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Work Plan-Pilot Testing Page 8 <br /> Cutter Lumber Site <br /> Project No. 102.3 <br /> October 30,2001 <br /> 4.2.2 Air Sparge Well Construction <br /> ' This well, designated SPW-1, will be located approximately 15 feet up-gradient from the <br /> vapor extraction well VEW-l. The following table describes the construction of the air <br /> ' sparge well: <br /> Casing 2" Schedule 40 PVC <br /> ' Screen 0.010 Slotted Schedule 40 PVC <br /> Screened Interval 45-50 feet below ground surface (bgs) <br /> Filter Pack 43-50 feet bgs <br /> ' Filter Pack Material #3 Monterey sand <br /> Bentonite Transition Seal 40-43 feet bgs <br /> Annular Seal 0-40 feet bgs <br /> The sparge well will be screened to expel air near the bottom or slightly below the main <br /> mass of the contaminant. This placement will allow several feet of vertical space in <br /> ' which the air may penetrate deeper into the native formation before beginning to rise and <br /> spread through the main contaminant mass. <br /> 4.2.3 Air Monitoring Well Construction <br /> During the period of the pilot test, several existing groundwater monitoring well (MW-6, <br /> ' MW-7, MW-813 and MW-9) will be used to monitor the effects of the test. These wells <br /> will be temporarily equipped with fittings to accept a magnahelic gauge so that vacuum <br /> ' pressure can be monitored. <br /> 4.3 Well Development <br /> ' The two new service well will not be used for routine groundwater sampling. <br /> Nevertheless, the Vapor Extraction Well and Air Sparge Well will be developed after the <br /> ' well sealing materials have set for at least 48 hours will be developed using mechanical <br /> surging and pumping, or bailing methods until a clear stream of water is generated. This <br /> will be done to facilitate better air flow through the well filter pack material. All <br /> ' development water will be containerized in 55 gallon DOT approved containers and <br /> stored on site until its disposal can be arranged. <br /> ' 4.4 Waste Disposal <br /> All waste generated during the well installation will be containerized in DOT approved <br /> ' containers to await proper disposal. <br /> ' 2937 Veneman Ave.,#8240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />