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AME <br /> .>, Engineers and Earth Scienfists <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 /> t 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/II 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 /> ©2011. Georgia-Pacific LLC.All rights reserved. <br /> U:\2011 Letters and Reports\16014.01\Work Plms\Revised Well Destruction\Work Plan.doc <br /> ' Acton • Mickelson • Environmental, Inc. www.ameinc.net <br /> 1107 Investment Blvd,#290 (916)939-7550 <br /> EI Dorado Hills, California 95762 Fax(916) 939-7570 <br /> 1 <br />