ML20077D511

NPDES Noncompliance Notification:On 941201,pH Excursion Occurred at Outfall 004.Investigation Revealed That Ph Meter Used Not Operating Correctly.Tap Water Added to Sand Filter Influent & Sodium Bicarbonate Added to Treatment Tanks

ML20077D511
Person / Time
Site:	River Bend
Issue date:	12/06/1994
From:	Stoma S ENTERGY OPERATIONS, INC.
To:	Michelle Simmons ENVIRONMENTAL PROTECTION AGENCY
References
RBG:41-084, RBG:41-84, NUDOCS 9412090063
Download: ML20077D511 (2)

Text

.

d g

"cmENTERGY

+

L"'* lao"o?e"iT* "

Po Bcx 220

, St Francmvme. LA 70775 December 6,1994 Ms. Mary Simmons U.S. Environmental Protection Agency Region 6 - 6W-EA 1445 Ross Avenue Dallas, TX 75202-2733

Subject:

Treated Sanitary Wastewater pH Excursion

Reference:

NPDES Permit LA0042731 File No. G1.11.7 RBG: 41,084

Dear Ms. Simmons:

This letter is a written follow-up for a prompt notification of the pH excursion which occurred at Outfall 004, treated sanitary wastewater, on December 1,1994 at River Bend Station.

A pH reading of 5.62 was obtained on the weekly grab sample of Outfall 004 at 10:20 a.m. The subsequent investigation revealed that the pH meter used at the treatment facility was not operating correctly.

Immediate corrective actions included addition of tap water to the sand filter influent, and the addition of sodium bicarbonate to the treatment tanks. The monitoring frequency was increased and a pH of 6.89 was obtained at 2:06 p.m. Since Outfall 004 flows into the cooling tower blowdown line (Outfall 001), which discharges into the Mississippi River, a grab sample was obtained at Outfall 001 and analyzed to have a pH of 7.84.

9412o90063 PDR 9412o6

- ADOCK 050oo458 eda >0

Treated Sanitary Wastewater pH Excursion December 6,1994 RBG: 41,084 Page 2 of 2 The operating problems with the treatment facility's pH meter were corrected by installation of a new probe and re-calibration using fresh buffers. As part of corrective action to prevent reoccurrence a daily three point calibration will be performed and records of these calibrations maintained at the treatment facility. The pH meter used in the Environmental Services Lab will also be designated as a back-up for the treatment facility's pH instrument. This instrument is also calibrated on a daily basis.

I certify under penalty of law that this document and all attachments were prepared under the 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, 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.

Sincerely S. Keit toma Coordinator Environmental (Acting) cc: Nuclear Regulatory Commission Document Control Desk Washington D.C. 20555 U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 l

NRC Resident inspector )

1 P.O. Box 1051 St. Francisville, LA 70775 l 1

l