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2010-04-20_REVISION - M1977300 (9)
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2010-04-20_REVISION - M1977300 (9)
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Last modified
8/24/2016 4:08:26 PM
Creation date
4/22/2010 3:28:56 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1977300
IBM Index Class Name
REVISION
Doc Date
4/20/2010
Doc Name
12-20
From
Whetstone
To
DRMS
Type & Sequence
TR11
Media Type
D
Archive
No
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Environmental Protection Plan, Schwartzwalder Mine 12-1 <br />12. WATER QUALITY MONITORING PLAN <br />A Water Quality Monitoring Plan for surface water and groundwater is in effect at the Schwartzwalder <br />Mine in compliance with License Condition 23.0 and 23.2 of RML 369-03S; Amendment 08. Table 12-1 <br />summarizes the sampling stations and sampling frequency in surface water, while Table 12-2 lists the <br />active groundwater monitoring wells and sampling stations. The Monitoring Plan is also attached. <br />Surface water monitoring is conducted monthly at six sampling locations on Ralston Creek (Table 12-1). <br />Samples are analyzed for a limited analytical suite (dissolved and suspended uranium, and radium-226) or <br />for an extended analytical suite. The extended analytical suite includes 29 parameters (major ions, physical <br />properties, total metals, dissolved metals and dissolved radionuclides). <br />Groundwater monitoring is conducted quarterly at twelve monitoring wells and one domestic well (Table <br />12-2). The extended analytical suite in groundwater is the same as that used for surface water extended <br />analysis (29 parameters, including major ions, physical properties, total metals, dissolved metals and <br />dissolved radionuclides). Two or three monitoring wells are sampled for the extended analytical suite each <br />quarter, and the remaining wells are sampled for the limited analytical suite. Dry wells cannot be sampled <br />for water quality, but are always checked for changes in groundwater level and will be sampled if sufficient <br />water becomes available. Monitoring well #10 (MW10) was improperly completed and is not monitored <br />for water quality; however, water levels will continue to be monitored in MW 10. The domestic well is <br />sampled quarterly for the limited analytical suite. <br />Two bedrock monitoring wells are proposed, for the purpose of determining water levels (head) and flow <br />conditions in bedrock east of the mine site (Table 12-3). The paired wells are proposed along the Schwartz <br />Trend, to identify downward vertical gradients and the existence of a groundwater divide between the mine <br />and Ralston Creek. The new wells are discussed in Section 15. If sampled for water quality, approved <br />passive sampling methods would be employed (Tedlar bag, diffusion samplers, SNAP samplers, <br />HydraSleeve®, or other passive methods) because hydraulic conductivities are so low that unnatural <br />gradients may be induced by well purging. <br />Additional samples may be collected at Sump 1 and Sump 4, although monitoring at these stations is not <br />required under the currently approved monitoring plan. Water samples from the sumps are typically <br />analyzed for dissolved uranium, only. <br />Water quality in the flooded mine shaft is sampled quarterly, when site conditions allow, and analyzed for <br />the extended analytical suite for mine pool water. In winter months, problems associated with snow and <br />freezing conditions may prevent sampling of mine pool water. The mine pool will be sampled for the <br />comprehensive analytical suite for at least eight quarters. At the end of eight quarters, the analytical suite <br />and monitoring frequency may be reevaluated and possibly modified based on the assessment. <br /> <br />4109C.100419
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