ML19329A498

Discusses Facility Effect on Dissolved Oxygen Concentrations in Lake Keowee.Drawings Encl

ML19329A498
Person / Time
Site:	Oconee
Issue date:	02/24/1972
From:	Dewey C DUKE POWER CO.
To:	Zeller H ENVIRONMENTAL PROTECTION AGENCY
References
NUDOCS 8001060010
Download: ML19329A498 (5)

Text

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r. o. s o m m e GENERAL OFFICES Tcttenone, anca ros 422 SOUTH CHURCH STREET 3I4*48II CHAHLOTTE, N. C. 28201 m

Feb rua ry 24, 1972 9

Q Mr Howard D Zeller 2 N

& 5 4 3 Chief, Permit Branch Environmental Protection Agency ( p NhdT J3 i //

1421 Peachtree Street, NE '8 Atlanta, Georgia 30309 9 f

Re: January 7, 1972, letter to 8 B Parker

Dear Mr Zeller:

The effect of Oconee Nuclear Station on the dissolved oxygen concentrations in Lake Keowee is expected to be as follows:

Extreme Condi tions (Drawing EO- 1100-23)

Enclosed drawing EO-1100-23 shows the predicted distribution of dissolved oxygen (DO) concentrations in Lake Keowee as projected from the extreme data of record on Lake Norman - Marshall Steam Station data. During summer, when Oconee is dis-charging water containing less than 0.5 mg/1, apprcximately 100 acres will have a concentration of less than 1 mg/l to an average depth of 4 f t and a maximum depth of 40 ft (immediately adjacent to the discharge structure). 700 acres will have less tnan 2 mg/l DO and the average depth of the 2.0 mg/l boundary will be about 1 ft. 1200 acres are expected to have concentrations less than 3 mg/l and the average depth will be 2 ft. 3000 acres will have less than 4 mg/l and throughout most of the area the reduced concentrations will extend down into the region in which the naturally occurring concentrations are less than 4 mg/1. 5100 acres will have less than 5 mg/l 00 and again this influence extends down into the re-gion of where naturally occurring concentrations are less than 5 mg/1.

Averace Conditions (Drawing E0-i!00-24)

This drawing presents isopleths of 00 and areas which represent the average (expected the influe)nce of Oconee Nuclear Station. conditions during the worst month of the year in Lake Keo The area with concentrations less than 1 mg/l is 100 acres with average depth of 4 f t; concentrations less than 2 mg/l will prevail over 700 acres to average depth of 2 ft; 3 mg/1, 1200 acres, 4 ft; 4 mg/1, 2100 acres, 7 ft. 3000 acres are expected to have less than 5 mg/l and this will extend down into the zone of the lake where natural concentrations are less than 5 mg/1.

The DO-Area values predicted for Oconee-Lake Keowee are based on actual surveys on Lake Norman in tho areas affected by Marshall Steam Station. The Lake Norman data were then extrapolated to Oconee-Lake Keowee by a ratio of Oconee's cooling water flow rates to those existing at Marshall during tests to produce the pre-dicted results shown on the enclosed drawings. Expendi ture of considerable time

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Mr Howard D Zeller Page 2 February 24, 1972 and talent failed to produce better predictive methods. We do not feel that present predictive methods can distinguish between average and extreme meteoro-logical and lake drawdown conditions. Our predictions, however, we believe are conservative since,

1) Oconee discharges into a more open lake than Marshall and mixing will be greater thus dilution by higher DO water will occur

2) . All predictions are based on plume center-line measurements and 00 values would be higher in other parts of the plume, increasing to natural values at plume boundaries.

As you know, lakes naturally stratify in this area and the average depth of water in Lake Norman, outside tha influence of Marshall Station, which contains 5 mg/l l or more dissolved oxygen is about 25 ft.

It is expected that Oconee's discharge temperature will nonnally be greater than Lake Keowee's surface temperature, so an interflow situation is not expected to occur.

Very truly yours,

,, g7 ( l'-(.49 Chas A Dewey. J r ./

Principal Envi ronmental Engineer CADj r/bw cc Jr R C DeYoung 7 Atomic Energy Commission Washington, D C 20545 cc Mr J R McWherter Oak Ridge National Laboratory P O Box X Oak Ridge, Tennessee 37830.

cc U S Army Corps of Engineers 201 East St Julian Street Savannah, Georgia 31401 I

cc Mr Kenneth.Tinsley S C Pollution Control Authority P O Box 11628 Columbia, S C 29211 l l

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A. < Smg /I = 5100 Acres B. < Omg/ I = 3OOOAcres h C. < 3mg/1 = 1200 Acres '

D. < 2mg/l = 700 Acres E E.< lmg/l 100 Acres l o . 'l gowEE N 87 ATION 4 m i O 4000 3000 4 /

OCONEE NUCLEAR STATION b

EXPECTED EXTREME AREAS OF 0.0.<5mg/l

.@.I.E. PRODUCED IN LAME KECWEE BY OCONEE BASED ONLARGEST AREA OF DO.<5mg/l OCCURING NUCLEAR STATION SEPT. C69 IN 1968-1971 INCL. PERIOD OF RECORD.

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4 A. < 5mg /I =3000 Acres B l

' 8. < 4mg/ I = 2100 Acres C. < 3mg/ I = 1200 Acres 'O D. < 2 mg/l = 700 Acres E E. < 1 mg/I = 100 Acres 0 . MEDWEE v- goc iminie MLL

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NOTE:

EXPECTED NORMAL AREAS OF D.O. < 5 mg/l BASED ON AVERAGE AREA OF D.O.<5 mg/1 PRODUCED IN LAKE KEOWEE BY OCONEE OBSERVED IN LAKE NORMAN AROUND MARSHALL NUCLEAR STATION STATION DUR ING SEPTEMBER 1968 1971 INCL.

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