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S E C 0 R <br /> Conceptual Site Model <br /> . Chevron Service Station#9-6171 <br /> March 25, 2005 <br /> Page 14 <br /> system is also designed to address soil vapor beneath buildings where air sampling results <br /> indicate the potential for human exposures within the building spaces and in areas where <br /> the three dry-cleaning facilities operated The SVETS consists of a network of 35 SVE <br /> wells located In the source area The spacing and location of the SVE wells were designed <br /> using data from the Phase II IRA SVE pilot test There are no SVE wells located on the <br /> Chevron property A blower was connected within the TSC to provide the vacuum to draw <br /> air through the 35 wells Extracted vapors are treated using the existing vapor phase <br /> granular activated carbon (GAC) canisters Treated air is then discharged to the <br /> atmosphere The details of the construction activities can be found in the Phase II IRA <br /> Detailed Plan (LFR 1999) <br /> 52.3 Phase III— Groundwater Extraction System Expansion, 2002 to Present <br /> The objective of the Phase III Groundwater Extraction System (GWETS) expansion as <br /> described by LFR (LFR, 2003) was <br /> I • To reduce concentrations of PCE in the B-Zone groundwater beneath Lincoln <br /> Center and immediately downgradient from Lincoln Center, consistent with the goals <br /> established in the Phase III IRA Detailed Plan <br /> • To reduce concentrations of PCE in A- and B-Zone groundwater containing residual <br /> levels of PCE downgradient from Lincoln Center, consistent with the goals <br /> established in the Phase III IRA Detailed Plan <br /> Six additional B-Zone Aquifer extraction wells were installed along the eastern boundary of <br /> LVSC, adjacent to Pacific Avenue One of these groundwater extraction wells, GEW-0228, <br /> is located on the Chevron property Four additional B-Zane Aquifer extraction wells were <br /> installed downgradient from LVSC, along Inglewood Avenue The wells are spaced at <br /> approximately 150 to 200 feet intervals Groundwater extracted from these wells is pumped <br /> to the existing TSC At this time, the existing TSC was shut down and expanded to handle <br /> a larger flow rate The details of the construction activities can be found in the Phase III <br /> IRA Detailed Plan (LFR 2001) <br /> I <br /> I <br /> • <br /> N IFiles%Projects\Chevron\RetaiR#9-61711Site conceptual Model\FINAL_CSM doc <br />