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10 <br /> California�egional Water Quality Con 1 Board <br /> Central Valley Region <br /> Karl E.Longley,Sc D,P.E.,Chair <br /> Linda S. AdamsArnold <br /> Sacramento Main Office <br /> ' Secretoryfor 11020 Sun Center Drive 4200,.Rancho Cordova,California 956706114 Schw <br /> Environmental phone(916)464.3291 •FAX(916)4644645 Governor <br /> negger <br /> e <br /> Protection hnp://www.waterbouds.ca.gov/ccntralvallcy <br /> 21 December 2007 <br /> Ms. Stephanie Frugal Mr. Jay Allen <br /> ' Chevron Environmental Management Company, Stone Brothers Management Company <br /> 6001 Bollinger Canyon Road 1024 W. Robinhood Dr. <br /> San Ramon, CA 94583 Stockton, CA 55207 <br /> ' DOCUMENT RW EW, CLEANUP AND ABATEMENT ORDER:(CAQ) NO. 5-00-0707, <br /> FORMER UNOCAL $.T�ATION#5098 AT 5606 PACIFIC AVENUE, AND FORMER <br /> MONTGOM01k?Y.WAHCJS.AUTO SERVICE AT 5400 PACIFIC AVENUE, STOCKTON,; <br /> SAN'JOA QUIN CQtjkTY, <br /> I reviewed the.Remedial Design Plans,(Attachment A) and Work Plan for Air Sparging/Soil <br /> ' Vapor Extraction.Well Installation (Attachment 8) submitted in the document titled <br /> RE: 5.400/5606 Pacific.Avenue, Stockton (Workplan), and received on 6 Dqcembpr 2007 from <br /> ENSR, the consultant for Chevron Environmental Management Company ((EMC)._The <br /> ' Workplan was submitted following a meeting with Regional Board and ENSR staffs on <br /> 14 May 2007, in which I questioned the efficiency of the existing air sparging/soil vapor <br /> extraction (AS/S,VE)treatment system. At that Kme, ENSR responded that, prior to conducting <br /> ' optimization of the existing AS/SVE treatment system, ar!`e:aluation,would be conducted and <br /> recommendations Would be,sybmitted to the. Regional tloard. <br /> Y <br /> t The Workplan states that redesign of the existing AS/SVE system is necessary, due to fact <br /> that "...operating pressures of the existing AS may not have been sufficient to achieve <br /> breakthrough for each of the operating wells." The Workplan adds that a"Perforrnance <br /> Monitoring Plan (PMP) will be submitted after construction of the new AS/SVE system. The <br /> PMP will propose that six months of data (field and analytical) "...be compiled and submitted <br /> as an evaluation separate from the quarterly monitoring data." <br /> 1 Attachment A includes eighteen pages of professionally stamped specifications and drawings <br /> for the proposed construction activities. Attachment 8 proposes six tasks for the installation of <br /> ' six additional AS wells 1.(AS-14 through AS-21) and three additional SVE wells (VEW-16, <br /> VEW-19, and VEW-22), includes the removal and relocation of the existing equipment in the <br /> treatment compound, and retrenching from the treatment compound to the wells for <br /> ' installation of new piping. <br /> ' RECEI:VF-,D <br /> DEC 2 8 2007 <br /> ' BY: <br /> California Environmental Protection Agency <br /> p�Ad Recycled Paper <br />