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tirncca Coil C'umpanp flighwall Alining, Addcadum <br />rAtsll.4 Ll). 0$.pQ3UJ ~9anh I5, ?OOJ <br />• 1Veh Pillar Width - tia~c ('reek tican~ <br />Design Mini n Hei ht, ft <br />Dopth of Cover, ft 4 4.5 5 5.5 6 6.5 7 7.5 8 B.5 9 9.5 10.5 <br />SO b~ i- ,y t! ;.! !~ 511 <br />7S ~l: is ;4 J1 :7 !~ ;/: J1 Crr i/ :i SJ •,~ <br /> <br />12$ d4 ill it i' ~: ~J jh ~,1 /ill /:: /~i r. <br />1$U <S irr iy `rf 6f1 AI 6? h7 h•1 A6 /~.1 <br />175 >'t 61 h: ti5 hh b$ 04 ]Q ' ?: '.I 'i <br />200 f."t (~ h4 ) I ?S '$ RII 81 l i $a Sn <br />225 ~fl 77. ',~ 7i tilr $_' $~: SG $% ZZQ vl 9: qr. <br />250 "> ';t SI S•1 Sn 89 'tl v.f uo eN Ilhr IU' hr <br />275 FU S3 5- 4Q 4: 9(~ ~lV thl 1u.1 Iflh IfIS III) ilk <br />300 ~: X~1 ./: 9h !uir Illj fr,h I(W I l.' I I~1 I I' I IV I `.1 <br />325 _ <br />~~ ,+.: ~sl lu` lut+ I IU t Ib I ~, - I'4 ~ ~ I <br />350 ~ ~+~~~ Ii~s i I ~ 111, 1 ~ -- 1 . <br />wv .n.y v.vau. u r ... v Icy, weu N111tl fJ I •~ <br />Pillar widths in Italics have vndth-taheight ratios of less than 0 5 <br />• 0 <br />c <br />S <br />0 <br />~ ~r; <br />z <br />3 <br />a <br />m <br />0 <br />rc '' <br />S <br />0 <br />~a <br />as <br />~a <br />.g <br />J <br />e <br />i <br />I SO 1l)tl 150 2GC :5 .5•?J i~A 4D0 <br />DEPTH OF COVER, N <br />figure ij,t- 11Th pillarJrsign charts titr Sage CYrrk Brant. Srnrca II-\\" Pit <br />blminq <br />He,gn!. <br />f. <br />-~4 <br />45 <br />-~3- 5 <br />-~- 5.5 <br />0 <br />65 <br />7 <br />-i- 7.5 <br />8 <br />-+- 8.5 <br />-9 I <br />9.5 <br />10.5 <br />Ili <br />