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Working To Restore Nature <br /> monitoring wells within the uppermost aquifer. The bonng/well locations are shown on Plate <br /> 2 <br /> 1 <br /> 3.2 Soil Sampling and Analysis <br /> Dnlling was conducted by Spectrum Exploration, Inc. (C57# 512289) utilizing a hollow stem <br /> auger dnll ng. A field geologist continuously logged all dnll cuttings and cored soil samples <br /> ' utilizing the Unified Soil Classification System (Appendix 1). Descriptions of soil types <br /> encountered and sample collection intervals are included on the boring/well logs (Appendix I). <br /> Cored soil samples were collected at five foot intervals using a 2-inch diameter split-spoon <br /> ' sampler containing three brass tubes. The cored samples and drill cuttings were characterized <br /> for soil type, moisture content, and visual evidence of petroleum contamination. A photo <br /> ionization detection meter (PID) was used as a field screening device for the detection of <br /> petroleum hydrocarbon vapors in dnll cuttings and cored samples. Soil samples collected at <br /> ' approximately 5 and 10 feet below grade (the water table interface) were selected for <br /> laboratory analysis. <br /> ` Selected soil samples were placed on ice, and transported under chain-of-custody to Argon <br /> Mobile Labs (DHS #1873) for analysis. The samples were analyzed by Argon Mobile Labs <br /> ' for BTEX and TPHg utilizing EPA 8020 and 8015 methodologies, respectively. The <br /> analytical results for soil are summarized in Table 1, respective laboratory data sheets and <br /> ' chain-of-custody documentation are included in Appendix H. <br /> ' 3_3 Monitoring Well Construction <br /> Soil borings MW4, MWS, MW6, and MW7 were subsequently completed as groundwater <br /> ' monitoring wells to further assess the extent of groundwater contamination beneath the site, <br /> and to provide additional measurement points for the determination of groundwater flow <br /> direction and hydraulic gradient <br /> 1 <br /> Each well was constructed with 2-inch PVC casing. The screened interval of each well was <br /> ' positioned from approximately five feet above to 15 feet below the encountered water table to <br /> allow for seasonal water level fluctuations. The screen slot size is 0.010-inch. Well <br /> construction diagrams are depicted on the bonnglwell logs (Appendix I) � <br /> 1500911REPORTs\SR-0694 FNL <br /> 1 <br />