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.JUL 18 '97 12:29PM COS -MUD ENGINEERING P.2/3 Caty of Stockton, Municipal U"m DepaMMU FAR'MEMO NAME Kesey Foky, Senior RE.H.S. DATE: A4 18,1997 FIRM: PHS-EHD TIME. Noon PBRSONMASINGCALL : Dime K. Hkaon, Rvalo ftryCOMWEmwe Of XV; City ofSnochton, MUD PHONE Ak 46&3433 -fax - SUBJECT.- PETROLEUM OILY WASTE WATER - SONORA & ORANGE STORMWA TER PUMPING STATION MESSAGE: On Wednesday, July 16, our stormwatsr pumping station on Sonora and Ofaage Streets was discovered to have a pchvietm substance floating, approximately an mach thick, on top of *c water. The pumping station had been out of service for 2 months whale maintenance crews workd on the pump. Consequently, nothing was discharged from the pumping station to a waterway. Our ExIvironmewal Control (EC) Ofters, Stifflef and Bulk, investigated our system Imes and noted that the petroleum oil first appeared in Ste msaway at 1340 Washiuguon Street, which is adj acent to botb California Cedar and McCormick and Haloes, downgradient to our pumping station by gravity flow. Samples were collected from the pumping station And the mauway w well as photographs taken. The following day, Thursday, July 17, O1Ti=8 Sti$tier and Baillic conducted a site inspection of California Cedar and noted that the Dnraflame production area bad undergone steamcleaning the preceeding day. Evidence of petroleum oily waft waw was in Cal•Cedar"s sump collect m system. Officer Slifer and Michael McDonald, MUD's Maintenance Supervisor, interviewed ihe project manager for the McCormick and Baxter site activity. There doeWt appear to be any stormwater drainage connection from the M & B site to our manway-, it had been disconnected several years ago. We arc currently awaiting the laboratory results (8-10 day turn -wound), and have contracted with Ramos Environmental Services to pump out the petroleum oily waste water from the station. Ramos is transporting the oily waste waxer to our Navy site and storing due liquid in (5) 24,000 gallon Baker Wanks. Uigposition of the waste will be determined following receipt of the laboratory results. Attached is a map of our pumping station and the associated impacted system lines. Samples were collected from points A & B. Call me if you have any questions.