ML20212B376

NPDES Noncompliance Notification:On 860602,while Draining Water Treatment Sludge Pond,Discharge Limitation Exceeded. Pond Drained & Cleaned & Temporary Diversion of Clearwell Overflow to 002 Discharge Discontinued

ML20212B376
Person / Time
Site:	Cooper
Issue date:	07/29/1986
From:	La'Toya Cooper NEBRASKA PUBLIC POWER DISTRICT
To:	Ringenberg J NEBRASKA, STATE OF
References
NUDOCS 8608060310
Download: ML20212B376 (3)

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July 29, 1986 Mr. Jay D. Ringenberg Section Head, Permits and Compliance Water Quality Division Nebraska Department of Environmental Control P.O. Box 94877 Lincoln, Nebraska 68509-4877

Dear Mr. Ringenberg:

Subjects Nebraska Public Power District (NPPD)

Cooper Nuclear Station (CNS)

NPDES Permit No. NE 0001244 Draining and Cleaning of Sludge Settling Pond This letter confirms the completion of the draining and cleaning of the sludge settling pond at CNS and discontinuing the temporary diversion of the clearwell overflow to the 002 discharge. Also, this letter provides results of the additional analyses, which were performed as directed by your department, and written notification, as directed by Dick Varner, of NPDES discharge violations at the 004 discharge during this time period.

Draining of the water treatment sludge pond was initiated on June 2, 1986, to facilitate the cleaning of the sludge settling pond. Flows to the sludge pond were restricted when and where possible and planks were removed from the pond overflow structure in intervals to reduce the discharge of lime. Due to the volume of water entering the pond (estimated flow of 100-300 gallons / minute), the water picked up lime as it flowed over the lime bed in the pond resulting in several violations in total suspended solids (Table 1). To reduce this flow, permission was obtained from your department to temporarily divert water from the clearwell overflow to the 002 headwall outfall. On June 7, this diversion was completed, and flow at the 004 discharge was reduced to 1-2 gallons / minute. During the remainder of the draining operation, which was completed on June 8, total suspended solids at the 004 outfall remained within NPDES discharge limitations, but pH values did not.

Lime removal from the sludge settling pond was initiated on June 9 and completed on June 23. During the lime removal operation, total suspended solids remained within NPDES permit limitations while pH values ranged slightly above and ulightly below the maximum permit limitation of 9.O. Following completion of the 8608060310 860729 h PDR 8

ADOCK 05000298 ,g PDR i

l

Mr. Jey D. Ringsnborg

• July 29, 1996 Page 2 lime removal operation, the planks were added to the sludge pond overflow structure, the clearwell overflow was realigned to the 004 discharge, and flows were established to the sludge pond.

If you have any questions regarding these responses, please contact me.

Sin ely, u

L. John op er Environmental honager LJC/eyctdg cc: R. D. Martin D. 8. Vassallo G. R. Horn R.L. Beilke File CB175

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Table 1. Total suspended solids and pH analyses conducted at CNS's 002 (headwall) and 004 (water treatment sludge i I

settling pond) discharges during draining and cleaning i of the sludge settling pond. L i Total ,

} Suspended  !

j Flow Solidt t

., Date Time com oH mo/1 Comments I

j 002 Discharoe i

j 06/08 1130 50 8.7 '

06/23 1330 50 7.2 1

j 004 Discharoe l 1

06/02 1205 30 7.7 3.0 Prior to draining pond

)

l 06/02 1220 300 7.6 2.0 Started draining pond l

\

06/02 1400 100 8.4 12.0 -

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i 06/02 1400 300 9.5 12.0 Pulled board at Weir 06/02 1545 100 8.4 673.0*

I I 06/02 1545 300 8.4 168.0* Pulled board at weir '

)'

06/03 1430 100 8.0 42.0 06/03 1430 300 8.4 3,437.0* Pulled board at weir t

l 06/04 1050 100 9.0 546.0* 1 i i j 06/04 1050 100 9.1* 281.0* l j 06/05 1300 200 9.1* 3,197.0* - i j 06/06 1030 200 10.1* 3,497.0* l i

06/07 1030 1 9.8* 8.0 Clearwell overflow to 002 1

06/08 1130 2 9.3* 8.0 Completed draining pond  !

.  ?

l 06/09 1100 2 8.9 17.0 Started lime removat j i

4 06/23 1330 0 9.1* 32.0 Completed lime removal l

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• Sample exceeds NPDES discharge limitation. [

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