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K L E I NFEL1) ER <br /> in GP-2 Sandy silts were present in boring B-2 at depths of 42 to 45 feet bgs The groundwater <br /> i sample collected from GP-2 was the only push probe groundwater sample that contained no <br />' detectable petroleum constituents Review of the llthology from the recent push probe <br /> assessment (June 2000) and June and July 2000 groundwater sampling results do not point to a <br /> definitive association of preferential contaminant pathways and uneven distribution patterns to <br /> 1 the north and northwest Silt and sand lenses may contribute to higher petroleum concentrations <br /> near MW-1 (since B-2 has coarser material in proximity to MW-1), but review of the boring log <br />' of boring MW-1 showed predominantly clay in the water bearing zone <br /> The highest concentrations of petroleum constituents besides MW-1 was noted from push probe <br />' location GP-5 and monitoring well MW-2, which are up-gradient from the former UST location <br /> Sands and silty sands were encountered during the advancement of GP-5 Silty clays were noted <br /> by Krazan on the soil log of MW-2 Silty sands were also described in the water bearing zone on <br />' soil logs from Boring B-3 located dust northwest of MW-2 Based upon this lithology and <br /> analytical results (Table 1) it appears that a preferential contaminant pathway may be possible <br /> (via coarser materials) in this direction which is generally up-gradient to cross gradient of the <br />' former UST These trends however in Kleinfelder's experience are not unusual as subsurface <br /> geology can be highly variable and cause expected contaminant distribution patterns to vary <br /> 1 <br /> 1 <br /> 20-4439-01 E01t2000R726 Page 13 of 17 <br />' Copynght 2000 Klemfelder Inc October 16,2000 <br />