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30 December 1998 • AGE-NC Project No 95-0173 Page 10 of 12 Vapor samples will be collected on a monthly basis from the influent end of the VES utilizing the vacuum pump on a Mode_ amc vapor meter rThenno Environmental Instruments Inc ) The samples will be collected-in Tedlar 6a3 4nd transported to a DTSC-certified laboratory in a chilled container under ice and transported under chain-of-custody procedure During the"start-up"period for the SVE system,organic vapor and operational parameters(air flow, combustion temperature, volume of processed vapor, oxygen level and the lower explosive limits) will be monitored on a daily basis The anticipated start-up period will be approximately one week ' 43 IN-SITU AIR SPARGIN G SYSTEM DESIGN IIrvtiation of an IAS system is proposed within the"core"petroleum hydrocarbon-impacted area,IAS is proposed in conjunction with SVE concurrently at the site The proposed IAS system would comprise of an electric air compressor to in ect air beneath the water table using air sparging wells The compressor will provide betweer 3 and 10 pounds per squ�inchwasi)of air to each air sparge well The injected air will volatilize dissolved hyarbonter, and force hydrocarbon lievapors into the vadose zone, where they can be withdrawn by the SVE system The proposed TAS system will consist of the two existing IAS wells (AW-1 and AW-2), three existing ground water monitoring wells (MW-1, MW-2 and MW-3) located near the former UST area in addition to five proposed new IAS wells Approximate air sparging well locations are depicted in Figure 4 4 3 1 In-situ Air Sparging Well Installation _f* Sw\_ 0 Installation of five IAS injection wells are proposed utilizing a truck-mounted drill rig equipped with I 8-inch diameter hollow stem augers Hollow stem augers will be cleaned prior to a vancement in each borehole The IAS injection wells will be advanced to depths of approximate) 40 feet b4 The IAS injection wells will be completed with 2-inch diameter, schedule 40 PVC casing emplaced through the hollow stem augers, utilizing five feet of slotted well casing (0 020-inch) from 35 to 40 et b,g A#3 i oiicStai Lapis Luster said will be poured down the annulus between the well casing and the inner wall of the hollow stem auger The filter pack will be placed adjacent to the screen I (0 020 inch screen size) from the bottom of the boring to a point approximately 2 feet above the top of the screen A three foot interval of coded bentonite pellets (Pell plug) will be placed above the filter pack and will serve as an annular seal Portland cement will be utilized to grout from the annular seal to surface grade A proposed IAS injection well diagram is included as Figures 8 Advanced GeoEniironmental,Inc