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Revised <br /> LFR Levine Fricke <br /> • Collect air flow, re volume flushing.ushing, and pressure data adequate to identify <br /> extraction well spacing requirements for the design of the full-scale SVETS to <br /> address elevated VOC conceuitratioits in unsaturated Zone soil at the Site The <br /> primary factors for well spacing design include <br /> • extraction flow rates <br /> pressure distnbution around wells at different extraction flow rates <br /> (generally referred to as "radius of influence" or "area of influence:") <br /> • average air permeability of sods <br /> • average soil porosity <br /> air velocities and pore gas velocities to estimate pore volume flushing <br /> Collect concentration data in extracted soil vapor to estimate the VOC mass <br /> removal rates that will dictate VOC rnass loading rates for sizing of the emission <br /> control systems and estimating total system operation tune frames The prunary <br /> factors for estima=g VOC mass removal rates include <br /> + distribution of VOCs in soil vapor <br /> • extent of area to be influenced <br /> • vapor flow rates <br /> • VOC concentrations in extracted vapor <br /> 5.1 Well Installation <br /> To achieve the goals stated above, LFR proposes to install nine pilot test wells, as <br /> follows- <br /> Three Uly screened (from approxImately 10 to 35 ft bgs and from 50 to 75 tt bgs) <br /> dual purpose vapor extraction and groundwater sparguig/monitonng wells will he <br /> installed as follows. <br /> In the fey near existing groundwater monitoring well MW-09 Fully Screened <br /> ExUaction Well 1 (FSEW-1) will be installed approximately 20 ft across the <br /> alley from MW-09 and 100 ft from the northwestern cnmer of the Guild <br /> Cleaners 31 S. Church Street parking lot <br /> • In the Guild parking lot, 75 ft south of the western corner of Guild Cleaners, <br /> 31 S. Church Street (FSEW-2) <br /> • In the northeastern corner of the Guild Cleaners 31 S_ Church Street parking lot <br /> (FSEW-3) <br /> Two well clusters (consisting of Partially Screened Extraction Wells/Groundwater <br /> Spargtng wells/Groundwater Monitoring wells PSEW-4, 5, and 6, and PSEW-7, 8, <br /> and 9). The construction specifications for the wells will be as follows <br /> wP-svirrsi ad1-rcy-asiz3 da ire <br /> Page I1 <br /> 00,-TT d 8£T0t'9b60FT 01 9060 2S9 0TS 3A31N3 3NIA31 ad-1 dd L£ 9T Z0, 60 7nf <br />