Document XRKjvqB2L6GgZXEeEV70rNMQJ

INDUSTRIES PPG INDUSTRIES. INC. CHEMICAL DIVISION - U.S. P. 0. BOX 1000 LAKE CHARLES, LA. 70602 January 4, 1990 Ms. Diana Buck U S Environmental Protection Agency Water Enforcement Branch 1445 Ross Avenue Dallas TX 75202-2733 (6W-E) Dear Ms. Buck: RE: NPDES Permit No. LA0000761 In accordance with the NPDES Permit #LA0000761 Part II Section D reporting requirements, PPG Industries, Inc., lake Charles Plant is hereby submitting the attached report of a mercury permit . limit violation which occurred at Outfall 101 on Dec. 27, 1989. The phone report of a mercury violation occurring December 26, 1989, is to be voided as a flow measurement error has subsequently been found. If you have any questions regarding this report, please contact me at (318) 491-4450. g 1 ni'orol Mark Wood Associate Research Chemist ce Attachment CERTIFIED MAIL (P105 355 996) SL 026723 NPDES NON-COMPLIANCE REPORT Company Name:_ Mailing Address: Company Location: Permit Number: Outfall Number: Outfall Parameter: Date of Deviation: Time of Deviation: Maximum Discharge Limit: Limit Deviation: PPG Industries, Inc. P 0 Box 1000 Lake Charles LA 70602 Columbia Southern Road Westlake LA 70669 LA 0000761 101 Mercury December 27, 1989 24-hour Composites ending December 28, 1989 at 7:00 am 0.51 lbs/day +0.21 lbs/day Description of Incident: The Mercury Cell Unit was down during this period due to emergency weather conditions (natural gas demand during extrem cold weather), but the wastewater treatment system was operating. Also, the combined Mercury Cell Sewer downstream of the monitoring locations was being relined. In order to accomplish relining while in use, a portable pump was used to route water around the segment under repair. A leaking storm valve allowed some untreated wastewater to enter the downstream segment under repair. This situation would normally be detected, but the downstream backup sample site was out of service due to repair. This mercury discharge was ultimately found when the portable pump lost prime several times, allowing the normally downstream flow to back up into the NPDES monitoring location. Upon detection, the leaking valve was tightened, the line plugged, and closure verified with dye checks. Contaminated wastewater was transferred from segments of the sewer system by vacuum truck and portable pumps to treatment. Although caused recurrence will properly seated accomplished by by a unique set be prevented by each time it is collecting grab of abnormal circumstances, confirming the storm valve closed. This will be samples downstream. is Phone Notifications: December 28, 1989, by M. Wood 1. EPA, 2:17 pm. Marietta Mount , 2. DEQ (Baton Rouge), 2:19 pm, S. Rothman SL 02672