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'Walsh <br />Environmental Scientists and Engineers, LLC <br />April 2005, flow was not observed. Several small stock ponds have been developed in the <br />lower reach and have contained water on occasion. <br />Callum Gulch <br />Collom Gulch is located near the center of the proposed lease area. Above sampling point <br />LCG, it drains approximately 5.05 square miles of hilly terrain. The elevation of the <br />stream channel ranges from 6,457 feet amsl where it crosses Moffat County Road 51 to <br />greater than 7,800 feet amsl near the summit of the Danforth Hills. The stream channel <br />runs north- northeast through the Collom Syncline and then across the pediment slope <br />north of the syncline before joining Morgan Gulch. Collom Gulch is an intermittent <br />stream through out its entire length. The upper and lower reaches of Collom Gulch flow <br />in a relatively narrow valley. The middle reach flows in a flat, wide valley bottom just <br />south of the synclinal axis. There is little sinuosity developed except in the middle reach <br />where the channel is braided. In December 2004, January 2005, and February 2005, there <br />was no flow at the upper Collom Gulch sampling point (UCG). Flow at the lower Collom <br />Gulch sampling point (LCG) ranged from 2.6 gpm in December 2004 to about 30 gpm in <br />February 2005. Flow began to increase in the spring due to snowmelt and increased <br />precipitation. In April 2005, stream flow at the upper Collom Gulch station was about <br />340 gpm whereas flow at the lower Collom Gulch station was about 90 gpm. This <br />indicates that snowmelt in the upper reach is infiltrating into the Collom Gulch valley fill <br />during the spring. In the summer and fall, this recharge probably contributes to stream <br />flow in lower Collom Gulch as groundwater discharge to the stream. <br />Straight Gulch <br />Straight Gulch is located on the western edge of the proposed lease area. Above sampling <br />point LSG, it drains approximately 7.51 square miles of hilly terrain. The elevation of the <br />stream channel ranges from 6,639 feet amsl at the confluence of Straight Gulch and <br />Morgan Gulch to approximately 7,800 feet amsl near the summit of the Danforth Hills. <br />The stream channel runs north - northeast across the south limb of the Collom Syncline <br />and merges with Morgan Gulch south of the synclinal axis. Straight Gulch is an <br />intermittent stream below sampling point USG. The upper reach of Straight Gulch is in a <br />narrow valley and the channel is incised 10 -15 feet into the valley fill. The valley widens <br />to the south. In December 2004 through January 2005, flows at the upper Straight Gulch <br />sampling station (USG) ranged from 10 to 20 gpm. During the same period, flows at the <br />lower Straight Gulch sampling station (LSG) ranged from about 5 to 35 gpm. Flow <br />increased at both stations in February 2004 with the upper station estimated at 110 gpm <br />and the lower station at 225 gpm. Flow at both stations was about 100 gpm in March <br />2004 and 225 gpm in April 2004. <br />Springs and Seeps <br />Springs and seeps were inventoried and sampled in December 2004 by WMC (2005). <br />Sites in and around the lease area were evaluated where enhanced vegetation and grasses <br />indicated the potential for seeps. Ten spring locations were identified and inventoried. <br />The locations of the springs are shown on Figure 8. Table 4 summaries spring and seep <br />attributes. Descriptions of the springs and seeps follow (WMC 2005). <br />P'PROJECTS'Colou vo 0 I88 EA Final n1.M, -EA Collom 08 . .1 on dnc <br />28 <br />