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S The pH, temperature and specific conductivity of the groundwater were measured <br /> during the well purging phase The final measurements were compared with <br />! physical water quality data obtained during well development to ensure that <br /> aquifer water was inside the well casing before collecting samples a summaryof <br /> the field measurements during well purging Is presented In Appendix V The <br /> water samples were collected with hand held PVC disposable bailers and were <br /> collected in 40 milliliter vials without head space to avoid volatilization Sample <br /> 1 containers were labeled and chilled on Ice immediately after collection The <br /> groundwater samples were analyzed for petroleum hydrocarbon constituents <br /> TPHg, BTEX, 1,2-DCA , EDB, and Oxygenates by EPA Method 82606 Samples <br /> were analyzed by KlffAnalytical LLC In Davis, California, a Department of Health <br /> Services (DHS)-certified laboratory <br /> i <br /> 5.0 PHASE II FIELD INVESTIGATION RESULTS <br /> 5.1 Soils Encountered Underneath the Subject Property <br /> 1 The soils encountered at one and five foot depths, consisted of slightly moist, silty <br /> and clayey sand medium dark brown color. The soils encountered atthe nine foot <br /> depth was clean fine-grained sand, of medium brown color, saturated The section <br /> from eight to ten feet was in the capillary fringe Soils from twelve to seventeen <br /> • feet In depth, consist of medium light brown, loose, medium to coarse grained <br /> 1 sand, and a dense clay was encountered at a depth of from seventeen to twenty <br /> feet bgs This criteria was used relative to placement of the deep groundwater <br /> wells casing which was set a depth of twenty feet bgs within the clay zone <br /> 5.2 Laboratory Analytical Results (soils) <br /> 1 <br /> Select soli samples were analyzed for hydrocarbons, BTEX, Lead Scavangers and <br /> oxygenates by EPA method 82606 (See Scope of Work, Appendix VI) <br /> Laboratory analytical results showed detections of MTBE in the one monitoring <br /> i well placed on the subject property at a depth of 20 feet The soil sample had a <br /> concentration of MTBE of 0 037 parts per million (ppm) Samples were collected <br /> every five feet and analyzed every ten feet No other detections of MTBE were <br /> encountered in the soil samples analyzed. <br /> r <br /> r Avalon Environmental Consultants 9627-001-7 <br /> Joe's Truck Plaza 15600 S Harlan Road <br /> May 15,2002 Lathrop,California <br /> 7 <br /> r <br />