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• method has potential at the Valley Motors site because the contammanted soil is sandy, relatively permeable, and mostly above the groundwater interface 4 3 1 Test Equipment The vapor extraction unit will consist of an internal combustion engine equipped with a 100 cubic feet per minute (cfin) blower to extract the vapors from the extraction test well, but the unit will likely operate at 40-60 CFM The well will be manifolded to the extraction unit with 4-inch PVC The extraction well will be fitted with a Magnehelic gauge and sample port to allow vacuum pressures to be measured and air samples to be collected A water vapor dropout dru-n will be connected between the well and the destruction unit to remove water before it enters the engine Propane will be used as an auxilliary fuel to get the unit running until it can be operated on gasoline vapors Because the static water level is above the screened interval in all of the on-site monitor wells, it will probably not be possible to use these wells to observe the radius of influence of the extraction well It may be possible, however, to determine the radius of influence from VM-5 acid \'M-7, and these wells will be fitted with Magnehehc gauges 4 3 2 Test Parameters The following parameters will be measured to determine the effectiveness of the test Flow rate Vacuum pressure at extraction point Vacuum pressure at monitoring points Inlet total petroleum hydrocarbon concentrations (TPH) as measured hourly by i portable photo-ionization detector(PID) Inlet TPH and volatile aromatic hydrocarbon concentrations (BTEX) of tedlar-)ag vapor samples collected after one hour and at the end of the test Exhaust TPH concentrations as measured hourly by PID 4 3 3 Test Duration and Monitoring The well will be tested for an 8-hour period PID readings of hydrocarbon concentrations will be taken at 30-minute intervals, and Tedlar bag samples will be collected at the beginnin; and end of the test The samples will be analyzed for TPH-gasoline and BTEX 4 3 4'Data Analysis At the conclusion of the test, the data will be analyzed to draw conclusions regarding the viability of vapor extraction for this site The findings will be presented in the Problem Assessment Report, which can then be used to design a full-scale vapor extraction system, if appropriate, and prepare a Corrective Action Plan 4.4 Air Sparging with Soil Vapor Extraction Air sparging has been shown to be an effective technology for remediation of contamin,Lted groundwater This technology stimulates the volatilization of hydrocarbons out of groundwater, i