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Febi uary 14 1997 ' <br /> Page 15 <br /> from 78 to 88 percent was achieved during the time period between <br /> SVE system activation and the present Since SVE system operational <br /> data indicate that approximately 12,000 pounds of petroleum hydro- <br /> cai bons were removed by the SVE system, the remaining 6,000 to <br /> 21,000 pounds were removed as a result of natural attenuation pros- 1 <br /> esses The migration potential has thea efore been i educed by the <br /> reduction of total mass beneath the site <br /> 3 Impact of petroleum hydrocarbons on groundwater has been effec- <br /> tively remediated 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 /> The case closure checklist, which summarizes site conditions is presented as Attach- <br /> ment E 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 /> Sincerely, <br /> Pacific E vironmental Group, Inc �`` ROSS `,d N. <br /> TlNL NC <br /> No. 5860 <br /> EXP. <br /> Ross Tinline oe7 <br /> Project Geologist �T f�F C, <br /> RG 5860 <br /> Attachments Table 1 - Off-Site Private and Municipal Well Data <br /> Table 2 - Soil Analytical Data - Total Petroleum Hydrocarbons <br /> (TPPH as Gasoline, BTEX Compounds, Organic Lead, <br /> Total Lead, PCBs, and Ethylene Dibronude) <br /> Table 3 - TCLP BTEX Compounds, Total Organic Carbon, and Dry <br /> Bulls Density Analysis <br /> Figure I -' Site Location Map <br /> Figure 2 - Site Map <br /> Figure 3 - Site Map Before SVE System Operation (November 1990 - <br /> November 1992) <br /> Figure 4 - Geologic Cross-Section A-A'- Before SVE System <br /> Operation (November 1990 - November 1'992) <br /> Figure 5 - Geologic Cross-Section B-B'- Before SVE System <br /> Operation (November 1990 - November 1992) <br /> 3201337MCLOSURF3 <br /> 5 <br />