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Fall 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br /> <br />ctr l s <br />.r • ' <br />• v" ' tiff r.l?..? .1 <br />ti <br />L v <br />vY <br />1 <br />Figure 46 ail 20u8 northward view of several parallel subsidence cracks that have been partially <br />filled by settlement and vehicle traffic- <br />The loni,,e.st observed crack extended completely across the read (approxiniately 20 feet) that <br />?cidened to 6 inches (with a 2=4 inch depth) at the outside edge of' the road\\ay till. This same <br />crack had a 4-6 inch vertical displacement at one location in the roadwav (Fiuure 47). <br />It should be noted that these cracks were only observed in the fill material comprising the <br />roadway \\ hick is on the west side, and topot7raphically above. the valley floor. These cracks <br />were observed in the cut slope or down slope into the valley floor. <br />• <br />831-032.790 Wright Water Engineers, Inc. Page 60 <br />December 2008