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Water Quality Monitoring Plan Climax Molybdenum Company
<br /> Version. R4 Permit No M-1977-493
<br /> Additional Baseline Monitoring Parameters
<br /> Aluminum,dissolved Silver,dissolved
<br /> Antimony,dissolved Sodium,dissolved
<br /> Arsenic,dissolved Thallium,dissolved
<br /> Barium,dissolved Vanadium,dissolved
<br /> Beryllium,dissolved Bicarbonate(HCO3)
<br /> Calcium,dissolved Total Alkalinity
<br /> Chromium(Crlll+CrVI),dissolved Chloride,dissolved
<br /> Cobalt,dissolved Cyanide,WAD
<br /> Magnesium,dissolved Cyanide,total
<br /> Mercury,dissolved Fluoride,dissolved
<br /> Nickel,dissolved Total Nitrate+Nitrite as N
<br /> Potassium,dissolved Total Organic Carbon (TOC)
<br /> Selenium,dissolved
<br /> The following section describes the evaluation of these baseline data through the end of 2017 and, based
<br /> on this evaluation, provides the indicator parameter list for future long-term monitoring. NPLs for POC wells
<br /> are presented in Section 5.
<br /> 4.1.1.1 Groundwater Monitoring Baseline Data Evaluation
<br /> All groundwater monitoring data collected during the extended baseline monitoring period, as well as
<br /> previous data from the wells established prior to TR-18, are in Appendix B. Appendix B is organized by
<br /> watershed, with data for each groundwater monitoring location presented on individual tables. The data in
<br /> these tables has been summarized with descriptive statistics, including the calculation of the minimum,
<br /> maximum, and mean concentrations, the standard deviation, the number of data records, or analyses for
<br /> each analyte, and the number of observations below the method detection limit.
<br /> In the TR-18 WQMP, the program included monitoring the full parameter list for the initial five consecutive
<br /> quarters of monitoring,then reducing analyses to just the indicator parameter list. Baseline conditions have
<br /> been established for groundwater as a result of the extended monitoring conducted through the fourth
<br /> quarter of 2017 using the full parameter list.
<br /> Apparent increasing trends of several constituents in monitoring well EVMW-1S (below the Robinson Lake
<br /> seepage cut-off wall in the Eagle River Watershed) in 2013 resulted in increased monitoring, field
<br /> investigation and data evaluation efforts for this area of the Site(Tetra Tech, 2013 and Tetra Tech, 2014).
<br /> Through this effort sulfate, TDS, iron, and manganese were identified as the primary indicators of mining-
<br /> related influences on water quality, and are therefore the key indicator parameters at Climax in evaluating
<br /> water quality trends. As indicated in the 2013 and 2014 reports for the Robinson seep investigation, no
<br /> increases were observed in concentrations of other TR-18 indicator parameters cadmium, copper, lead,
<br /> molybdenum or zinc. Nevertheless, with the exception of lead, all of these parameters will remain on the
<br /> Climax indicator parameter list.
<br /> EPP—Appendix C March 2018 13
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