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GENERAL44107
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Last modified
8/24/2016 8:12:57 PM
Creation date
11/23/2007 12:50:48 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
General Documents
Doc Date
11/1/1986
Doc Name
Proposed Decision & Findings of Compliance for PR1
From
Life of Mine & Expansion of Operations
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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STIPULATION N0. 3 <br />THE PERMITTEE WILL PLACE STAFF GAUGES OR SIMILAR MEASURING DEVICES <br />ADJACENT TO ALLUVIAL WELLS ON FISH CREEK AND SURVEY THEM IN EVERY JULY <br />PRIOR TO SAMPLING ON AN ANNUAL BASIS. MONTHLY MONITORING OF THE ALLUVIAL <br />WELL WILL INCLUDE RECORDING OF THE STREAMS ELEVATION WITH THE STREAM <br />GAUGE. <br />A spring survey performed in May, 1986, along Fish Creek between Mine 2 <br />and the confluence found that springs constituted 1.3% of May flow, and <br />that the overlying Twentymile sandstone was responsible for 25% of the <br />spring flow. If these springs were to run at similar rates throughout <br />the year (a conservative assumption) they would contribute between 7 and <br />23% of base flow to the stream at site 1002. Should flow from springs <br />below the Twentymile sandstone be diminished by the Foidel Creek Mine, <br />there would still be adequate flow within the stream to sustain aquatic <br />life and dilute any salinity impacts from the mine (Table 9). <br />Backfilled spoils investigations were taking place at the adjacent <br />surface mines during the permitting process. Hydrographs from a large <br />spring indicated that peak flows were strongly dependent on recharge from <br />snowmelt and could run as high as 1.45 gpm/acre of backfilled spoils. <br />Average low flows were approximately 0.09 gpm/acre during a high flow <br />water year. Water quality in the backfilled spoils had TDS levels <br />averaging 4073 mg/1, sulfate concentrations averaging 2544 mg/l, and <br />total manganese values of 1.62 mg//1. The applicant calculated that the <br />salt plume from the adjacent surface mine's backfill was progressing at a <br />rate of 350 feet/year. Potential discharges from other surface mines <br />were incorporated into the CHIS in evaluating impacts to the surface <br />water drainage. <br />B. Surface Water Information <br />The surface water information within the permit revision application is <br />found in Sections 2.04.7 and 2.05.6 of Volume I, Exhibit 14 in Volume II, <br />Exhibits 28, 30, 32 and 33 in Volume III, Figures 3, 4, 5, 6, 8, 9, 10 <br />and 11 and Tables 10, 11, 62, 63, 64, 65 and 66 in Volume IV. <br />The Foidel Creek Mine will affect surface water in the upper Trout Creek <br />drainage through the discharge of mine water inflows during the life of <br />mine operation and through the discharge of waters from the flooded <br />workings following operations. During the life of mine permit review, <br />the influence of adjacent surface mines and discharges from the <br />associated spoils aquifers on the surface water regime were also <br />addressed. The latter issue had not been well-documented in the past, <br />and had to be understood to establish an appropriate frame of reference <br />for evaluating the effect of mine water discharges. Mine water discharge <br />impacts were far less than predicted impacts from spoils aquifers as is <br />documented in Section IX in the Cumulative Hydrologic Impact Study. <br />-16- <br />
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