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Y—y <br /> s r <br /> 14 November I995 <br /> AGE-NC Pro' <br /> pp * t No 95-0121 <br /> r PaOe l 4 of+y jec�o r < <br /> IAS induces the <br /> cr transfer of hydrocarbons from <br /> �g a strong concentration ' <br /> i, surround gradient between Found water to sail <br /> tie below by sP�iically deliair een the two rues Co gas in the vadose zone b ' <br /> ground water) A gn� lection wells that Commonly,, an extraction w y <br /> Pressure into the saturat capacity blower are��'ed only within the ell is <br /> k ed zone Producin connected to the in' saturated zone <br /> ad water and nSe to the air g air ch eels`that stn jection wens forces air under <br /> Y carbons are drawnwater p dissolved con <br /> into the ice upon reaching the unsaturated zone,, <br /> &orn the <br /> Potential extraction well by the subsurface air flow <br /> ey the volatilized , <br /> i <br /> induced by the vacuum <br /> 71 2 BASIC SYSTEMDESIGN <br /> Injection ' <br /> wells are screened r <br /> perhaPs S to i o feet within the saturated <br /> ' pressure is the least, little is most of the zone <br /> and normally f _ f <br /> air escapes from the u Y have short screen <br /> gained by ink eosin pper Part of the intern intervals <br /> S the len al where head <br /> ed <br /> The radius Ofinfluen length Of the screen terval <br /> well San ce ofa spargrn <br /> �'soil types tend to r 8 well is dependent do site lithoid <br /> a more limited radius of, Produce a lar Sy and the depth of the spar. <br /> nfluence ger radius ofin fluence, c1a clayey y soil �g <br /> t t. Unless In ection types tend to produce <br /> contantination wells are <br /> packets may Properly located, channeling ' <br /> retarded PermeabilityW"h low er bypassed This problem is of air flow sire <br /> are interbedded more co ams may occur and <br /> within the fine_ with coarse- inion where fine- <br /> gra,ned strata, acid h grained strata m the saturated gr'amed strata ` <br /> ' None of the re hydrocarbon <br /> recoyeiy is poor turated zone Air now is <br /> require the Present wells at the site are sortable for air s <br /> 4o feet bsmstallation of , <br /> $ At least four <br /> and Ib injection Peng Use of this technology ' <br /> Cansid Sig prints should bet 1�screened <br /> at a de &Y would , r <br /> enng the relatively clayeyoff-site, east of between 35 and <br /> cone of influence of a nl sari at the site, we estimate that these wells <br /> extraction to contain vapor 20 to 25 of the Property <br /> apor strip <br /> feet in diameter IAS must beocomb nedcreate ' Inverted <br /> Piled from the ground water � ` <br /> I with vapor <br /> -14ONI <br /> TORV�4e <br /> G,ACTIVITMS <br /> One potential , <br /> Plume Problem associated with air <br /> This Is due either <br /> to rt�oundin ��g Is inadvertent lateralspreading <br /> g afgi-od water <br /> ,�, s fromsPg,wefls To deter this robl above injection of the contaminant <br /> (ce oPropnate)should be monitor em, ground water depths in monitas or Lateral air D <br /> Presence of or ed on a monthl °W away <br /> ganic vapors Y basis (minimum r'nS wells and em actlon <br /> ' ) to detect <br /> mounding. g and the <br /> , <br /> l <br />