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URS • September 19, 2003 Page 5 VW-313 currently has the highest TPHg concentrations with 2,600 µg/L detected during the June 2003 sampling event 3.0 SUMMARY OF SITE REMEDIATION A list of remedial actions taken at the site is as follows Ia Replacement of three gasoline USTs, associated dispensers, and piping in June —July 1999 (Pinnacle, 1999) I0 Soil vapor extraction (SVE) test with thermal oxidizer treatment was performed using wells VW-1, VW-2, and VW-3 in September 2000(Delta, 2000) Groundwater monitoring is continuing on a quarterly basis I 40 EVALUATION OF REMEDIAL ALTERNATIVES The primary goals of this remediation effort are to reduce the mass of benzene, MtBE, and total petroleum hydrocarbon compounds in soil and groundwater and to prevent further off-site migration of I . dissolved compounds in the groundwater This section identifies potential remedial alternatives that could be used to accomplish these goals, and evaluates their appropriateness to the Site The recommended remedial action is described in Section 5 0 4.1 Soil Remediation Technologies Soil vapor extraction, dual-phase extraction, and soil excavation remediation technologies are presented I below 4.1 1 Soil Vapor Extraction ISoil vapor extraction (SVE) extracts soil vapors using vacuum extraction Three 4-hour SVE tests over a two-day period were performed at this site in September 2000 by Delta The tests were successful at removing contamination from the soil and showed a radius of influence of 34 to 45 feet 4 1.2 Dual-Phase Extraction ' Dual-phase extraction (DPE) extracts both soil vapors and groundwater using high vacuum extraction The lowered groundwater table exposes contanimated soil that is then exposed to the vacuum, enhancing contaminant removal I • K 1WprocessU5 BP AKC0\021861CAP Aug03\02196 CAP03 doc I