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n ' 24 August 2000 AGE-NC Project No 00-0725 ' ' Page 6 of 6 ' • The highest concentrations of petroleum hydrocarbons was detected in the area of the northernmost dispenser island (boring 133) In the soil, the 100 mg/kg TPH-g isocontour is defined by boring B 1 to the south and boring B2 to the east (Figure 3 and Figure 4 - TPH-g Isoconlour in Soil) The TPH-g isocontour is not defined to the north or west The BTEX plume is fairly well defined to the north, south and east of boring B3 • TPH-g and various BTEX compounds were detected in the grab ground water samples ' collected from the site Benzene concentrations exceed the State of California, Department of Health Services action level for drinking water in samples collected from boring B2, B3 and 134 The hydrocarbon plume has not been defined with the sample locations • No MTBE or other fuel oxygenates were detected during this investigation which is consistent with the likely age of the hydrocarbon release (prior to 1970) 6.0. RECOMMENDATIONS Based on the findings and conclusions of this investigation, AGE recommends 10 Preparation of a work plan for site remediation and installation of four ground water wells at the site A quarterly ground water monitoring program should be initiated at the site ' following installation of ground water monitoring wells 70. 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 (soil and ground water samples) 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 I • I