RBG-30321, NPDES Noncompliance Notification:On 890309,sample Collected Contained 0.6 mg/1 Total Residual Chlorine at Outfall 004. Caused by Inability to Adjust Chlorine Dosage W/Fluctuating Flow & Variable Quality.Engineering Study Underway

NPDES Noncompliance Notification:On 890309,sample Collected Contained 0.6 mg/1 Total Residual Chlorine at Outfall 004. Caused by Inability to Adjust Chlorine Dosage W/Fluctuating Flow & Variable Quality.Engineering Study Underway

ML20236D257
Person / Time
Site:	River Bend
Issue date:	03/14/1989
From:	Booker J GULF STATES UTILITIES CO.
To:	Oneill M LOUISIANA, STATE OF
References
RBG-30321, NUDOCS 8903230028
Download: ML20236D257 (2)

Text

m-W GULF STATES UTILITIES COMPANY P O S T O F F I C E B O X 2 9 51 BEAUMONT, TEXAS 777o4 AREACODEdo9 838 6631 -

March 14, 1989 I RBG- 30321 File No. G1.11.2 Ms. Maureen O'Neill, Assistant Secretary )

Office of Water Resources Department of Environmental Quality Post Office Box 44091, Capitol Station Baton Rouge, LA 70804-4091

Dear Ms. O'Neill:

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

WP0409 for Outfall 004, treated sanitary waste from power station to Grants Bayou. Whereas the effluent limitations for total residual chlorine (TRC) ir.

, the outfall are a minimum of 0.8 mg/l and a maximum of 2.0 mg/1, a . sample i l collected at 0905 on March 9, 1989, contained 0.6 mg/l TRC. When the low TRC I level was discovered, immediate adjustments of the calcium hypochlorite dose rates were made to obtain an effluent within the allowable range. A sample I taken at 1050 on March 9, 1989, indicated a concentration of 0.9 mg/l TRC.

The cause of this excursion was an inability to adfu't s the chlorine dosage wit.h effluent of fluctuating flow and. variable quality. Similar problems l were encountered in September and November 1988, and reported to you in l 1etters dated October 14 and November 17, 1988, respectively.

l In those letters, Gulf States Utilities Company (CSU) indicated that an ,

investigation was underway to determine if changes in design and/or operating  !

practices could improve reliability of chlorination at this outfall. 1 Although some improvement was realized, the present nonconformance indicates l that the measures were inadequate to prevent recurrence. We are now engaging  !

an engineering firm to study our sewage treatment plants (Outfalls 004 and 1 005) with part of the study focussing on disinfection problems at outfall 3 004. Possible solutions include a redesigned chlorination system (e.g.,  !

different contact chamber design, source of hypochlorite) and the possibility  !

of converting to ultraviolet light disinfection (which would require a permit modification). We expect the study to be completed by June 30, 1989, and will inform you of our plants shortly thereafter.

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 890323002G 890314 PDR S ADOCK 0500045G  !

PDC I I l

. . .'- i s -*'

o ,

Ms. O'Neill '

Page 2 information submitted. Based on my' inquiry of the person or persons who j 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 possibility of fine and imprisonment for knowing violations.

l Sincerely

,fo  ?

J. E. Booker Manager-River Bend Oversight' River Bend Nuclear Group JEB/LAE/JVC/JWC/ch cc: Capitol Regional Office Water Pollution Control Division ,

11720 Airline Highway Baton Rouge, LA.70817-1720 1 U.S. Nuclear Regulatory Commission . . _

Document Control Desk' Washington, D.C. 20555 U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000-Arlington, TX 76011 *

s 3

1 NRC Resident Inspector Post Offica Box 1051 St. Francisville LA 70775 l

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