Document X7a3VZdpKmQg7mLb7oM8LEZ3J

PPG INDUSTRIES,INC. December 28, 1988 CHEMICALS P. Q BOX 1000 LAKE CHARLES, LA. 70602 Ms. Diana Buck Enforcement Branch U.S. Environmental Protection Agency 1445 Ross Avenue, Ste. 1200 Dallas, TX 75202 Re: Notification of Unanticipated Bypass of Treatment (NPDES Permit No. LA0000761) Dear Ms. Buck: Due to unforeseen circumstances, fouling of our Steam Strippers' feed filtering system resulted in a bypass of treatment on December 23, 1988. Your office, as well as the Louisiana Department of Environmental Quality - Water Division were notified by phone on that date. While emergency repairs were being performed on the treatment units, the lift stations comprising the wastewater collection system overflowed to Outfall 301. All non-essential systems generating wastewater were temporarily shut down during the loss of treatment, as indicated in the attached report from operating personnel. Also attached is their estimate of additional volatile chlorinated hydrocarbons discharged as a result of the bypass. If you require additional information on this matter, please call me at (318) 491-4450. Respectfully, Mark W. Wood Associate Research Chemist 155MWW/vc cc: Mr. Frank Dautriel (La. DEQT bcc: WASTEWATER COLLECTION SYSTEM BYPASS CALCULATIONS cpnfljrtiang Before bypass: All flow reaching Outfall 301 was pumped to treatment - an average of 120 gal./min. consisting of blowdowns and other non-process wastewater. The system also collects/treats "first-flush" stormwater. Highflow condition is not treated. During bypass: Outfall 301 pumps were shut down and all process wastewater collection sumps overflowed through Outfall 301. Time Rate C1HC Cone.ppm a. 0230-0245 4920 88 b. 0245-0315 5820 104 C. 0315*-0930** Calculations 300 185 gal/min x minutes x 8.43 lb/gal x ppm/106 * lbs ClHCs H O i a\ !1 a. 4920 X 15 X 88 X 8.43 X b. 5820 X 30 X 104 X 8.43 X 10~6 c. 300 X 375 X 185 X 8.43 X 10"6 = Total Diversion due to Bypass 55 lbs 153 lbs 175 lbs 383 lbs Water reduction effected Lift stations returned to treatment 0A5777 SL