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�J 14 Marley caaww rednogies The Resources Agency Department of Fish and Game Sacramento Valley - Central Sierra Region P.O. Box 30543 Stockton, CA 95213 Attn: Lori Oldfather Fish and Game Warden Re: Fish kill in the Stockton Diverting Canal Marley Cooling Technologies 150 North Sinclair Ave. Stockton, CA 95215 209465-3451 Fax 209.464-8059 September 20, 2002 Marley operates a ground water pump and treat system (an Ion Exchange and Electro Chemical Precipitation system), and discharges to the Stockton Diverting Canal under an NPDES permit issued by the California Regional Water Quality Control Board. In order to ensure the proper pH of the water discharged into the canal, the system is equipped with a pH probe and meter which determines the effluent pH level and then activates pH adjustment pumps in the event the pH level is outside the appropriate range. In addition, the system will be completely shut down (and effluent stopped) in the event too high of a pH level is detected. On Tuesday morning September 17, we arrived to find that the effluent PH meter signal was sending a constant and false "low pH" signal to the pH adjustment pumps. This in turn had caused the caustic pH adjustment pump to operate despite the fact that the actual pH level was not low. Moreover, because the meter signal was "frozen" and sending a false "low pH" signal, it did not activate the system shutdown feature as it was - designed to do. We undertook immediately to correct this condition. Repairs made by resetting and recalibrating the pH probe and meter Additionally, the caustic pump was replaced. The system was restored and operating within permit conditions at approximately 7:OOpm that day. On Thursday afternoon, September 19, we were contacted by the Department of Fish and Game and told that the pH in the canal was 9.2 and that there had been a fish kill. Although our system was operating within limits, we immediately turned all pumps off until further notice, and called the Water Board to notify them of the situation. We have contacted a local environmental services company to come out today and assess the discharge location and provide clean up services. Additionally, we have contacted our electronic equipment service vendor and they will have a technician out today to asses the pH meter condition. They will also have an engineer here on Monday the 23rd to assist with the placement of