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ENVIRONMENTAL HEALTH DTVI ON <br /> 304 E. Weber Ave.Third Floor Post-it®Fax Note 7671 Date Pages► I <br /> P. O. BOX 388, StpC on CA 95201-0388 To From <br /> Denieded J Lg coep. c . L- <br /> 23/1 <br /> Conditions ❑ Phone# Phone#0 <br /> 4�r „ - O-L,L <br /> Fax# Fax# lJ� f� <br /> Date by <br /> AM-M-1997 16.53 FRW GEOLOGICAL TECFNI6 TO d6401M P.B2 <br /> GeO4Tech4kj Inc. <br /> 2._4I R& AI f ' <br /> xerft c fi w xxur <br /> fmx�ss;csx�ss�sxu <br /> Z �J� April 21,1997 <br /> ProjatNo.: 251.1 <br /> ./Y Project Name: Fon=Moresco Property(Gawne Rd) <br /> Mr.Ran Rowe <br /> San Joaquin Comity Public Health Services <br /> Environmental Health Division <br /> 304 S.Weber Ave.Third Flow <br /> PA Box 389 <br /> ru ice' StoddDa,CA 95201-0398 <br /> IZt'�"(A2X�� ��l RE: Addendum to Interim Remedial Action Plan-4AM <br /> ��� p�. Faamer Moresco Properly,16865 Gawne Road,Stockton,CA <br /> L3 J Dear Mr.Rowe: <br /> On behalf of Michael D.McGraziahan,Trustee,we hove prepared this Addendum to Geological <br /> Technics Inc April 8, 1997 Interium Remedial Action Plan,for the Former Moresco Property, <br /> I6865 Gawne Road,Stockton,Califomia This addendum addresses the comxmrfs you expressed <br /> Zin your fax dated April 11,1997 with regards to soil remediation by vapor cxftwban. <br /> � 4 ` IA Pars Velemer Sud Pore Vohrme Ezchange hates <br /> �.) S w Pore Volume <br /> We estartated pore volume in the errs around is propos vapor eutrachon vMU at 50,893 ft. <br /> ` Vohnne=(R)(0)(b)(n) <br /> !C� • r(radius)—30 feet distance farm the extraction well to the farthest recharge well. <br /> I'e`- . b Mcimeas)=45 feet <br /> L3�' S a a(Patasity)=40 94,ranged 6om 36 to 49% <br /> Pore Volume Exrhemme Rabe <br /> The Thermal Oxidizer (It7) is equipped with a blower resod of 250 SCFM which is the <br /> equivalan of 360,OW cubic Cut per day. This volume i9 7 titnts greater then the requested <br /> exchat]ge sale of l dame vpltmte per day. However, past experience with vapor extraction <br /> TD systems equipped ands TO Srmts has shown that typically for dee fust several weeks it is not <br /> system at 100% cxwac&m from the subsurface becat v of the anoxic <br /> ,"v �/3 l/ condiE3ams in the subsorfaca Thep must first be run at partial extraction nsm'l: <br /> 1. Enough wWpen is added system <br /> subsurface through the passive recharge wells to allow <br /> for a complete bum in the TO. <br /> 2. The txtcxt wly high concentrations of gaeoline vapor have beta removed to allow the <br /> Tb to be run at fixil capacity with out aver heating. <br />