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v 05 October 1999 AGE-NC Project No. 98-0398 Page 4 of 5 detected benzene, toluene, MTBE, ETBE, TAME, DIPE or TBA-impact to ground water. The State of California drinking water standards, adopted by the Safe Drinking Water Act, have established maximum contaminant levels (MCLS) for benzene, toluene, ethylbenzene and xylenes at 1 4g/l, 150 4g/l, 700 ugll and 1,750 ug1l, respectively. Concentrations of dissolved BTEX compounds detected in the grab ground water samples collected from P-1 were all below MCLs. The closest water wells to the site are monitoring wells located approximately 300 feet east of the site(Spot-Free Car Wash-2150 Country Club Boulevard and Boulevard Automotive Service-2151 Country Club Boulevard); based on review of Lines of Equal Elevation of Ground Water - Fall 1997, published by the San Joaquin County Flood Control and Water Conservation District, the monitoring wells are located in a cross-gradient relationship to the subject property. Due to the cross- gradient relationship and because all detected BTEX compounds were below MCLs, it is unlikely that any petroleum hydrocarbon impact from the site would impact any of the above referenced monitoring wells. AGE concludes that petroleum hydrocarbons remaining beneath the site appear to pose minimal risk to human health and beneficial uses of ground water down-gradient from the subject site. Based upon data collected from the site.. AGE recommends that no further subsurface investigation be conducted at this time and that consideration be give to the site for closure as a low risk ground water site. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based upon analytical results provided by an independent laboratory. Evaluation of the hydrogeologic conditions at the site for the purpose of this investigation was made from a limited number of available data points, and subsurface conditions may vary away from these data points. No other warranty, expressed or implied, is made as to the professional recommendations contained in this report. Advanced CeoEnvironmental,Inc.