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Subsidence Fw)~d Observations <br />West Elk Mme <br />August 2729, 2002 <br />Irregular cracks located in clays of the Wasatch ITOrmation, where the ridge narrows to shout 200 <br />tl wide U~igure G, also sec video ti>r further details). <br />• the cracks trend generally cast-west, arc .ts much as 2.5 inches wide, anJ 30 fi Iong (sec <br />~ idea for morn details). <br />• these cracks arc roughly perpendicular to the trenJ of the ridge. so lateral stresus due to <br />nut~emcnt towards the cast-facing and west-facing cliffs on either side ol'thc ridge arc not <br />likcly. <br />• I hose cmcks, although yuitc wide, arc likcly related to the desiccation pn>ccss <br />Figuro 6. Irntgulsr cracks In clays of the Wasatch Fonnadon. <br />Although thoy are as much as 2.5 Inchon wide, they most <br />Ilkaly aro desiccation crocks. <br />I,cxatin^ f): <br />Clill" exposures on west side of West flatiron mul the cast side of Rox ('anyon showing <br />conditions prior to mining. <br />• Irregular to .jugged, north-trending tension Intctures a.. much as 2 fl wide txcur along•joints in <br />sandstone. ~~1' the Ohio Crock Mcmhcr of the Mesaverdc formation (Figure 7, also uc video <br />fire m~~rr uel;iil~i. <br />tsst-wz s7u wngnt water engineers, Inc. Page 13 <br />December 2002 <br />