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C -2010 -088 Fruita Loadout <br />Preliminary Adequacy Review (MLT) <br />22 -Nov -2010 <br />Page 2 of 3 <br />Sediment Pond #4, however, is located immediately adjacent to Reed Wash and has been <br />designed with an emergency spillway. Details of Pond #4 are provided on Map 14. The <br />spillway elevation appears to coincide approximately with the existing ground surface. It <br />appears that an embankment is proposed along the outermost edge of the pond (Section I- <br />I'), in order to provide sufficient freeboard above the spillway. It is unclear, from this <br />drawing, what is the intended vertical limit (depth below ground surface) of embankment <br />construction. The fine- grained in -situ soils may be unsuitable material to effectively <br />form the lower reaches of the impounding structure. <br />The Division has determined that a detailed design plan for this structure (Sediment Pond <br />#4) is required, as described in Rule 2.05.3(4)(a)(ii)(A) and (B), to ensure compliance <br />with the safety factor requirements of Rule 4.05.6 and Rule 4.05.9. <br />Rule 2.10 Maps <br />On Map 10, the Permit Boundary is not shown. <br />C. The typical section for Haul Road 41 shown on Map 15 does not portray the proposed <br />surfacing materials and thicknesses as does the Haul Road #2 section. Please revise the <br />graphic to include materials and thicknesses proposed to surface Haul Road #1. <br />7. Map 21 provides two sections (A -A' and B -B') for the rail spur. Please revise Map 21 to <br />include a typical section which shows the types of materials and thicknesses thereof <br />proposed for construction of the rail spur embankment. <br />Map 21 illustrates the profile of the proposed rail spur and loop. The location of the <br />proposed bridge spanning Reed Wash is not shown. Please add this feature to the rail <br />spur profile. <br />Rule 4.03.1 Haul Roads <br />9. Rule 4.03.1(3)(c) requires that the road widths for haul roads shall be appropriate for the <br />anticipated volume of traffic and the nature and speed of vehicles to be used. In the <br />second paragraph of Section 2.05.3(c) and on Map 15, Haul Road #1, which is 0.58 miles <br />in length, is described as having a minimum width of 12 feet. It appears that the road is <br />intended to function as a two -way road, carrying all traffic entering and exiting the <br />Loadout facility, including highway -legal coal haul trucks. The proposed narrow width <br />of Haul Road #1 is insufficient to allow for two -way traffic. Please revise the width to an <br />appropriate dimension which will allow traffic moving in opposing directions to pass <br />safely. The local governing agency, i.e. Mesa County or the City of Fruita, likely has <br />minimum width requirements for two -way roads. <br />10. Page 2.05 -10 describes the proposed methods of haul road construction. What is the type <br />of borrow material to be used to construct embankments? The proposed lift thicknesses <br />