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( <br /> L N.KLEINFELDFIi&ASSOCIATES <br /> f� o She a;en can:rel valve end the ball valve in the tw-Inch bypass <br /> lk L line a left tally open.and the elec[ri..I cunneciion to the <br /> f puepa is au{t ch ed cn, once Ike air Elow hsa etabitiz¢d(indicated <br /> 6y t: <br /> ady reading,on the prose're gauge installed an the - <br /> crien eid. ofpump) the bypass line L.cle.ed very F <br /> l; almrly'which rr eeteau o vac vm En the vad.ae.one of the soil. - <br /> I' Stabilirattan typically [ekes .t-to three minutes. The vacuum <br /> is verified by the pre a gauge on the vapor <br /> extxaetian well. �j <br /> Ia m Goring the pilot-plant.tidy. IPI—ti vnai p 'elute are maasur¢d <br /> s.- !1 at ee h ampling part to avaluetn the effectiveneab-of the'vapor k> -.. <br /> extraction syet— 'These poroma_ ,e include: j{7 <br /> IF <br /> a by -b- rationil - Y <br /> l� b Air fl—'6 - p <br /> IH : 9 a[ie pre ti <br /> The hydrocarbon [tart E th aa..p i nerved and calibrated b'y 3 <br /> three differ ant ,hadsr f <br /> I f. <br /> ;t F <br /> Ff li � 1. Tne:Plp i i rt d di [lyi 0 .upli g location and tl,e - j! <br /> T' `J reading i 6.e—ed. <br /> The inl.t-of a m.11,v:11—pump i lad by a teflon tuba to '+ <br /> '( the aamVling, p rt. A tedlar beg 1 ?nnn t d-to the-tlet of. <br /> 1 <br /> theroam ppmy.rid ample-12-ted in[h tSlsr bag. Pield �+ <br /> ending. can then be taken with the PIp—4 the Drager tabu L <br /> tj la inatrvm nt. .The .-s—tube le.—..Led t h d held teiLow r1 <br /> ' pump and d{ -tly imllted-into the sampling port-Lo check for <br /> hydrocarb n cancentratinna. ' <br /> fl' ihn alp rostrum t (Ph.-­ In.,Model f TU)was d the primary <br /> �{ m -fiebd analytical ins Lrement for m so. <br /> ming the hyd ..boo concentration. <br /> She i tram..[ libr.e d rth—oair, 25 pp he nd 50 ppm <br /> butadiene.' She vat{ve response EecterB For d[fierere organic compoinda <br /> w - <br /> Vi 2.-789 <br />