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I <br /> I <br /> f <br /> + <br /> n � � <br /> i Project No 58080-06-02 <br /> May 5, 1995 <br />' TPHg was detected in borings GB-6, GB-7, GB-8, GB-9 and GB-10 at concentrations ranging from <br /> 15 to 6,700 mg/kg with the majority of TPHg detected in the 25 foot sample interval With the <br /> exception of 15 mg/kg of TPHg detected at the depth of approximately 50 vertical feet bgs in boring <br /> GB-6, all other TPHg was detected between the depths of 15 and 35 feet bgs The calculated <br />' distance of 50 vertical feet bgs for the sample collected from boring GB-6 accounts for the 30° slant <br /> boring The laboratory reports for TPHg indicate that for those soil samples with detectable <br /> hydrocarbons, the chromatogram pattern is one of"unidentified hydrocarbons" with a carbon range <br /> greater than C, The chromatograms indicate that the gasoline hydrocarbons present in soil are <br />' highly weathered and degraded <br />' TPHd was detected in borings GB-8 and GB-10 at concentrations ranging from 20 to 4I0 mg/kg <br /> and is present between the depths of 15 and 35 feet bgs for GB-8 and 25 and 35 feet bgs for GB-10 <br /> Similar to samples tested for TPHg, the laboratory reports for TPHd indicate that for those soil <br /> samples with detectable hydrocarbons, the chromatogram pattern is one of "unidentified <br /> hydrocarbons" with a carbon range from C,to Ci4 The chromatograms indicate that the diesel fuel <br /> hydrocarbons present in soil are highly weathered and degraded <br /> MTBE was not detected in any of the soil samples tested <br /> 3 5 Groundwater Analytical Results <br /> I <br /> I <br />' Groundwater samples collected from MW-I through MW-5 were tested for the presence of TPHg, <br /> TPHd,' BTEX, MTBE and VOC's A cumulative summary of groundwater analytical data is <br /> presented,in Table V Copies of laboratory reports and chain-of-custody records are included in <br /> Appendix C Dissolved TPHg reported as weathered gasoline was detected in upgradient monitoring <br />' well MW-5 and onsite well MW-3 at concentrations of 88 ug/L and 250 ug/L, respectively TPHg <br /> was not detected in wells MW-1, MW-2 and MW-4 <br /> -18- <br />