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'. Ms. Natalia Subbotnikova <br /> San Joaquin County Environmental Health Department <br /> ' December 1, 2011 Page 3 of <br /> The flush-mounted well cover and concrete pad will be removed. As discussed with you on <br /> ' November 4, 2011, each well will be pressure-grouted from total depth to near surface and capped <br /> with using Portland Type I/11 cement with approximately 3% bentonite powder. An approximate <br /> 2-foot-diameter area(measured from the well casing) will be excavated to allow for the grout cap. The <br /> ' approximate bottom of the excavation pit will be approximately 2 feet bgs,but no deeper than 4 feet <br /> bgs. The well casing will be cut to the depth of the bottom of the excavated pit. <br /> ' Soil removed from the excavation pit will be spread over the decommissioned well, if the soil contains <br /> less than 1% of visible solid waste. If the soil contains more than 1% visible solid waste, the soil and <br /> solid waste will be placed in appropriately labeled 55-gallon drums and stored on-site disposal at an <br /> ' appropriate off-site landfill. An SJCEHD representative will be present during well decommissioning <br /> activities. <br /> ' TABLE 1 <br /> Well Construction Details <br /> ' Borehole Casing Screen Total Borehole <br /> Diameter Casing Diameter Interval Depth <br /> inches Material inches feet bgs) feet bgs) <br /> ' MW-1 8 SCH 40 PVC 2 13-28 32 <br /> MW-2 8 SCH 40 PVC 2 10-25 25 <br /> ' MW-3 8 SCH 40 PVC 2 14-29 29 <br /> bgs = below ground surface <br /> SCH 40 PVC = Schedule 40 polyvinyl chloride <br /> Health and Safety <br /> ' URS will conduct a health and safety meeting with all field staff, including subcontractors, before <br /> field work begins. All field staff will be 40-hour Hazardous Waste Operations and Emergency <br /> Response (HAZWOPER)-certified. A copy of the Health and Safety Plan will be available on-site and <br /> is included as Attachment C. <br /> Report Preparation <br /> ' URS will submit a report summarizing field activities and providing documentation of well <br /> abandonment activities, including photographs, and the approved permit. <br /> ' H.\Wprocess\25532\WorldEnterprise\Well Destruction\Revised Report 12-1-11.doc <br />