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groundwater cutoff, the slurry wall should, at a minimum, contact the massive claystone and <br />sandstone. If possible, penetration into the massive bedrock should be achieved to minimize the <br />creation of windows under the slurry wall. <br />Based upon the density, strength and massive nature of the bedrock, it is unlikely that more than <br />a few to several inches of penetration can be accomplished with a hydraulic excavator. <br />Hydraulic excavators are commonly used for slurry wall construction and is the method that has <br />been selected by Loveland Ready Mix for this project. Typically, however, slurry walls aze <br />"keyed" three to four feet into an impermeable layer. The purpose of the key is to help <br />minimize the potential for windows beneath the wall that could develop from sand <br />accumulation in the bottom of the slurry trench and from variations in the chazacteristics and <br />elevation of the impermeable layer. Because a 3 to 4 foot key is not possible with the selected <br />construction method, the Contractor will be required to take special care to minimize the <br />potential for sand accumulation utilizing standard trench bottom cleaning methods prior to <br />introduction of soil-bentonite backfill in the trench. This should help to reduce the risk of <br />unacceptable seepage beneath the slurry wall. <br />G:\PROIELTS\10]0? I-000 Loveland Ready Mu Shirty Wall\R. Re<orda and CortapovdenceR.l l Repona\Fivei Shirty Wall Dnigv Repon.doc <br />