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e 404 WEST FREMONT STREET WKA No. 1628. 09 71 I August 31 , 2001 Page 8 (TEFL), positive displacement air sparging blower used to inject pressurized atmospheric air in the groundwater. The air sparging system will be complete with instrumentation for measuring the following: I • air flow rate • air pressure • temperature • dissolved oxygen in groundwater • pressure differential The air sparging system will be equipped with PVC piping, fittings, dilution valves, an in-line 1 micron filter, a coalescing oil filter, pressure relief valve and wellhead connections. The sparging unit is also equipped with a chamber/absorption carbon steel discharge silencer, adjustable motor slide base, auto fault detection, auto power loss restart and automatic high _J temperature and pressure shutdown. z_, Air Sparging Points Existing air sparging points AS 1 through AS3 will be used to deliver pressurized ambient J atmospheric air into the groundwater. Thirteen additional air sparging points will be installed within the petroleum hydrocarbon plume as part of the remediation process. Thirteen soil borings will be drilled to depths of 30 feet below surface grade using a truck-mounted drill rig equipped with hollow-stem augers. The borings will be converted into air sparging points at the locations shown on Plate 3 . Approximately 260 lineal feet of Schedule 40 Polyvinyl f I Chloride (PVC) piping will be installed underground then connected to the air sparging unit via trenches. The air sparging points will be constructed using one-inch diameter, flush jointed, Schedule 40 F PVC casing; 0.014nch slotted casing will be used for the screened 'interval (Plate 4). The screened interval will extend from approximately 25 feet bsg to 30 feet bsg. Number 2/12 sand will be i` placed as a filter pack in the well annulus. The filter pack will extend from the bottom of the t wnu—n�_e • i<uo co- L �I..II `v 1ASSOCIAI ES IM(w,