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Ms. Victoria McCartney May 27, 2008 CONESTO 3A-ROVERS &ASSOCIATES PROPOSED SCOPE OF WORK CRA proposes to abandon tengroundwater monitoring wells according to the State of California Well Standards. Upon completion of this work,CRA will submit a We]]'Destruction Report to the San Joaquin County Environmental Health Department and will submit Well Completion Forms to the California Department of Water Resources. CRA proposes to perform the tasks described below. Underground Utility Location:CRA will notify Underground Service Alert of the drilling activities to identify utilities in the drilling area. Three borings around each well.will be cleared to 8 feet below grade using either air or water evacuation of the soil or by hand augering. Site Health and Safety Plan:CRA will prepare a site safety plan to protect site workers. The plan will be kept onsite at all times and signed by all site workers. Permits:CRA will obtain well abandonment permits from San Joaquin County Environmental Health Department prior to beginning field operations. A minimum of 48 hours of notice will be given to San.Joaquin County prior to beginning drilling activities. Monitoring Well Destruction:. CRA will properly destroy ten groundwater monitoring wells(MW-1,MW 2,MW-3, MW-4, MW-5S, MW-5D, MW-6S,MW-6D, MW-7D, and MW-8). The wells will be cleared to 8 fbg using an air vacuum truck or hander and the wellbox will be removed. Once cleared,the wells will be drilled-out to the total ----- - depth of each well,using 8-inch diameter,hollow-stem augers. After each well is drilled out,the boring will be tremie grouted with Portland cement, and finished to match existing grade. Standard field procedures are presented as Attachment B. Soil and Water Disposal: Soil cuttings generated during abandonment will be stockpiled in a soil bin onsite pending analysis and proper disposal. Any waste water generated by the abandonment activities will be stored in drums pending proper disposal. �- Reporting: After the wells have been properly abandoned, a well abandonment report will be prepared that, at a minimum, will contain: • A summary of the well abandonment activities, • Analytical reports and chain-of-custody forms for the soil disposal, and • Soil and water disposal methods. 4 Worldwide Engineering,Environmental,Construction,and IT Services