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Fall 2007 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />~.J <br />Y ~ <br />~ •,~ ' <br />~ <br />y ~ J <br />1~IL~ r `rt <br />,. ~ <br />-Yqr - <br />~~~ ~ <br />~. ,' , .. <br />,.~ ~ ' ~ V~ ` <br /> <br /> <br /> <br />~ ~ 4,. <br /> <br />a - <br />' <br />~-' ' <br />~ <br />• <br />' <br />. <br />_ ,}+ <br />T may <br />~ <br />~ <br /> <br />, <br />~ <br />~ ' <br />~ K• <br />- _ tic r;..~~` <br />~ ~P'4M r i +~-. - ~ j/ W <br />!~ ~ ~~ P='a y .I <br />Figure 9. Close up view of crack number 2 zone <br />(shown in Figure 8) showing how it intersects MDWs <br />21-32, 21-36, and 21-38. Note that crack is offset <br />downward to the left (west). <br />Figure 8. Irregular crack or crack number 2 <br />mne, located about 50 feet east of crack number <br />1, ~s as much as 10 inches wide and an <br />estimated 200 feet long. Crack begins in soil and <br />colluvium south of the drainage wells <br />(foreground) and goes northward into about the <br />middle of the three drainage wells (background, <br />see Figure 9). This crack and local crack zone <br />were not observed by MCC personnel one week <br />prior to this date (September 26, 2007). <br />3) -1'hc~ c~•c~rrulcrte er•crek number 3 _nnc~ is trp ro ? i~rellc~s hide and 75,foc~t long and loecrte~d <br />crhuut ~O fc~c~t cast of crack nrunber ? _onc~. This crack is Ic~catcd un the eastern side oi~ the <br />methane drainage wells (Figure 10). <br />• <br />831-032.780 <br />November 2007 <br />Wright Water Engineers, Inc. <br />Page 22 <br />