ML20247N384

NPDES Noncompliance Notification:Monitoring for Chlorine Residual at Discharge 001 Discovered Being Performed by Daily Grab Samples Rather than Required Chlorine Analyzer. New Chlorine Analyzer Scheduled to Be in Svc 891231

ML20247N384
Person / Time
Site:	Beaver Valley
Issue date:	07/18/1989
From:	Druga R DUQUESNE LIGHT CO.
To:	ENVIRONMENTAL PROTECTION AGENCY
References
ND1PCD:1309, NUDOCS 8908020380
Download: ML20247N384 (2)

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%p i Telephone (412) 393-6000 00a4 Shefip6ngport PA 15077-0004 July 18, 1989 ND1PCD:1309 United States Environmental Protection Agency Region III, Compliance Office 6th and Walnut Street Philadelphia, PA 19106 EPA Permit No. PA0025615 Recor.t,able Occurrence

Dear Sir:

As required by EPA Permit No. PA0025615, the following information is provided in regard to a reportable occurrence at Beaver Valley Power Station:

During an Internal Audit, it was discovered that monitoring for chlorine residual at Discharge 001, the Unit #1 and Unit #2 Cooling Tower Blowdown outfall, was being performed by daily grab samples during chlorination rather than by the required continuous chlorine analyzer during the last four years. The installed continuous chlorine analyzer has proven to be very unreliable, and has caused many operational and maintenance problems. Technicians were routinely taking grab samples during chlorination rather than relying on the analyzer since this practice had been allowed in previous editions of Beaver Valley Power Station's NPDES Permit. Although the monthly Discharge Monitoring Reports for Outfall 001 indicate that grab sampling rather than continuous monitoring had been performed, no special notification of your office was made.

Beaver Valley is currently procuring a replacement continuous chlorine analyzer since the installed continuous chlorine analyzer has been judged to be non-repairable. The new chlorine analyzer is scheduled to be in service 12/31/89. Grab samples for chlorine residual using amperometric titration will continue to be taken during periods of chlorination until the replacement analyzer is installed.

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.If you have any questions concerning this. report, please do not hesitate to contact me. -

Very.truly yours, R. J. Dru a Manager, Technical Services-Do/cj Attachment bec: J. D. Sieber .A. M. Dulick (3)

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