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11 <br /> ;Former Discovery Chevy January 27, 1998 <br /> Tracy.,California Additional ub urface Investigation Work Plan <br /> Hand borings SA through SK were drilled around and in the former UST excavation by <br /> i <br /> Horizon personnel to a depth of approximately 8 feet bsg (see historical Figure 3 in <br /> .Appendix C). Selected soil samples collected from the hand borings were analyzed and <br /> i <br /> reported concentrations of gasoline hydrocarbons with the highest concentrations in hand <br /> borings SB and SK in the vicinity of the former product lines to the west of the former UST <br /> excavation. The TPHgBenzene results in boring SB at 8 feet bsg were 4,370/16.5 ppm. <br /> Boring SK was analyzed at 5 feet (6,110/15.7 ppm) and 8 feet (6,290/18.5 ppm) bsg (see i <br /> Horizon Table 1 and Figure 3 - Work Area in Appendix C). Results of this investigation <br /> were reported in Horizon's Report dated June 6, 1997. ` <br /> f <br /> G <br /> Quarterly groundwater monitoring has been performed at the site by GeoStrategies since I <br /> March 1995. During that time, hydrocarbon concentrations in groundwater had been <br /> reported primarily in monitoring wells MW-1 and MW-2. The groundwater flow direction <br /> has been consistently in a northern direction and groundwater levels have fluctuated between i. <br /> 10.9 and 9.25 feet bsg depending on the time of the year. Analytical tests of the <br /> i <br /> groundwater for MTBE and other oxygenates compounds have reported none of these <br /> compounds present(Table.3 - Groundwater Data in Appendix C). <br /> SCOPE OF WORK <br /> i <br /> The following work is proposed to assess and delineate soil and groundwater conditions as <br /> related to gasoline hydrocarbons. Field methods are described in Appendix B. <br /> II <br /> Task 1 <br /> i <br /> Obtain permits, prepare a site-specific safety plan, notify Underground Service Alert, and <br /> schedule subcontractors. <br /> i� <br /> u <br /> i <br /> ii <br /> 3001-13.wp 4 HORIZON ENVIRONMENTAL INC. f <br /> 1 <br />