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404 WEST FREMONT <br /> WKA No 1628 01 <br /> February 25, 1993 <br /> Page 5 <br />' FIELD INVESTIGATION <br />' To evaluate the vertical and lateral extent of contaminated soil and ground water in the vicinity of <br /> the former underground fuel tank, three soil borings (MW2 through MW4) were drilled on the <br /> site at the locations shown on Plate 2 The borings were drilled using a Mobile B61 drill rig <br />' provided by B & F Drilling to a depth of 40 feet and converted into four-inch monitoring wells <br /> A total of nine soil boring samples and four ground water samples were collected from the new <br /> wells and previously existing well MW 1 The samples were tested for Total Petroleum <br /> ' Hydrocarbons (TPH) as gasoline, using modified EPA test method 8015 and Benzene, Toluene, <br /> Ethylbenzene, and Total Xylenes (BTEX), using EPA test method 8020 The water sample from <br /> ' well MW1 was additionally tested for TPH as diesel Logs and well construction diagrams for <br /> wells MW2 through MW4 are provided on Plates 4 through 7, a detailed description of drilhng, <br /> sampling and well construction procedures is contained in Appendix A <br /> iSoil conditions <br /> Soil types encountered immediately beneath the site were brown and grey clays and silts to a <br /> depth of approximately 20 feet The clays and silts were underlain from a depth of 20 to 35 feet <br /> ' t)y a grey and tan silty and gravelly sand, the sand was underlain by a grey clay which extended <br /> to the total depth of the borings, 40 feet <br /> Test results revealed no detectable TPH as gasoline or BTEX in the soil samples collected during <br /> drilling of the wells A summary of test results for the soil samples is included as Table 2 <br /> ' Complete laboratory reports and chain-of-custody documents for the soil samples are included in <br /> Appendix B <br /> ' WALE :(U:IL <br /> S ASSOCIATES INC <br />