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10 <br /> k4 KLEINFELDER <br /> 4.2 Monitorins? Well MW-3 Abandonment <br /> In order to accommodate the future development of the site Kleinfelder proposes to abandon <br /> Monitoring Well MW-3 and install a new monitoring well (MW-3r) in like hydrogeological <br /> conditions. That location is shown on the attached draft Plate 2. The methodology for the <br /> installation of MW-3r is as follows. <br /> During the course of abandonment, MW-3 will be mechanically perforated and grouted with a <br /> neat cement or sand-cement slurry (mortar). The grout will be tremmied into the former well to <br /> ensure filling. The five feet of casing below the ground surface will be cut off and excavated. <br /> The upper five feet will then be backfilled with on-site soil and tire-rolled with the backhoe or <br /> other heavy equipment. <br /> 4.3 Monitorine Well MW-3r Installation and Sample Collection <br /> A total of one (1) monitoring well will be installed at the project site at the location shown on <br /> Plate 2. This well is on property that is currently not in escrow. The new monitoring well (MW- <br /> 3r) will be the relocation of the existing monitoring well MW-3. For purposes of the attached <br /> cost estimate, the well will be installed to a total maximum depth of approximately 60 feet below <br /> ground surface (bgs). Approximate first groundwater is currently estimated to be at a depth <br /> ranging from 20 feet below the ground surface (bgs). The monitoring well will be installed using <br /> a truck-mounted drill rig equipped with 8-inch hollow stem augers. During the advancement of <br /> the borings, soil samples will be continuously obtained for lithologic classification, but will not <br /> be chemically analyzed. The boring will be drilled, logged, and sampled following the Typical <br /> Kleinfelder Field Protocol described in Appendix A. A two-inch diameter well will be <br /> constructed in the boring. The well will use a 20 foot screened section. <br /> Because of the lack of known contamination in this area of the project, some soil cuttings <br /> generated during the drilling will be placed on the ground surface. Water generated during steam <br /> cleaning of auger and/or equipment, and development/sampling of the wells will not be <br /> contained. <br /> 4.4 Well Development and Survevine <br /> Twenty-four to 48 hours after installation, the monitoring well will be developed to remove <br /> sediment-laden water and to increase the effective radius of the wells. Development will be <br /> performed as described in Appendix A, Sections A-3.2 through A-3.3. <br /> Once the well is installed, the top of the well will be surveyed by MCR of Manteca, California <br /> (contracted independently by Atherton Kirk Development Company) so that depth-to- <br /> groundwater measurements in the well can be converted to groundwater elevation used to assess <br /> 20-YP9-329/2000P044/2000WOOS Page 7 of 12 <br /> Copyright 2000,Kleinfelder,Inc. February 8,2000 <br />