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Statement of Facts <br /> Eldorado Chemical Company , Inc. <br /> Inground Hazardous Waste Storage Tank Closure <br /> EPA I.D. No. CAD089681068 <br /> Background: <br /> Eldorado Chemical Co. (ECC) is located at 1805 East Charter <br /> Way in Stockton, California (Figure I) . ECC is a batch <br /> blending operation that manufactures cleaning compounds, <br /> paint strippers, and detergents. The inventory of raw <br /> materials includes over two hundred different chemicals. The <br /> primary chemicals used are solvents and phenolic compounds. <br /> Wastewater is generated when the mixing tank is cleaned <br /> before use with a different product. Approximately 3 , 000 <br /> gallons of waste are generated each month. The waste is <br /> stored less than 90 days before it is transported to a <br /> licensed hazardous waste disposal facility. Between 1980 <br /> and 1987 , the wastewater was stored in an inground tank of <br /> approximately 8, 000 gallon capacity. The tank consists of <br /> three interconnected cells that are open on top. The cells <br /> are constructed of 1/4" steel. Most of the tank is below <br /> ground level; however, the top eighteen inches of the cells <br /> are above the ground and are imbedded in concrete. <br /> Wastewater was transported to the tank through a four inch <br /> diameter clay pipe. The pipe sections are five feet long <br /> and are connected by bell and spigot connectors. There is <br /> no discharge line from the tank. The tank was emptied by <br /> vacuum trucks which transported the wastewater to a licensed <br /> Class I disposal site. <br /> Closure Procedures: <br /> On May 5, 1987 , the tank was taken out of service. All <br /> waste was removed, and the tank was cleaned. The pipeline <br /> transporting waste to the tank was disconnected. <br /> In the draft Closure Plan, the tank and all associated <br /> piping, including underground piping in the manufacturing <br /> building, will be removed. The tank will be disposed of at <br /> a Class II or Class III disposal facility. The piping and <br /> all contaminated soil will be disposed of at a Class I <br /> disposal site. Soil samples will be collected and analyzed <br /> to insure that no contaminants remain at levels that pose a <br /> hazard to human health and safety or the environment. The <br /> excavated area will be filled with clean soil. <br /> Regulatory Basis: <br /> The tank and associated piping will be closed in strict <br /> accordance with the applicable regulations contained in both <br /> Title 22 , California Code of Regulations, and Code of Federal <br /> Regulations, Title 40 (40 CFR) , Part 265 . <br />