2011-08-08_REVISION - M1977493 ‎(36)‎

• Permit No: M1977493
• IBM Index Class Name: REVISION
• Doc Date: 8/8/2011
• Doc Name: EPP- Water Quality Monitoring Plan.
• From: Climax Molybdenum
• To: DRMS
• Type & Sequence: TR18
• Media Type: D
• Archive: No

Analytical Parameter
Frequency
NPL (mg/L)
NPL Basis
(see notes)
Cadmium, dissolved
Quarterly
0.005
Table 1,
CBSG
Copper, dissolved
Quarterly
1.0
Table 2,
CBSG
Iron, dissolved
Quarterly
0.3
Table 2,
CBSG
Lead, dissolved
Quarterly
0.05
Table 1,
CBSG
Manganese, dissolved
Quarterly
0.44
Ambient
Molybdenum, dissolved
Quarterly
0.035
Table 1,
CBSG
Zinc, dissolved
Quarterly
5.0
Table 2,
CBSG
pH
Quarterly
6.5 — 8.5
Table 2,
CBSG
Sulfate (SO4)
Quarterly
250
Table 2,
CBSG
Total Dissolved Solids (TDS)
Quarterly
NA (report)
NA
Although the CBSG for Domestic Use (Tables 1 and 2) may not be directly applicable to the
• groundwater in the upper Arkansas River Watershed, they have been used as the basis for
selecting numeric limits protective of groundwater. Observed manganese concentrations in
ARwell exceed the secondary drinking water standard listed in Table 2 of the CBSG, with an
average concentration of 0.21 mg /I. To prevent further degradation that would threaten the
quality of surface water, an alternate NPL for manganese has been selected using existing
ambient quality as of January 31, 1994.
Table 4 -1 lists the parameters to be measured and the applicable NPL. The methodology for
determining whether an analytical result exceeds the NPLs is discussed in Section 5.
•
•
Water Quality Monitoring Plan Climax Molybdenum Company
Permit No. M- 1977 -493
Version: R1
EPP — Appendix C
Table 4 -1 — ARwell Numeric Protection Limits
Notes:
Table 1, CBSG: Domestic Use Human Health Standards
Table 2, CBSG: Domestic Use Secondary Drinking Water Standards
Ambient: Mean concentration of first five samples collected subsequent to January 31, 1994.
4.2.2 Eagle River Watershed
The POC for this watershed is anticipated to be EVMW -3, a proposed new well below the 4
Dam Seepage collection system and upgradient of the East Fork of the Eagle River. A baseline
dataset will be collected prior to the establishment of the NPLs to be used. The expanded
baseline parameter list is presented in Section 4.1.1. Table 4 -2 lists the parameters anticipated
to be measured at this well following the baseline period. The baseline dataset will be collected
over a 2 to 2 'h year period to provide a minimum of 5 samples. Following collection of the
baseline data, results will be reviewed to verify or modify the routine monitoring parameters, and
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