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GENERAL42468
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GENERAL42468
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Last modified
8/24/2016 8:11:03 PM
Creation date
11/23/2007 11:47:53 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
General Documents
Doc Date
8/26/1985
Doc Name
Proposed Decision & Findings of Compliance for PR1
From
Addition of 1,630 Acres
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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<br />-27- <br />with limited recharge areas, or may represent flows through fracture <br />zones extending to the surface which have narrow recharge zones on <br />steep slopes. <br />Description of the Surface Water Regime <br />The North Fork of the Gunnison River is the major drainage for the <br />general area. .Smaller streams in or adjacent to the life-of-mine areas <br />are all tributary to the North Fork (Figure 1). Figure 4 contains the <br />drainage map of the study area with the locations of streams and <br />reservoirs which are described in the following discussion. <br />The North Fork has an annual streamflow at Somerset of approximately <br />313,200 acre-feet per year (1933-1982). The flow is regulated by the <br />Paonia Reservoir 5 miles upstream of the town of Somerset, which became <br />operational in 1962. Water yields during that period have ranged from <br />a high of 451,300 acre-feet per year in water year 1962 to a low of <br />82,270 acre-feet in water year 1977. Flow records for the North Fork <br />of the Gunnison are given in Table 2. Water quality parameters for the <br />North Fork are given in Table 3. As indicated, water in the North Fork <br />is a calcium bicarbonate type. There are moderate levels of sulfate. <br />Salinity averages less than 100 mg/1. <br />Just below Paonia Reservoir, Muddy Creek and: Anthracite Creek join to <br />form the North Fork of the Gunnison. Anthracite Creek contributes <br />about two-thirds of the flow to the North Fork. Anthracite Creek is a <br />perennial stream with ari average annual yield of 157,313 acre-feet for <br />the period of record between July, 1977 to October, 1980 (U.S.G.S., <br />Water Research Data). This corresponds to an average flow rate of 217 <br />cfs. The highest discharge recorded was 4,200 cfs on May 27, 1979. <br />Low flows of 12 cfs have been recorded several times during the period <br />of record. <br />The water of Anthracite Creek is an alkaline, moderately hard, <br />calcium-bicarbonate type water with an average total dissolved solids <br />concentration of 71.6 mg/1, average pH is 7.8. Total suspended solids <br />average approximately 25 mg/1. Dissolved metal concentrations are low <br />throughout the year, and total metal concentrations are directly <br />related to the total suspended solids concentrations. <br />The Hawk's Nest life-of-mine area is drained by nine ephemeral <br />streams. Two of the gulches have had two water samples collected <br />during 1980, once when they were flowing during snowmelt and once <br />during a thunderstorm event. The water is alkaline with an average <br />total dissolved solids concentration of 121 mg/1. Total suspended <br />solids concentrations are low. <br />There are a total of eleven springs and seeps within or adjacent to the <br />Hawk's Nest Mines, three are perennial. The maximum total flow from <br />all springs during the summer of 1982 was 16.085 gpm. <br />x <br />
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