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APPENDIX A VAPOR TEST PROTOCOL, DATA ACQUISITION METHODS, AND TEST EQUIPMENT Vacuum Test Protocol One extraction/injection (source)well is connected to a Rotron DR404 regenerative blower at least two other vapor extraction/injection wells, which are used as pressure drawdown observation points. During a series of tests a particular well will typically function as both an extraction and an observation well. While air is extracted, the pressure level in the observation well is monitored and recorded Data are recorded as pressure changes from the initial soil air(atmospheric)pressure within the sealed well casing Pressure change data are then used in a modeling analysis to estimate soil air transmissivity in soil These parameters are necessary to determine the effective area of influence. Pressure Monitoring Pressure monitoring was recorded with a Magnehehc' gauge fitted at the influent end of the blower to determine air flow rate; well caps fitted with Magnehehc' pressure gauges with sensitivity levels as low as 0 012-inch water were used to record the pressure change . data from the observations wells. Air Flow Rate The air flow rate is obtained by recording the pressure on a Magneheh6l gauge fitted on a pitot tube at the influent end of the vapor conduit hose Pressure readings are converted to flow rate by referring to the appropriate pitot tube size conversion chart. Influent Hydrocarbon Valor Concentration Influent hydrocarbon vapor concentrations are reported as equivalent parts per million on a combustible gas indicator fitted to the well effluent hose A vapor sample was also collected in a Summa canister for laboratory analysis of total petroleum hydrocarbon(TPH), benzene, toluene, ethylbenzene, and total xylenes (BTEX), analyte distinction and carbon distribution. Vapor Extraction Test Apparatus The vapor extraction test equipment used is a Rotron DR404 regenerative blower The system extracts or injects vapor or air, using the vacuum or pressure created by the blower Pressure responses are monitored with Magneheh6l pressure gauges and then recorded for . data analysis.