RBG-31319, NPDES Noncompliance Notification:On 890727,total Residual Chlorine Concentration in Effluent Exceeded Limit.Caused by Improper Balance of Hypochlorite Tablet Dosage & Flows. Engineering Design of Entire Treatment Sys to Be Performed

NPDES Noncompliance Notification:On 890727,total Residual Chlorine Concentration in Effluent Exceeded Limit.Caused by Improper Balance of Hypochlorite Tablet Dosage & Flows. Engineering Design of Entire Treatment Sys to Be Performed

ML20245F486
Person / Time
Site:	River Bend
Issue date:	08/02/1989
From:	Deddens J GULF STATES UTILITIES CO.
To:	Oneill M LOUISIANA, STATE OF
References
RBG-31319, NUDOCS 8908140332
Download: ML20245F486 (2)

Text

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. 2 August 2, 1989 RBG- 31319 File Nos. G1.11.2 Ms. Maureen O'Neill, Assistant Secretary Office of Water Resources LA Department of Environmental Quality Post Office Box 44091, Capitol Station Baton Rouge, LA 70804-4091  ;

Dear Ms. O'Neill:

Water Discharge Permit No. WP0409 River Bend Station - Unit 1 This is to inform you of a noncompliance with Water Discharge Permit No.

WP0409 for total residual chlorine (TRC) at Outfall 005 which occurred July 27, 1989.

Outfall 005 is " treated sanitary waste from training center to Grants Bayou."

A sample of this effluent, collected at 2:45 p.m. on July 27, 1989, yielded an average TRC concentration of 0.55 mg/l which is in violation of the permitted minimum of 0.8 mg/1. The discharge was stopped immediately upon recognition of the condition (at about 3:05p.m.). Flow at the time had been about 0.7 gallon per minute (GPM).

The cause of this excursion was an improper balance of hypochlorite. tablet dosage and flows. In response to decreasing flows from the pond, the system operator removed hypochlorite tablets from contact chamber. Too many hypochlorite tablets were removed causing the TRC to drop below 0.8 mg/1.

With the narrow required range of 0.8 to 2.0 mg/l TRC, prevention of recurrence of maximum or minimum excursions will be extremely difficult using existing equipment. The entire treatment system at Outfall 005 was the subject of a recent conceptual evaluation by consulting engineers. Results and recommendations of this study have led to a decision to perform engineering design and obtain construction bids to eliminate Outfall 005 by piping sanitary waste from the Training Center to the existing sanitary treatment system for Outfall 004. A permit modification request describing these plans wilt be submitted as soon as engineering and schedule details are available.

I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information submitted, the information submitted is, to the best of my P

8908140332 s90002 B I I DR ADOCK 0500

1 s. O'Neill Page 2-knowledge.and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false. information, including the possibility of fine and imprisonment for. knowing violations. .f Si cerel ,

](, fim J. C. Deddens Senior-Vice President River Bend Nuclear Group JCD dh/JVC/ch cc: 4YNuclear Regulatory Commission U. S.

Document Control Desk..

Washington, D.C. 20555 U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, TX '76011 NRC Resident Inspector Post Office Box 1051 St. Francisville, LA 70775 Capitol Regional Office Water Pollution Control Division 11720 Airline Highway Baton Rouge, LA 70817-1720 Director-Water Management Division U. S. Environmental Protection Agency, Region VI Allied Bank Tower 1445 Ross Avenue Dallas, TX 75202-2733 i

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