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FROM 1997.UN14 17:49 #888 P.16/24 <br /> Februa,•y 14. 1907 <br /> i <br /> i <br /> r <br /> from 78 to SS percent was achieved during the time period between <br /> SVE system activation and the present. Since SVE system operational I <br /> data indicate that approximately 13,000 pounds of petroleum hydro- <br /> carbons were removed by the SVE system, the remaining 6,000 to <br /> 21,000 pounds were removed as a result of natural attenuation proc- <br /> esses. The migration potential has therefore been reduced 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 /> E <br /> 4- The closest domestic well is 1,700 feet upgradient from the site. <br /> r <br /> The case closure checklist, which-summarizes site conditions is presented as.Attach- <br /> ment E. The site poses no sigr4cant 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 vironmentaI Group, Inc. / X1IS '::1.111. <br /> 5ZE0 <br /> "P.1 <br /> Ross Tinline �J:E <br /> A <br /> oQ ,;- <br /> •=T�. <br /> Project Geologist Cr c <br /> RG 5860 - <br /> I <br /> Attachments: Table l - 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 Dibromide) - <br /> Table 3 - TCLP BTEX Compounds, Total Organic Carbon, and Dry <br /> Bulk 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 I992) <br /> Figure 5 - Geologic Cross-Section B-B'-Before SVE System <br /> Operation(November 1990.-November 1992) <br /> I320133701CLOSIMM <br />