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CRYSTAL CREAM& BUTTER COMPANY <br /> WKA No 1628 07 <br /> June 5, 1996 <br /> Page 3 <br /> The site diagram presented as Plate 4 shows historic concentrations of gasoline and benzene in the <br /> groundwater beneath the former UST In general, the contamination appears to be limited to the <br /> site boundaries with a noticeable exception to the north at monitoring well MW5 The last two <br /> quarterly sampling events have revealed increased gasoline and benzene concentrations in MW1, <br /> MW4 and MW5 This may indicate a localized northerly or northwesterly component to the <br /> general northeasterly flow direction Please refer to Plates 3 and 4 as well as Table I <br /> Soil Boring Investigation N S <br /> A total of five soil borings will be drilled in the vicinity of the former 10,000-gallon underground <br /> fuel tank location to further evaluate potential subsurface soil contamination <br /> . Two soil bonngs will be drilled to an anticipated depth of 20 feet below surface grade using a <br /> truck-mounted drill rig equipped with 6-Inch diameter hollow-stem augers Two soil borings will <br /> be drilled to an anticipated depth of 30 feet below surface grade and one boring will be drilled to <br /> an anticipated depth of 40 feet below surface grade using a truck-mounted drill ng equipped with <br /> 8-inch and 10-inch diameter hollow-stem augers <br /> Soil samples will be obtained at maximum intervals of five feet and at changes in lithology, using a <br /> modified California sampler equipped with clean, two-Inch diameter, six-inch long brass tubes, <br /> samples and drill cuttings will be described in the field using the Unified Soil Classification System <br /> (USCS) The samples will be screened In the field with a photoionization detector (PID) to <br /> evaluate potential hydrocarbon content and to assist in selecting soil samples for laboratory <br /> analysis, if warranted The sample tubes will be sealed with Teflon sheets and plastic end caps to <br /> reduce volatile hydrocarbon loss The soil samples will be stored In an ice chest containing ice <br /> and submitted under chain-of-custody to a California-certified laboratory for analysis of Total <br /> Petroleum Hydrocarbons as gasoline using Modified EPA method 8015 and Benzene, Toluene, <br /> Ethylbenzene, and Xylenes (BTEX) using EPA method 8020 <br /> WALLACE KUHL <br /> Recyded paper 6 ASSOCIATES INC <br />