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' Working To Restore Nature subsurface air flow rates are sufficient for remediation. RESNA estimates that a wellhead flow rate of 40 acfm and vacuum of 2 0 inches H2O will result in an effective radius of influence of1,' ' approximately 25 feet in the shallow soil zone (10 to 30 feet) and a wellhead flow rate of 40 acfm and vacuum of 100 inches H2O will result in an effective radius of influence of approximately 25 feet in the deep zone (33 to 40 feet) The results of laboratory analyses of the vapor samples indicated that the influent TPHg concentrations ranged from 6,800 milligrams per cubic meter (mg/m3) from well VW-1 to r17,000 mg/m3 from well VW-5d The I.0 engine influent and effluent vapor samples collected from extraction wells VW-1 and VW-5d indicate an engine destruction efficiency of greater than ' 99 percent for benzene and TPHg. ' Based upon the VET data, RESNA concludes that vapor extraction is a LfeasiTle method of remediating soil at this site. 3.2 Groundwater Pump Test On October 20 and 21, 1992, RESNA conducted a groundwater pumping test at the site ' Testing consisted of three components. First, two short-term constant rate tests using recovery well RW-1 were conducted. These tests provided information regarding well productivity and efficiency and were used to select the rate for the long-term constant rate test which constituted ' the second element of the testing program. The long-duration constant-rate pumping test utilized recovery well RW-1 for production and piezometer PZ-1 and monitoring wells MW-1 and MW- ' 3 as observation points. Data from this test were used to evaluate the aquifer hydraulic parameters, transmissivity and specific yield, and to provide information regarding boundary conditions and anisotropy The third component of the test consisted of a period of static groundwater monitoring These data were used to establish non-pumping conditions and to aid 38009-838009-8 FRP 8