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DESERADO MINE <br />BLUE MOUNTAIN ENERGY <br />3607 County Rd. 65 <br />Rangely, CO 81648 <br />(970)675-4300 <br />fax (970)675-4399 O� , <br />February 22, 2018 ; <br />Mr. Brock Bowles <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Minor Revision #173 — Geotechnical Investigations for future Refuse Area. <br />Dear Brock: <br />Enclosed is minor revision (MR -173) to allow geotechnical test coring within the area outlined on Map <br />161. The exact location of the test cores will depend on the results of each prior test core but are <br />projected to be representative of what is shown on Map 161. It is our intention to minimize disturbance <br />to the point that the native site will recover rapidly on their own. No pad construction will be needed. <br />Only limited brush cutting is anticipated. <br />Cores will be about 3.5" in diameter and extend to bedrock. The deepest penetration is expected to be <br />around 60 feet with a conservative maximum average of 30 feet. All core holes will be backfilled with <br />cuttings shortly following completion. <br />Refuse Area and hydrologic designs will be submitted in the near future. <br />The area of interest was recently surveyed for cultural resources. No cultural resources were recorded that <br />could potentially be adversely impacted by this project (GRI Project No. 2012-88, 20 December 2012). <br />The area has a low probability of containing the sensitive species debris milkvetch. My observations <br />indicate that little to no potential habitat exists in this area. Furthermore, the geotechnical investigation is <br />focused on the strengths of the deeper soils in the alluvium and colluvium away from the thin soiled <br />habitat of this species. <br />We hope to mobilize the equipment in early March once approvals are received. <br />If you have any further questions please contact me at 970-675-4322. <br />Thanks. <br />Sincerely, <br />Scott Wanstedt <br />Environmental Engineer <br />swanstedt n,deserado.com <br />enc: <br />cc: Jeff Dubbert <br />Jennifer Maiolo — BLM <br />