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1.N.KLEIWELDER&ASSOCIATES <br /> P <br /> ® l aagppf[V8 Sa1t16Pg <br /> An endured draft vadose -t£.. .,at— h,s been it­Lled to <br /> �y emediate in-situ soil ntamrnated by a ls,king underground 9tarsge - <br /> taN,. The eyetem has been s c,,a,f ily demonstrated to extract gaaaline <br /> E� ,vapor trapped within the sub...ta soil matrtx, SoLl borings and ground <br /> j water manit,rtne sa <br /> g wells installed to derihe the ex ent <br /> sentamination. Th. lithgyes that the material in the vadose <br /> Ff ol, <br /> bas a relatively high porosity and permeability which to conducive to j. <br /> - <br /> t, jf'sub surf ace venting of the hydracarLo spill. <br /> A'vapor ex[raeti,n well(V1V)was in.e.LLed in the immediate vicinity of <br /> the an <br /> 4 cif rank va[ion, d three ir Inlet'Joe <br /> as to ra(A[P)were installed l <br /> ` ex a <br /> at di <br /> mdE 5, 10,And 20 feet from Lhe M, A eater-seal type vaeuwp i( <br /> fr lC Pum➢ was And fax Vapor extraetion. V-1_1 and horizontal ate tic <br /> li <br /> pressure profiles in,the vadose one, total pr,ma,rra at the inlet and <br /> outlet of the vacuum pump, te,opera[ure,hydrocatb,n....entrat ieh Ippmv} ' <br /> and vmlumetrie flawrates w-reeerded at regular interval,. The flowrat. -� <br /> 1� And statin pressure'sero regulated to meaavre their Daramstric genoltivity <br /> S an the overall extraction efficiency of the system. A depth-integrated <br /> fa equation wan developed based en hydrocarhon concentration profiles Eroe' i( <br /> s Boil borings to estihot, the total unt of gasoline present in the �1 <br /> -dos,eon.ba fore and after the soil venting eap.rie..t. �5 <br /> ' A betwean the artual rate of venting of gasoline from the <br /> I 19 asbaurface soil end that predicted from a dynemie liquid-vapor equilibrium <br /> 1T pwdel has atm,'been Jiucusz,d, The results of thin Sttdy indicate that <br /> j; with proper doaign, a rosswll efficiency, of greater than 90%can be - <br /> ` achieved. The artu.L rate of extraetion of gaseli f Lha oil wa6 t3 <br /> =e23 Lbefhr rn(averageve value leInduced soil ventiag 1 ost-e£fnetive �• <br /> meth sl alteatifer the r A ovei of hydrocarbona in Lh dose av <br /> 'yF�y 29-789 ( <br /> .f <br />