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a <br /> mom <br /> ADDENDUM TO REMEDIAL WORK PLAN <br /> for <br /> For-Aer Mobil Service Station d 10-NP4 <br /> Z r <br /> 2375 Tracy E <br /> Tracy, California <br /> Project No. 30-0140-01 <br /> SEP 1 7 i,99;1 <br /> 21 <br /> BACKGROUND <br /> ined by Mobil oil Corporation to <br /> Alton Geoscience was reta <br /> Jan to address the petroleum <br /> prepare a remedial work pwater <br /> hydrocarbon constituents2375in tTrahe cyoBoalevard,aTracy,er Mobil <br /> Service Station 1remed resenting the selected <br /> California. The remedial work plan pound water at the site <br /> course of action for rem,quirements ion of of the Regional Water <br /> in accordance with the req Region RW CB and the <br /> Quality Control Board, Central Valley Joaquin <br /> { n } ° <br /> was submitted on April 5, 1991- <br /> Health <br /> HeaSJCPHs)�sion of San Joaquin County Public <br /> Health Services <br /> REvISION TO REMEDIAL WORK PLAN <br /> The proposed remedial option is to install an automatic <br /> recovery system (ARS) to recover and treat ground water with <br /> dissolved-phase petroleum hydrocarbon constituents beneath <br /> the site, Basrecent <br /> ed on the results ofFV� tsw,othesfollowing two <br /> quarterly monitoring and sampling <br /> changes to the ARS are recommended: <br /> 1. Previously it was desired to use existing ground water <br /> ue to the <br /> monitoring well <br /> MW-5tes fhthisrecoveryge ra. <br /> well. D <br /> well, itsusewould not <br /> very low <br /> produce a sufficient capture zone to control the onsite <br /> dissolved-phase plume. <br /> To increase recharge charact <br /> system, a new four-inch-diameter receristics of thWeP w°lld:�e <br /> recovery <br /> ll well <br /> it the <br /> installed within the existing <br /> intersection of two storm drain liSee Figureh1). This <br /> northeast corner of the property <br /> method will provide the following benefits: <br /> allow use of OfPstorm drain grbackfill <br /> ound water sincetheaconduits a <br /> groundwater <br /> _: . . <br /> for recovery <br /> . <br /> -elevation hikely--lies--within._the storm drain ac a. <br />