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f <br /> Working To Restore Nature <br /> April 15, 1993 <br /> ARCO Facility No 6020, Manteca, California <br /> During sampling, a photoionization detector was used to characterize the relative levels of <br />' hydrocarbon vapors emitted by soil samples Readings recorded in the field are shown on <br /> the Logs of Borings Soil borings B-12 and B-13 were backfilled to grade with a <br /> cement/bentonite slurry A detailed description of drilling and soil sampling methods are <br /> presented in Appendix B <br /> Soil cuttings generated during the drilling of the soil borings were stockpiled on plastic and <br /> covered with plastic Four soil samples were collected from the soil pile and were submitted <br /> to the analytical laboratory to be composite into one sample and analyzed After the <br /> composite soil sample was analyzed, at the request of ARCO, Dillard Trucking of Byron, <br /> California, removed and disposed of the stockpiled soil Analytical results from stockpiles <br /> are presented on Table 2 <br /> Monitoring Well Construction <br /> On November 18 through 20 1992, Westex constructed monitoring wells MW-1 through <br /> MW-4 in borings B-8 through B-11, respectively Monitoring wells were constructed to <br /> evaluate the ground-water flow direction and whether hydrocarbons were present in ground <br /> water near suspected sources of hydrocarbons and at the margins of the site The locations <br /> of the monitoring wells are shown on Plate 2 Details of well construction are described in <br /> Appendix B, and the construction details of individual wells are depicted on the Logs of <br /> Borings <br /> 3ooss-s <br /> 5 <br />