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12 <br />' 4.4 Vapor Sampling and Analysis <br />iVapor samples will be collected periodically during the pilot <br />testing as indicated in Table 1. Vapor samples will be collected <br />by connecting a Tedlar bag to the sample port and filling the bag. <br />If the unit is operated with the dilution valve open, a vacuum pump <br />' will be used to collect the sample from the sample port located <br />before the dilution valve. <br />The samples will be analyzed for BTEX using USEPA Method 8020 <br />1 and TVH -G using USEPA Modified Method 8015. Vapor samples <br />collected at the beginning and end of the vent test and at the end <br />tof the vent/sparge test will be analyzed for 02 and CO2using a Field <br />combustible gas indicator (GCI). Relative humidity and temperature <br />of the recovered soil vapor will be monitored periodically with a <br />field meter. The samples collected for analyses will be shipped to <br />the laboratory at the end of each day. <br />1 <br />07/94/1213821125997/REM REP/1 <br />July 1, 1994 9 25am <br />