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Chevron <br /> Stephanie A. Furgal Chevron Environmental <br /> Lft Project Manager Management Company <br /> Marketing Business Unit 6111 Bollinger Canyon Road, <br /> Room 3652 <br /> San Ramon, CA 94583 <br /> Tel (925) 543-2349 <br /> Fax (925) 543-2323 <br /> sfurgal@chevron.com <br /> October 30,2008 <br /> Margaret Iagorio,REHS <br /> Program Coordinator Unit IV <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton,CA 95202 <br /> Re: Conversation Documentation <br /> Former Unocal Service Station 2859 <br /> 1665 Pacific Avenue ? <br /> Stockton,California " , <br /> g..I <br /> Former Unocal Service Station 0187 <br /> 437 E. Miner Avenue <br /> Stockton,California <br /> Dear Ms. I,agorio, i l'� 3f I <br /> I have prepared this letter to document our telephone conversation on Octobei,29',2008 regarding former Unocal <br /> service station's 2859 and 0187 located at 1665 Pacific Avenue and 437 E. MineriAvenue,respectively,in Stockton, <br /> California. The purpose of this telephone conversation was to`discuss the letters,lfrom the San Joaquin County <br /> Environmental Health Department(EHD).for former Unocal service-stat on 2859 dated October 22 and former <br /> Unocal service station 0187 dated-October 23,2008. � <br /> it <br /> Pursuant to our telephone conversation,Chevron has directed its consultant,ARCADIS,to provide an amended <br /> work plan for former U on cal service statioW2859 to the EHD`pr or to November 21,2008 (within 30 days of <br /> October 22,2008). The amended work plan will include the following: <br /> • Technical,-ju"stification for locations <br /> inc ludiiig.ympacted source areas(e.g.VW-2 and others)and depths of <br /> : W .. ,i t <br /> proposed soil-vapor probes including proposed construction installation and completion details <br /> • Additional deep borings;.(terminating-at approximately 51'feet below ground surface [bgs])in areas of <br /> Jci bwn impacts to fuith d7 6fine the-,e,A-al and lateral extent of soil impacts in the apparent source area <br /> (he the former eastern dispenser island near VW-2) <br /> • TechrzicalJustification for€ epth•specific groundwater sampling using Snap Samplers in MW-2 <br /> ca; <br /> • Technical)justification for not restarting the ozone sparge system <br /> • Technical justification for•the collection of additional data to assist in the evaluation and selection of a <br /> remedial optlbd t6expedite site cleanup(a list of potential remedial alternatives being considered for pilot <br /> testing at the site will,b6 included)' <br /> s <br /> In addition,Chevron has directed ARCADIS to provide an amended work plan for former Unocal service station <br /> 0187 to the EHD prior to November 22,2008(within 30 days of October 23,2008). The amended work plan will <br /> include the following: <br /> • Technical justification for the installation and sampling of new vapor probes versus the reuse of existing <br /> probes and a work plan to properly destroy the previously damaged vapor probes currently onsite <br />