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California Regional Water Quality ont <br /> rol Board <br /> \■/ Central Valley Region <br /> Alan C.Lloyd,PhD Robert Schneider,Chair <br /> Secrcray for Arnold Schwarzeneggi <br /> ' Environmental 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 Governor <br /> Prorecrion (916)464-3291•Fax(916)464-4704 <br /> htt;21/w -sc cbc eo /nwccbt, <br /> ' TO: Brian Ne an, upervisory Water Resources Control Engineer <br /> UST Case File <br /> ' FROM: lames arB ton, Engineering Geologist <br /> DATE: 23 February 2005 <br /> ' SUBJECT: MEETING MINUTES FOR 1 FEBRUARY 2005, UNDERGROUND STORAGE TANKS, <br /> CLEANUP AND ABATEMENT ORDER(CAO)NO. 5-00-0707, FORMER UNOCAL STATION#5098 AT <br /> 5606 PACIFIC AVENUE,AND FORMER MONTGOMERY WARDS AUTO SERVICE AT <br /> 5400 PACIFIC AVENUE, STOCKTON, SAN JOAQUIN COUNTY <br /> Background: Ben Heningburg, ENSR International Inc. (ENSR,UNOCAL's consultant)called 31 January 2005 and <br /> requested a meeting with Regional Board staff, to introduce ENSR's Program Manager John Warren and discuss the <br /> status of the project. Prior to the meeting, I conducted a quick review of two documents received that day from <br /> ENSR, Updated Site Conceptual Model, Quarterly Monitoring and Status Report, Fourth Quarter 2004 <br /> Cr 6+ (4Q2004 Report) and Ozone Sparging Bench Scale Testing Results Report(BST Report). In addition to the <br /> ' routine groundwater monitoring for petroleum hydrocarbon concentrations,the 4Q2004 Report provides the first <br /> round of data collected to document existence of natural attenuation of petroleum hydrocarbons in groundwater,and <br /> recommends adding two additional air sparging wells to the Soil Vapor Extraction/Air Sparging(SVE/AS) <br /> Groundwater Treatment System(GWTS), to address deeper contamination emanating from UNOCAL's former <br /> station. The BST Report evaluates a Bench Scale Test conducted prior to a proposed pilot study involving injection of <br /> ozone into the aquifer formation, to enhance aerobic degradation of petroleum hydrocarbons. The BST Report <br /> requests a 60-day extension for submittal of a report for additional remedial alternatives evaluation, due to <br /> UNOCAL's decision to eliminate Ozone Injection as the chosen remedial alternative. <br /> ' Meeting: At 1300 hours on 1 February 2005, ENSR's John Warren, Ben Heningburg and Mark Nagle met with me to <br /> discuss changes in Project Management. John Warren,Program Manager will be the primary ENSR contact for the <br /> site. Ben Heningburg will continue temporarily in a supporting capacity. John explained that workloads were being <br /> shifted at ENSR to reduce caseload for their staff, in order to provide better customer service, and that UNOCAL had <br /> elevated the status of the project due to the complexity of the site. He said that they would continue to work with us <br /> towards site closure. <br /> I requested that the highest priority be given to restarting the failed SVE System, and secondly to addressing <br /> additional remedial alternatives to enhance reduction of contaminant concentrations. Ben stated that ENSR had <br /> ' submitted the application for the air permit to discharge to Granulated Activated Carbon(GAC) for the SVE System <br /> in the second week of December,but that the Authority to Construct(ATC) from San Joaquin Valley Air Pollution <br /> Control District(SJCAPCD)had not been issued. (In a subsequent email on 17 February 2005, Ben said the <br /> SJCAPCD inspected and approved the permit to operate the SVE System). <br /> California Environmental Protection Agency <br />