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: - g r«M Three samples from the site contained low levels of toluene. Sample S-8, from the Pit A stockpile, contained .005 mg/Kg of toluene. The soil in this stockpile was derived from throughout the 22 foot deep Pit A excavation. Sample S-1, from the most recent Pit B re-excavation stockpile, contained .002 mg/Kg .of toluene, This soil was derived primarily from the northern end of the pit, down to a maximum depth of five feet BGS. Sample S-3, from the western side of Pit B at a depth of 2.5 feet BGS, contained .003 my/Kg of toluene. All of the soil samples were analyzed for the presence of total lead. The average total lead concentration from the eight samples was 10.8 mg,/Kg with a high of 18.3 from S-2, and a low of 7.1 mg/Kg from S-7. Upon the request of the San Joaquin County EHD, samples S-2 and S-6 were analyzed for soluble lead by the California Assessment Manual Waste Extraction Test (CAM WET) . S-2 contained 0.12 mg/L soluble lead while S-6 contained no detectable soluble lead. in accord with specific discussion by WESTON with the EHD, soil samples from this re-sampling effort were not analyzed for ethylene dibromide (EDB) . 5.2 Water Sampling Results " A water sample, designated S-9, was collected from an irrigation } supply well adjacent to the subject site and analyzed for BTEX, -3 TPH-G, EDB and Total Lead. Analytical results indicate no detectable levels of any of these compounds in the water. 6.0 Analysis of Site conditions The State of California Leaking Underground Fuel Tank Manual (LUFT ~ Manual) contains a method for determining the potential impact of F. gasoline leaks on the envirarment. The Leaching Potential Analysis Chart from the LUFT Manual is presented as Figure 3. The following discussion addresses each of the site feature categories used in this figure with respect to the subject site. 1) Minimum Depth to Groundwater: Based on data Brom the San Joaquin County Flood Control and Water Conservation District (1988 May) , the depth to groundwater in Linden is approximate- ly 125 feet. 2) Fractures in Subsurface: This applies only to foothill or mountain areas, as stated on the form. : 3) Average . Annual Precipitation (inches) : approximately 14 inches per year. UbU Z .1 330 -, 0h 13