RBG-30536, NPDES Noncompliance Notification:On 890410 & 11,effluent Limitations for Outfall 004 Exceeded Limits.Caused by Inability to Effectively Adjust Chlorine Dosage W/ Fluctuating Flows & Oxidant Demand

NPDES Noncompliance Notification:On 890410 & 11,effluent Limitations for Outfall 004 Exceeded Limits.Caused by Inability to Effectively Adjust Chlorine Dosage W/ Fluctuating Flows & Oxidant Demand

ML20245A859
Person / Time
Site:	River Bend
Issue date:	04/14/1989
From:	Plunkett T GULF STATES UTILITIES CO.
To:	LOUISIANA, STATE OF
References
RBG-30536, NUDOCS 8904250416
Download: ML20245A859 (2)

Text

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d my GULF STATES UTILITIES COMPANY 'a

%ER SEND STATION POST OFFICE box 220 ST FRANCl$ylLLE LOutslANA 70775 April 14, 1989

' RBG-30536 File Nos. G1.11.2 TFP-069-89 No Response Required 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 Outfall 004, treated sanitary wastewater from power station to Grants Bayou. The effluent limitations for total residual chlorine (TRC) in the outfall are a minimum of 0.8 mg/l and a maximum of 2.0 mg/1. A sample collected at 1307 hours0.0151 days <br />0.363 hours <br />0.00216 weeks <br />4.973135e-4 months <br /> on April 10, 1989 contained 2.7 mg/l TRC. A sample collected at 1258 hours0.0146 days <br />0.349 hours <br />0.00208 weeks <br />4.78669e-4 months <br /> on April 11, 1989 contained 0.4 mg/l TRC.

On each occasion when the unacceptable TRC levels were noted, immediate adjustments of the calcium hypochlorite dose rates were made to obtain an effluent within the allowable range. Thus, at 1521 hours0.0176 days <br />0.423 hours <br />0.00251 weeks <br />5.787405e-4 months <br /> on April 10 the TRC concentration was 1.3 mg/l and at 1410 hours0.0163 days <br />0.392 hours <br />0.00233 weeks <br />5.36505e-4 months <br /> on April 11 the TRC concentration was 0.9 mg/1. Samples taken on succeeding days have thus far indicated concentrations of 1.4 - 1.5 mg/l TRC.

The cause of these excursions was an inability to effectively adjust chlorine dosage with fluctuating flows, oxidant demand, and variability in the quality of hypochlorite tablets. Similar problems were encountered and reported last attumn and on several occasions in recent weeks. As noted in a letter dated March 14, 1989, consulting engineers are developing recommendations for a long-term solution to the problem of reliable disinfection at Outfall 004 Results of these studies are expected by the end of this month. In the meantime, some reassignments of personnel have been made to provide for increased surveillance of the effluent quality and for greater technical support of sewer plant operations.

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. 8 I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system i 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 knowledge and belief, true, accurate and complete. I am aware that there are.

significant penalties for submitting false information, including the l possibility of fine and imprisonment for knowing violations, i

Sincerely,  !

T. F. Plunkett l Plant Manager j l TFP/LAE/N/JVC/ch I

J cc: U. S. Nuclear Regulatory Commission Document Contrel Desk i Washington, D.C. 20555 I l

U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 i / i l Arlington, TX 76011 {

NRC Resident Inspector Post Office Boy 1051 St. Francisville, LA 70775 i

Capitol Regional Office l Water Pollution Control Division 11720 Airline Highway Baton Rouge, LA 70817-1720 )

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