PERMFILE106702

• Permit No: M1977378
• IBM Index Class Name: Permit File
• Doc Date: 1/17/1995
• Doc Name: SUNNYSIDE GOLD CORP VOLUNTARY MITIGATION ASSUMPTIONS & POSITION
• Media Type: D
• Archive: No

• Assumptions:
- Bulkheads or constructed wetland remediation are
technically feasible.
- Project would be 708 effective fox metal loading
reduction.
- Projects are feasible from an ownership and
liability standpoint.
- Flows were either the average of available flow data
or constant if only one measurement was available.
c. BMP Projects
Methodology:
- Tailings Ponds were sampled.
- Mine dumps and related disturbances were sampled
based on field paste pH.
- Samples were analyzed for total metals.
- Samples were analyzed for dissolved metals using
TCLP-1312 exposure method.
- Samples were analyzed for dissolved metals after a
1:1 sample:water 30 minute bath.
- A stormwater sample was taken at one of ttie sites
for comparison to the prediction methods.
- Annual precipitation data was collected from two
weather stations (Silverton and Red Mountain).
Annual precipitation amounts were assigned to each
• site based on elevation @ 1/4 intervals betcaeen the
weather stations (all sites are at or between the
elevations of the weather stations).
- Other factors were noted (i.e. if surface :=lows
exist or if groundwater is thought or known to be
present) but not included in the evaluation to-
date.
- Areas and volumes were roughly measured or
estimated fox initial evaluation.
Assumptions:
- TCLP-1312 exposure method is applicable in high
water to solid ratio exposures (i. e. groundwater or
surface water flow exposures).
- A 1:1 water-bath exposure method is applicable for
most precipitation events.
- A 988 cleanup efficiency can be achieved over time
for tailings BMP Projects.
- A 958 cleanup efficiency can be achieved aver time
for mine dump BMP Projects.
- 1008 of average precipitation is available 1; or metal
transport.
- Projects are feasible from an ownership ar~d
liability standpoint.
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