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r AME <br /> Engineers and Eadb Sdenfids <br /> June 14, 2011 ' <br /> Mr. Gerald Djuth, C.E.G.,P.E. <br /> California Regional Water Quality Control Board ' <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova,California 95670-3291 16014.01/1 <br /> Subject: Revised Work Plan for Well Destruction <br /> Former Georgia-Pacific Tracy Chemical Packaging Plant <br /> 75 W. Valpico Road,Tracy,California , <br /> Dear Mr.Djuth, <br /> On behalf of Georgia-Pacific, LLC (G-P), in compliance with the California Regional Water ' <br /> Quality Control Board, Central Valley Region (RWQCB) letter dated April 26, 2011, Acton • <br /> Mickelson • Environmental, Inc. (AME) has prepared this Revised Work Plan for Well <br /> Destruction (Work Plan) for the former Tracy Chemical Packaging Plant located at 75 W. ' <br /> Valpico Road, Tracy, California (site; Figures 1 and 2). The drilling activities described herein <br /> are part of well destruction activities that will be conducted at the site in general accordance with <br /> San Joaquin County Environmental Health Department(San Joaquin County) requirements. Soil <br /> and ground water at the site had been impacted by chloroform from past operations;however,the , <br /> RWQCB has found that no further action will be required after the 33 existing site wells have <br /> been destroyed. <br /> OBJECTIVES ' <br /> The objective of the work described herein is to destroy 21 ground water monitoring wells and <br /> 12 ozone sparging wells by over-drilling. , <br /> SCOPE OF WORK <br /> It is proposed that the 21 monitoring wells(ranging in diameter from 2 to 8 inches and extending , <br /> from 28.5 to 82.0 feet below ground surface [bgs]) and 12 ozone sparging wells (0.75 inches in <br /> diameter and extending from 67.5 to 73.0 feet bgs)be destroyed by over-drilling using augers to , <br /> a depth 1 foot greater than total depth, effectively removing all material within the original <br /> boreholes. The borings will be backfilled using Type Ull cement grout tremmied into the well to <br /> a depth of 2 feet bgs. The boring will then be filled with clean,uncontaminated fill material from <br /> 2 feet bgs to ground surface. , <br /> 0 2011. Georgia-Pacific LLC.All rights reserved. ' <br /> U;V011 Letters and ReportA16014.011Work Pla tsaevised Well DesnotionMork Plan.doc <br /> Acton •Mickelson • Environmental,Inc. www.ameinc.net <br /> 1107 Investment Blvd,0290 (?l 6)939.7550 ' <br /> EI Dorado Hills,California 95762 Fox(916)939-7570 <br />