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i <br /> Report—Vapor Extraction/Air Sparge Remedial System Page 2 <br /> Former Bank of Stockton/Western Lift Site <br /> 1 Project No. 102.3 <br /> • March 25, 2005 <br /> 1.1 Site History <br /> The subject Property has been the subject of remedial investigations from two separate <br /> release sites. The site of the subject gasoline release was discovered near monitoring well <br /> ' MW-1 as a result of a groundwater monitoring event in 1996 at the Western Lift Site in <br /> the southerly part of the subject Property (as shown in Figure 2). Review of historic <br /> records revealed a former 1,000 gallon underground gasoline tank and an above ground <br /> diesel tank were situated along the western Property margin in the north central portion of <br /> the site. In March of 1998, seven groundwater monitoring wells were installed to monitor <br /> the groundwater plume. Two wells, MW-1 and MW-4 still remain from the initial <br /> Western Lift investigation near the south end of the Property. Field work and <br /> groundwater monitoring completed at the site since 1997 show that a former leaking <br /> ' underground gasoline storage tank impacted the soil and groundwater with gasoline range <br /> petroleum hydrocarbons. <br /> ' On August 1, 2003, a document entitled Report, Remedial Action Pilot Test And <br /> Feasibility Study. Cutter Lumber / Western Li t Site, was submitted that describes the <br /> pilot testing work mentioned above. As a part of that work, a vapor extraction well <br /> ' (VES-1) and an air sparge well (ASW-1) were drilled and constructed. These two well <br /> have been retained and included in the final remedial system. <br /> lie 1.2 Scope of Work <br /> The work documented in this report encompasses the following principal elements. <br /> • Drilled and constructed 3 new sparge wells and 5 new vapor extraction wells <br /> • Installed the surface equipment needed to operate the new sparge and vapor extraction <br /> ' wells and one previously constructed vapor extractor. This included the installation of <br /> necessary conveyance piping and manifold system centrally located to assure adequate <br /> control of the remedial system. <br /> 2937 Veneman Ave.,#13240 Geo-Phase EnAronmental Inc. Phone(209) 569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />