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Water Quality Monitoring Plan Climax Molybdenum Company <br /> Version R4 Permit No M-1977-493 <br /> The established NPLs are described below for each of the watersheds. The data analysis approach to be <br /> used in evaluating routine monitoring data against the NPLs is described in Section 5.2. <br /> 5.1.1 Arkansas River Watershed <br /> The shallow, alluvial POC well within the Arkansas River Watershed is ARwell. This well is located near <br /> the Climax property boundary, downgradient from the Arkansas Pond. <br /> Table 5-1 lists the NPLs established for ARwell using CBSG table values for all parameters with the <br /> exception of manganese. As presented in Table B-1.3 in Appendix B-1, observed manganese <br /> concentrations in ARwell generally exceed the secondary drinking water standard for manganese listed in <br /> Table 2 of the CBSG. An NPL for manganese is not proposed at this time. <br /> Table 5-1-ARwell Numeric Protection Limits <br /> NPL Basis <br /> Analytical Parameter Frequency NPL(mg/L) (see notes) <br /> Cadmium,dissolved Quarterly 0.005 Table 1,CBSG <br /> Copper,dissolved Quarterly 0.2 Table 3,CBSG <br /> Iron,dissolved Quarterly 0.3 Table 2,CBSG <br /> Manganese,dissolved Quarterly TBD TBD <br /> Molybdenum,dissolved Quarterly 0.210 Table 1,CBSG <br /> Zinc,dissolved Quarterly 2.0 Table 3,CBSG <br /> pH Quarterly 6.5-8.5 Table 2,CBSG <br /> Sulfate(SO4) Quarterly 250 Table 2,CBSG <br /> Total Dissolved Solids(TDS) Quarterly 400 Table 4,CBSG <br /> NOTES: <br /> Table 1, CBSG Domestic Use Human Health Standards <br /> Table 2, CBSG- Domestic Use Secondary Drinking Water Standards <br /> Table 3, CBSG Agncultural Use Standards <br /> Table 4, CBSG. TDS Water Quality Standards <br /> TBD To be determined,an NPL for manganese will be established following the WQCC process referenced <br /> above and in consultation with DRMS and WQCD. <br /> EPP—Appendix C March 2018 22 <br />