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® FZADIAN'IffTERNATIONAL <br /> A DAMES R MOORE GROUP COMPANY <br /> 10389 Old Placerville Road <br /> Sacramento,CaMomia 95827 <br /> RCN: 602237.020604 916 362 5332 Tel <br /> 13 December 1999 916 362 2318 Fax <br /> Mr. Harlan Knoll, R.E.H.S. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> SUBJECT: Well Abandonment and Installation Activities—Defense Distribution Depot <br /> San Joaquin (DDJC)-Tracy Site, Tracy, California <br /> Dear Mr. Knoll: <br /> Please find enclosed the permit application(s) and payment for the abandonment of three <br /> injection wells at the DDJC-Tracy Depot, located in Tracy, California. Included in this enclosure <br /> is the plan under which the work will be conducted. In the work plan, you will find a figure <br /> showing the location of the wells and construction diagrams of the injection wells that are to be <br /> abandoned; abandonment activities are summarized below. <br /> Monitoring well installation activities that are included in the enclosed work plan will be <br /> performed under the current well installation permit (#018554) dated 3 March 1999. Well <br /> drilling and installation procedures are included in the work plan. <br /> Injection Well Abandonment <br /> The injection wells will be pressure grouted. A tremie pipe will be inserted into the well and <br /> placed near the bottom of the well. The grout will be placed in lifts, and groundwater removed <br /> from the well, as a result of grout placement, will be collected at the surface and stored for future <br /> disposal. The grout consists of a mixture of 96 pounds of Portland cement, 7 gallons of water, <br /> and approximately 5% bentonite. The total depth of each well is 100 feet, and it is anticipated <br /> that a minimum of 150 gallons of grout will be needed to complete sealing of the well casing. <br /> Each injection well is located inside a 4'x 4' concrete vault. The vaults will be removed through <br /> use of a backhoe or another type of excavating equipment as part of the abandonment activities <br /> and will take place after each well has been grouted to within 5 feet of the ground surface. After <br /> removal of the concrete vaults, the area surrounding the well will be restored to its condition <br /> prior to installation of the well. This will be done by bringing in backfill soil, topsoil, and sod, if <br /> necessary. <br /> Offices woddwide <br />