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`JMi <br /> WIN- __ _ _ _ ,—. �.C."$ �'93G'��'A�rab=.=`-� ".•.zs-d+:iGwT..r.n'-.. - <br /> 'Prager Research Corporation <br /> son j <br /> I RIZ sampling and 2 cc subsam lin �•�• <br /> +' nated each da and p g syringes are decontami-- <br /> Y no such equipment is reused before being <br /> decontaminated. microliter size subsampling Syringes <br /> f j reti=ed only after a nitrogen carrier gas blank is run ta � <br /> }:1. i irssure it is not contaminated by the rev" <br /> R nous sample. <br /> • Soil gas pumping is monitored b a <br /> that an adequate .gas flow from the vacuum gauge to insure <br /> Ina ntained. R negativePressure vadose zone, is � <br /> less than the maximum capacifrf(vaceaum) of. 2 in. H I <br /> Y t.ie pump (evacuation <br /> rate >0.02 cfm) .usuall•i <br /> indicates <br /> sample that a reliable gas ' <br /> —. P cannot be obtained because the sail has a very low <br /> ai: permeability. <br /> I <br />`r <br /> � r ' <br /> � <br /> fir, 7 i <br /> h <br /> JJ <br /> o F= <br /> i <br /> } i <br /> '! <br /> y:� it1 <br /> L � L <br />