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INFORMATION SHEET <br /> MARLEY COOLING TOWER COMPANY <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> Facility Description and Discharges <br /> The Marley Cooling Tower Company (MCTC) owns a cooling tower fabrication plant <br /> in the east Stockton area. As part of the fabrication process, MCTC operated <br /> a wood treatment facility at the site. The primary chemicals used in the wood <br /> treatment process were copper and chromium. Arsenic was also used in the wood <br /> treatment solutions until 1982. <br /> The site is divided into two areas, the North and South Yards. All wood <br /> treating activities were performed and all treated products were stored in the <br /> North Yard. <br /> Rainfall contacting the North Yard becomes contaminated with wood treatment <br /> chemicals. MCTC has implemented controls to reduce rainfall contamination and <br /> contain all runoff in the North Yard. Previously, all contaminated stormwater <br /> from the North Yard was discharged to an on-site holding pond for evaporation <br /> and infiltration. Contaminated stormwater is now conveyed to an on-site <br /> treatment plant before discharge to the Stockton Diverting Canal . <br /> The South Yard is used for fabrication and storage of not treated cooling <br /> tower components. Stormwater from the South Yard was discharged directly to <br /> the local drainage ditch system. Soil analysis results from stormwater <br /> ditches adjacent to the South Yard have shown the presence of wood treatment <br /> chemicals, due to past temporary storage of treated components prior to <br /> shipment. MCTC has initiated cleanup of residual contamination in the South <br /> Yard and storm water runoff is collected in a storm drain system and <br /> discharged to the treatment plant in the northeastern portion of the site. <br /> Past operational practices by MCTC have resulted in soil and ground water <br /> contamination by wood treatment chemicals. Solids beneath the wood treatment <br /> retort contain elevated levels of copper, chromium, and arsenic. Underlying <br /> ground water has been contaminated with chromium and copper. Ground water <br /> contamination exceeding the federal drinking water standard for chromium of <br /> 50 ug/l extends approximately 1000 feet off-site to the southwest. First <br /> ground water is approximately 40 feet below ground surface. The depth of <br /> ground water contamination extends to approximately 200 feet. <br /> In October 1987, MCTC initiated interim ground water remediation. This <br /> interim remedial action has been operating under Order No. 91-035 (NDPES <br /> No. CA00817887) . MCTC is presently permitted to discharge up to 0.59 mgd of <br /> treated stormwater and ground water to the Stockton Diverting Canal , tributary <br /> to the Calaveras River. <br /> The Stockton Diverting Canal is an engineering drainage way connecting Upper <br /> Mormon Slough to the Calaveras River near the Southern Pacific Railroad <br />