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AME �\ ` <br /> Engineers and Earth SclenRda <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 I/11 cement grout tremmied into the well to <br /> a depth of 2 feet bgs. The baring will then be filled with clean,uncontaminated fill material from <br /> 2 feet bgs to ground surface. <br /> ©2011. Georgia-Pacific LLC.All rights reserved. <br /> D\2011 Letters end Reports\16014.01\Work P1ans\Revised Well Destmction\Work PIM doc <br /> Acton •Mickelson • Environmental,Inc. w .omelnc.net <br /> 1107 Investment Blvd,#290 (916)939.7550 <br /> EI Dorado Hills, California 95762 Fax(916)939-7570 <br />