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Elh0to <br /> ENSR International <br /> 10411 Old Placerville Road <br /> Suite 210 <br /> June 14, 2004 Sacramento, CA 95827-2508 <br /> ' (916)362-7100 <br /> FAX (916)362 8100 <br /> www ensr com <br /> Mr James Barton MECIEV�t" <br /> i California Regional Water Quality Control Board v I� <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 SUN s 2004 <br /> Rancho Cordova, CA 95670 ENVIRONMENT HEALTH <br /> PERMIT/SERVpCES <br /> RE, Work Plan and Schedule to Cease Plume Movement and Define Plume Limits <br /> within the B -Zone <br /> Former Unocal Facility No. 5098 <br /> ' 5400 and 5606 Pacific Avenue, Stockton, California <br /> Dear Mr Barton <br /> On behalf of Union Oil Company (Unocal) of California ENSR Corporation (ENSR), has <br /> prepared this work plan for the Former Unocal Station No 5098 at 5606 Pacific Avenue, and <br /> ' Former Montgomery Wards (Wards) Auto Service located at 5400 Pacific Avenue, Stockton <br /> California The location of the site is shown in Figure 1 and site features are illustrated on <br /> Figure 2 <br /> Wards and Unocal are named jointly responsible for actions necessary to abate the effects of <br /> contamination in the vicinity of the sites In August 2000 Wards and Unocal executed an <br /> ' agreement for Coordinated Corrective Action for Underground Storage Tank (UST) Fund Claim <br /> No 1760 and UST Fund Claim No 6864 On November 2, 2001, Unocal was named as the <br /> Appointed Representative for the PACIFIC/ROBINHOOD COMMINGLED PLUME In this work <br /> plan, reference to the "site" includes the former Wards and Unocal sites This work plan <br /> summarizes environmental investigations completed to date and proposes a remedial approach <br /> and schedule to address remaining hydrocarbons in groundwater The California Regional <br /> ' Water Quality Control Board, Central Valley Region (RWQCB) requested this work plan in a <br /> letter dated, May 13, 2004 A copy of the RWQCB letter is included in Attachment A <br /> SITE STATUS SUMMARY <br /> The site is located in a commercial business and retail shopping district The site currently has an <br /> active air sparge remediation system and an inactive soil vapor extraction remediation system <br /> Wards and Unocal are named jointly responsible for actions necessary to abate the effects of <br /> contamination in the vicinity of the sites, in CAO No 5-00-707 dated, September 8, 2000 In <br /> August 2000 Wards and Unocal executed an agreement for Coordinated Corrective Action for <br /> Underground Storage Tank (UST) Fund Claim No 1760 and UST Fund Claim No 6864 On <br /> November 2, 2001, Unocal was named as the Appointed Representative for the <br /> PACIFICIROBINHOOD COMMINGLED PLUME <br /> Wards formerly operated an auto service center at 5400 Pacific Avenue, Stockton, California <br /> k Between 1986 and 1988, Wards removed one waste oil UST, four bulk oil USTs, and two gasoline <br /> J 1ProjectsW694015098 2931FinaRReports15098 Work Plan doc <br /> 35 Years of Excellence in Environmental Services <br />