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1 <br /> Geological Technics Inc. Page 3 <br /> Sinclair Trucking <br />' Report-Subsurface Investigation <br /> Project No.320.2 <br /> July 21,1999 <br /> ' <br /> 2.0 SITE GEOLOGY & HYDROGEOLOGY <br /> Geology <br /> Based on sediments recovered in the split spoon sampler, the soil profile of the site as <br /> observed in this borehole are summarized below: <br /> ■ 0 to 3.5 feet Road base and top soil <br /> ■ 3.5 to—11 feet Sandy silt <br />' ■ 11 to 11.5 feet Clay <br /> ■ 11.5 to 16 feet Sand, fine to coarse, gravelly (this unit is similar to the sand unit <br /> observed between±12-16 ft in the other boreholes) <br />' ■ 16 to 25+ feet Clay, dense, silty,hard <br /> The sediments containing clay fines exhibited varying degrees of plasticity from non-plastic <br /> and even friable to very plastic. The soil below a depth of ten feet was saturated. <br />' Hydreolog_v. <br /> On Feb 19, 1999, Del-Tech Geotechnical Support personnel measured the four monitoring <br />' wells for depth to groundwater. The average depth to water was measured to be <br /> approximately 11.21 feet from the top of casing measuring point. The groundwater gradient <br /> and bearing of flow were calculated to be 0.0003 ft/ft, flowing N79°E, respectively. This <br /> hydrologic behavior is consistent with previous groundwater gradients measured at this site. <br /> 3.0 SOIL TESTING & GROUNDWATER MONITORING <br /> Soil Testing <br /> Soil samples were tested from five depth intervals for BTEX by method 8020, TPH-G by <br />' method 8015m, and the five Oxygenated Fuel Compounds (OFCs) by method 8260. The <br /> laboratory data sheets, attached in Appendix A, give the detection limits and test results.. <br /> The results showed the following: <br />' ■ 8.5 to 9 feet low concentrations of BTEX & TPH-G, no OFCs <br /> ■ 13.5 to 14 feet elevated concentrations of BTEX & TPH-G, no OFCs <br /> ■ 16.5 to 17 feet no BTEX, TPH-G, or OFCs <br />' ■ 18.5 to 19 feet no BTEX, TPH-G, or OFCs <br /> ■ 24 to 24.5 feet no BTEX, TPH-G, or OFCs <br />' Groundwater Monitodn <br /> The four-groundwater monitoring wells and one domestic well were monitored on Feb 19, <br /> 1999. The laboratory data sheets attached in Appendix give the detection limits and test <br /> results. The field logs are attached in Appendix B. <br /> The results showed the following: <br /> ■ MW-1 low concentrations of BTEX & TPH-G, no OFCs <br />' ■ MW-2 no BTEX, TPH-G, or OFCs <br /> ■ MW-3 no BTEX, TPH-G, or OFCs <br /> ■ MW-4 low concentrations of BTEX & TPH-G, no OFCs <br />