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a <br /> A S S O C I A T E S I N C <br /> �,. Native soil in borings SB6 through SB9, located on the northwestern portion of the property <br /> primarily consisted of clay (CL) and/or silt (ML) in the upper 20 feet of the soil column. Below <br /> ' 20 feet bgs, soils consisted primarily of sand (SM to SW) although an apparent discontinuous <br /> L layer of fine soil (CL to MH) was observed in SB5 and SB7 between 31.5 to 36.5 feet bgs. <br /> Additionally, gravel (GM) was observed in sail boring SB7 between 26.5 and 31.5 feet bgs. <br /> L <br /> 3_2 Hydrogeology <br /> Groundwater was not encountered during field activities. According to Mr. Jeff Wong of <br /> PHS/EHD, depth to water at the site is believed to be approximately 90 feet bgs and is estimated <br /> to flow in an eastward direction. <br /> 4.0 ANALYTICAL RESULTS <br /> 4.1 Soil Analytical Results <br /> Remote Fill Pipeline and Diesel Tanks <br /> ✓ The laboratory reported that none of the soil samples collected in the vicinity of the former diesel <br /> USTs or the remote fill pipeline contained aromatic petroleum hydrocarbon constituents (BTEX) <br /> above laboratory detection limits. <br /> Soil samples collected from borings SB 1, SB2, and SB3 did contain detectable concentrations of <br /> TPHd. SB 1 and SB2 contained concentrations of TPHd ranging from <1.0 to 7.5 ppm, however <br /> the chromatogram pattern indicated the presence of an unidentified hydrocarbon (C9-C24) and <br /> discrete peaks (@C20, C24). These TPHd concentrations appear to increase relative to depth <br /> bgs. According to Mr. Kayvon Kimyai, Project Manager of Sequoia Analytical, these <br /> chromatograms do not match that of a fresh diesel standard and the discrete peaks observed may <br /> or may not be naturally occurring organic in the soil. Mr. Kimyai stated that additional analyses <br /> would be required to perform further quantification. <br /> TPHd was observed above laboratory detection limits in soil samples collected from SB3. TPHd <br /> 4 concentrations ranged from' 6,700 pprA at 15.5 feet bgs to < 5.0 ppm at 35.5 feet bgs suggesting <br /> that TPHd attenuates rapidly relative to depth. No analytes were detected above laboratory <br /> detection limits in soil samples analyzed from borings SB4 or SB5. <br /> Gasoline Tanks <br /> Of the fourteen soil samples collected from the vicinity of the former gasoline USTs, none were <br /> reported by the laboratory to contain TPHg, BTEX, or fuel oxygenates above laboratory <br /> detection limits. <br /> w:1172921repoMs sumwc1.doc 5 <br /> �.r <br />