RBG-31154, NPDES Noncompliance Notification:On 890621,sample Collected from Outfall 004 Contained 2.5 mg/1 Total Residual Chlorine. Caused by Drawing Sample in Brief Interval Before Flows Stabilized Relative to Hypochlorite Dose Rates

NPDES Noncompliance Notification:On 890621,sample Collected from Outfall 004 Contained 2.5 mg/1 Total Residual Chlorine. Caused by Drawing Sample in Brief Interval Before Flows Stabilized Relative to Hypochlorite Dose Rates

ML20245L281
Person / Time
Site:	River Bend
Issue date:	06/26/1989
From:	Deddens J GULF STATES UTILITIES CO.
To:	Oneill M LOUISIANA, STATE OF
References
RBG-31154, NUDOCS 8907050430
Download: ML20245L281 (2)

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GULF STATES UTILITIES COMPANY (Of RIVER BEND STATION POST OFFICE BOX 220 ST FRANCISVILLE. LOUISIANA 70775 AREA CODE 504 635-6094 346 8651 June 26, 1989 RBG- 31154 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. WPO409 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. Whereas 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 1135 hours0.0131 days <br />0.315 hours <br />0.00188 weeks <br />4.318675e-4 months <br /> on June 21, 1989 contained 2.5 mg/l TRC. By 1530 that afternoon TRC was back within the limits at 1.2 mg/1.

This excursion is attributed to sampling error. Environmental personnel were unaware that system components (package units) had recently been switched and the tertiary sand filter had just completed backwash and partial draining.

The sample was drawn during a brief interval before flows (hence dilution) had stabilized relative to hypochlorite dose rates. Thus, the sample was not representative of prevailing conditions. Informal calorimetric spot checks of TRC levels indicated compliance (around 1 mg/1) a few minutes before and after the excursion. Sewage plant operators have been instructed to notify environmental personnel of system adjustments which may interfere with representative sampling.

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 1 infonnation subnitted. 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 i significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Sincerely, 8907050430Ogh50 PDR S

ADOCK O pg [

,,Q f'ft e J. C. Deddens Senior Vice President 7p3 River Bend Nuclear Group ' l

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. . ,1 cc: U. S.' Nuclear Regulatory Commission Documeot 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. Francisvilla, 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 l 1445 Ross Avenue Dallas, TX 75202-2733 l.

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