ML20127M657

NPDES Noncompliance Rept:On 850418,biological Oxygen Demand of Sample from Discharge Point 108 in Sewage Treatment Plant Exceeded Permit Limit.Caused by Pin Floc Carryover from Clarifier.Pressure Filters Utilized

ML20127M657
Person / Time
Site:	Peach Bottom
Issue date:	05/03/1985
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	PENNSYLVANIA, COMMONWEALTH OF
References
NUDOCS 8505230326
Download: ML20127M657 (2)

Text

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PHILADELPHIA ELECTRIC COMPANY 2850596570 2301 MARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 (215)8414000 t

May 3, 1985

' Department.of-Environmental Resources Bureau of Water Quality Management-One Ararat Blvd.

Harrisburg, PA' 17110 Gentlemen:-

SUBJECT:

Noncompliance with NPDES Permit Peach Bottom Atomic Power Station Permit'No. PA 0009733 DESCRIPTION OF NONCOMPLIANCE:

The biological oxygen demand (BOD) of a sample from discharge point 108 (Sewage Treatment Plant) exceeded the permit limit.

Date Sample Taken: 4-18-85 Date Results Received: 4-29-85 Results of Analysis: 130 mg/l Permit Limitation: 45 mg/l CAUSE-OF NONCOMPLIANCE:

The cause of the noncompliance is believed to be pin floc carryover'from the clarifier. It is unknown what is causing the pin floc. carryover.

DURATION OF NONCOMPLIANCE:

U The duration of the noncompliance is unknown since this is a continuation of the April 4, 1985 exceedance which was previously reported. ,

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' CORRECTIVE ACTION:

2850596570

~The Sewage Treatment Plant pressure filters were returned to service on April 19, 1985. It is believed that the effluent was within permit limits upon utilization of the pressure filters. The final effluent was resampled for BOD on April 25, 1985. The result of this sample'was 10 mg/1. The result of a sample for BOD on the equalization basin'on April 19 was 288 mg/1 and the result of a BOD sample of unchlorinated effluent was 31 mg/1. This represents a 89 percent decrease in. BOD by the sewage treatment plant. ,

r PREVENTION OF FUTURE OCCURRENCES:

Although the pressure filters have brought the effluent into compliance, we are continuing our efforts to correct the pin floc carrover from the clarifier. . Increased surveillance and sampling is being maintained to help determine and reduce the cause of the carryover.

Very truly yours, W. T. Ullrich Superintendent Nuclear Generation Division JAV/NTUtala cc s; Environmental Protection Agency

' Water Permits Branch Pennsylvania Section 3WM52 841 Chestnut Building

, Philadelphia, Pennsylvania 19107 Director /

Office of Nuclear-Reactor Regulation,/~f US Nuclear Regulatory Commisssion f Washington, DC 20555 Administrator Region I

(- Office of Inspection and Enforcement (

US Nuclear Regulatory Commission 631 Park Avenue

,' ._ King of Prussia, Pennsylvania 19406 i

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