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r 26 July 2011 AGE-NC Project No. 95-0137 Page 3 of 3 All original well construction materials will be removed (including well casing, screen, filter pack, and annular seal) to ensure that no residual contamination is sealed within the abandonment borehole. The remaining borehole will be backfilled to surface grade with neat cement and covered concrete mix or native dirt, 'depending on the surrounding surface material. # x - Well boxes and caps will be removed to expose the well casings of non-impacted wells. The well heads will be fitted with a pressure tight adapter,'connected to a hose extending from a grout mixer. A 'thick grout mixture will be pumped into the well casing under approximately(10 pounds per square inch (psi) of pressure. The well will then be over-drilled to approximately 3 feet bsg using eight ;inch .`or or ten-inch diameter hollow-stem augers and a hole one-foot larger will be excavated. The top 2.5 feet of the well casing will then be cut and grout-will be used to'[fill thi,e base of the boring to approximately 0.5 feet above the top of the well casing. The remaining borehole will be backfilled to surface grade with dirk or cement and asphalt; depending on the surrounding surface material. Soil cuttings generated during drilling activities and rinseate will be containerized in landfill I appropriate disposal container, 55-gallons drums and stored on-site for disposal, in an area lacking public access. Upon completion of field work and disposal of soil-cuttings, a,Mell Destruction Report describing well destruction activities and procedures, including documentation of waste disposal from well destruction and other activities, will be"prepared and submitted to the EHD. If you have any questions or require further information, please contact our office at (209) 467-1006. Sincerely, Advanced GeoEnvironmental . g �rtsS1QNAL No,7473 William R. Little Senior Project Geologist �T'_OF cn��°��`P California Professional Geologis 473 Enclosure - maps cc: RFS Land (Ripon Farm Service) ;yAdvanced GeoEnvironmental,Inc.