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Stockton Soil Treatment Facility <br /> DETAILED ENVIRONMENTAL ASSESSMENT <br /> This Detailed Environmental Assessment (DEA) addresses each <br /> environmental issue identified by an asterisk ( * ) in the Initial <br /> Study. For each topic, the environmental setting is established, <br /> environmental analysis is provided, and specific mitigation <br /> measures are proposed. <br /> 1 . Water <br /> Reduction of Ground Water Quality <br /> Setting: <br /> The project site is within an area of high ground water. <br /> Ground water monitoring reports filed quarterly with the <br /> Central Valley Regional Water Quality Control Board indicate <br /> that ground water levels are 10-25 feet below the ground <br /> surface. As proposed, the project will handle and process <br /> hydrocarbon-contaminated soils. The potential exists for <br /> these soils to come in contact with the ground surface which <br /> may cause percolation of the hydrocarbons into the water <br /> table during rainy weather or wash-down operations . <br /> Likewise, storm water runoff has the potential to pick up <br /> hydrocarbon-laden material for off-site transport to drain- <br /> age courses and waterways. During periods of heavy rain- <br /> fall , sheet flow across the contaminated soil stockpile area <br /> may carry contaminated particulates to adjacent drainage <br /> courses. <br /> There is an existing 16-inch diameter well on the project <br /> site that was utilized as part of the Tillie Lewis Cannery <br /> operation. This well will not be used by SSTF, and should <br /> be destroyed. <br /> Analysis: <br /> Contaminated soil will be transported to the project site by <br /> truck, where it will be unloaded from a ramped area to the <br /> contaminated soil stockpile (refer to Plant Layout Sheet) . <br /> Prior to treatment, the contaminated soil will be stored in <br /> the 160 ' x 180 ' stockpile area, with as much as 10 ,000 tons <br /> of contaminated soil placed in segregated piles. The stock- <br /> pile area is underlain by a high density polyethylene (HDPE) <br /> liner and a compacted clay sub-base which meets the require- <br /> ments of the California Code of Regulations, Title 23 , <br /> Division 3, Chapter 15 for Class II Waste Management Units. <br /> The contaminated soil material is proposed to be covered <br /> with plastic tarps, however, during windy, rainy condi- <br /> 19 <br />