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Surface Water Sampling, Idaho and Mayday Mine Permit Areas <br />a DG -1 up- stream of the Mayday Mine permit area; and <br />• DG -2 immediately down - stream of the Mayday Mine No. 2 permit area and adjacent to <br />the toe of an historical waste rock pile <br />At both locations, the channel was narrow and shallow. Flow readings were taken from the <br />approximate center of the channel, resting the flow meter on the bottom of the channel. Field <br />parameters (Table 1) indicate that the water is aerobic and circumneutral pH with low dissolved <br />salts. <br />1.3 Idaho Spring <br />The Idaho Spring is located west of Idaho Adit No. 1, expressing at the surface immediately <br />below the access road. At the Idaho Seep, the channel was narrow and shallow. Flow readings <br />were taken from the approximate center of the channel, resting the now meter on the bottom of <br />the channel. Field parameters (Table 1) indicate that the water is aerobic and circumneutral pH <br />with low dissolved salts. <br />2.0 Analytical Results <br />Analytical results are presented in Tables 2 to 4. Analytical reports are presented in Attachment <br />A. <br />General surface water chemistry are presented in Table 2. Sulfate concentrations above the <br />reporting limit were recording at all locations. The highest concentration was recorded at the <br />Idaho Seep, however there was no increase concentration reported downstream of the seep in the <br />La Plata River at sample location SW -2. <br />Dissolved metal analytical results are presented in Table 3. There were no exceedences of either <br />Acute of Chronic Aquatic Life Standards. <br />Total metal analytical results are presented in Table 4. Total Recoverable Aluminum <br />concentrations above the Chronic Life Standard in SW -2 collected from the La Plata River <br />downgradient of all permit areas and DG -2 collected immediately below the Mayday #2 Portal <br />was reported. Regulation 31— The Basic Standards and Methodologies for Surface Water were <br />amended on 8/9/2010 to become effective 1/1/2011 and incorporated a hardness -based criterion <br />for Total Recoverable Aluminum where surface water pH values are greater than 7.0. This <br />equation was used to re- calculate values for Chronic Life Standard for Total Recoverable <br />Aluminum (Table 5). The concentration of Total Recoverable Aluminum reported for sample <br />SW -2 collected during the 2 nd Quarter 2010 remained above the re- calculated Chronic Life <br />Standard. <br />A duplicate sample was collected at sample point SW -1. The relative percent difference for all <br />analytes were below 20% and are considered acceptable (Attachment B). <br />• <br />September 7, 2010 R Z Incorporated <br />