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RULE 2 PERMITS <br />Taylor Creek, Wilson Creek, Jubb Creek — Flow measurements obtained from surface water monitoring <br />locations in Taylor Creek in 1996/97 ranged from 0.01 cfs at Lower Taylor Creek (LTC) to 2.04 cfs at <br />Upper Taylor Creek (UTC). These flows are typical of intermittent streams in the area. Surface water <br />monitoring in Wilson Creek revealed flows that ranged from 0.2 cfs at Upper Wilson Creek (UWC) to <br />41.25 cfs at Lower Wilson Creek (LWC). Increases in flows were also observed to coincide with periods <br />of snowmelt and spring runoff. Measured flows in Jubb Creek illustrated the ephemeral nature of the <br />drainage, ranging from 0.01 cfs at West Fork Jubb Creek (WFJC) and East Fork Jubb Creek (EFJC) to <br />1.45 cfs at the confluence of Jubb Creek (CJC). <br />Seeps and Springs — CDM identified 59 seeps and springs in May 1984 within the general area. Most <br />were found by later investigations. Of these, 15 had sufficient flow to warrant study; these are <br />summarized in this permit revision. CDM investigated springs during an unusually wet year; their <br />reported spring flows during April and May are substantially higher than those reported by later <br />investigators (CDM, 1985b). <br />JBR Environmental Consultants, Inc. (JBR) surveyed the South Taylor/Lower Wilson permit revision <br />area in 1997 to determine the occurrences of groundwater discharge in the form of seeps and springs. <br />Three study areas were surveyed. Study Area A included the area of Colowyo's existing mining <br />operations. Study Area B, south and west of Study Area A, included portions of Good Spring Creek, <br />Wilson Creek, and Taylor Creek. Study Area C, located west of Study Area A, included two short <br />reaches of Wilson Creek on the east, and the Upper branches of Straight Gulch on the west. The <br />intervening area included the East and West forks of Jubb Creek. The surveys were conducted during the <br />late summer months (August and September), when base flow conditions have typically been reached. <br />The surveys were conducted in a year with above average precipitation, and thus, surface flows in the <br />study areas were significantly higher than normal late -summer flows (JBR, 1998a, 1998b, 1997). <br />The JBR surveys identified 17 potential seeps and springs in Study Area A, 29 in Study Area B, and more <br />than 60 in Study Area C (JBR, 1998a, 1998b, 1997). Most of the seeps and springs identified in the <br />surveys were found in or near drainage bottoms. Development of small stock ponds had taken place <br />below many of the springs. The surveys did not include water quality sampling. <br />Colowyo monitored 14 seeps and springs within the permit revision area in June -August 1999 and from <br />two springs from March 2005 — March 2006, and will monitor all springs shown in Table 2.05.6-2 from <br />March 2006 to March 2007. Nine of those locations corresponded to seeps and springs identified in the <br />JBR surveys. Measurable flows during all monitoring periods ranged from 0.5 gpm at SPRLW-02 to 317 <br />gpm at JCS -1. Flow data from all sources are summarized on Table 2.05.6-2, and the locations of all <br />monitored springs and seeps are shown on Map 10. <br />Surface Water Quality — Surface water samples were collected in the South Taylor/Lower Wilson <br />permit revision area as part of the baseline monitoring studies conducted by Colowyo in 1996/1997, <br />1999/2000, and 2005-2006. Water quality data obtained from surface water monitoring locations in Good <br />Spring, Taylor, Wilson, and Jubb creeks are presented in Table 2.04.7-34 and Table 2.04.7-35. These <br />tables include those constituents identified in Rule 2.04.7(2)(b)(ii), except for acidity and dissolved iron, <br />which were not analyzed. Values presented for iron and manganese represent total recoverable <br />concentrations. Trilinear diagrams depicting the mean water quality data from these surface water <br />monitoring locations are presented in figures 2.04.7-29 through 2.04.7-32. Surface water quality in each <br />of these drainages is discussed below. <br />Good Spring Creek — The water quality in Good Spring Creek is principally magnesium sulfate or <br />magnesium -bicarbonate. The total dissolved solids content ranged from 480 mg/L at UWFGSC to 1,600 <br />South Taylor/Lower Wilson — Rule 2, Page 28 Revision Date: 11 / 18/16 <br />Revision No.: MR -163 <br />