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' • • GEORGE DEUKMEJIAN, Go r <br /> STATE OF CALIFORNIA—HEALTH AND WELFARE AGENCY <br /> DEPARTMENT OF HEALTH SERVICES <br /> TOXIC SUBSTANCES CONTROL DIVISION <br /> NORTHERN CALIFORNIA SECTION <br /> 4250 POWER INN ROAD FACT SHEET �c` �,8 <br /> SACRAMENTO,CA 95626 I,C' <br /> (916)739-3145 ? � <br /> The Marley Cooling Tower Company �` I <br /> Stockton, CaliforniaD <br /> Closure of Surface Impoundment S'S �� <br /> The Marley Cooling Tower Company (MCTC) , (Stockton Plant) , has <br /> submitted a plan to close their hazardous waste surface <br /> impoundment (pond) at that location. <br /> Background: The MCTC prepares and chemically treats lumber that <br /> is used for the construction of cooling towers. The lumber is <br /> received, processed, treated, stored and shipped from the <br /> Stockton Plant, which is located at 150 North Sinclair Avenue. <br /> From 1966 until 1982, chromated copper aresenate was used to <br /> treat the wood. Presently, MCTC uses acid copper-chromate in <br /> this process. These chemicals can be hazardous to human health <br /> because of their effects on internal organs and the nervous <br /> system. The major hazardous waste generated results from those <br /> wood treatment chemicals that accumulate in the yard. These <br /> contaminants are picked up by the rainwater. The contaminated <br /> rainwater is presently captured in an underground drainage system <br /> and is then pumped into a surface impoundment (pond) that is <br /> approximately two acres in size. <br /> Tunes and Disposition of Waste: In the past, the contaminated <br /> rainwater was processed by placing it in the surface impoundment <br /> and allowing the liquid to evaporate. The resultant sludge was <br /> periodically removed and disposed of in an off-site, authorized <br /> disposal area. <br /> In the future, the contaminated rainwater will be processed <br /> through a newly constructed water treatment plant. The water <br /> treatment system is designed to remove contaminants from the <br /> water. The contaminants will then be recycled into new batches <br /> of the wood treatment solutions. <br /> Closure of the Surface Impoundment: The surface impoundment will <br /> be closed in two steps. First, the liquids from the pond will be <br /> pumped through the water treatment plant. The most highly <br /> contaminated sludge and soil will be removed from the pond and <br /> will be disposed of in an approved, off-site disposal area. The <br /> bottom of the pond will be graded and compacted so that rainwater <br /> falling in the pond can be rapidly collected and pumped through <br /> the water treatment plant. This first step of the pond closure <br /> will eliminate the pond liquids and sludges. This will also <br /> remove the pressure created by the weight of the liquids that <br /> would force the hazardous chemicals further into the soil . <br />