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RULE 2 PERMITS <br />Gulch. Little Collom Gulch is an ephemeral stream throughout its entire length. Several small stock <br />ponds have been developed in the lower reach and have contained water on occasion. <br />Much of Little Collom Gulch is located within the proposed Collom Pit and spoil piles. As a result, an <br />upgradient monitoring station was not established. Sampling point LLCG is located immediately <br />adjacent to valley fill well MLC -04-01 east and just above the confluence of Little Collom and Collom <br />Gulches (Map IOB). <br />Jubb Creek — Jubb Creek is located on the eastern side of the Collom permit expansion area. Above the <br />USGS gaging station, it drains approximately 7.53 square miles of hilly plateau terrain. The elevation of <br />the stream channel ranges from about 6,400 ft amsl where it crosses Moffat County Road 51 north of the <br />Collom Syncline, to approximately 7,600 ft amsl near the summit of the Danforth Hills. The two forks of <br />Jubb Creek (East and West) join at approximately 6,700 ft amsl (Map IOB). The stream channel runs in a <br />northeasterly direction across the Collom Syncline before joining Wilson Creek several miles northeast of <br />the Trout Creek Sandstone outcrop. Jubb Creek generally has no flow during the winter. Flow in Jubb <br />Creek is partially controlled by several small stock ponds located on both the East and West Forks of <br />Jubb Creek. <br />The upper reaches of the West Fork of Jubb Creek lie just east of the footprint of the proposed Collom <br />Pit. Two sampling stations established in 1996 (EFJC and WFJC) are located in the east and west forks <br />of Jubb Creek, respectively (Map 10B). During the pre -feasibility study, no surface water flow was <br />observed at either location. To monitor surface water quality downstream of the proposed mine, Jubb <br />Creek sampling location CJC, located at the confluence of East and West Jubb Creeks adjacent to valley <br />fill monitoring well MJ -95-03, was used. Samples were collected from all three locations by KEC in <br />1996 and 1997. <br />Surface Water Quantity — Baseline monitoring was conducted from December 2004 through May 2006 <br />in the Collom Gulch, Little Collom Gulch, and Jubb Creek drainages. Field flow measurements were <br />taken monthly at stream flow sampling locations, unless prevented by frozen or non-existent flow. Field <br />flow measurements were attempted twice a year at springs and seeps. <br />Based on the flow monitoring in 2004 through 2006, conditions in Little Collom Gulch and within the <br />upper Jubb Creek watershed were typical of intermittent or ephemeral streams, while the monitored <br />sections of Collom Gulch can be characterized as intermittent or perennial. Baseline surface water <br />monitoring data are presented in Tables 2.04.7-46 and 2.04.7-48. Streamflow hydrographs for <br />representative surface water monitoring locations in these drainages are presented in figures 2.04.7-40 to <br />2.04.7-43. Surface water quality as measured by total dissolved solids (TDS) is also illustrated to show <br />seasonal variability with respect to stream flows. Each drainage basin is discussed individually below. <br />Collom Gulch — Colowyo measured flows at two locations in Collom Gulch (UCG and LCG) that ranged <br />from 0.004 cfs to 3.5 cfs. Winter base flows ranged from 0.004 to 0.04 cfs. Maximum flows occurred in <br />June, corresponding to snowmelt, spring runoff and/or precipitation events. Summer base flows (July <br />through September) in Collom Gulch ranged from 0.01 to 0.03 cfs. Both Upper Collom Gulch and Lower <br />Collom Gulch exhibit intermittent or perennial characteristics, with spring high flows the apparent result <br />of snowmelt. Both are likely to be intermittent in dry years. Hydrographs for Collom Gulch sample <br />locations can be found in Figures 2.04.740 and 2.04.7-41. From the hydrographs, it can also be seen that <br />water quality, as represented by Total Dissolved Solids (TDS), varies seasonally in response to dilution <br />from spring runoff. <br />Little Collom Gulch — Little Collom Gulch was dry for all attempted monthly sampling events. Little <br />Collom Gulch can be considered ephemeral at sampling point LLCG. <br />Collom — Rule 2, Page 31 Revision Date: 12/30/16 <br />Revision No.: TR -108 <br />