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EMU` W---8_� 0w "M, <br /> n , <br /> , <br /> Y'A <br /> 1= <br /> Mr. John Randall <br /> April 20, 1990 <br /> Page 4 <br /> Two samples were taken from Stockpile A, and 10 samples from <br /> Stockpile B. See figure 2 for approximate locations of the <br /> Stockpiles and the sampling grid. The samples were collected <br /> sm from approximately 6-inches below the surface of the piles in <br /> 2-inch by 6-inch brass tubes, sealed irk foil, capped, taped, <br /> labeled and transported on ice to a state of California-certified <br /> laboratory. The samples were analyzed for benzene, toluene, <br /> ethylbenzene and xylenes (BTEX) , and for total petroleum <br /> hydrocarbons (TPH)-as-gasoline using modified U.S. Environmental <br /> Protection Agency (EPA) Methods 5020/ 8020/8015. See Table 2 for <br /> results of the sample analyses in tabulated form. The laboratory <br /> reports are attached. The analytical results ranged from 88 <br /> parts per million (ppm) to below detection levels (ND) . The <br /> Method Detection Limit (MDL) for TPH-as-gasoline is 10 ppm, <br /> In accordance with the above-meritioned work plan, Groundwater <br /> Technology recommends that soils contaminated with volatile <br /> hydrocarbons (Stockpile B) be aerated until hydrocarbon levels <br /> are reduced to below MDL, then used to backfill the excavation. <br /> In order to aerate these soils effectively, they should be spread <br /> over the area in the northwest corner of the site. Once analyzed <br /> to be below the MDL, these soils should then be u'`l to backfill <br /> the excavation. <br /> once the existing excavations have been backfilled with the <br /> aerated soil, three soil borings will be drilled on site., as <br /> described in the work plan. Borings wil3 be drilled with the <br /> --of---installin 4-inch-diameter-groundwater-moriitoring - --- -"- - <br /> wells. <br /> �J �iR1;�'SI111'AYFH <br />