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2005 Subsrtlence and Geologic Frold Observations <br />Box Canyon, West Flatiron, Apache Rocks, <br />aril South of Drwde Mining Areas <br />Rgure 13. Northwest view of a rocktall located north <br />of the road to West Flatiron. This image is entargea to <br />show the joint and fracture located to tho felt and nyht <br />of the rock mass (respectivotY) perched above the <br />cavny produced by the tall that occurretl on June 30 <br />2004. The perched rock mass above tho cawty ~s <br />Ilkery to become detached in response to gravely, and <br />the effects of Seasonal Ireezing and thawing <br />A slab, ur slabs, ul rtxk ranging (rum ? to S feet thick (averaging about 4 feet), ?S to 45 fact <br />wu1c. and iU l0 7(1 Icet high detached along a nonhcast•tronding dint and nru ur mare ruuehly <br />pctTxndicular joint.. 1'hc slabs broke up in the fall and Ibnncd a rubble U;dusl pile that bltx;ked <br />the ruaJ to \Yest Flatiron. <br />The Itxk mass perched above the detached rune is expected to eventually become detached along <br />a joint and I'ructure (Figure lit, and (all in response to gravity and the efticts of (rearing and <br />thawing in the joint and fracture. "ihe joint and fracture tin the western and eastcm side of the <br />pcrrhed ruck appear rnure pronounced than they did last year. This fall would pose a hazard to <br />any people or vehicles tin tltc road heluva~, should a vehicle tx traveling heauw at the time of the <br />fall. <br />831-032.710 W nght Water Engineers, Inc. Page 28 <br />November 2005 <br />