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Figure 4.4.2-1A <br />Length, L, determineW by <br />calculations in text, pages <br />4-66 thru 4-66b. <br />for grouting, I L <br />INCOMBUSTABLE <br />M A T E R I AL <br />25' MIN. <br />NOTES: -Clean concrete plug contact area to <br />competent rock or coal. <br />-Concrete formed with timber and boards. <br />-Pipes installed around perimeter of plug <br />for contact grouting. <br />SNOWMASS COAL CO. <br />CARBONDALE, COLORADO <br />R I PERMANENT MINE <br />SEAL <br />WATER TIGHT SEAL <br />SCALE None ORN. BY <br />HKO. BY <br />DATE: 5/11/87 ORA NO <br />(ftev. 5-11-37) <br />