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September 18, 1996 <br /> Page 8 <br /> the present' _Since SVE system operational-data indicate that _ <br /> approximately 12,000 pounds of petroleum hydrocarbons were <br /> removed by the SVE system, the remaining 10,000 pounds were <br /> removed as a result of natural attenuation processes The rrvgration <br /> potential has therefore been reduced by the reduction of total mass <br /> beneath the site <br /> 3 impact of petroleum hydrocarbons on groundwater has been,effec- <br /> tively <br /> effec-tively emediated by SVE as evidenced by minor residual concentra- <br /> tions of TPPH-g and benzene in the source area and plume definition <br /> by non-detectable concentrations of petroleum hydrocarbons <br /> 4 The closest domestic well is 1,700 feet upgradient from the site <br /> I <br /> The case closure checklist, which summarizes site conditions is presented as Attach- <br /> ment C The site poses no significant threat to groundwater quality, therefore PACIFIC <br /> recommends case,closure <br /> If you have any questions regarding the content of this letter, please call <br /> I <br /> I <br /> Sincerely, <br /> Pacific Environmental Group, Inc. <br /> 1 <br /> Mark T Kuncir <br /> Staff Geologist ,�j /"" "�•�f�� <br /> �i <br /> r ,P. / 97 <br /> Ross Tinline <br /> Project Geologist ` <br /> RG 5860 <br /> 320133713 CLOSUREI <br />