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Fall 2010 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• 3.0 TRAVERSES AND OBSERVATIONS IN THE BOX CANYON, APACHE <br />ROCKS, AND SOD MINING AREAS <br />A detailed discussion of observations associated with traverses A-A' through O-O' is provided in <br />this section (Maps 1 and 2). Many of the photographs taken during the October 2010 field visit <br />are included as figures in the text of this report. Where these images have notable differences <br />from comparable photographs taken in previous years, some of the older images are also <br />included for comparison purposes. <br />To reduce the overall size of this document, narrative text and photographs for traverses where <br />no noticeable change was observed are excluded. Photographs were obtained from each of the <br />photographic observation points (with the exception of Photographic Observation Points 6, 8 and <br />9 as discussed later in this section) and compared to the previous year for changes. If no changes <br />were noted, the photographic observation point images were archived and excluded from this <br />report. <br />• <br />3.1 Traverse A-A' Through H-H' <br />Traverses A-A' through H-H' were each visited during October 2010. It should noted, however, <br />that Traverse A-A' was cut short due to ongoing construction of a new coal refuse area which had <br />made the road impassable above a certain location. As a result, WWE was unable to visit the <br />Photographic Observation Points 8 and 8A to obtain comparative photographs of the landslides <br />on the western edge of West Flatiron. <br />Observation notes and photographic documentation were recorded along the subject traverses as <br />appropriate. However, no noticeable changes were observed between the spring and fall 2010 <br />field visits (both as observed in the field and in comparison of photographs taken from each field <br />visit). As such, specific details associated with these traverses (i.e., topographic description, <br />overburden depth, exposed surficial materials, etc.) are not included in this report but can be <br />found in older versions of this semi-annual report (the most recent being the Fall 2009 <br />• Subsidence and Geologic Field Observations report). <br />831-032.792 Wright Water Engineers, Inc. Page 5 <br />April 2011