FIELD DOCUMENTS AND WORK PLANS 1987

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STATE'7F E.AUFORNIA • • • GEORGE DEUKMEJIAN,Govern" CAeFORNIA REGIONAL WATER QUALITY CONTROL BOARD— CENTRAL VALLEY REGION 3443 ROUTIER ROAD SACRAMENTO,CA 95827-3098 29 January 1987 Mr. Ed Steffani , General Manager FEB 2 1Q97 Stockton East Water District P .O. Box 5157 ENVIRIJMENTAL HEALTH Stockton, CA 95205-0157 FERMIT/SERVICES MARLEY COOLING TOWER COMPANY, SAN JOAQUIN COUNTY This is a response to your 22 December 1986 letter to Ton Vorster in which you requested to be provided with a status report on the Regional Board's cleanup activities and the availability of ground water data compiled for the Marley Cooling Tower Company site. In response to your first request, a brief status report is presented below: Background Information The Marley Cooling Tower Stockton Plant is at 150 North Sinclair Avenue, Stockton, California. The Plant is divided into two areas designated the North and South Yards. The South Yard was purchased in 1942, and has been used as a wood storage and fabrication facility since that time. The North Yard was purchased in 1965 and has been as a wood storage and pressure preservative treating plant since that time. The access to the site is limited by a fence around the perimeter and the entire area is paved. A storm water retention pond was installed in 1966 to handle rainfall runoff in the North Yard. Wood treating by Marley began in the North Yard in the Fall , 1966. The process consists of placing the material to be treated in a long pressurized cylinder (retort) , flooding the retort with waterborne chemicals (containing chromium, copper, and arsenic) , holding the pressure until adequate preservative is injected , draining the retort, and removing the material . The initial treating solution was chromated copper arsenate which was changed to acid copper chromate in 1982.