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~~ <br />~- <br />~' <br />ra <br />SEAL OF REINFORCEU CONCRETE AT LEAST <br />B /NC/IES THICK AND AEYEO /2 /ABC/lE'S /NTO <br />COAL OR TO ROCK CONTACT <br />RE/NfORCEO AIAT - !/2 -JN. REBAR <br />/2 /N. O.C. EACy D/RECT/ON <br />3// <br />(Al/N/AIUM~ <br />9-FT. COVER OVER PORTAL <br />EARTH f/\ <br /> <br />SEAL PLACED <br />INHERE T//E <br />OVERD[/RDEN /S <br />AT LEAST 3// <br />O ~ 0 3H- <br />•. <br />c, ., ... . <br />~~ ~ ~ O o'. . •. p . <br />SE CT.rU,;~ <br />.__... TYPICAL. A//NE_OPENING SEAL <br />~iaru: q <br />z.ns-zn <br /> <br />r-1 <br />3H <br />C'~ <br />ELEVATION <br />