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2. I observed the recently constructed diversion ditch and the slope upgrade of that <br />ditch for any adverse stability conditions. The ditch is located downslope from the <br />historic King Mine buildings on the Bowie property. Historic rock retaining walls for <br />slope protection of the former rail lines appear to be in good condition and <br />performing well with no failures noted during our visit. The ditch appears to be <br />graded to allow water flow downslope to established drainages and the slope <br />above the ditch is beginning to achieve its natural angle of repose. The ditch <br />appears to have performed well during the recent monsoonal storms. The ditch <br />should be inspected and cleaned periodically as the slope naturally vegetates itself <br />to match existing conditions above. Any significant slope failures or changes in <br />conditions should be brought to our attention for possible mitigations <br />recommendations. <br />3. Reclamation of compacted gob slopes has begun and appears to be progressing <br />well. We reviewed a test area for re- seeding that appears to active and in good <br />condition. We noted several areas of natural vegetation taking root directly on the <br />un- reclaimed, compacted gob due to the recent precipitation. This bodes well for <br />future reclamation efforts. Photo 2 shows progress on cover soil placement. <br />4. In general, the grading and compaction of CWDA No. 2 appears to be progressing <br />well and significant work has been done since our last site visit in June 2013, as <br />indicated by our weekly compaction testing and observation reports. <br />Closing <br />On -going monitoring of inclinometers and piezometers at CWDA No. 2 provides an <br />indication of the stability of the refuse as well as an indication of probable performance <br />for other refuse piles at Bowie. For these reasons, we recommend continued monitoring <br />of this instrumentation on a quarterly basis. We sincerely appreciate the opportunity to <br />work with you on this project. If you have any questions regarding this letter or the <br />instrumentation monitoring at CWDA No. 2, please don't hesitate to contact me at (970) <br />497 -8852 or dan@buckhorngeo.com. <br />Sincerely, <br />BUCKHORN GE-OTE /CH, INC. <br />i7 ,/ r`y` `� <br />Daniel C. Quigley, P.E: <br />{;� <br />3 _ <br />.° `yam <br />Gxlk <br />U- <br />Enclosures: Instrumentation Site Plan, Inclinometer <br />Cumulative Displacements, Summary of <br />Pore Pressure Monitoring <br />cc: Jim Stover, J.E. Stover and Associates — ELECTRONICALLY ONLY <br />3rd Qtr Monitoring Report.doc PN #05- 126 -GEO <br />Page 3 of 5 <br />