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t <br /> V <br /> r <br /> pecificatiQn_�2g1025-01 <br /> conductivity"in an approach directly analogous to groundwater pumping tests(i.e. <br /> a Theis approach using transicnt drawdowns and/or a Jacobs approach using <br /> steady-state drawdowns). The storage coefficient will also be estimated from the <br /> transient pressure drawdown data. <br /> 4.9 The estimate of gas conductivity and storage coefficient will allow evaluation of <br /> a zone of influence for the extraction well. This value would allow design of a <br /> system that would capture the VOC vapor originating from the site. The final <br /> extraction-well design will be evaluated using analytical and/or numerical models <br /> to predict the overall effectiveness of the remediation strategy. <br /> i . <br /> 4,10 Vapor analysis during pilot testing would be achieved by collection of samples <br /> from the sample ports described above using calibrated air sample pumps, A <br /> measured sample volume would be collected on a carbon trap, in a tedlar bag, <br /> or in a vacuum canister using NIOSH guidelines. The carbon trap would be <br /> analyzed for TPH,and BTXE by EPA Methods 8015M and 8020M. The samples <br /> may be supplemented with Draeger, or equivalent, gas detector tubes for <br /> f ' Benzene. The sampling plan would be as follows: <br /> r., Inlet Bed #1 Outlet Bed #1 Outlet Bed #2 <br /> is <br /> Startup (3) initially, and at 2hr 2/day (1) 2 da 2 <br /> (Day 1) intervals for 4hr(1) <br /> 2/ <br /> y( ) <br /> Week 1 1/day (i) 1/day (1) 1/day (2) <br /> Weeks 2, 3 1/week 1/week 1/week <br /> (if necessary) <br /> Notes: (1). Additional samples may be collected and analyzed during the first three <br /> {}{ ` days of operation. <br /> ks� <br /> (2) Samples would not be analyzed unless the first bed outlet samples or the <br /> online OVM readings indicate Stage 1 breakthrough has occurred. <br /> (3) Surge tests would be conducted as Startup tests. <br /> 4.11 Efficiency and adequacy of vapor extraction as a remedial alternative would be <br /> evaluated after the pilot test from two perspectives: 1) whether the zone of <br /> influence is adequate to place wells and extract vapors from beneath the area, <br /> and 2) whether the amount of discharged VOC vzpor and its adsorption are <br /> adequate. If either perspective is not adequate, then the remedial activities will <br /> be arnended and retested, if necessary. <br /> B-4 AEMEb1ATION <br /> SEAYICES, INC. <br />