2010-12-17_REVISION - C1981019 (153)

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Surface water 21 l 0 4.3.1 Jubb Creek Description Jubb Creek is located on the eastern side of the Collom study area. Above the USGS gaging station, it drains approximately 7.53 square miles of hilly plateau terrain. The elevation of the stream channel ranges from about 6,400 ft amsl where it crosses Moffat County Road 51 north of the Collom Syncline, to approximately 7,600 ft near the summit of the Danforth Hills. The two forks of Jubb Creek (East and West) join at approximately 6,700 ft amsl (Figure 4.1). The stream channel runs in a northeasterly direction across the Collom Syncline before joining Wilson Creek several miles northeast of the Trout Creek Sandstone outcrop. Historical flow data for Jubb Creek for the period 1975 through 1981 were collected at USGS gaging station 9250610 (Figure 4.1). The flow data (provided in Appendix 4.B) indicate that flow occurs from the spring through the fall, with maximum flow in May and June. Jubb Creek generally has no flow during the winter. From December 2004 to April 2005 flow ranged from approximately 5 to 110 gpm at sample location CJC. Flow in Jubb Creek is partially controlled by several small stockponds located on both the East and West Forks of Jubb Creek. At the time of monitoring, sediment transport was low, as would be expected except during flood events. Monitoring locations C The upper reaches of East and West Jubb Creeks are located within the footprint of the proposed Collom Mine. Two sampling stations established in 1996 (EFJC and WFJC) are located in the east and west forks of Jubb Creek, respectively (Figure 4.2). During the pre - feasibility study, no surface water flow was observed at either location. To monitor surface water quality downstream of the proposed mine, Jubb Creek sampling location CJC, located at the confluence of East and West Jubb Creeks adjacent to valley fill monitoring well MJ- 95 -03, was used. Samples were collected from all three locations by KEC in 1996 and 1997. 4.3.2 Little Collom Gulch Description Little Collom Gulch is located near the center of the Collom study area. Above its confluence with Collom Gulch, it drains approximately 2.9 square miles of hilly terrain. The elevation of the stream channel ranges from about 6,520 ft amsl at the confluence with Collom Gulch to approximately 7,800 ft amsl near the summit of the Danforth Hills. The stream channel runs in a northeasterly direction through hilly terrain until it turns to the west and joins the lower reach of Collom Gulch. Little Collom Gulch is an ephemeral stream throughout its entire length. During the period of December 2004 to April 2005, flow was not observed in Little Collom Gulch. Several small stock ponds have been developed in the lower reach and have contained water on occasion. 2572 -R2 colowyo Coal Company Water Management Consultants