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Water Quality Monitoring Plan Climax Molybdenum Company <br /> Version:R4 Permit No. M-1977-493 <br /> Table 7-2—Surface Water Monitoring Analytical Methods <br /> Detection Limit <br /> Analytical Parameter EPA Method (mg/L) Hold Time <br /> Indicator Parameters <br /> Cadmium,dissolved M200.8 ICP-MS 0.0001 6 months <br /> Copper,dissolved M200.8 ICP-MS 0.0005 6 months <br /> Iron,dissolved and total M200.7 ICP 0.02 6 months <br /> recoverable <br /> Manganese,dissolved M200.7 ICP 0.005 6 months <br /> Molybdenum,dissolved and total M200.8 ICP-MS 0.0005 6 months <br /> recoverable <br /> Zinc,dissolved M200.7 ICP 0.01 6 months <br /> pH (field) 9040C 0.1 NA <br /> Sulfate(SO4) D516-02 1 28 days <br /> Total Dissolved Solids(TDS) SM2540C 10 7 days <br /> Hardness SM2340B 0.8 6 months <br /> 7.3 Quality Assurance/Quality Control <br /> Climax will ensure data quality through field and laboratory QA/QC procedures, data reporting and <br /> evaluation. <br /> 7.3.1 Field Duplicate <br /> Field duplicates are co-located samples collected identically and consecutively over a minimum period of <br /> time. Field duplicates are sent to the same laboratory and analyzed for identical analytical parameters. <br /> One duplicate sample will be collected during each quarterly sampling event. The sample location for the <br /> field duplicate shall be selected randomly prior to each sampling event. <br /> 7.3.2 Laboratory Quality Assurance/Quality Control <br /> The laboratory selected to analyze the water samples will operate under an internal quality assurance plan. <br /> Laboratory quality control (QC) includes method blanks, analytical duplicates, matrix spikes, matrix spike <br /> duplicates, calibration checks, surrogates and laboratory control standards, as required by the referenced <br /> analytical method. <br /> 7.3.3 Data Reporting <br /> The analytical reports submitted by the laboratory under this monitoring plan will include, at a minimum, the <br /> following information: <br /> ■ A copy of the chain of custody form, including the date of sample receipt; <br /> ■ Sample temperature upon receipt at the laboratory; <br /> ■ Field and laboratory sample identification numbers; <br /> ■ Sampling date and time; <br /> EPP—Appendix C May 2018 34 <br />