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Figure 4.4.2-1A <br />:; ~'~ .'. <br />.,., <br />Length, L, determine~d'by <br />calculations in text, pages <br />4-66 thru 4-66b. <br />for grouting, I L <br />INCOMBUSTABLE <br />MATERIAL::::: <br />25' MIN. <br />NOTES:-Clean concrete plug contact area to <br />competent rock or coal. <br />-Concrete formed t-iith timber and boards. <br />-Pipes installed around perimeter of plug <br />for contact grouting. <br />SNOWMASS COAL CO. <br />CARBONDAL E, COLORADO <br />R I PERMANENT MINE <br />~,~;°f SEAL <br />WATER TIGHT SEAL <br />SCALE None DRN. Bra <br />CNKD. Br <br />DATE 5/11/87 DRA. NO <br />(ftev. 5-11-37) <br />