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with water from the Walker Ditch. Soil data (see Tab 9) indicates the soil is an <br />Apmay Manbow Complex, which is formed in alluvium of mixed sources. <br />In conclusion, the Loadout will not affect any existing or potential flood- or <br />subirrigated lands nor will the Loadout significantly affect the essential <br />elements o£ the hydrologic functions of the AVF. <br />• There is only a small area of alluvium within the Loadout permit boundary. <br /> Most of the permit area is on gently sloping hillsides and upland benches <br /> above the alluvial deposits. <br />• The grass hay field in the SW1/4 of Section 10 is primarily flood <br /> irrigated with Walker Ditch water, which is diverted from the Yampa River <br /> several miles upstream of the permit area. <br />• The grass hay fields in the El/2 of Section 10 are flood irrigated with <br /> Walker Ditch water. Water flow in the Walker Ditch and associated feeder <br /> ditches have bean protected using a series of culverts under the rail spur <br /> (see Exhibit 12-1). <br />• The existing ground and surface water quality (see Tab 7, Hydrologic <br /> Description) is marginal for agricultural use. As discussed in Appendix <br /> 7-2, regional alluvial groundwater quality appears to be of "limited use <br /> and quality." The TDS concentrations in the Dry Creek alluvial <br /> groundwater typically exceed 10,000 milligrams per liter. The appendix <br /> also notes that surface water concentrations of boron and TDS in area <br /> surface waters (i.e., the un-named tributary that flows into Dry Creek at <br /> the rail loop culverts RRC-19 and Stokes Gulch) are elevated above <br /> agricultural use benchmark values. <br />• The coal leachate concentrations (see Tab 15, Probable Hydrologic <br /> Consequences) indicate that the coal moved through the facility has a low <br /> leach potential and will not significantly increase constituent <br /> concentrations in area receiving waters. <br />• Finally, as Hayden, Colorado continues to grow and expand its urban <br /> boundary, it is anticipated that a significant portion of the growth will <br /> occur along Dry Creek (Russ Martin, Manager, Town of Hayden, personnel <br /> communication). This will most likely limit any expansion of flood <br /> irrigated lands downgradient of the Loadout permit area. <br />TR-07 6 Revised 03/06 <br />