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Corey Heaps <br />CAM Colorado LLC <br />June 21, 2011 Page 35 <br />51j. Page 2.05 -9 describes what will be done with unsuitable materials encountered in <br />construction of the Rail Loop. Please use similar language to address the handling of <br />unsuitable materials encountered in construction of the Access Road. <br />Additional Questions regarding the he Light Use Road <br />The Light Use Road appears in cross sections on Map 12 (both fill and cut situations), and <br />in Section A -A- on Map 21 (Rail Loop cut section). The first paragraph on page 2.05 -16 of <br />the application indicates that the light use road runs parallel to the rail loop, is nearly level, <br />and is about 1.5 miles long. <br />51k. In Exhibit 16, the Union Pacific STD DGW 0001B includes Note 4 which states, <br />"Where off -track roadway is to be provided, add 10' -0" additional width to the <br />roadbed section at top of selected material elevation." It is not clear whether this is <br />the proposed method of construction of the Light Use Road, or whether <br />materials will be used. Please describe the materials proposed for construction of the <br />Light Use Road. <br />511. The outer slope on Map 12 is shown as 2 :1, with 2 :1 bermed ditch located downslope. <br />Is a ditch of this configuration feasible to build/maintain on a 2:1 steep slope? The <br />Division suggests that a preferred alternative may be to install silt fence or excelsior <br />erosion logs on or at toe of slope, due to the small disturbed area and flat grades. <br />51m. Please add a Light Use Road typical section to Map 15 or Map 21 showing its <br />configuration in relation to the Rail Loop embankment for both cut and fill sections. <br />Rule 2.05.30) Ponds, Impoundments, and Diversions <br />52. The Division is concerned that groundwater may be exposed during the construction of at <br />least two of the five proposed sediment ponds. Ponds 2 and 4 have bottom elevations <br />that are very close to the groundwater table. For example, using the minimum <br />groundwater elevations (worse case or highest level) reported for Pond 4 in Exhibit 3 and <br />extrapolating these numbers between the wells, the Division estimates the groundwater <br />elevation to be about at 4449.3' at Pond 4. The bottom of the Pond 4 as shown on Map <br />14 is 4450'. This appears to be essentially the same elevation as the water table at this <br />location. Likewise Pond 2 bottom elevation would be within about three feet of the <br />ground water table at the proposed location for the pond. The Division.of Water <br />Resources has raised this same concern (see Item 7 of this letter). If the construction of <br />any sediment ponds exposes groundwater, the pond must be backfilled immediately until <br />a well permit is obtained from the State Engineer. If a well permit is obtained for these <br />ponds another potential concern is that when these ponds are full they would likely <br />discharge through the bottom of the pond directly to groundwater. Unlined pits <br />discharging to groundwater may require authorization from the Colorado Department of <br />Public Health and Environment, Water Quality Control Division and a CDPS discharge <br />