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404 WEST FREMONT STREET <br /> f WKA No. 1628.09 <br /> ! 7 August 31, 2001 <br /> d Page 8 <br /> j` (TEFC),positive displacement air sparging blower used to inject pressurized atmospheric air in the <br /> groundwater. The air sparging system will be complete with instrumentation for measuring the <br /> following: <br /> • air flow rate <br /> • air pressure <br /> • temperature <br /> a dissolved oxygen in groundwater <br /> • pressure differential <br /> c- The airsparging system will beequipped with PVC piping, fittings, dilution valves an in-line 1 <br /> micron filter, a coalescing oil filter,pressure relief valve and wellhead connections. The <br /> sparging unit is also equipped with a chamber/absorption carbon steel discharge silencer, <br /> adjustable motor slide base, auto fault detection, auto power Ioss restart and automatic high <br /> s' temperature and pressure shutdown. <br /> Air Sparging SparPoints <br /> Existing air sparging points AS 1 through AS3 will be used to deliver pressurized ambient <br /> atmospheric air into the groundwater. Thirteen additional air sparging points will be installed <br /> within the petroleum hydrocarbon plume as part of the remediation process. <br /> Thirteen <br /> soil borings will be drilled to depths of 30 feet below surfaceade usin atruck-mounted <br /> � g <br /> => drill rig equipped with hollow-stem augers. The borings will be converted into air sparging points <br /> at the locations shown on Plate 3. Approximately 260 lineal feet of Schedule 40 Polyvinyl <br /> Chloride(PVC)piping will be installed underground then connected to the air sparging unit via <br /> trenches. <br /> The air sparging points will be constructed using one-inch diameter, flush jointed, Schedule 40 <br /> PVC casing; 0.01-inch slotted casing will be used for the screened interval(Plate 4). The screened <br /> =_ interval will extend from approximately 25 feet bsg to 30 feet bsg. Number 2112 sand will be <br /> placed as a filter pack in the well annulus. The filter pack will extend from the bottom of the <br /> <j <br />