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' Report-Pilot Remedial System Test Page 9 <br /> Former Manna Pro Site <br /> Project No 207 3 <br /> July 31, 2000 <br />' 3.3 Pilot Remedial Well Construction <br />' The following sub-sections describe the physical characteristics of each well constructed <br /> for the pilot test Upon completion, traffic rated well boxes were installed over each well <br /> and the well heads were equipped with locking water tight well caps <br />' 3.3.1 Vapor Extraction Well Construction <br /> L This well, designated VEW-1, is located near the center of the apparent point of release <br /> The boring was drilled with 8 inch augers and then over drilled with 15 diameter augers <br /> The following table describes the construction of the vapor extraction well <br /> rCasing 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 a vapor extraction well <br /> The reason for this is to bridge the clay layer which 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 /> 3.3.2 Air Sparge Well Construction <br /> This well, designated ASW-1, is located approximately 15 feet up-gradient from the <br /> vapor extraction well VEW-1 It was drilled using 10 inch diameter augers The <br /> following table describes the construction of the air sparge well <br /> tCasing 2" Schedule 40 PVC <br /> Screen 0 010 Slotted Schedule 40 PVC <br /> Screened Interval 50-55 feet below ground surface(bgs) <br /> L Filter Pack 48-55 feet bgs <br /> Filter Pack Material #3 Monterey sand <br /> Bentonite Transition Seal 4548 feet bgs <br />' Annular Seal 045 feet bgs <br /> The sparge well is screened to expel air near the bottom or slightly below the main mass <br />' of the contaminant near the top of an impermeable clay located at 50-52 feet below grade <br /> 2937 Veneman Ave , #13240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0295 <br />