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iReport—Vapor Extraction/Air Sparge Remedial System Page 5 <br /> Former Manna Pro Site <br /> Ile Project No 207 3 <br /> September 26,2003 <br /> Casing 4 inch Schedule 40 PVC <br /> Screen 0 040 inch slotted 4 inch Schedule 40 PVC <br />' Screened Interval 20-50 feet below ground surface(bgs) <br /> Filter Pack 18-50 feet bgs <br /> Filter Pack Material Pea gravel <br /> Bentonite Transition Seal 18-15 feet bgs <br /> Annular Seal 0-15 feet bgs <br /> The screened interval of 20 to 50 feet is greater than usual for vapor extraction wells <br /> The reason for this is to bridge the clay layer that is present from 35 to 45 feet below <br /> grade and enable sparge air from the sand beneath the clay layer to migrate to the surface <br /> M2.3.2 Air Sparge Well Construction <br /> This sparge wells were drilled using 12-inch diameter augers and bits The following <br />' table describes the construction of the air sparge wells <br /> Casing 2" Schedule 40 PVC <br />' Screen 0 010 Slotted Schedule 40 PVC <br /> Screened Interval 50-55 feet below ground surface(bgs) <br /> Filter Pack 48-55 feet bgs <br /> Filter Pack Material #3 Monterey sand <br /> 10 Bentonite Transition Seal 45-48 feet bgs <br /> Annular Seal 0-45 feet bgs <br /> The sparge wells are screened to expel air near the bottom or slightly below the main <br /> mass of the contaminant near the top of an impermeable clay generally located at 50-52 <br /> feet below grade <br />' 2.4 Well Development <br /> Since the new wells are not be used for routine groundwater sampling, it was not deemed <br />' necessary to "developed" them, although the wells were surged by the drilling crew <br /> immediately after each well was set A surge block made to gauge was used for this <br />' purpose <br /> 2.5 Waste Disposal <br />' All waste water generated during the installation of the wells was collected for recycling <br /> by American Valley Waste Oil along with monitoring well purge water A copy of the <br /> manifest is attached in Appendix C <br /> Waste soil cuttings were temporarily stored in an on-site stockpile After waste <br /> characterization, Manley & Sons Truck, a licensed hazardous waste hauler transported the <br />' 36 yards of soil in bulk trucks to the Forward Landfill, a class 11 facility located in <br /> Manteca on May 16, 2003 Photocopies of the manifests are attached as Appendix C <br />' 2937 Veneman Ave,#13240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />