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APPENDIX C: DESTROYING SOIL BORINGS <br />Soil borings that are not completed as monitoring wells will be destroyed by filling the <br />holes with a neat cement grout, cement/sand grout, or cement/bentonite grout. A <br />high-solids bentonite grout may be used if appropriate. Geomatrix field staff will <br />calculate the borehole volume and compare it to the volume of grout used to <br />evaluate whether bridging has occurred. These calculations and the actual volume <br />emplaced will be noted on the BORING LOG. The grout will be placed in continuous <br />lifts from the bottom of the boring to a depth of 20 feet above the water table. The <br />grout will be emplaced by pumping it through the hollow stem augers, drillpipe, <br />tremie pipe, or flexible hose initially lowered to the bottom of the borings and raised <br />incrementally as placement proceeds. If hollow stem augers are used, the augers <br />should be raised incrementally as grout emplacement proceeds. Augers will not be <br />raised in increments greater than 20 feet or greater than allowed by borehole <br />stability. Borings that are terminated above the water table and not greater than 20 <br />feet deep may be destroyed by continuous lifts originating at the ground surface. The <br />grout will be pumped or poured until a return of fresh grout is visible at the surface. <br />Additional grout may need to be added to the soil boring if significant settlement has <br />occurred after the grout has set. <br />1: \Project \ 14000s\ 14527 Westway Stoekton\3000 Reports\ WorkPlan \Appendix_c.doc