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I <br />N <br />O <br />w <br />1 <br />w <br />O <br />0 <br />3H <br />(MINIMUM) <br />mmmmmm <br />ommmmmm <br />ommmmmmmmm <br />0 <br />FIGURE 5 <br />SEAL OF SOLID CONCRETE BLOCK 8- THICK, FULLY <br />GROUTED, KEYED INTO RIBS & ROOF 8", <br />CONSTRUCTED ON A CONCRETE FLOOR SILL. <br />EARTH FILL <br />4' COVER OVER PORTAL <br />H <br />0 <br />SEAL PLACED <br />WHERE THE <br />OVERBURDEN <br />3H IS AT LEAST <br />3H DEEP. <br />" I 'N l . <br />FLOOR <br />