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I GRANITE CONSTRUCTION WKA No 2088 07 April 7, 1995 Page 6 I ' The former diesel and gasoline UST excavations were lined with plastic and also backfilled following authorization from EHD The stockpiles of soil removed from the UST excavations ' were relocated to the locations shown on PIate 2 FIELD INVESTIGATION rAt the request of EHD and in accordance with our October 12, 1994 Soil and Ground Water Investigation Workplan, soil boring (B18) and monitoring wells (MW7 and MW8) were drilled ' on January 17, 1995 at the locations shown on Plate 3 The borings were drilled on January 17, 1995 by B & F Drilling using a Mobile B-61 drill rig equipped with 6-inch and 8-inch diameter hollow stem augers Soil boring B18 was advanced to a depth of approximately 20 feet below site grade, monitoring wells MW7 and MW8 were advanced to depths of approximately 40 feet below site grade Wells MW7 and MWS were installed with two-inch diameter schedule 40 PVC casing A detailed description of drilling, fsampling, and well construction procedures is contained in Appendix A A total of 12 soil samples and 8 ground water samples were collected from the soil boring, two newly constructed wells, and the six existing wells Selected samples were analyzed for Total Petroleum Hydrocarbons (TPH) as gasoline and diesel using EPA method 8015 Modified, Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) using EPA method 8020 and for Total Lead using EPA method 6010 ' Subsurface Soil Conditions IOne soil boring, B18, was drilled to a depth of 20 feet at the location shown on Plate 2 Subsurface soils encountered in soil boring B18 consisted of silty sand to a depth of at least 18 feet, underlain by a clayey silt to a depth of at least 20 feet Monitoring wells MW7 and MW8 were drilled to a depth of 40 feet below site grade Subsurface soils encountered in MW7 and WALLACE•KUHL Recycedpape, SASSOCIATES INC