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' City of Stockton - Van Buskirk Park Golf Course TL 394-0074-01 July 29, 1994 Page 8 i 6.0 EVALUATIONS AD Two soil samples (MW1-15 and MW3-15), collected from beneath the water table contained detectable concentrations of TPH-D. The concentrations were at the method detection limit of 1 mg/kg. Soil samples analyzed from the vadose zone did not contain detectable concentration of PPC's. The groundwater sample collected from MW3 contained detectable concentrations of benzene (1.4 ug/L), and TPH-G (55 ug/L). The detected benzene concentration exceeds the maximum contaminant level (MCL) of 1 ug/L in §644445 of Title 22 of the California Code of Regulations. Groundwater samples collected from MW1 and MW2 did not contain detectable concentrations of PPG's. 7.0 CONCLUSIONS AND RECOMMENDATIONS ' Based on the results of this investigation, Twining has made the following conclusions: o PPC's were not detected in soil samples collected from the vadose zone. o Analysis of the groundwater sample collected from MW3 detected benzene at a concentration greater than the MCLV listed in Title 22 of the California Code of Regulations; o The lateral extent of PPC impacted groundwater has not been fully assessed. Based on the above conclusions, Twining presents the following recommendations: o A copy of this report should be submitted to the SJCEHD for review and comment. 8.0 LIMITATIONS ' This report was prepared with the understanding that it is the responsibility of the client to transmit this report, in its entirety, to the appropriate regulatory agencies. The findings contained in this report are solely professional opinions derived in accordance with current standards of professional practice. The work was performed for the sole use of Twining's client and appropriate regulatory agencies. Any reliance on this report by a third party is at such party's sole risk. ' The purpose of a geologic/hydrogeologic study is to reasonably characterize existing site conditions based on the geology/hydrogeology of the area. In performing such a study, it ' is understood that a balance must be struck between a reasonable inquiry into the site conditions and an exhaustive analysis of each conceivable environmental characteristic. No investigation is thorough enough to describe all geologic/hydrogeologic conditions of interest at a given site. If conditions are not identified during the study, such a finding should not be construed as a guarantee of the absence of such conditions at the SITE, but