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_ 4.3 Vapor Extraction Methodology <br /> A regenerative blower was used to produce a vacuum within the wells Vacuums created in the <br /> particular extraction well and adjacent monitoring wells were measured with manometers in <br /> order to evaluate vapor migration within the vadose zone Several liters of air were sampled <br /> from the wells and collected in Tedlar vapor sample bags The bags were transported to Sierra <br /> Laboratories, Inc of Anaheim, California using full chain of custody protocol and analyzed for <br /> ' TPH and BTEX <br /> Vapors generated during the tests were passers through a 200 pound canister of activated carbon <br /> to treat the vapors prior to discharge the atmosphere A Century 128 organic vapor analyzer <br /> (OVA) was utilized to monitor outlet emissions Specific data collected on-site is presented in <br /> the Vapor Extraction Data Summary Table II following <br /> 1 <br /> 1 <br /> 1 <br /> I <br /> B 1125JI RPT 6 <br />