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Report—Vapor Extraction/Air Sparge Remedial System Page 3 <br /> Former Bank of Stockton 1 Western Lift Site <br /> 1 Project No. 102.3 <br /> March 25, 2005 <br /> 2.0 PILOT TEST SYSTEM INSTALLATION <br /> 2.1 Permitting <br /> Permitting for the on-site work included a drilling permit from the San Joaquin County <br /> Public Environmental Health Department (SJC-EHD). The San Joaquin Valley Unified <br /> ' Air Pollution Control District (SJVUAPCD) previously issued a Permit to Construct <br /> covering the vapor extraction system. <br /> 1 2.2 Soil Boring Installation <br /> In order to complete the system, a total of eight new soil borings were installed in the area <br /> of the release. From April 26 through April 29, 2004 a BK-81 hollow stem auger drilling <br /> rig, owned and operated by V&W Drilling Co. (a C-57 licensed contractor), was used to <br /> drill the borings. <br /> ' Each soil borings was drilled and sampled with 8-inch o.d. hollow stemmed auger tools. <br /> The borings were then over-drilled using 12-inch diameter augers. During drilling, the <br /> borings were logged and sampled by a professional geologist supervised by a registered <br /> ' geologist. <br /> The borings that were to be completed as vapor extraction wells were drilled to a total <br /> Ile depth of 45 feet and the air sparge borings were drilled to a total depth of 50 feet. Five <br /> borings were designated as Vapor Extraction Wells (VIEW 2 through 6) and 3 borings <br /> ' were designated as Air Sparge Wells (ASW 2 through 4). While drilling, all soil cuttings <br /> were stockpiled pending profiling and proper disposal. <br /> 2.3 Well Construction <br /> The following sub-sections describe the physical characteristics of each well constructed. <br /> Upon completion, traffic rated well boxes were installed over each well and the well heads <br /> were equipped with lockable water tight well caps. <br /> 2.3.1 Vapor Extraction Well Construction <br /> The following table describes the construction of the vapor extraction wells: <br /> Casing 4 inch Schedule 40 PVC <br /> ' Screen 0.010 inch slotted 4 inch Schedule 40 PVC <br /> Screened interval 20-45 feet below ground surface(bgs) <br /> Filter Pack 45-15 feet bgs <br /> ' Filter Pack Material 43 Sand <br /> Bentonite Transition Seal 15-13 feet bgs <br /> Annular Seal 13-0 feet bgs <br /> 2937 Veneman Ave., 4B240 Geo-Phase Environmental Inc. Phone(209) 569-0293 � <br /> Modesto, CA 95356 Fax(209) 569-0295 <br /> i <br />