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18 <br />6 Pilot Study Procedures <br />After the equipment is installed at the facility, baseline <br />water levels, dissolved oxygen (DO), and vacuum measurements will <br />be taken at all of the wells used in the pilot test. All <br />measurements collected during the pilot testing will be recorded in <br />test logs provided in Appendix A. <br />The soil venting test will run for approximately 24 hours <br />prior to start up of the 24 hour air sparging test, followed by a <br />24 hour combination vent/sparge test. <br />6.1 Step Vacuum Test <br />Prior to the start of the vent test, a step vacuum test will <br />be performed. The purpose of this test is to identify the optimum <br />vacuum and flow rate for the vent test. A groundwater level in the <br />vent well will be recorded before proceeding with the step vacuum <br />test. The water level will be used to calculate the amount of well <br />screen open to the vadose zone, and the maximum amount of vacuum to <br />apply to the well during testing. <br />The following procedures will be followed for the step vacuum <br />test. <br />1. Adjust the flow control valve and dilution valve to full open. <br />2. Turn on the power supply to the equipment trailer. <br />3. Start the venting unit at that units control panel. <br />4. Adjust the vacuum on the well to 10 in. H2O by closing the <br />dilution valve and monitoring the vacuum gauge. <br />5. After approximately five minutes record the time, vacuum <br />applied to the well, flow from the venting unit, flow into the <br />dilution valve if applicable, and FID measurement of the <br />recovered vapors from before the dilution valve. A vacuum <br />pump will be used to obtain a vapor sample for the FID <br />readings. <br />07/94/1213821125997/REM REP/1 July 1, 1994 9 26am <br />