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used from ground surface to 17 feet. The filter pack (#3 sand) was installed from 15 to 27 feet and a bentonite plug was installed from 12 to 15 feet The surface seal (Portland ' cement) was then installed from ground surface to 12 feet Bonng P-3 was dual-completed as extraction well VE-3 and IAS observation well ASO-2 ' VE-3 was completed using 2-inch diameter 0 020-inch slotted PVC casing from 5 to 20 feet and 2-inch diameter blank PVC casing from ground surface to 5 feet Well ASO-3 was completed using 2-inch 0 020-inch slotted PVC casing from 17 to 27 feet and blank PVC screen from ground surface to 17 feet The filter pack (#3 sand) was then installed from 3 to 27 feet and a bentonite plug was installed from 0 5 to 3 feet Cement was then used from the surface to a depth of 0 5 feet ' Boring P-4 was completed as extraction %%ell VE-2 using 4-inch diameter 0 020-inch slotted j PVC casing from 5 to 20 feet and blank PVC casing from ground surface to 5 feet (vertical ' depths) The filter pack was installed from 3 to 20 feet and a bentonite plug was installed from 0 5 to 3 feet Cement was then used from the surface to 0 5 feet ' Boring AS-1 was completed as an IAS injection well using 2-inch diameter 0 020-inch slotted PVC casing froin 28 to 38 feet and blank PVC casing from ground surface to 2S feet The filter pack was installed from 26 to 38 feet and a bentonite plug was installed fiom 23 to 26 ' feet The surface seal (Poitland Cement) was then installed to a depth of 23 feet Boring logs for P-1 through P-4 and AS-1 aie included in Appendix A 3.4 Laboratory Results of Soil Samples A total of eight sort samples frons P-1 thiough P-4 and AS-1 \\ere submitted to Westein ' Enviionniental Science and Technologies (WEST) in Davis, California for all Each sample was analyzed for TPH as gasoline and BTESX in accoidance with EPA methods ' 80151n and 8020, respectively Concentrations of TPH as gasoline ianaed fiom 19 ppm (P-4-15') to 5,900 ppm (P-3-15'), purgeable aromatics ranged fiom 0 026 ppm (ethylbenzene, AS1-10') to 180 ppm (xylenes, ' P-3-15') The laboratory iesults aie summarized in Table 1 The laboratory report and chain-of-custody are included in Appendix B 35 Quartei ly Groundwater Monitoring, January 1995 ' 3.5.1 11'lonitoi ing Procedures Quaiterly groundwater monitoring pioceduies were performed at the site on January 12, ' 1995 The groundwater depth was measured in each monitoring well using a Solinst water level meter Free hydrocarbon product was encounteied in MW-1 and MW-4, therefore a Keck water-product interface probe was used to determine product thickness The groundwater depths were also measured in ASO-1, ASO-2 and ASO-3 (Table 2) Ceobyo]MAI Serv.-u,!i c C WIN FRT 9W 94 t:10 602