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Proiect Number 1804BK54 April 11,2013 2.2.1 Well Abandonment Methods and Procedures Environmental Control Associates, Inc. (ECA) of Aptos, California (C-57 License #695970) will perform the well abandonment activities. The abandonment activities will be overseen by E2C field personnel, under the direction of an E2C California Professional Geologist or Professional Engineer. Abandonment will be conducted as follows: ■ All wells will be pressure-grouted. Pressure Grout Method The pressure grout method consists of the following procedures: ■ Each well will be filled with neat-cement grout by placing a tremie pipe at the bottom of the well and pumping cement grout down the well; ■ Once filled with grout, each well will be pressurized to 50 pounds per square inch (psi) with air and the pressure will be maintained for 15 minutes; ■ The protective well head box of each well will then be manually removed and the upper 3 feet of the borehole will be drilled out using 8-inch or 10-inch augers; ■ Well DW-41313 is set inside a steel conductor casing. That casing will be cut off 3 feet bgs using a torch, or casing cutter tool; ■ The drill cuttings and wellheads will be removed and stockpiled for disposal at the local landfill; and ■ The upper 3 feet of the borehole will be backfilled in accordance with City of Lodi permit specifications. 2.3 Task 3 -Piping Abandonment Piping connecting vapor extraction and air sparge wells to the former remediation compounds will be left in place and the ends will be capped with a concrete plug. The manifold piping at each equipment compound will be cut off at ground surface and each pipe will be capped with a concrete cap flush with the ground surface. 2.4 Task 4 -Reporting Following the completion of the field activities a Site Decommissioning Report of Findings will be prepared by E2C. The report will document all well destruction and site decommissioning activities. The Report will be prepared by, reviewed by, and certified by a State of California Professional Geologist or Engineer. E2C Remediation 3