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WASTE DISCHARGE REQUIREMENTS -3- <br /> JOHNS-MANVILLE MANUFACTURING COMPANY, INCORPORATED <br /> FORMOSA PLASTICS, USA <br /> SAN JOAQUIN COUNTY <br /> "hazardous" under Title 22 of CCR. However, because these wastes do not pose a <br /> threat to ground water quality, Section 25143.7 of the Health and Safety Code permits <br /> their disposal in any landfill which has WDRs that specifically permit the discharge, <br /> provided that the wastes are handled and disposed of in accordance with other applicable <br /> state and federal statutes and regulations. <br /> 13. The surface impoundments accepted approximately 8000 cu. yds. of waste per year. <br /> When nearly full, the impoundments were dredged, and the material placed in one of the <br /> landfills. This occurred about every 2 years. The landfills contain the following <br /> approximate amounts of material: <br /> Landfill Volume of waste <br /> A 125,000 cu. yds. <br /> B 47,000 cu. yds. <br /> C 47,000 cu. yds. <br /> D 23,000 cu. yds. <br /> E <br /> F 24,000 cu. yds. <br /> G 36,000 cu. yds. <br /> H 22,000 cu. yds. <br /> I 27,000 cu. yds. <br /> J 55,000 cu. yds. <br /> K 77,000 cu. yds. <br /> L <br /> * sections E and L overlap and no determination of each one's capacity has been <br /> made. Together they contain approximately 38,000 cu. yds. of waste. <br /> GEOLOGY <br /> 14. The landfill is underlain by unconsolidated sediments of the Victor, Laguna, Mehrten, <br /> and Valley Springs Formations. The Victor Formation is approximately 120 feet thick, <br /> consisting of clays and silty sands. The predominant soil type is the Stockton Adobe <br /> Clay, with a depth of approximately 30 inches. Under the surface soils are interbedded <br /> silty clays and silty sands to a depth of at least 40 feet. <br /> 15. The closest known potentially active fault in the vicinity of the site is the Tracy-Stockton <br /> fault, which passes approximately 2 miles north-northwest of the landfill. The last <br />