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MAP NO. 28 <br />drawing was done PORTAL ENTRY SEALS <br />O {� �c�rtli:•/ <br />r un e Orrt supervision and <br />all of the I a n presented on <br />drq tr eO,q, correct to the <br />��tttes o leg= oqd belief.Q <br />♦ 7 <br />-` SEAL OF SOLID CONCRETE BLOCK 8" THICK, FULLY <br />GROUTED, KEYED INTO RIBS & ROOF 6 <br />CONSTRUCTED ON A CONCRETE FLOOR SILL. <br />ELEVATION <br />EARTH FILL <br />4' COVER OVER PORTAL <br />' MIN. <br />d <br />° a <br />v ° Q <br />d ° c <br />SECTION <br />• %'�- GENERAL SPECIFICATIONS <br />FOR <br />PERMANENT CLOSURE OF PORTAL ENTRIES <br />H <br />SEAL PLACED <br />WHERE THE <br />OVERBURDEN <br />3H IS AT LEAST <br />3H DEEP. <br />FLOOR <br />iiiiii hill hill iiE llil lilli lilt ilI <br />004750 <br />I i <br />