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fflq k k� 3.0 FIELD ACTIVITIES In general, the: field activities can be summarized by the follow- ing. A complete description of the field activitirc is contain,.d r' in Appendix A. During the time: period of December 5, 1988 through December 30, 1988, twelve soil boreholes and three monitoring wells were installed at the site (Figure 3) . From these installations, a total of thirty-three soil samples and three groundwater samples were collected. The soil and water samples collected were analyzed for the following parameters: t: o Benzene, Toluene, Xylene & Ethyl:ienzene (BTX&E) - EPA �» Method 8020 (soils) , METHOD 602 (water) o Total Petroleum Hydrocarbons (TPH) (light and heavy fractions) - EPA Method 8015 w o Organolead - Atomic Adsorption 4/ t (Note: In addition, any sample exhibiting detectable concentrations of organolead were analyzed for soluble lead) . .., 4.0 ANALYTICAL RESULTS W� The complete analytical reports for all samples collected are contained in Appendix B. The following sections summarize the analytical results of the soils and groundwater samples. ' w.. 4.1 Soil Samples A total of twelve boreholes were drilled at the site. From each borehole, soil samples were collected at 5' intervals and field screened using a HNu Photoion'.zer. The soil sampling effort is described in more detail in the Field Sanpling Report contained in Appendix A. Specific samples were selected for analysis based on the field screening measurements or the depths specified in the scope of work. At a minimum, two soil samples were collected from each borehole. Each sample identification number includes location number and depth (i.e. BH 3-25 = Borehole #3 at a 25, ei depth) . Soil samples were also collected prior to each well in$tallation from directly above the groundwater table. 1, l Table 2 presents a summary of the soil sample analytical results. only six soil samples from two boreholes (boreholes #3 and #4) exhibited detectable quantities of TPH. Five of these six samples also exhibited concentrations of the BTX&E compounds abode 0.3 mg/Kg. This concentration (0.3 mg/Kg) is the initial trigger cleanup level cited by the State of California Leaking Underground Fuel Wank (L.U.F.T.) Task Force, L.U.F.T. Field Manual (Draft July 1987) . Within each of these boreholes, the compounds exhibited increasing concentrations with depth. The soil samples collecteO directly above the saturated zone exhibit- ed the highest BTX&E and TPH concentrations. 5 s