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ENSR AECOM <br /> REC ERNED <br /> ENSR <br /> 10461 Old Placerville Road,Suite 170,Sacramento,California 95827-2508 MAR _ 3 ZQQB <br /> T916.362.7100 F916.362.8100 w .ensr.aecom.com <br /> February 28, 2008 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. James L. Barton <br /> Central Valley Water Board <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> RE: 540015606 Pacific Avenue,Stockton, Califomia <br /> Former Montgomery Wards/Former Unocal Station#5098 (Chevron#306620) <br /> Cleanup and Abatement Order No. 5-00-707 <br /> ENSR Project 01231-154-R10 <br /> Dear Mr. Barton: <br /> ENSR Corporation (ENSR), on behalf of Chevron Environmental Management Company(EMC), is <br /> presenting to the Central Valley Water Board (CVWB)a tentative schedule to upgrade the remediation <br /> systems for the former Montgomery Ward, LLC (Wards) service station located at 5400 Pacific Avenue, <br /> and the former Unocal service station, located at 5606 Pacific Avenue, Stockton, California referenced <br /> collectively herein as the Site. Pursuant to the CVWB's request of a schedule for the installation of the <br /> upgraded air sparge (AS) and soil vapor extraction (SVE) remediation systems at the Site, below is the <br /> schedule that ENSR has established. <br /> Week of February 25, 2006 <br /> • Submit to the CVWB the tentative schedule (proposed fieldwork and reports)to upgrade the <br /> remediation systems for the Site <br /> Week of March 10. 2008 <br /> • Receive CVWB concurrence to the Air Sparge/Vapor Extraction System Remediation Design <br /> Plans(Design Plans), the August 2, 2007 Work Plan for Air Sparging/Soil Vapor Extraction Well <br /> Installation (Work Plan), and the addendum to the Work Plan <br /> • Submit permit application to San Joaquin County Environmental Health Department(SJCEHD) for <br /> the installation of air sparge and soil vapor extraction wells <br /> • Submit permit application(s)to building and planning departments <br /> Week of March 24. 2008 <br /> • Conduct pre-mob job walk <br /> Week of March 31 2008 (contingent on receipt of SJCEHD permits within 10 days of application submittal) <br /> • Install 6(six) air sparge and 3 (three) soil vapor extraction wells (drilling activities to be completed <br /> during the night time hours of 10:00 PM to 10:00 AM and anticipated to last 10 working days in <br /> duration) <br /> Week of April 7. 2008 <br /> • Anticipate receipt of building and planning department permits <br /> Week of April 14, 2008 <br /> • Commence field activities—decommissioning of existing systems, trenching, and piping <br /> installation (the field schedule for installation activities is based on the schedule received from the <br /> contractor who has been awarded the work) <br /> 01231-154 <br />