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fi * <br />MAP NO. 30 <br />ih;s drawing' was lone *PORTAL ENTRY WATER TIGHT SEALS <br />drawing e;tuetond correct to the <br />ysljA and belief. <br />�a <br />rs E. stoveAr'*1- o e <br />P. £. <br />3H /(MINIMUM) <br />SEAL OF SOLID CONCRETE 3' THICK <br />3000 psi MINIMUM <br />EARTH FILL <br />4' COVER OVER PORTAL <br />G <br />1 as <br />H <br />as e d <br />//XX/YA <br />ELEVATION <br />/ 25' MIN. <br />a a <br />H <br />qo <br />SECTION <br />SEAL PLACED <br />WHERE THE <br />OVERBURDEN <br />3H IS AT LEAST <br />3H DEEP. <br />GENERAL SPECIFICATIONS <br />FOR <br />PERMANENT WATER TIGHT CLOSURE OF PORTAL ENTRIES <br />FLOOR <br />111111 IIIII IIIII IIII IIIII IIIII ICI IIII <br />004748 <br />