2013-10-02_PERMIT FILE - C1981019A (3)

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RULE 2 PERMITS Baseline surface water monitoring data are presented in Table 2.04.7-34 and Table 2.04.7-35. Streamflow hydrographs for representative surface water monitoring locations in these drainages are presented in figures 2.04.7-22 to 2.04.7-28. Surface water quality as measured by specific conductance is also illustrated to show seasonal variability with respect to stream flows. Good Spring Creek -Flow measurements obtained from surface water monitoring locations in Good Spring Creek in 1996/97 ranged from 0.85 cfs at New Upper Good Spring Creek (NUGSC) to 17.0 cfs at Lower Good Spring Creek (LGSC). Flows increased in the late spring and early summer months, corresponding to periods of high snowmelt and surface runoff. Flows measured in 1999/2000 ranged From 0.2 to 13.0 cfs at EFGSC, 0.26 to 7.0 cfs at Lower West Fork Good Springs Creek (LWFGSC), and 0.18 to 6.5 cfs at Upper West Fork Good Springs Creek (UWFGSC), respectively. Flows also increased in the late spring and early summer months. Taylor Creek, Wilson Creek, Jubb Creek -Flow measurements obtained from surface water monitoring locations in Taylor Creek in 1996/97 ranged from 0.01 cfs at Lower Taylor Creek (LTC) to 2.04 cfs at Upper Taylor Creek (UTC). These flows are typical of intermittent streams in the area. Surface water monitoring in Wilson Creek revealed flows that ranged from 0.2 cfs at Upper Wilson Creek (UWC) to 41.25 cfs at Lower Wilson Creek (LWC). Increases in flows were also observed to coincide with periods of snowmelt and spring runoff. Measured flows in Jubb Creek illustrated the ephemeral nature of the drainage, ranging from 0.01 cfs at West Fork Jubb Creek (WFJC) and East Fotk Jubb Creek (EFJC) to 1.45 cfs at the confluence of Jubb Creek (CJC). Seeps and Springs -CDM identified 59 seeps and springs in May 1984 within the general area. Most were found by later investigations. Of these, 15 had sufficient flow to warrant study; these are • summarized in this permit revision. CDM investigated springs during an unusually wet year; their reported spring flows during April and May are substantially higher than those reported by later investigators (CDM, 1985b). JBR Environmental Consultants, Inc. (JBR) surveyed the South Taylor/Lower Wilson permit revision area in 1997 to determine the occurrences of groundwater discharge in the form of seeps and springs. Three study areas were surveyed. Study Area A included the azea of Colowyo's existing mining operations. Study Area B, south and west of Study Area A, included portions of Good Spring Creek, Wilson Creek, and Taylor Creek. Study Area C, located west of Study Area A, included two shoR reaches of Wilson Creek on the east, and the Upper branches of Straight Gulch on the west. The intervening area included the East and West forks of Jubb Creek. The surveys were conducted during the late summer months (August and September), when base flow conditions have typically been reached. The surveys were conducted in a year with above average precipitation, and thus, surface flows in the study areas were significantly higher than normal late-summer flows (JBR, 1998a, 1998b, 1997). The JBR surveys identified 17 potential seeps and springs in Study Area A, 29 in Study Area B, and more than 60 in Study Area C (JBR, 1998a, 1998b, 1997). Most of the seeps and springs identified in the surveys were found in or near drainage bottoms. Development of small stock ponds had taken place below many of the springs. The surveys did not include water quality sampling. f~J South Taybr/Lower Wilson-Rule 2, Page 47 Revision Date: 1 I/30/06 Revision No.: PR-02