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0 <br /> • The option that best suits the specifics of the problem and meets the anticipated regulatory needs is to <br /> treat the site by combined simultaneous vapor extraction and groundwater pump and treat Details of <br /> this plan are presented below <br /> Groundwater target cleanup levels have not been set for this site because it is impractical to do so at <br /> this time Actual target levels will be established after one year of system operation, when there is <br /> tangible data on the response of the subsurface system If a target level is required for review of the <br /> CAP at this point m time, then the MCL is selected as the target concentration for aromatic <br /> compounds Please note however, that these levels are frequently impractical or impossible to achieve <br /> Until we have operational data on system effectiveness, it is not possible to state whether or not this <br /> goal is realistic <br /> Vapor Extraction Field Test <br /> To evaluate the feasibility of vapor extraction as a remediation option, a vapor extraction field <br /> test was recently conducted at the site The test was intended to define important subsurface <br /> parameters that could affect the applicability of vapor extraction at this site These parameters <br /> include the sod permeability to air, the radius of vacuum influence, and the hydrocarbon <br /> production rate of the wells <br /> Three vapor extraction wells (TB6, TB9S, and TB9D) were tested by Alton Geoscience on <br /> June 26, 1995 The vapor treatment equipment used for the test was a VR Systems Model <br /> Number V3 unit The system uses a 4-cylinder internal combustion engine to treat the affected <br /> vapors pnor to atmospheric discharge During the test, measurements of applied vacuum, flow <br /> rate and observation well vacuums were made Each test was conducted for about one hour to <br /> ensure steady state flow conditions had been established <br /> Page 7 <br />