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I <br /> EN M- . <br /> f ENSR International <br /> 10411 Old Placerville Road <br /> Suite 210 <br /> Sacramento, CA 95827-2508 <br /> February 4, 2005 (916)362-7100 <br /> FAX (916) 362-8100 <br /> www ensr corn <br /> I <br /> Mr James L Barton <br /> Regional Water Quality Control Board <br /> Central Valley Region O <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670-6114 FEB a 20Q� <br /> ENVIRONMENT HEALTH <br /> RE U S Army Corps of Engineer Checklists PERMITISER%t10ES <br /> Former Unocal facility No 5098 <br /> 5400 and 5606 Pacific Avenue, Stockton, California <br /> Cleanup and Abatement Order(CAO) No 5-00-707 <br /> Dear Mr Barton <br /> On behalf of Union Oil Company of California (Unocal), ENSR Corporation (ENSR) is providing <br /> the completed U S Army Corps of Engineers (USACOE) Checklists and Guideline that were not <br /> included in ENSR's report Remedial System Evaluation / Comparative Analysis of Changes in <br /> Contaminant Concentrations, Distnbution and Mass within the Aquifer Beneath the Site (RSE) dated <br /> December 2, 2004 This letter and attachments are being submitted in response to Comment 1 in <br /> the California Regional Water Quality Control Board (RWQCB) letter dated December 23, 2004 A <br /> copy of the RWQCB letter is included as Attachment A <br /> The USACOE In Situ Air Sparging Subsurface Performance Checklist, dated June 7, 1999 and the <br /> USACOE Vapor Extraction Subsurface Performance Checklist, dated June 7, 1999 (Checklists) <br /> were cited as documents reviewed by ENSR dunng the preparation of the RSE Additionally, ENSR <br /> has attached a copy of the USACOE Example Remediation System Evaluation Ground Water <br /> Extraction System Report (Example) dated June 7, 1999 The Example was originally cited as <br /> USACOE Example Remediation System Evaluation Checklist dated June 7, 1999 in the RSE <br /> J 1ProjeMt 0694015098-2931Workinglcorrespondence15098 020405 Cvr Ltr to RWQCB USAGE checklists dot <br />