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l/l�\�111���/I1���/ll►�1/1�►►1 /ll� <br />I'//AN//11l//41 I► <br />SEAL OF REINFORCED CONCRETE AT Lf -AST <br />B INCHES THICK AND KEYED /2 INCHES INTO <br />COAL OR TO ROCK CONTACT. <br />REINFORCED AIAT - I/2 -IN. RESAR <br />/ /2 IN. O.C. EACH DIRECTION <br />3H <br />MlINImum) <br />ar <br />4 -FT. COVER OVER PORTAL <br />EARTH FILL <br />-r - - --t--1 <br />',%/�t��/r'�1_-'-- --------"�,'/�'►"/iii►r�..� <br />EL E VA TI ON <br />XSEAL PL ACED <br />{t'HE•RE THE <br />OVERBURDEN IS <br />AT LEAST 3H <br />p � o 0 3H <br />o o 0 <br />fl O 'GD <br />SECT./0,°,r <br />Trp/CAL Al/NE_OPEN/NG -SEAL <br />FIGUIRE 4 <br />3H <br />