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' Work Plan-Pilot Testing Page 7 <br /> Cutter Lumber Site <br /> '. Project No. 102.3 <br /> October 30,2001 <br /> 4.0 PILOT SYSTEM WELL INSTALLATION <br /> Two new wells will be constructed through the contaminant plume to test the efficacy of <br /> ' various remedial methodologies that could be employed at this site. The following <br /> section describes the installation of one vapor extraction well and one sparge well. <br /> ' Existing groundwater monitoring wells will be used as a part of the pilot test. It is <br /> anticipated that the wells will be installed approximately I week before the <br /> commencement of the air sparge and vapor extraction pilot test. See the attached site <br /> ' map for well locations. <br /> 4.1 Soil Boring Installation <br /> A total of two soil borings will be installed in the area of the release. These will be <br /> drilled with 10 or 15-inch o.d. hollow stemmed auger tools operated by a C-57 licensed <br /> ' drilling contractor. During drilling, the boring will be logged and sampled by a <br /> professional geologist supervised by a registered geologist. The approximate <br /> characteristics of the borings will be as follows: <br /> Well Boring Diameter Boring Depth <br /> 1 Vapor Extraction Well 15 inch 40 feet <br /> ' 1 Air Sparge Well 10 inch 50 feet <br /> ' 4.2 Pilot Remedial Well Construction <br /> The following section describes the construction of each remedial well. Locking water <br /> tight well caps will be installed on top of each well as well as traffic rated well boxes. <br /> 4.2.1 Vapor Extraction Well Construction <br /> This well, designated VEW-1, will be located near the center of the point of release. The <br /> following table describes the construction of the vapor extraction well: <br /> Casing 4 inch Schedule 40 FVC <br /> Screen 0.040 inch slotted 4 inch Schedule 40 PVC <br /> ' Screened Interval 15-40 feet below ground surface (bgs) <br /> Filter Pack 13-40 feet bgs <br /> Filter Pack Material Pea gravel <br /> ' Bentonite Transition Seal 10-13 feet bgs <br /> Annular Seal 0-10 feet bgs. <br /> 2937 Veneman Ave„#B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br /> 1 <br />