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2006 Subsidence and Geoloyk Fle-IU Obsonrations <br />Bar ^,anyon. Wesl Flatiron, Apache Rocks. and Soulh of Dwldn R7ining Areas <br />4.0 TRAVERSES AND OBSERVATIONS IN THE BOX CANYON, WEST <br />FLATIRON, APACHE ROCKS AND SOUTH OF DIVIDE MINING AREAS <br />))l`IaIICd dbCll>alr ~Il Ut uh>Cr1 ,IIUn15 .I~SUCLII C,i uIIII Ir::1~1'>e~ .~-:~ llll'nll,~h ~-V ,II'e prlllldl'd <br />helaa lsec Flap I-. <br />4.1 Traverse A-A' <br />II'^1 cr~i ~~-.~ tq•tilll~ .tI II1C lrrrn 111 drill f, `:Itl± .Il1r ~\i the >l`:1+.11 L'.Ili r,+n\I inlrlc~ rrl 1~q1~~\4,111 <br />panel ?4 and ends at the ~lclhanc Uralnage L1'ells (MDT>- Il)•01. Il)-OZ. and I'~-0? abuee the <br />nortltcast area of the nun~xl pan of lunglrall panel Ill. <br />I he trl~'crsc continui~ northward abole mined longaall panels n_4 to _'?. un-mined panel. ? 1 and <br />'Q, and the mined part of panel Il). (A'crhurilcn depth to the I3-tieam lurks tram '_, I;t) to'_?SIJ <br />Icet. <br />tioil and cullu~ium as much as I11 fret thick, dcri4~xl kern clay:: wall alts of the ~\usatch <br />Formation and the underlvurc Uhia ('reek 4lcnrbcr of the \tcsalerdc Fomlutiun. acre <br />encuuntercd on Qre road. \a subsidence features acre ohscncd slang the road. Possible <br />subsidence-relutcd cracks urn• „hsrn ed north of tltc methane drainaltr a rll. I I o~,drnl 1 ( <br />4.1.1 location 1 <br />('rack arc luc:rtcd shale the norlbc;u0.'rn rd~;e,d nunc,l Inne•a.dl panel Ir), on Ihr nurth~•rn crlc <br />of ~In1'1's 19.111, I9-112. ;urd I l)•(U, in graded material. These track. arc therefore luutted 14~uhm <br />the area ofmaximum tensile strains (Figure ~). <br />The u4erhurdcn depth to the E3-tieam is shout 3?q 1'crt. 'i~he drill site i. conitructal primarily in <br />sail an<I colluvium dcri4•~x1 from the Wasatch Furtnatiun. <br />llic crack. arc either relate) to diflercntial settlcnrcnt of the graded material and or al <br />subsidence. It is cstitnutcd that the probability nt' the crteks being settlement related versus <br />subsidrncr related is about ill 51). <br />831-032.750 Wnght Water Engineers. Inc. Page 9 <br />Docc,mbnr 2006 <br />