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Feasibility Study Report <br /> . 1140 W Hammer Lane, Stockton, CA <br /> defining the vertical and lateral extent of soil and groundwater contarrunation Soil boring and <br /> monitoring well locations are shown on Figure 4 Soil analytical results are summarized in Table 2 <br /> WaterWork Corporation (WaterWork) was subcontracted by Telic Engineering in 1989 to continue <br /> the subsurface investigation On October 12, 1989, WaterWork dialled four soil borings (SB12 <br /> through SB 15) to further assess the site stratigraphy and extent of soil contamination An additional <br /> I monitoring well (MW8) was installed on January 25, 1991 Analytical results of soil and groundwater <br /> samples collected to date are summarized in Tables 2 and 3, respectively Groundwater monitonng <br />! data are summanzed in Table 4 Soil bonng and groundwater monitoring well locations are shown on <br /> Figure 4 Well/bonng logs are included in Appendix A Well construction details are included m Table <br /> 1 5 <br /> I43 Excavation Activities <br /> In January 1990, approximately 3,000 cubic yards of contaminated soil was excavated from beneath <br /> Ithe farmer USTs Excavation proceeded to a depth of approximately 35 to 40 feet below grade <br /> Confirmation sail samples collected from the excavation floor (January 3, 1990) indicated residual <br /> Ipetroleum hydrocarbons remained in place at depths below 35 feet Confirmation samples collected <br /> from the excavation sidewalls (September 19, 1990) indicated that the lateral limits of soil <br /> Icontamination had been removed Soil analytical results are summarized in Table 2 Soil sample <br /> locations are shown on Figure 5 <br /> I <br /> Excavated soils were stockpiled onsite and aerated under the authorization of the San Joaquin Valley <br /> Air Pollution Control District (APCD) Aerated soils were confirmed clean through laboratory <br /> analyses and subsequently backfilled into the excavation under the authorization of PHS/EHD <br /> 1 <br /> 44 Groundwater Pumping Test <br /> RESNA Industries, Inc (RESNA) performed a pumping test the shallow aquifer beneath the site on <br /> December 16 and 17, 1993 The objective of the pumping test was to assess the hydrologic <br />' parameters at the site as an aid in the evaluation of possible remedial options <br /> G Ibntn\GR0UNDZC1KN0WLFS HAMIREP0RTSIrcaaibildyRepot1 dog <br />' 4 <br />