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44 Remedial Feasibility Testing <br /> Remedial feasibility testing will include 8 hours of soil vapor extraction (SVE) and 4 hours of air <br /> sparging (AS) <br />' 4 4 1 Soil Vapor Extraction Test <br />' To evaluate the effectiveness of SVE in remediating subsurface soils, a total of eight hours of <br /> SVE testing will be conducted The testing will include two hours of extraction from each of the <br /> SVE wells in the nested SVE well (SVE-1A/B/C), and one hour of soil gas collection from MW-1 <br /> and SVE-213 The SVE test results will be used to evaluate the following design criteria <br /> • Relationship between subsurface airflow and pressure, <br /> • Effective permeability to airflow, <br /> • Radius of influence, <br /> • Existing soil vapor chemistry with respect to petroleum hydrocarbons, <br /> • Evidence of biodegradation, and <br /> • Feasibility of soil vapor extraction/bioventing as remedial technology <br /> The SVE test unit will consist of a SVE blower, capable of producing air-flow at a rate of up to 250 <br /> cubic feet minute (cfm) and a vacuum of up to 15 inches of mercury Soil vapors extracted during <br /> the test will be filtered through two, 200-pound vapor-phase granular activated carbon vessels, <br /> prior to discharge to the atmosphere <br /> Vacuum gauges and air-tight well caps will be placed on the surrounding observation wells (MW- <br /> 1, MW-2, the proposed monitoring well west of the former UST#3, and the remaining SVE wells <br /> not being used for extraction ) During the SVE tests, air-flow rate, lower explosive limit (LEL), <br /> vapor concentration by PID, and vacuum will be measured every 30 minutes from the observation <br /> wells Final measurements will be made approximately 30 minutes after SVE test completion <br />' The influent and effluent air stream from the SVE unit will also be monitored using a PID, every 30 <br /> minutes during the SVE tests To confirm PID measurements, influent sod vapor samples will be <br />' collected during each of the SVE tests and the soil gas collection tests The soil vapor samples <br /> will be collected in Tedlarrm bags, which will be labeled and transported with chain-of-custody <br /> documentation to a state of California-certified hazardous waste testing laboratory The <br /> laboratory will analyze the soil vapor samples for TPH-as-gasoline, BTEX, MTBE, DIPS, ETBE, <br /> TAME, TBA by EPA Method 8020/8015M and/or 8260B <br /> 16 <br />