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EKhib~t 60C <br />Subsidence Evaluauen and 2004 Geologic Hazard Field Observations <br />West Flatiron Lease Araa <br />• I he 11'cst flatiron Lease area is characterized by rugged topography throughout. On this <br />••• north tilde. n+o brush-coaercd and trec•ancred ridges generally twrdcr a central trcc•co~ercd <br />._ dra++, wish siJc slopes ofcolluvium and soil. <br />Occrburden depth to the 13 Scam in the 11'cst Flatiron Lease area ranges fmm about 500 feet <br />near the mouth of Raven Gulch in the northeast part ul'the lease to about 2.200 feet on the <br />east edge of 14'est hlaliron near the Nest-central boundan ofthe lease. <br />• Ko fresh-looking landslides +acre obsen~ed on the north side of the Icase. The landslide to <br />the riLht of Figure K is located in the nonheastcm part ~~f the Roy Cam on mining area. <br />8.5 location 5 <br />Lueutirn 5 is ah~nit I,>i1t1 Icet abocc. and nurch t~l', thr \urch Fork un :t ri~uJ to one of the <br />methane Drainage wells for Btc osbo+r mine. It proviJcs a good +icw of the norchern pun of the <br />11'wt Flatiron Lease nrea (Figure `)1• <br />.~ <br />,~~vw `r ~~ i ~ .,y~~~~''~ r %~7 ill- . <br />.{` ~ •" <br />,~ ~ + , ~ <br />~s • ,. <br />Figure 9. Southward view of the northern part of the West Flatiron Lease area from Locatwn 5 The left <br />margin of the image ~s the approximate eastern boundary of ;he lease: the nght margin ~s the edge totaled <br />in the right middle ground at Left (east) edge of West Flatiron (the flat top located in the right m~tldle ground <br />of the image). Mount Gunnison is located ~n the right background. <br />- • <br />831.032.650 Wnght Water Eng~neero. Inc Page 25 <br />No+rember 2rA4 <br />