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0 <br />Clayton Group Services Page 4 of 4 <br />Standard Operating Procedures <br />SOP -10 - Destruction of Monitoring Wells <br />R 6. Fill the casing, using pressure grouting, with sealing material, generally bentonite <br />slurry. Generally a grout or tremie pipe is used to fill the casing from the bottom up, <br />and the grouting is conducted in one continuous procedure. <br />7. Verify that at least the volume of sealing material placed in the casing equals or <br />exceeds the volume of the casing based on the equations above and the volume of <br />grout that the drillers have placed in the casing. Again, the grout level may drop with <br />time, and additional grout may be required. <br />8. The well surface box and encasing concrete must be removed, and the hole excavated <br />around the well casing to a depth of at least 5 feet below ground surface after sealing <br />material operations have been completed and sealing material has set and cured. The <br />well casing is to be removed to the bottom of the excavation. <br />9. In general, this excavation is then filled with clean native soil or cement to the surface <br />or just below the surface if sod or other plantings are to be placed over the abandoned <br />well. <br />General <br />1. Following abandonment, all equipment must be decontaminated and the abandoned <br />material properly disposed. If contaminated, disposal must be as hazardous waste. <br />2. All field activities need to be fully documented in the field logbook and photographs <br />taken as appropriate. Commonly, it is good policy to photograph well sites after <br />abandonment to document their condition and site appearance at the end of the <br />abandonment. <br />S:Ermr\Proj\SOPs\SOP- l O.doc <br />