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GENERAL34630
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Last modified
8/24/2016 7:56:00 PM
Creation date
11/23/2007 7:59:59 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981025
IBM Index Class Name
General Documents
Doc Date
7/28/2003
Doc Name
Proposed Decision & Findings of Compliance For RN4
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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(a) unoff From Disturbed Areas <br />Disturbed surface areas from mining operations have been reclaimed. The operator <br />demonstrated in Bond Release SL-04 that contributions of suspended solids from these <br />reclaimed areas aze not greater that contributions from adjacent undisturbed azeas. There <br />has been no recorded overland surface flow from reclaimed disturbed azeas of the permit <br />to North Thompson Creek. <br />All former sediment control structures have been reclaimed, or permitted for retention for <br />other purposes. Reclamation activities associated with the removal of the four water <br />monitoring flume bases aze being managed by small azea exemption procedures. The <br />determination was thus made in Bond Releases SL•04 and SL-OS that there is no adverse <br />impact to surface waters by surface runoff from the mine site. <br />(b) Flows From Mine Portals <br />Seepage was noted in the vicinity of the No. 1 Mine portals on Apri128, 1988. This water <br />was determined to require treatment (a pH of 6.8, suspended solids of 2, 180 mg/1, and <br />recoverable iron at 120.6 mg/1). Collection systems were installed, and discharge was <br />treated by a drip hydroxide system to lower the pH and precipitate the iron, with <br />detention. Inter, the drip system was determined to be unnecessary; detention without <br />chemical treatment was sufficient. This flow now comes from the No. 1 Mine airshaft and <br />is conveyed to the current treatment system. The current treatment system consists of <br />collection and transmission pipes, and a series of ponds (Long Pond, Treatment Pond 1, <br />Treatment Pond 2, and the option for additional treatment in Pond P-9). There is no <br />mixing of surface runoff from disturbed areas with these mine water dischazges. Water <br />from the mine water treatment ponds bypasses sediment ponds and is dischazged to North <br />Thompson Creek at CDPS Outfa11001. The locations of the portal areas, the mine water <br />collection system, and treatment ponds aze shown on Drawing D-3-2 of the PAP. <br />Analyses on September 8 and October 12, 2002 of the untreated dischazge from the No. 1 <br />Mine indicate that the untreated dischazge met water quality pazameters of the CDPS <br />permit requirements without treatment in the detention ponds. However, the discharge is <br />passed through the detention ponds and dischazged at the pemutted Outfal1001. <br />Prior to the middle of 1995, the mine water discharge at Mine No. 3 was from a point <br />source inflow (spring) within the mitre. This spring dischazge, consistently less than 10 <br />gallons per minute, was of good quality and, from 1986 to mid 1995, was slightly alkaline <br />with no history of iron or sediment problems. It was piped to the surface and discharged <br />directly to North Thompson Creek at a former CDPS dischazge point 007. Groundwater <br />inflows began to fill Mine No. 3 after cessation of mining and pumping. Flooded mitre <br />waters neazly dischazged in 1993 (rose to near-portal elevation), but then resided. From <br />1991 through1993, iron (total) concentrations in the spring flow were below 0.02 mg./l. <br />Concentrations of iron in the spring dischazge rose from values azound 0.02 mg/1 on April <br />30, 1994, to 0.055 mgll on May 16, 1995, and a significant increase in dischazge flow rate <br />20 <br />
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