2010-11-22_APPLICATION CORRESPONDENCE - C2010088 (2)

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C- 2010 -088 Fruita Loadout Preliminary Adequacy Review (MLT) 22- Nov -2010 Page 2 of 3 Fifth ¶ • In the next -to -last sentence, please correct the spelling of Entrado — it should read, "Entrada ". Rule 2.05.30) Mine Facilities 2. Section 2.05.3(3)(a) and (c) discuss the proposed mine facilities. For each facility listed, please identify the map or maps on which the facility is depicted. Rail Loop and Bridge 3. The plan and profile of the proposed rail loop is provided on Map 21; there is very little other information presented within the application. Based on communication with Ms. Stover - Bishop, Union Pacific railroad has its own detailed requirements governing the construction of embankments. Please provide a summary of those requirements for inclusion within the permit text. Otherwise, the Division will need to require that the embankments be constructed in accordance with the Rules for roads and embankments. Rule 2.05.3(3)(c)(i) requires that specifications for each bridge be provided. On page 2.05 -9, the bridge is described as being 9' in width and 60' in length, constructed of steel girders with concrete abutments. The second paragraph states that geotechnical work on the foundation will be performed prior to construction of the bridge. Please provide general details and a plan sheet of the proposed bridge for inclusion in the permit application. Rule 2.05.3(4) Ponds and Impoundments 4. Sediment Ponds #1, #2, #3, and #5 appear to be incised, based on the details shown on Maps 13 and 14. No embankments are proposed to be constructed for these four ponds, and dewatering will occur as needed by pumping to Reed Wash. Sediment Pond 44, however, is located immediately adjacent to Reed Wash and has been designed with an emergency spillway. Details of Pond #4 are provided on Map 14. The spillway elevation appears to coincide approximately with the existing ground surface. It appears that an embankment is proposed along the outermost edge of the pond (Section I- F), in order to provide sufficient freeboard above the spillway. It is unclear, from this drawing, what is the intended vertical limit (depth below ground surface) of embankment construction. The fine- grained in -situ soils may be unsuitable material to effectively form the lower reaches of the impounding structure. The Division has determined that a detailed design plan for this structure (Sediment Pond #4) is required, as described in Rule 2.05.3(4)(a)(ii)(A) and (B), to ensure compliance with the safety factor requirements of Rule 4.05.6 and Rule 4.059. Rule 2.10 Maps 5. On Map 10, the Permit Boundary is not shown. Please add the Permit Boundary.