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May Day Idaho Mine Complex 112 (d) Permit Application <br />• Recreation P <br />• Water Supply <br />• Agriculture <br />(b) Surface Water Quality Data <br />Surface water quality samples for four twe quarters have been collected from five <br />locations as described in Attachment T-5. The Division has agreed that a 112(d) permit <br />may be issued, if all of the requirements of the Act are met, prior to completion of five <br />successive calendar quarters of surface water sampling, with appropriate limitations on <br />mining activities which might potentially impact surface water pending completion of all <br />five quarters of sampling. The following is a summary of analytical results to date: <br />• Sulfate concentrations above the reporting limit were recording at all locations. <br />The highest sulfate concentration was recorded for the sample collected from the <br />discharge at the Idaho No. 1 Portal, however there was no increase concentration <br />reported downstream of the seep in the La Plata River; <br />• There were no exceedances of either Acute of Chronic Aquatic Life Standards <br />for dissolved metals. <br />• Total Recoverable Aluminum concentrations above the Chronic Life Standard <br />was reported for samples collected from the La Plata River down gradient of all <br />permit areas and within Little Deadwood Gulch immediately below the May Day <br />No. 2 Operational Area. Regulation 31- The Basic Standards and <br />Methodologies for Surface Water were amended on 8/9/2010 to become effective <br />1/1/2011 and incorporated a hardness-based criterion for Total Recoverable <br />Aluminum where surface water pH values are greater than 7.0. This equation <br />was used to re-calculate values for Chronic Life Standard for Total Recoverable <br />Aluminum. The concentration of Total Recoverable Aluminum reported <br />downstream of the operations collected during the 2nd Quarter 2010 remained <br />above the re-calculated Chronic Life Standard following recalculation. <br />(c) Analytical Detection Limits <br />A comparison of analytical detection limits with Surface Water Standards is presented in <br />Attachment T-6. All detection limits are below applicable standards. <br />6.4.20(12) Water Quality Monitoring Plan <br />Wildcat Mining Corporation has revised the surface and groundwater analyte list <br />pursuant to DRMS request and CDPHE water quality criteria. The changes in <br />analytes and procedures include: <br />• Dissolved aluminum and iron <br />• Molybdenum-total recoverable <br />• Cyanide (free cyanide or WAD) <br />REVISED June 5, 2011 <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />13 <br />