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below the allowable limit or non-detect These three samples were run for STCL lead and reported as non-detect. Refemng to the Spring of 1993 water table map issued by the San Joaquin Flood Control District, PLATE IVA, groundwater is recorded at approximately 63' below ground level at this location However, the highest water levels measured in the last 11 years at this site were approximately 35 bgl in both the spring and fall of 1983. Using this depth to groundwater, n g SB 1 SB 1arled a environmental fate worksheet for Benzene and soil Znng B2 also faile the works eet for Benzene, as well as Xylene (TABLE 2-4) It should �be point out at ere was no soil contamination of any land found below the depth of twenty-six (26) feet, which is approximately ten (10) feet above the highest reported groundwater There is no indication that the groundwater has been affected by the overlying soil contamination If the groundwater was contaminated, some contamination should have been detected at deeper depths in the borings that were bored to 401h-41 feet bg1 While the vertical extent of soil contamination has been determined, the lateral extent remains to be defined RECOMMENDATIONS AIthough the results of the soil bonngs indicate that further investigation may be necessary, • we are not prepared at this time to submit proposals to conduct such work There are several options which must be examined pnor to determining the proper and most cost effective approach These include additional soil borings, hydropunch and/or cone penetrometer sampling, soil vapor surveys, and site excavation Until the County EHD and our clients have had sufficient time to review this report, we feel it would be inappropriate to proceed further We will, of course, proceed in a timely manner once agreement has been reached on a plan of action Hunter & Associates .I 7, 1994 t�' -yD GEpe p c!r cc Valley Motors �� RUIL M14�lA�EB NO 860 OF C •� 6