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SEAL OF REINFORCED COWCRETE AT LEAST <br /> B INCHES THICK AND KEYED /2 INCHES INTO " <br /> COAL OR TO ROCK CONTACT. <br /> REINFORCED MAT-//2-IN. REBAR <br /> /2 IN. O.C. EACH DIRECTION <br /> 3H <br /> (M/MMUM) <br /> 4-FT. COVER OVER PORTAL SEAL PLACED <br /> WHERE THE 3H <br /> •Ln OVERBURDEN /S <br /> EARTH FILL AT LEAST 31y <br /> - -- - --- -. . o •0 <br /> I i , I 3HdP <br /> ELEVAT/ON <br /> SECT/ON <br /> TYP/CAL mINE OPEN/NG SEAL <br /> FIGURE 7 <br />