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Traear Rwacmm t Carporetlon j <br /> I <br /> ambient air from above ;round through the system and comparing the <br /> analvsis to a concurrently sampled air analysis. <br /> All sampling and 2 cc subsa=Ung syringes are decontaminated each day <br /> and no such equipment is reused before being decontaminated. Microliter <br /> size subsampling syringes are reused only after a nitrogen carrier gas blark <br /> is run to insure a is not contatmnated by the previous sample. <br /> Soil gas pumping is monitored by a vacuum gause to insure that an <br /> adequate gas flow from the vadose zone is maintained• A reliable soil gas <br /> sample can be obtained if the vacuum pressure is 2 in. Ha less than the <br /> maximum pump capacity,which corresponds to an evacuation rate of>0.002 <br /> cfm <br /> r <br /> �i <br /> t� <br /> 6= <br /> 6 <br /> 6 <br />