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INFORMATION SHEET <br /> THE MARLEY COOLING TOWER COMPANY <br /> STOCKTON, SAM JOAQUIN COUNTY <br /> The Marley Cooling Tower Company (MCTC) owns a wood treatment <br /> Facility for the purpose of fabricating cooling towers in the <br /> East Stockton Area. The primary chemicals used in their wood <br /> treatment process are chromium and copper. In the past, arsenic <br /> was also used in the wood treatment solutions but its use was <br /> discontinued in 1982 . <br /> The site is divided into two areas, the North Yard and the South <br /> Yard. Presently, all rainfall runoff falling on the North yard is <br /> collected in a stormwater pond. All wood treatment activities and <br /> storage of treated products are performed on North Yard. <br /> Therefore, any rainfall runoff contacting treated products stored <br /> on the North Yard becomes contaminated with wood treatment <br /> chemicals and must be treated before it can be released. <br /> Therefore, MCTC proposes to remove the contaminants through use <br /> of an ion exchange treatment system prior to discharge to the <br /> Stockton Diverting Canal. The proposed discharge limits for <br /> arsenic, copper and chromium are all 0. 05 mg/l . <br /> As part of an effort to mitigate ground water contamination in <br /> the North Yard, MCTC proposes to treat groundwater taken from <br /> extraction wells at the site. The ground water will be treated <br /> with the same treatment process used for treating the <br /> contaminated storm water runoff. Discharge limits for <br /> constituents in the ground water will be the same as those <br /> proposed for the treated storm water. <br /> Therefore, runoff from this area is carried off-site by a storm <br /> water drain system without containment or treatment. This was <br /> allowed since the South Yard is intended to be used for <br /> fabrication of non-treated cooling tower components and storage <br /> of "clean" products. However, recent soils analyses collected <br /> from the storm water ditches leaving the South Yard has shown the <br /> presence of relatively low levels of wood treatment chemicals. It <br /> was determined that these levels were due to temporary storage of <br /> treated wood components prior to shipment. MCTC has discontinued <br /> this practice and has also initiated cleanup of any residual <br /> contaminants now present in the South Yard. <br /> Allowing MCTC to discharge treated storm water off-site will <br /> enable them to initiate the measures necessary to remediate the <br /> contamination which is required under the Settlement Agreement <br /> signed by the Discharger, The Department of Health Services, and <br /> the Board. <br /> 6/15/87:REF <br />