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+ u � Mr.Mike J. Infuma Jr. Del Monte Foods-Former Disco Site April 23,2010 Stockton, California Page 2 of 4 SCOPE OF WORK The scope of work will include the destruction of 59 monitoring and/or remediation wells installed within 40 boreholes. The wells will be destroyed by either pressure grouting, over boring (e.g., removing all material within original borehole), and/or down-hole wire line charge explosive well destruction techniques, as required by the SJCEHD. Well construction details and proposed well destruction methods for each well is summarized on Table 1. All well destruction activities will by completed by a licensed C-57 drilling contractor. Well destruction activities are detailed in the following sections. Permitting Prior to beginning work, well destruction permits will be procured from the SJCEHD, and appropriate encroachment permits will be obtained from the City of Stockton and Caltrans for activities that encroach into public right of ways. SGI will notify the SJCEHD and other necessary parties at least three days prior to initiating field work. Utility Surveys The well destruction locations will be marked using white paint. Underground Service Alert (USA) will be contacted at least 48 hours prior to sub-surface activities. A professional underground utility locating company will be utilized to delineate other potential buried utilities at on-Site and off-Site well destruction locations. Well Obstructions Prior to destroying any wells utilizing the pressure grout and/or down-hole wire line charge explosive well destruction techniques, SGI will remove any obstructions or significant sediment observed in each well casing. This will insure grout pumped into the well during destruction activities will infiltrate into the sand pack surrounding the screen creating an effective seal. Well Destructions- Pressure Grout q L 3 Off-Site monitoring wells (MW-DIS-8s, MW-DIS- MW-DIS-10, M.1-DIS-11S, MW-DIS-11D, MW-DIS-�2, W-DIS-13, MW-DIS-14S MW-DIS-14D and MW-DIS-15), off-Site ozone sparge `r ells OS-1-30/60/90 through OS-5-30/60/ 0), and on-Site monitoring wells (MW-DISTMW- GIS-17, and MW- -18) will be destroyed by pressure grouting. Casings ranging from 0.75 to 4-inch diameter will be grouted using a cement/bentonite-grout from the total depth of the casing up to two feet below ground surface (ft-bgs). Grout will be pumped into each location using a tremmie pipe at a pressure of approximately 150 pounds per square inch (psi) to insure sufficient distribution of the grout through well screens. The traffic rated well boxes will be removed using a jack hammer and the resultant void will be filled with concrete and matched with finished grade.