter to a concentration in December similar to that recorded the previous January. The average salinity was in the range of 24 to 30 ppt.

i l

Salinities reported in 1980 as part of the ongoing monitoring program l ranged from 24.9 ppt (Giants Neck) in May to 33.0 ppt (Twotree Island) in September. The lowest salinities for all four sampling }

l locations were recorded in May (27.6 ppt average of all stations).

l 2.4-14

l ,

{' *t . .

i

!*- MNPS-3 EROLS i

l The highest salinities at each station were recorded in september i

2 (12.7 ppt average of all stations).

Dissolved oxygen s

Monthly fluctuation of oxygen saturation was recorded during the 1974 study on beeth high and low tidal stages. Maximum saturation was i recorded at ambient stations outside of the influence of the thermal j discharge during January (approximately 120-percent saturation), June through July (110 percent saturation), and November (105 to 110 percent saturation). Minimum saturation was recorded during

! October (75 to 84 percent saturation). The lowest concentrations recorded were between 5.7 and 6.0 mg/l on flood tide at the quarry l set and in the Niantic River.

j .

RE h

! Portions of the pH data collected during the early months of 1974 l were not considered valid due to malfunction of the pH monitoring i instrumentation. Accordingly, only scanty pH data are available from i the January to May period. Complete data were collected between June l and December. .

?

l The pH range recorded during the majority of the 1974 sampling year was between 7.5 and 7.7. Values greater than a pH of 8 were reported i h *=rine march, octaber thraush wav==bar, and 3=2r == the r2=oa tid =-  :

j F The pH range of 7.5 to 7.7 is low compared to values of 8.1 to 8.3, i reported for the open ocean at the surface (Sverdrup 1942). The i range 7.5 to 7.7, however, has been reported by previous researches

in the Millstone area (NUSCo. 1973) during most of the year. The

' generally lower pH range may be due to the dilution effect of the freshwater input to eastern 1,ong Island sound.

Values of pH reported in 1980 as part of the ongoing monitoring program ranged from 7.2 (Quarry cut, July) to 8.0 at Twotree Island, i Millstone 1 Intake, and the Quarry Cut in May. A pH value of 8.0 was also recorded at the Giants

• Neck sampling station in December.

suspended solids l

l Suspended solids concentrations reported during the 1974 baseline j study are similar throughout the year. Twenty to 35 mg/l is the i typical concentration range for suspended solids for most stations.

1 Station 3 (see Figure 2.4 4) consistently records higher suspended

! solids concentrations than other stations throughout the year, 2 especially at 0.3 meter (1 foot) above the bottom. At other stations i where samples were taken at different depths, little stratification j of suspended solids concentration was noted. station 4, however, displayed consistently lower suspended solids concentrations.

i 2.4.4 References for section 2.4 F &lekserva 1972. Tr. Go. okeanogr. Inst. No. 113, p 60-65.

i] -

! 2.4-15 i

L_-__--___-_-

l

~

i . MRPS-3 ER0L5 4

Sechtel Corporation 1969. Subsurface, Geophysical, and Groundwater

• Investigations at Millstone Nuclear Power station Unit 2. In:

Preliminary Safety Analysis Report, Millstone Nuclear Power Station l

Unit 2, Appendix 23, p 28-1 to 25-3, Figures 25-1 to 23-4 and APPendia 28 - Amen &nent No.1, p 1-12, Tables I and II, Plates 1-7, Graphic Boring Logs 101-114.

31ashis, I.E. 1971. Okeanologuga, 11(16):1116.

Chemical Abstracts 1951a: 4779.

.i Chemical Abstracts 1951b: 67237.

1 I, chemical Abstracts 1959: 72625.

i Chemical Abstracts 1977: 99418.

Dehlinger, P.: Fitzgerald, W.F.: Feng, 5.Y.: Paskausky, D.F.:

Garvine, R.W.: and Sohlen, W.F. 1973. A Determination of Sudgets of l Heavy Metal Wastes in Long Island Sound. First Annual Report, Univ.

1 of Conn. Marbe sciences Institute, Avery Point (Groton), Conn.

ERASCO Servicis Inc. 1966. Geology 'and Seismology.- In: Unit Design 1

Analysis Report. Millstone Nuclear Power Station 1,

! i Section 5.0, p 11-5-1 to 11-5-6.

Environmental Protection Agency (EPA) 1971. Report on the Water Quality of Long Island Sound. Water Quality Office, New England l

Region CWT 10-29.

Hardy, C.D. 1970. Hydrographic Data Report: Long Island Sound, Tech l Report No. 4, Marine Sciences Research Center, State University of l

1 New York, Stony Brook, N.Y.

l Hardy, C.D. 1971. Movement and Quality of Long Island Sound Waters.

l Tech Rep No.17, Marine Sciences Research Center, State University of l New York, Stony Brook, N.Y.

j n

Harris, D.L. 1963. Characteristics of the Hurricane Storm surge.

U.S. Weather Bureau, Technical Paper No. 48.

I j Harris, E. 1959. The Nitrogen Cycle in Long Island sound. Sulletin j Bingham oceanogr. Coll. vol 17, p 31-63.

3 Marvey, H.W. 1955. Chemistry and Fertility of Sea Water. Cambridge j

University Press, Cambridge, England.

1 Marshall, N. 1g67. Some Characteristics of the Epibenthic Environment of Tidal Shoals. Ches. Sci. Vol 8, No. 3, p 155-169.

i Marine Chemistry. Marcel Dekker Inc., New York,

) Martin, D. 1970.  ;

j N.Y. .

i 1

4 2.4-16

't+

z r .

MMPS-3 ERDLE i

a l New England Corps. of Engineers 1965. New London Hurricane Barrier.

. Murricane Protection Project Design, Memorandum No. 1.

l 4 Northeast Utilities Service Company (NUSCo.) 1973. Semi-Annual Report, April 1,1973 through September 30, 1973. Ecological and Mydrographic Studies. Millstone Nuclear Power Station, Berlin, Conn.

{

j Northeast Utilities Service Company (NUSCo.) 1975. Summary Report

Ecological and Hydrographic Studies May 1966 through December 1974,

! Waterford, Conn. .

' Northeast Utilities Service Company (NUSCo.) 1981. Monitoring the

Marine Environment of Long Island Sound at Millstone Nuclear Power

! stations Waterford, Conn.

! Preston, A.: Jeffries, D.: Dutton, J.: Harvey, B.: and Steele, A.

I 1972.  ?!cI Mseline Study, Brookhaven National Laboratories, Brookhaven N.'r.

Rakestraw, N. and Lutz, F. 1933. Biological Bulletin Woods Hole, Vol 65, p 397-401.

Redfield, A.C. and Miller, A.R. 1957. Water Levels Accompanying Atlantic Coast Hurricanes. Meteorological Monographs, Vol. 2, No. 10, American Meteorological Society, Boston, Mass.

Riley, G.A. 1959. Oceanography of Long Island Sound. Bulletin Singham oceanogr. Coll. 17(1), p 9-31. j Smith, J. J. 1971. Electroanal. Chem. Interfacial Electrochem.

3(1): p 169-175. .

l Spencer, D.W.: and Brewer, P.O. 1969. The Distribution of Copper, Zine and Nickel in Sea Water of the Gulf of Maine and the Sargasso sea. Geochemical Cosmochimica Acta, Vol 33, p 325-sverdrup, M.: Johnson, M.: and Fleming, R. 1942. Oceans. Prentice-Hall, Inc. Englewood Cliffs, N.J.

W .

3.4-17

. - - ~ ~

j CONTA'INMENT

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• 30tPS-3 EROLS

) TABLE 2.4-3 I

BASELINE NATER QUALITY DATA - LONG ISLAND SOUND ** l

, QUARTERLY SAMPLING l

. \

j Parameter

• Narch June September December l

Total alkalinity 230 237 236 257

! Chloride ,17,182' 17,045 17,955 18,352 )

i * '

Potassium 577 588 496 636 i ~

! calcina 263 259 234 232 I l

i Nagnesim 781 1,441 1,120 852 1

l Arsenic ND ND ND ND 1

i Nolybdenum 0.33 (0.5*** 0.045 ND i

, Titanium WD ND ND <0.19***

4 I

l Vanadium 0.16 (0.16*** 0.016 ND l Ca6mium 0.03 0.05 <.013*** ND i

Berylium ND ND ND ND l

l Nercury ND ND ND ND 1

l Total solids 33,203 35,418 33,742 33,510 l

volatile solids 5,810 7,732 7,217 5,109 Tin 11.0 ND <0.3*** ND 3

i l Phenol ND*** ND <0.003*** ND J

l NOTES:

!

• All concentrations are supressed in ag/1.

l

• • Based on data collected during the 1974 water quality monitoring program i

• • • For those parameters where one or more reported values were below 1

detection limits, concentrations shown are averages of values

}

1. greater than these limits.

.! ND - Not detectable i 1 of 1 J

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helt.LSTOf1E IOUCLEAR POWER STATION UNIT 3 ENVIRONRIENTAL REPORT-OPERATING LICENSE STAGE i

=

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. NNPS-3 EROLS i

TABLE 2.4-4 l HONTMLY AVERhGE TOTAL METAL CONCENTRATION

• i l (Unfiltered samples)

Parameter (ag/1)

Month Tide Iron Manganese Nickel Zine Aluminua

!* Jan Ebb Flood 0.16 0.03 0.104 0.009 1.01

, 0.16 0.01 0.069 0.011 1.34 l 1

Feb Ebb 0.08 0.083 0.003 0.6 I

0.017 j Flood 0.09 0.021 0.075 0.004 0.7 Mar Db 0.14 0.043 0.24 0.012 1.2 I i Flood 0.14 '0.045 0.25 0.009 1.4 l

! i j Apr Ob 0.13 0.037 0.11 0.011 1.2 j l Flood 0.11 0.039 0.13 0.008 0.9 f .

.;' May Ebb 0.14 0.03 0.16 0.045 0.64 Flood 0.14 0.02 0.17 0.035 1.00 i

! June hb 0.08 0.026 0.12 0.007 0.28 l Flood 0.08 0.031 0.11 0.006 0.29 '

i

{ July hb 0.09 0.03 0.09 0.026 3.7 j Flood 0.08 0.03 0.09 0.025 2.3 i

j Aug Ob 0.05 0.023 0.024 0.004 0.7 l Flood 0.03 0.019 0.019 0.005 0.7 j Sept Db 0.14 0.022 0.042 0.005 1.6 l Flood 0.14 0.019 0.049 0.006 0.5 -

4 Oct Db 0.05 0.008 0.04 0.011 <0.2 Flood 0.05 0.012 0.01 0.012 <0.2 Nov Ob 0.01 0.006 0.01 0.016 <0.2 Flood 0.01 0.006 0.02 0.017 0.28 1

Dec Ob 0.04 <0.005 <0.005 0.021 0.3 l Flood 0.03 <0.005 <0.005 0.015 0.3 i

NOTE:

)

• Based on data collected on ebb and flood tides during the 1974 water quality monitoring program 4

6

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Calgon Corporation Correspondence Regarding LCS- 1000 Formulations 1

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g,,y February 7,1997 Mr.serpown ChemistrySupport NortheastNuclearEasrIF Post OfBeeBoa 128 Waterfbrd,CT 06385 0128 Subjeet: LCS 1000 Samples DearJel(

During 6e annroer of 1996 Cafgo'n developed LCS 1000 to be used in your elosed coolingwater The product contained sodium molybdate and sodiurn tolytrianole as sorrosion

• De product also contained a blend of sodium carbonate and sodium bi-earbonate to bulFer the system pH. Severa1 months later aAer testing at your facRity and at Calgon,it was detstmined that the product pH was slightly too high. At that point the product forundation was modi 8ed by eliminating the sodium carbonate Dom the product (originally at

, 0.283% sonmentration in the product). .

la December 1996,'you requested two liter bottles fbr toxicity testing Two samples were ortunately, the change in fbrmulation had not been ibrwarded to made up in our " sample" thislab and the original samplei lab. U(bm1=% whh the sodium carbonate present, was s TWs errorwas totally our thult.

As you are aware, Calgon is certified to ISO 9002, and we make all attempts to assure our products and processes n'est ou' strict quality standards. All manufheturing speci6 cations ihr the "new" fonnulation have been pu in place and I see no way this problem could occur in the manufheturing process The sample lab has now been notiSed and two new samples will be sent to y00 $ Swey.

I apologies R$ sin Ilr tMs Efor. Please M IW to coRiadt me Eyou need MIy Anther hibrination regarding this plustion CALDONCORPORATION D

• f C*er P.O. 40K 1648 s PsTTeeumeM. PA 16est e Peteele tetel 464 0008 e pas tota) 464 9027 lamovatwo f=*-=ama, Casatwe Sawtems ...ssues togg

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