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<br /> <br />3H <br />(M/NMUMJ <br />SEAL OF REINFORCED CONCRETE AT LEAST <br />~ ~ l2 ~~ THICK AND KEYED l2 ~~ /NTO COAL <br />OR TO ROCK CONTACT <br />REINFORCED MAT - %p /NCH REBAR <br />l2 /NCH O.C. EACH D/RECT/ON <br />4 fl. COVER - <br />OVER PORTAL <br />EARTH F/LL <br />-4 ~~P/PE FORD <br />POSS/BL E <br />wA rER <br />DRAINAGE <br />_~~~` 1 <br />I <br />3H <br />//i SEAL PLACED - ~ - - <br />WHERE OVERBURDEN <br />/S AT LEAST 3H I <br />o '~ <br />L1 ~ /'/-_ <br />,: o ~ ~~O oo Jo~ °. ~ ~ c,, <br />,~ ,~ .. _ <br />' V <br />~ L ~. ~ .o <br />~ ~ ~ o o ~ 1 <br />o <br /> <br />PORTAL -PROF/LE <br />GENERAL SPEC/F/CAT/ONS FOR <br />PERMANENT CLOSURE OF PORTAL ENTR/ES <br />F/CURE 3 <br />i <br />H <br />i <br />PORTAL -CROSS SECT/ON <br />