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Site conditions DRAFT ' 4 ~a~1a~F' Saturated alluvium likely occurs in each of the main drainages including Straight Gulch, Collom Gulch, Little Collom Gulch, and Jub ree sed on existing information, the alluvium is not expected to be more 40-ft thick a water levels are likely to have significant seasonal fluctuations. he alluvium of ach of these drainages is also considered a monitoring target. 2.5 Surface water The proposed operation is located within the watershed of the Yampa River. Individual watersheds within the project area include Straight Gulch, Collom Gulch, Little Collom Gulch, and Jubb Creek. Jubb Creek joins Wilson Creek before it flows into the Yampa. The remainin _drainages flow into Morgan Gulch before it joins the Yampa. Two stream gauging stati s were maintained by the USGS in the past on Jubb Creek and-Morgan Gulches period of record for these two stations is: 1975 to 1981 and 1980 to 1981, respectively. ca6out 5 to 10 ft. 2.6'-'Proposed operation In general the surface water courses are narrow channels deeply incised into the r oo The channels are typically a few feet across in width and incised The proposed Collom Pit is shown on Plan 1. The mine plan is still being developed and the following presents the most current development scenario. Mining will likely occur in four phases the first two of which are indicated on Plan 1. Mining would then proceed to the NW and SE "wings" in later phases. An initial box cut will likely be made at the down dip or northern extent of mining. Mining is expected to proceed up dip using either om 1 n of truck shovel and dragline or just truck shovel. Material from the initial box cuts will a placed as valley fill in Little Collom Gulch. The exact footprint of this valley fill ha not been determined. ~Y ~ ~~ n~,`S tl~V' ~~~~~~~~ ~~ "'n.~ta/~' ~(P~~`_- /I v 2572-Rf Colowyo Coal Company, L.P. Water Management Consultants