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SEAL OF REINFORCED CONCRETE AT LEAST <br />/2 /NCNES THICK AND KEYED /2 /NCNES INTO <br />COAL O'R TO ROCK CONTACT. <br />REINFORCED MAT - //2 - /N. REBAR <br />/2 /N. O.C. EACH D/RECT/ON <br />SEAL PLACED <br />WHERE THE <br />T, COVER OVER PORTAL OVERBURDEN /S <br />AT LEAST 3N <br />RTN F/LL <br />3H <br />~~o,',O.• H ~ '~ <br />.o• o•' .• :O. <br />. ~ c Q ' p' <br />0 <br />O 0-O.'o.0 O:o:a u N <br />i •. p .O. ~ ...• .Q. O. . 0 .. O e. <br />.. <br />SECT/ON <br />GENERAL SPEC/F/CAT/ONS <br />FOR <br />PERMANENT CLOSURE OF PORTAL ENTR/ES <br />FIGURE 3 <br />EL EVAT/ON <br />