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M1 q <br /> surface of each boring will be finished to match the surrounding sidewalk surface. A <br /> registered geologist or registered civil engineer will supervise or direct the well removal <br /> and abandonment. <br /> Pressure Grouting and Abandonment Procedures (MW-4) <br /> Orion will obtain a well destruction permit from the San Joaquin County Environmental <br /> Health Division. <br /> Pressure grouting will be performed by attaching a pressure-tight fitting to the well head <br /> and using a pump to pressure-fill the well casing and annular space with a bentonite slurry <br /> mix. Based on casing and borehole dimensions, a prescribed volume of bentonite slurry <br /> will be pumped through the casing to;'a height of 5 feet below ground surface. Once this <br /> height is attained, the upper 5 feet of casing and well materials will be removed and <br /> disposed of properly. Upon removal, an approximately 5-foot-thick layer of concrete will <br /> be placed above the bentonite slurry as'a final capping material.' The surface of the boring <br /> will then be finished to match the surrounding building surface. A registered geologist or <br /> registered civil engineer will supervise or direct the well removal and abandonment. <br /> I <br /> Field QA/QC Procedures <br /> Procedures are described below for decontaminating field equipment, managing wastes <br /> r generated, and documenting the field program. <br /> j a <br /> Equipment Decontamination Procedui es <br /> Equipment will be decontaminated between events using the following procedures: <br /> 1 . Rinse with water using a Ibrush to remove soil and mud. <br /> 4 <br /> 2. Wash with non-phosphate detergent and water using a brush. <br /> 3. Rinse with deionized water. <br /> 4. Rinse again with deionized water. <br /> (S:\BFS\Stockton\WKP\WKP004.docI 11/13/01 <br />