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07-31-2003 04~37RM FROM FERRN ENGINEERING SERVICE TO 2475104 P.02 <br />~ i ~ <br />~, ~ RECEIVED -~ <. L i <br />_fi ~.i <br />yOHN F, ABEL; JR. UG ~~ ~ ~ 310 LbOKOVT Vl covlar ' <br />.' MININ4'!ENOtNEER ~ ~ ~~~{~~ GOL.OE~I CO ~ ~ 1 i !' <br />i ' Oi ision of Minerals and Geology ,_rI,~r~/ ! ~'3 ~ - 1 <br />' ~ Y~~ ~ ~ FA71C 278a j <br />, ~ ~~ ik <br />py,,,_~ ~ ~ 1 I i~ <br />~~~° Gep~ July 23,1I20g3 'i <br />/ a9Y ~ I <br />~;Kr. Steve Fea~1((ri / ~. ~' ~' <br />'Silver wing Cd. S~nnytl In,t <br />P.O. `Box 299 ~ M-1977-.~3'7~ ~T~v <br />'$iiverton, CO'81933 C'onseot ~ tree. ,~ <br />Rented la'1'rori P.^o~ fc , <br />~' <br />~~Refeileri~e: Bi}tkhead des~igfi, Mogul ,bline,mddificatioris' I~ ~ ~1 ~~~ <br />i I ~ i,, . <br />Dear~~teve:: ii ~~ <br />i ~~ i I <br />! The folldwinq two modifications to the drawings for tl i~ <br />~kogul'~Mine, NO. 1 Level {julkhead are approved and r~comrhend d <br />' iThe 3-indiameter schedule 40 pipe braces for the form dan i <br />he safely replaced with 2-in diameter schedule 40 pipe brad~sa <br />~Desi$r1 Goad f r ahe .assumed maXimum 10-ft 'long 3=1n.;diamete~ ; <br />'schedule, 40 p~pe'brace,..'fixed with respect to rotation and;;: ~i <br />translation, Ls .approximately 37 kips, for .a 32.0 kp.compq erit. <br />perp~radicular to the bulkhead' face. The §tiorter ma:iimu:µ 5~ t ~ ~ ~. <br />iengt>x<of the rotation and translation fixed 2=in drame$er Il <br />ItSChedule 40. p pe braces have a.streilgth of approximately 34 ki~'ps, <br />for a 29.4 ki component perpendicular to the bulkhead dace The II <br />;. , ~. <br />~ I <br />t.: : <br />, <br />~aleulated fl id concrete form load on the two upper; level <br />tent~81 pipe races is 5.35 kips and on the two lower level <br />~entr3l' pipe races is 6,04 kips. The factors of safet~!, 5; 5 ;and <br />9.9 respectiv~'ly, are acceptable and are designed to permit the' <br />eoncrete:wi h'in the bulkhead to be pressurized at the end a~ farm <br />filli~x~q <br />Cr <br />~xhe: 85,0 Fsi design ~tength No.. 1 Structural g~aae ~D~o ,la~s~~ <br />~agg~.ng c~n be~safely:reduced from 3 by 12-in td 2 by ~ i~ <br />aad' carry~inq ca acid of the three 2-ft 6-in long simp~>~y <br />P Y <br />=tad lag ing boards placed in the access opening at th' tiap <br />;e air si a bulkhead form is 665 lb/ft? for the ~ by,12 n; <br />ng and 1847 lb/ft' for the 3 by 12-in lagging. Thelflu di <br />e'te. load n the lower access opening board will; be X325', i <br />z; 225.1b~ft' for the central access opening board and' 5~ <br />i2,fdr the upper board. The design load carrying Capaci y'of <br />s>th~otas 2. b~ 12 ;in"7ag~ging is 998 lb/ft=: :The maXimum ,f3 id <br />alts j.load i§ 975' lb/ftz applied to`the lowest unrestiaiiaed ' <br />nuous 1aq~gi;ng board,' 6.5-£t below the back, Thee design load <br />i- i i .. <br /> <br /> <br />! I <br />1 i i <br /> <br /> <br />i .~.. <br />,; <br /> <br />,, <br /> <br />;~ <br />~. ~ ~ <br />1 ,~ <br />:~ <br />