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1 <br /> ' I -flail#700 i0 E3l ir. [m ii auu it tl <br /> I� Rc,rttcd,11 11-r5rhilm IcNl Repots Ftbi n its 2 S '200 <br /> 4.0 REMEDIAL INVESTIGATION-FEASIBILITY TESTING <br /> ' On November 18 through the 21, 2002, Blaes Environmental conducted remedial feasibility testing at the <br /> site Remedial feasibility testing included an AS and VE test, aquifer pump testing, and sample <br /> ' collection for blofeasibility analysis The remedial tests were performed to evaluate the suitability of <br /> various remedial options <br /> ' 4 1 AIR SPARGE TESTING <br /> AS testing was conducted at the site on November 18, 2002 in order to determine the feasibility of AS <br /> ' remediation of petroleum hydrocarbon impacted groundwater beneath the site The AS test equipment <br /> was transported to the site and manifolded to remedial well ASW-1 The AS test equipment was trailer <br /> ' mounted and consisted of a propane-fueled 20-horsepower motor that was connected to a belt driven <br /> positive displacement(PD) AS blower The AS blower was designed to generate a maximum flow of 60 <br /> ' cubic feet per minute (cfxn) at up to 13 pounds per square inch (psi)pressure Sparge air passed through <br /> a particulate filter from the atmosphere, through the PD blower, and was subsequently forced under <br /> ipressure to the saturated zone via remedial well ASW-1 The objective of AS testing was to evaluate the <br /> following parameters <br /> • Determination of the pressure required to overcome hydrostatic head in saturated soils to provide <br /> ' effective sparge flow, <br /> • Determination of the soil vapor pressure achieved in the vadose zone at lateral distances from the <br /> ' remedial AS test well, <br /> • Determination of the change in dissolved oxygen concentrations at lateral distances from the AS test <br /> ' well produced by air sparging, <br /> • Determination of the effect of AS remediation on dissolved-phase petroleum hydrocarbon <br /> concentrations in the groundwater at the site, <br /> ' • Determination of the estimated effective radius of influence (ROI) of AS for future equipment <br /> specifications and possible well spacing intervals <br /> A description of each task associated with the AS test conducted at the site is presented in the following <br /> ' sections <br /> • <br /> 1 7 <br />