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performed between October 1988 and June 1994 <br /> hydrocarbons were detected in water samples No petroleum hydros les from MW-8 or EW-1 during p <br /> either the June 1994 or September 1994 samplings. This indicates a dramatic decrease in <br /> petroleum hydrocarbons since 1988 The process of vapor extraction in the vicinity of these <br /> wells, combined with natural degradation is most likely responsible for the sharp decrease <br /> in petroleum hydrocarbons Extremely low levels of toluene and xylenes were detected in <br /> the sample from MW-9 during the June 1994 sampling. However, hydrocarbons were not <br /> confirmed during the September 1994 sampling. Concentrations of all contaminants detected <br /> during the July 1994 sampling were below the State of California Action Level (AL) and <br /> Maximum Contaminant Levels (MCLS) for drinking water <br /> 5.2 Additional Soil Remediation <br /> In the letter dated October 5, 1994, the PHS/EHD stated that soil "contamination remaining <br /> I is a threat to groundwater and further remediation is required " The PHS/EHD also stated <br /> that "a plan for continued remediation of the site should be included in the quarterly report <br /> that discusses the September 16, 1994 water sample results " <br /> GeoAudit is currently evaluating options for the continued remediation of hydrocarbon <br /> impacted soil at the site However, we believe conventional remediation methods will not <br /> effectively reduce the volume of hydrocarbons remaining in the soil contamination at the <br /> site <br /> GeoAudit recommends that the next quarterly sampling be scheduled for December 1994, <br /> monthly groundwater depth measurements should continue Options for further <br /> remediation at the site will be discussed in the December 1994 Quarterly Report <br /> 6.0 LIMITATIONS <br /> E <br /> Our professional services were performed using that degree of care and skill ordmanly <br /> exercised by environmental consultants practicing in this or similar localities The findings <br /> were based upon analytical results provided by an independent laboratory. Evaluations of <br /> the geologic/hydrogeologic conditions at the site for the purpose of this investigation are <br /> made from a limited number of available data points (i a monitoring wells) and subsurface <br /> conditions may vary away from these data points No other warranty, expressed or implied, <br /> is made as to the professional recommendations contained in this report <br /> f <br /> I <br /> 10 deaon BI�ry QRf9 9Vl 1 <br /> 1 <br />