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1CV'V' <br /> l A S S O C I A T E S I N C <br /> soil borings SB9, MW4, MWS, MW6, and MW7 were advanced to evaluate the horizontal extent <br /> of Impacted soil and bonngs MW4, MWS, MW6, and NM7 were completed as groundwater <br /> momtonng wells <br /> ' A field geologist logged drill cuttings and soil samples utilizing the Urnfied Soil Classification <br /> System Descriptions of soil types encountered and sample collection intervals are included on <br /> the boring logs contained in Appendix A and monitoring well construction logs contained In <br /> Appendix C <br /> ' The cored soil samples were collected at five foot intervals or significant changes in lithology <br /> using a 2-inch diameter split-spoon sampler containing three brass tubes The cored samples and <br /> drill cuttings were characterized for soil type, moisture content, and visual evidence of petroleum <br /> ' hydrocarbons A flame iomzatlon detection meter (FID) was used as a field screening device for <br /> the detection of petroleum hydrocarbon vapors in drill cuttings and cored samples Drill cuttings <br /> ' were temporarily stored on site in 55-gallon DOT approved steel drums On Apn129, 1998, ATC <br /> transported and disposed of 20 drums of soil at the Forward Landfill In Stockton, Cahforma <br /> Non-hazardous waste manifests are contained in Attachment G <br /> 2.3 Soil Sample-Analysis <br /> ' Selected soil samples were placed on ice, and transported under chain-of-custody to American <br /> Environment Network (AEN) laboratory (DHS #1172) for analysis All soil samples were <br /> ' analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX) utilizing EPA 8015 and 8020 methodologies, oxygenate fuel additives <br /> ' utilizing EPA 8260 methodology, and total lead The analytical results for soil samples are <br /> summarized in Table 1 Laboratory data sheets and chain-of-custody documentation are included <br /> in Appendix B <br /> t2.4 Groundwater Monitoring Well Construction <br /> Soil borings MW4, MWS, MW6, and MW7 were subsequently completed as groundwater <br /> monitoring wells to assess impacted groundwater beneath the site, and to provide additional <br /> ' measurement points for the determination of groundwater flow direction and hydraulic gradient <br /> Each well was constructed with 2-inch PVC casing The screened interval of each well was <br /> ' positioned from approximately 5 feet above to 15 feet below the encountered water table to allow <br /> for seasonal water level fluctuations The screen slot size Is 0 020-Inch Well construction details <br /> are depicted on the well logs(Appendix C) <br /> w 162596Veports\pluipm doc 3 <br /> 1 <br />