2009-08-13_PERMIT FILE - C1981019A (4)

Home Browse Search

RULE 2 PERMITS Colowyo monitored 14 seeps and springs within the permit revision area in June-August 1999 and from two springs from March 2005 -March 2006, and will monitor all springs shown in Table 2.05.6-2 from March 2006 to March 2007. Nine of those locations corresponded to seeps and springs identified in the JBR surveys. Measurable flows during all monitoring periods ranged from 0.5 gpm at SPRLW-02 to 317 gpm at JCS-I. Flow data from all sources are summarized on Table 2.05.6-2, and the locations of all monitored springs and seeps are shown on Map 10A. Surface Water Quality -Surface water samples were collected in the South Taylor/Lower Wilson permit revision area as part of the baseline monitoring studies conducted by Colowyo in 1996/1997, 1999/2000, and 2005-2006. Water quality data obtained from surface water monitoring locations in Good Spring, Taylor, Wilson, and Jubb creeks are presented in Table 2.04.7-34 and Table 2.04.7-35. These tables include those constituents identified in Rule 2.04.7(2)(b)(ii), except for acidity and dissolved iron, which were not analyzed. Values presented for iron and manganese represent total recoverable concentrations. Trilinear diagrams depicting the mean water quality data from these surface water monitoring locations are presented in figures 2.04.7-29 through 2.04.7-32. Surface water quality in each of these drainages is discussed below. Good Sorin Creek -The water quality in Good Spring Creek is principally magnesium sulfate or magnesium-bicarbonate. The total dissolved solids content ranged from 480 mg/L at UWFGSC to 1,600 mg/L at LWFGSC. Average TDS values for all monitoring locations exceeded the USEPA secondary drinking water standard for TDS of 500 mg/L. In addition, although the mean total recoverable iron concentration of 0.6 to 0.8 mg/L in Good Spring Creek is below the USEPA aquatic life standard of 1.0 mg/L, the individual samples often exceeded this standard. Tavlor Creek -The water quality in Taylor Creek is principally magnesium-bicarbonate or magnesium- sulfate. The average TDS ranged from 530 mg/L at UTC to 1,210 mg/L at LTC. The mean total recoverable concentration of iron of 0.3-0.6 mg/L is below the USEPA aquatic life standard for the monitoring period, although some individual samples exceeded this standard. Wilson Creek - Bicazbonate and sulfate appear to be the dominant anions that characterize the water quality in Wilson Creek, with calcium, magnesium, and sodium generally occurring in equal proportions. TDS concentrations in Wilson Creek are typically lower than those measured in the other drainages in the general area. TDS values ranged from 560 mg/L in UWC to 920 mg/L in LWC. Mean total recoverable iron concentrations of 0.7 to 5.6 mg/L exceeded the USEPA aquatic life standard in three of the four monitoring locations. Jubb Creek -The water quality in Jubb Creek is also magnesium-bicarbonate or magnesium-sulfate, similar to Taylor Creek. The average TDS ranged from 950 mg/L at WFJC to 1,550 mg/L at CJC. The average total concentrations of iron in the West and East Forks of Jubb Creek exceeded the USEPA aquatic life standard for the monitoring period, however, the total recoverable iron value in the main stem of Jubb Creek was below the standard for the monitoring period. Additional water quality data for these water monitoring locations may be found in the Annual Hydrologic Reports submitted by Colowyo to CDMG. It South TaybdLower Wilson -Rule 2, Page 48 Revision Dale: 11 /30/06 Revision No.: PR-02