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RULE 2 PERMITS <br />mg/L at LWFGSC. Average TDS values for all monitoring locations exceeded the USEPA secondary <br />drinking water standard for TDS of 500 mg/L. In addition, although the mean total recoverable iron <br />concentration of 0.6 to 0.8 mg/L in Good Spring Creek is below the USEPA aquatic life standard of 1.0 <br />mg/L, the individual samples often exceeded this standard. <br />Taylor Creek — The water quality in Taylor Creek is principally magnesium -bicarbonate or magnesium - <br />sulfate. The average TDS ranged from 530 mg/L at UTC to 1,210 mg/L at LTC. The mean total <br />recoverable concentration of iron of 0.3-0.6 mg/L is below the USEPA aquatic life standard for the <br />monitoring period, although some individual samples exceeded this standard. <br />Wilson Creek — Bicarbonate and sulfate appear to be the dominant anions that characterize the water <br />quality in Wilson Creek, with calcium, magnesium, and sodium generally occurring in equal proportions. <br />TDS concentrations in Wilson Creek are typically lower than those measured in the other drainages in the <br />general area. TDS values ranged from 560 mg/L in UWC to 920 mg/L in LWC. Mean total recoverable <br />iron concentrations of 0.7 to 5.6 mg/L exceeded the USEPA aquatic life standard in three of the four <br />monitoring locations. <br />Jubb Creek — The water quality in Jubb Creek is also magnesium -bicarbonate or magnesium -sulfate, <br />similar to Taylor Creek. The average TDS ranged from 950 mg/L at WFJC to 1,550 mg/L at CJC. The <br />average total concentrations of iron in the West and East Forks of Jubb Creek exceeded the USEPA <br />aquatic life standard for the monitoring period, however, the total recoverable iron value in the main stem <br />of Jubb Creek was below the standard for the monitoring period. <br />Additional water quality data for these water monitoring locations may be found in the Annual <br />Hydrologic Reports submitted by Colowyo to Division. <br />2.04.7 (3) Alternative Water Supply <br />Colowyo's mining operations in the South Taylor/Lower Wilson area are not expected to cause <br />significant contamination, diminution, or interruption of surface or groundwater resources, based on <br />information provided in Section 2.05.6. The potential diminution that may result during mining is within <br />the water rights held by Colowyo. <br />2.04.8 Climatological Information <br />Please see Section 2.04.8 in Volume 1. <br />2.04.9 Soils Resource Information <br />The objective of this section is to meet the requirements of Rule 2.04.9 et seq. by furnishing soils <br />information for the South Taylor/Lower Wilson permit revision mining areas in sufficient detail to <br />determine the following: <br />• General distribution, properties and present and potential productivity of soils within the mining <br />areas; <br />• Distribution, suitability, and average salvage depths of soils within the disturbed areas associated <br />with the mining areas; and, <br />• Quantity of salvageable suitable soil material for use in the reclamation of the disturbed areas <br />associated with the mining. <br />South Taylor/Lower Wilson — Rule 2, Page 29 Revision Date: 4/7/17 <br />Revision No.: RN -07 <br />