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28 October 1997 <br /> AGE-NC Project No.95-0103 <br /> Mr. Russell Chapin <br /> CHAPIN BROTHERS INC. <br /> 1203 North Caftan Aveme <br /> Stockton.,California 95203 <br /> Subject. Seil-Yapor P*=d lAir-Sipw&X-., loe-States Update <br /> CH"11K BRO RS INC. <br /> 17"Moate Diable Avenue,St en,Callt ru is <br /> Dear Mr.Chapin: <br /> In x*x dance with your request,we.are pt+oviding.the following update eonoorning the opemdon of <br /> the.SVE unit and the remediation effectivenoss.et the st*ject site: <br /> SITE CONDMONS <br /> • Betwm the time of p mpantion of the Problem Ammm" Rept (PAR) and Final <br /> Ramon Plan(FRP)and the initiation of the recommended and approved remediation <br /> tecimolov at the site,.the elevWon of ground water increaacd dza "caliy.The reduction <br /> Of ZhC v8ti08e 20W,or Vx6ce area of expand soil to air,has wed the pr*aed$ell <br /> vapor removal effectiveness and dutudon.Sail exposed with the.cuaW ground wetter doth <br /> is fly$&.and claY,while y soil was exposed during the fmsibiility feeling at the <br /> site.This reduction of the P=MW'soil expo W to the SVE well=am and SVE network <br /> has increased the resistance of the hydracafion vapor movement out of the soils. <br /> • Due to the Wamood gwmd water elevates, the a NORty of the hye>iocarbw impacted soil <br /> at the site. is currently beneWh ground water, increasing the need for the stripping of the <br /> hydbons from the aged soil by in-situ air spng(IASL,and womimg the effirt <br /> and time.for the overall removal of hydrocarbons from the aged impacted tails. AS <br /> has doweascd the eoi�cen tions of hydrocarbons in sigaifics�ntly impacted ground water <br /> monitoring wells. <br /> t 'd S t t t L9V 602 HNOd i ANMM SAM.kU WdeS' L L66 l-62-0 t <br />