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Report-Monitoring Well Abandonment Page 3 <br /> Former Karlson Trucking <br /> / Project No. 191.2 <br /> August 6, 2002 <br /> 2.0 Well Abandonment <br /> The following sub-sections describe the work completed to properly abandon <br /> the four groundwater monitoring wells. <br /> 2.1 Preparatory Work <br /> An application for a permit to abandon the wells and a Work Plan describing <br /> the field procedures was submitted to the SJC-EHD on July 2, 2002. The <br /> Work Plan was approved and the permit issued on July 5, 2002. The SJC- <br /> EHD was notified that the final well abandonment was scheduled for August <br /> 1, 2002. <br /> On July 26, 2002, Geo-Phase Environmental Personnel mobilized to the site <br /> for the purpose of exposing the wells and removing the concrete collars <br /> around the traffic rated well boxes. The concrete collars were broken out <br /> using a sledge hammer. <br /> 2.2 Pressure Grouting <br /> On August 1, 2002, V&W Drilling (C-57 # 720904) mobilized to the site for <br /> the purpose of abandoning the wells. The following steps tasks were <br /> performed to complete the well abandonment by pressure-grouting. <br /> The well boxes were completely removed from the wells except for MW-1, <br /> which was set into a large concrete pad. In this case, the lid of the box was <br /> removed and the main part of the box was left in place. The locks and caps <br /> were removed from each well. <br /> V&W Drilling personnel prepared neat cement for use as grout. Each well <br /> was sequentially fitted with a 2-inch pressure cap. Neat cement was then <br /> pumped into each well using a pneumatically actuated grout pump. Pumping <br /> continued until a positive pressure of at least 5 pounds per square inch was <br /> reached at each wellhead. The volume of grout pumped was monitored to <br /> verify that sufficient grout was used to completely fill the casing and the <br /> sand pack around the perforated intervals. The diameter of the drum from <br /> which grout was pumped, was measured as was the height of grout in the <br /> drum before and after pumping. These figures were then used to calculate <br /> the volume of grout pumped into each well. <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto, Ca 95356 Fax: (209)569-0295 <br />