ML20247P883

NPDES Noncompliance Notification:Biological Oxygen Demand of Sample from Disharge Point 501 Exceeded Monthly Average Permit Limit.Caused by Increase in Sewage Treatment Plant Loading.Sampling Frequency Increased & Trench Backfilled

ML20247P883
Person / Time
Site:	Peach Bottom
Issue date:	05/26/1989
From:	Danni Smith PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	PENNSYLVANIA, COMMONWEALTH OF
References
NUDOCS 8906060269
Download: ML20247P883 (3)

Text

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" PHILADELPHIA ELECTRIC COMPANY p

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, , - ' PEACH BOTTOM ATOMIC POWER STATION

, R. D.1. Box 208

1. Delta, Pennsylvania 17314.

L recu sorTow.ms powsm or excrumcr p17) 4567014 D. M. Smith Vice President May 26, 1989 i

Department of Environmental Resources Bureau of_ Water Quality Management One_Ararat Blvd.

Harrisburg, PA 17110

SUBJECT:

Noncompliance with National Pollutant Discharge Elimination System (NPDES) Permit Peach Bottom Atomic Power Station Permit No. PA 0009733 G:ntlemen:

DESCRIPTION-OF NONCOMPLIANCE The Biological Oxygen Demand (B00) of a sample taken from discharge point 501- (Sewage Treatment Plant) exceeded the monthly average permit limit. The monthly maximum limit was not exceeded.

Date Sample Taken: 4/5/89 4/13/89 4/18/89 4/20/89 4/25/89 4/27/89 Date Results Received: 4/24/89 4/25/89 5/4/89 5/4/89 5/10/89 '5/10/89 Results of Analysis: 46 mg/l 59 mg/l 29 mg/l 56 mg/l <12 mg/l 23 mg/l Permit Limitation: 30 mg/l Average 60 mg/l Maximum Monthly Average 37 mg/l CAUSE OF NONCOMPLIANCE The cause of the noncompliance.was an increase in the sewage treatment plant loading due to an increase in the power plant outage work force and rain water

-intrusion.

DURATION OF NONCOMPLIANCE Based on the above analysis the duration of the noncompliance was twenty-

-five days, 8906060269 890526 PDR T'

i 6 ADOCK 05000277  ?

PNV  ; 08 p

D:partment of Environmental Resources Page,2 .

CORRECTIVE ACTION Upon receipt of the initial B00 sample, the sampling frequency was increased to determine the extent and cause of the high B00. The second aeration tank was placed in service on April 21, 1989. The 800 of the final effluent decreased to less than 30 mg/l April 25, 1989.

PREVENTION OF FURTHER OCCURRENCES:

Further investigation into the higher than normal. flow rates revealed that there was surface water run off intrusion during rain conditions. This run off added significantly to the hydraulic loading and interfered with the biological process. .The-intrusion was due-to an open header tee connection in an open trench. This tee connection was open to support modification work which was underway. Standpipes were installed into the tee connection to an above grade elevation and the trench was backfilled. This was completed on May 6, 1989.

Sincerely, cc: J. T. Boettger, Public Service Electric & Gas T. M. Gerusky, Commonwealth of Pennsylvania T. P. Johnson, USNRC Senior Resident Inspector T. E. Magette, State'of Maryland W. T. Russell, Administrator,' Region I, USNRC H. C. Schwemm, Atlantic Electric J. Urban, Delmarva Power Director EPA,

, ONRR Philadelphia, PA l US NRC L Washington, DC 20555 l

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@J , ,c D:partment of Environmental Resources :

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E. J. Bradley,;S23-1, . .

", .' Commitment Coordinator. S7-1 Correspondence' Control Desk, NS -

T. E. Cribbe,- Al-2S-P. F. D'Angelo,-Valley Forge

E. P. Fogarty, S7-1 J. F. Franz, A4-1S

'J. W. Gallagher, S25-1:

G.'A.' Hunger, S7-l'

-S.lJ.:Kowalski,S25-1 T J. M.-Madaraf S10 A.'J.~ Marie, H2-1 C. J. McDermott, S13-1 C. A. McNeill. Jr., S26-1

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DE L. 01tman's,!A4-1S'

'T.'E.iShannon, N2 D.;M. Smith, SMO-1 ,

• W.'B. W111sey. S9-2

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