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V <br /> Geological Technics lac. Page 7 <br /> B ioventingB iosparging <br /> Pilot Test Work Plan <br /> ' Project No.770.2 <br /> June 9,2006 <br /> injection well pair, IW-1 and IW-101, will be placed in the former UST excavation near <br /> MW-4 that has the highest documented soil contamination (see Figure 10 for proposed well <br /> .. locations). Figure 5 shows the proposed well pair IW-1/101 superimposed on cross section B <br /> — <br /> B'. <br /> Three similarly constructed extraction well sets will be installed at varying distances from the <br /> injection well set to determine the radius of influence and for varying injection/extraction <br /> schemes. These well sets will be designated EW-1/101,EW-2/102 and EW-3/103. <br /> 6.6 <br /> The well construction details are included in the following table: <br /> 0.020" slots Filter Pack Bentonite Cement <br /> Well Diameter Screened Interval 3#sand Annular Grout <br /> (ft) (ft) Seal (ft) (ft) <br /> IW-1 2" 42 -44' 41 -45' 39 -41' 0 - 39' <br /> IW-101 2" 55 - 57' 54 - 58' 52- 54' 0 - 52' <br /> EW-1 2" 42 -44' 41 -45' 39 - 41' 0 - 39' <br /> EW-101 2" 55 - 57' 54 - 58' 52 - 54' 0 - 52' <br /> EW-2 2" 42 -44' 41 -45' 39 -41' 0 - 39' <br /> EW-102 2" 55 - 57' 54- 58' 52 - 54' 0 -52' <br /> EW-3 2" 42 - 44' �54 <br /> 41 -45' 39 - 41' 0 -39' <br /> EW-103 2" 55 - 57' - 58' 52 - 54' 0 - 52' <br /> Placing the wells in this position will provide fresh oxygen through the most heavily <br /> impacted soils at the site. <br /> Well installation a 11 <br /> Prior to commencing work, encroachnfent permits andso'1 boring/monitoring well permits <br /> will be secured and the SJC PHS/EHD will be notified 47hours in advance. The subsurface <br /> will be cleared of underground utilities by notifying Underground Service Alert. <br /> The borings will be drilled using an 8-inch outside diameter continuous flight hollow stem <br /> auger by an appropriately licensed driller. The deeper boreholes will be continuously cored <br /> r <br /> for lithology to terminal depth and the shallow wells will be free drilled to total depth. <br /> Soil cuttings will be containerized in DOT approved 55-gallon steel drums and held on site <br /> pending disposal. <br /> Well construction, <br /> The moniff ing wells will be constructed using 2.0 inch inside diameter PVC casing with <br /> flush threads. A #3 sand filter pack will surround and extend one foot above and one foot <br /> below the 0.020 inch screened interval. A two-foot transition seal will be installed above the <br />