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May Day Idaho Mine Complex 112 (d) Permit Application <br />18 • The Entrada Sandstone is not considered a significant aquifer in Colorado. <br />The conceptual model will be refined following further investigation. However, based on the available <br />information, the following activities will be undertaken for the protection of groundwater: <br />• The point of compliance will be the discharge from the No. 1 Idaho Adit, as this is discharging from <br />the Entrada Formation and is below the proposed level of tailings disposal; <br />• As this is a discharge to surface water, Chronic Aquatic Life Basic Standards will be used as the <br />performance criteria; <br />• Samples will be collected quarterly; <br />• In addition to the analytes presented in Attachment T-6, potassium will be used at the point of <br />compliance as surrogate parameter to provide an indication of potassium amyl xanthate as a possible <br />contaminant source. <br />• <br />• <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />18