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Mr. Harlin Knoll <br /> San Joaquin County <br /> May 21 , 1996 <br /> Page 2 <br /> casings and fill the pore spaces in the filter packs. The volume of cement grout <br /> necessary to fill well casings and gravel packs have been calculated for each well and <br /> are presented in the table attached to the workplan. Grout will be pumped into the <br /> well until pressure has stabilized or the calculated volume of grout has been installed. <br /> Cement grout will consist of Type 1/11 Portland cement mixed with no more than 6.5 <br /> gallons of water per 94 pound bag of cement and no more than 2% powdered <br /> bentonite to reduce shrinkage and cracking. Displaced water will be discharged to the <br /> ground. <br /> The monitor well vaults will be removed and disposed of in an appropriate manner. <br /> At all four wells the upper five feet of casing will be excavated and cut off. Cement <br /> grout will be installed into the top of the casing and allowed to "mushroom" over and <br /> cover the top of the casing. The excavation will be backfilled, compacted, and the <br /> ground surface restored to its original configuration. Areas around wells set in asphalt <br /> paving will be patched to match the original surface material as closely as possible. <br /> Well abandonment activities well be recorded by an on-site geologist. A report <br /> describing well abandonment activities will be prepared by HSI and submitted to FMC <br /> and San Joaquin County Environmental Health Division within 90 days of completion <br /> of field activities. <br /> If you have any questions, please contact me or Gail Bakker at (916) 853-1800. <br /> Sincerely, <br /> HYDRO-SEARCH, INC. <br /> Ross D. Atkinson <br /> Hydrogeologist <br /> RDA:vap <br /> Attachment <br /> cc: Mr. Chuck Epstein, FMC <br /> N81 HYDRO SEARCR i A Tetra Tech Company <br />