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l City of Stockton, Fire Station No. 12 A68105.01 August 7, 1995 Page 11 f and 0.6 gallons of diesel. These estimates are conservative based upon the previously discussed assumptions required to make the above calculations; • Based on a LUFT Leaching Potential Analysis, the soil containing PPCs do not appear to pose a threat to groundwater beneath the site; and • Drill cuttings and decontamination rinsate do not appear to contain hazardous concentrations of PPCs. 8.0 RECOMMENDATIONS r i • Copies of this report should be forwarded to SJCPHS for review and comment; and • The drill cuttings and decontamination rinsate should be disposed of in a manner Li consistent with state and federal regulations. 9.0 LIMITATIONS Conclusions and recommendations presented in this report are based on the assumption that subsurface conditions and chemical concentrations do not deviate from those disclosed in the field and laboratory testing. If variations from these findings are found, Twining should be notified so that supplemental conclusions and recommendations may be provided. The purpose of a geologic/hydrogeologic study is to reasonably characterize existing site j { conditions based on the geology/hydrogeology of the area. In performing such a study, it L•� 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. t Environmental conditions may exist at the site that cannot be identified by visual observation. Where subsurface work is performed, our professional opinions are based in part on interpretation of data from discrete sampling locations that may not represent actual conditions at unsampled locations. 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 i site, but rather as the result of the services performed within the scope, limitations, and cost of the work performed. 1 I