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Beacon Station No 641 December 8, 1997 <br /> Stockton—Lahfomia ArldifinnnI IQu c v ti ion Repo <br /> analyses Upon completion of drilling, a groundwater monitoring well (MW-1) and two <br /> vapor extraction wells (V W-1 and VW-2) were installed in soil boring B-2, and two nested <br />' soil vapor extraction wells (VW-3 and VW-4) were installed in soil boring B-1 <br /> The dell cuttings generated during this work phase were screened with an OVM, and four <br />' soil samples were collected from the stockpiled cuttings, composited at the laboratory and <br /> analyzed for gasoline-range hydrocarbons and lead (Table 1) All cuttings generated during <br />' this phase were stockpiled on and covered with visqueen sheeting until subsequent disposal <br /> by Ultramar <br />' Drilling.andSampling- Phase <br /> After completion of station remodeling and obtaining an off-site access agreement, the <br />' second phase of field work was conducted on September 11 and 12, 1997 A Horizon <br /> geologist observed the drilling of seven onsite soil borings and one offsite soil boring <br /> (Figure 2) The location of the borings were selected to attempt to evaluate the presence of <br /> gasoline-range hydrocarbons in the soil and groundwater beneath the site The borings were <br /> P} drilled and sampled using a truck-mounted drilling rig equipped with 8- and 10-inch <br /> diameter hollow-stem augers All Phase 2 drilling, sampling and well completion activities <br /> were performed by Woodward Drilling (Woodward), a C-57 licensed contractor from Rio <br /> Vista, California <br /> During drilling, soil samples were collected from each boring at five-foot intervals from the <br />' ground surface to the total depth of the boring Bonng SW-1 was not sampled due to its <br /> proximity to boring MW-5 Soil borings dnlled through PVC conductor casings (MW-5, <br /> SW-1, VE-5NE-6, and VE-7NE-8) were sampled beginning at 20 feet bsg Soil samples <br /> and cuttings were evaluated for the presence of petroleum hydrocarbon vapors with an <br /> OVM Any evidence of petroleum hydrocarbons was recorded on the soil boring logs which <br /> contain soil descriptions and well completion data (Appendix C) Soil samples were <br /> contained in chilled storage for transport to the laboratory for the requested analyses Upon <br /> completion of drilling, groundwater monitoring wells were installed in soil borings MW-2, <br /> MW-3, MW-4 and MW-5 Soil borings VE-5/VE-6 and VE-7NE-8 were each completed <br /> 1641-13 rpt 4 HORIZON ENVIRONMENTAL INC <br />