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11 x ,.r '^5 PRELIMINARY HYDROGEOLOGIST ASSESSMENT REPORT -- 148M West Frontage Road Manteca,California Delta Project No. 40-88479 Page 2 > • Select soil samples from each boring according to soil-screening results for submittal to a California-certified laboratory to be analyzed for benzene,toluene,ethylbenzene,xylenes(BTEX), ethylene dibromide(EDB),I,2-dichlorethane(EDC),and total purgeable petroleum hydrocarbons (TPPH) using U.S, Environmental Protection Agency (EPA) Method 8260, Properly develop the monitoring wells and collect water samples from each well for submittal la! to d California-certified laboratory to be analyzed for EDB, EDC, BTEX,and TPPH by EPA Method 8260. • Conduct slug tests to evaluate hydraulic conductivity. Prepare this report of our findings and make recommendations regarding future assessment and/or remedial activities at the site. 1.3 Summall of Previous Work is Earth Treatment Systems Environmental Consultants(ETS)had been retained previously by Jerry Moore, of Moore Petroleum Inc., to conduct a preliminary site assessment. This site assessment consisted of the is drilling of two soil borings and the installation of a monitoring well in each soil boring. Soil and water fra samples were collectr.d from the soil borings and monitoring wells,respectively. The following sections, ( ° 1.3.1 and 1.3.2,are summaries of the ETS report that resulted from this investigation (ETS Environmental Prelbn?nary Site Assessment,Project No.303,dated October 7, 1988). I F 1.3.1 Soil Borings Inc two soil borings (MW-1 and MW-2)were advanced with a hollow-stern auger to a depth of 49 and 45 feet,respectively. Soil samples were taken at 5-foot-depth intervals with a California modified split- spoon sampler. Figure 2 shows tt,,location of the soil borings/monitoring wells. Boring logs for the soil borings are presented in Appendix A. Lm Soil samples collected from the soil borings were analyzed by a California-certified laboratory for BTEX, - and-TPPHby EPA-Method-524:2/8240: Results of the analyses are listedto TabIs L s, Laboratory reports for the soil samples are presented in Appendix B. As shown in Table 1, BTEX constituents are found at low levels in all soil samples with the highest values found in the 20-foot sarliple taken from MW-2 BTEX and TPPH results from this sample were 0.06, 0.37, 0,31, 1.9, and 88 ppm, respectively.