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CMC—Henderson Operations <br /> 5-Quarter Water Quality Data and Baseline Parameters Report <br /> May 2014 <br /> ' The baseline water quality assessment did not result in the identification of any additional parameters that <br /> warranted consideration for inclusion in the established indicator parameter list for future monitoring at <br /> MLGW-15. The rationale used in selecting the original set of indicator parameters summarized in Section <br /> t4.1 of the GWMP, including consideration for trace elemental cations, anionic species, oxyanions and <br /> field data, appears to continue to be an appropriate approach for this well. As such, Henderson proposes <br /> ' to establish long term monitoring for the seven indicator parameters listed in GWMP Table 4-1: iron, <br /> manganese,selenium,zinc,conductivity,pH and sulfate. <br /> ' 3.2.3 NPL Assessment <br /> Consistent with Section 5.1 of the GWMP, Henderson proposes that NPLs for MLGW-15 be established <br /> using the agricultural use standards specified in CBSG Table 3 (refer to Appendix B) for dissolved iron, <br /> dissolved selenium and dissolved zinc. Data for conductivity and sulfate will be "report" only, as NPLs <br /> ' are not applicable for these parameters. The NPL range for pH was developed using ambient data as <br /> discussed in Section 3.4 below. The NPL for dissolved manganese was developed in accordance with <br /> I Establishing Background Threshold Values (BTV)for Manganese (Gateway Enterprises, 2012), included <br /> as Appendix H to the GWMP. Proposed NPLs for MLGW-15 are summarized in Table 3-2 below. <br /> Table 3-2: MLGW-15 Numeric Protection Limits <br /> ' Iron,dissolved 5 Table 3,CBSG <br /> Manganese,dissolved 0.79 Ambient <br /> Selenium,dissolved 0.02 Table 3,CBSG <br /> tZinc,dissolved 2 Table 3,CBSG <br /> Conductivity,umhos/cm NA(report) NA <br /> ' pH,s.u. 5.9—8.5 Ambient <br /> Sulfate,mg/L NA(report) NA <br /> Notes: <br /> Table 3,CBSG:Agricultural Use Standards <br /> Ambient:Dissolved manganese—refer to Establishing Background Threshold Values(BTV)for Manganese <br /> ' (Gateway Enterprises,2012);pH-see Appendix C <br /> 3.3 MLGW-17 <br /> 3.3.1 Monitoring Summary <br /> As required by the GWMP, baseline monitoring was performed at MLGW-17 over a period of <br /> five (5) calendar quarters from the 4th quarter of 2012 through the 4th quarter of 2013 for the <br /> parameters listed in GWMP Tables 4-1 and 4-2. <br /> Page 5 of 9 <br />