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1 ' Mr Michael Inf ima 2 May 28, 2004 indications of fuel product or dissolved fuel constituents were observed during either sampling ' event Copies of the well installation logs are included in Attachment 2 Well locations are depicted in Figure 2 Based on the lack of petroleum analytes detected in the monitoring well groundwater samples, the relative immobility of the remaining heavy-end petroleum hydrocarbons (if any) and the overall depth to groundwater, the site was recommended for case closure, with no further action ' recommended The SJCEHD requested the submittal of a workplan for well abandonment prior to granting case closure The following sections outline the well abandonment field activities ' SCOPE OF WORK Methods and procedures used to complete the destruction of monitoring wells MW-1, MW-2, and MW-3 are presented below Destruction activities included over-drilling by hollow-stem ' auger and backfilling by concrete slurry Prior to initiation of field activities, a site-specific health and safety plan was developed to outline safety measures to be implemented during field activities A permit for destruction was obtained from the SJCEHD (Attachment 1) ' MONITORING WELL DESTRUCTION ' Destruction of monitoring wells MW-1 through MW-3 was conducted on April 26, 2004 Destruction efforts were initiated by over-drilling to remove the casing, grout, bentonite seal, and sand pack used to construct each well Depth of over-drilling was determined by Shaw personnel ' based on review of well construction logs and measured well depths prior to destruction The wells were over-drilled using 8-inch hollow stern augers to approximately 23 feet bsg Concrete slurry (neat cement) was then tremmied through the auger into the boreholes under the ' supervision of a representative of the SJCEHD The boreholes were capped with concrete at the surface The borehole for well MW-1 was tremmied with neat cement from the bottom of the boring to one foot bsg, capped by b inches of concrete, and filled with clean soil to grade The ' boreholes for wells MW-2 and MW-3 were tremmied with neat cement from the bottom of the boring to two feet bsg, and then filled with concrete to grade Copies of Department of Water Resources (DWR) 188 Reports were forwarded to appropriate regulatory agencies (Attachment ' 2) WASTE DISPOSAL Three drums of soil, two drums of rinse water, and one drum of well debris generated during well destruction activities were temporarily stored on-site in labeled, DOT-approved 55-gallon drums, and were subsequently transported to TPS Technologies in Adelanto, CA for disposal The soil was disposed based on profile data from the September 2003 well installation activities • A copy of the bill of lading for disposal of the drum contents is included in Attachment 3 0 SHARENUSn04-0165 doc