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<br /> <br /> <br /> <br />FIGURE 5 <br />N <br />O <br />1 <br />w <br />O <br />SEAL OF SOLID CONCRETE BLOCK 8" THICK, FULLY <br />GROUTED, KEYED INTO RIBS & ROOF B", <br />CONSTRUCTED ON A CONCRETE FLOOR SILL. <br />3H <br />(MINIMUM) <br />4' COVER OVER PORTAL <br />EARTH FILL <br />.~•d' ~ . <br />H .d •• .o ~ .• a. ,• •a.. <br />ELEVATION SECTION <br />GENERAL SPECIFICATIONS <br />FOR <br />PERMANENT CLOSURE OF PORTAL ENTRIES <br />~i <br /> <br />SEAL PLACED <br />WHERE THE <br />OVERBURDEN <br />3H IS AT LEAST <br />~ 3H DEEP. <br />H <br />.i ~i~i. <br />FLOOR <br />