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r PROBLEM ASSESSMENT REPORT Moore Petroleum, Inc. 5941 F Street, Banta, CA NGA Project No. 10-90-481 Pege 6 slightly above detection limits for the analytical employed. Table 3 presents a summary of soil technique analytical results from all soil samples that have been analyzed at the site. Laboratory reports for the most recent sampling as well as previous soil sampling at the site are presented in Appendix B. TABLE 3 Soil Analytical Resulta Sample Depth Ethyl- -__LD It-t-L_ Benzene Toluene Benzene Xylenes EDC EDB MPH MW-1 5 NF 0.08 NF ,.., NF NF NF 3.0 10 0.3 NF 4.8 8.5 . NF NF 450. 0 G, MW-2 5 NF 0.005 0.002 10 NF 0.015 NF NF <0.2 0.004 NF 0.009 NF NF <0.2 . MW-3 10 NF NF NF NF NF NF <0.2 ?MW-4 20;: 0.002 NF 0.002 NF NF NF NF NF (dup) 10 NF O.OQ2 0.003 NF NF ry 0.001 NF 0.001 0.003 NF 2.4. NF 0. 4 MW-6 10 NF NF NF NF NF NF NF _._. NOTES: all values in parts per million (ppm) NF = Not Found TPH = Total Purgeable Petroleum Hydrocarbons EDC = 1,2-Dichloroethane EDB = Ethylene Dibromide 3.5 Rydr9 9910 Following the recent installation of additional monitoring wells at the site, the top of casing elevations for all monitoring wells have been re-surveyed by a California Registered Surveyor. Casing. elevations as well as recent water level data are presented in Table 4. The most recent water level measurements at the site shows that the elevation of the ground-water surface beneath the site varies from a low of 15.43 feet mean sea level (msl) at MW-3, to a high of 15.83 feet msl at MW-6. A water table contour map, based on the August 27, 1990, water level-monitoring-event-is-shown--- as Figure-6. -The-ground-water-:contour ma indicates that. round T water'flow. is in 4n eastward direction at map'An of about"'.003 i foot/foot. The average hydraulic conductivity of the water-bearing'.