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Mr. R. Burgess <br />8/23/02 <br />Page 2 of 5 <br />Table 1 -Water quality constituents, standards and existing concentrations for Windy <br />Gulch <br />Constituent Agricultural Standard Average at Lower Weir"' <br />Aluminum (mg/I) None 0.36 <br />Arsenic (mg/1) 0.10 0.038 <br />Cadmium (mg/I) 0.010 0.017 <br />Copper (mg/I) 0.20 0.01 <br />Iron (mg/I) None 0.48 <br />Manganese (mg/I) 0.20 0.144 <br />Mercury (mg/I) None <0.0002 <br />Zinc (mg/I) 2.0 3.85 <br />pH (units) None 6.6 <br />Conductivity (mmhos/cm) None 371 <br />Total dissolved solids (mg/I) None 278 <br />Total suspended solids (mg/I) None 5 <br />Sulfate (mg/I) None I59 <br />t~] Average from 16 samples taken since 1998 <br />The proposed monitoring program in Windy Gulch will include the following elements <br />• For purposes of comparing against performance goals, surface water sampling will be <br />conducted at the existing Upper Weir along Bachelor Road and the existing Lower Weir <br />at the mouth of Windy Gulch. <br />• Water sampling will be conducted quarterly during the first, third and fourth quarters of <br />2003. During the second quarter (i.e., March to June, 2003) sampling will be conducted <br />monthly. <br />• Homestake, at its option, may also conduct sampling at additional locations in Windy <br />Gulch, but these locations will not be used to assess whether performance goals are being <br />met. <br />• The sampling program for the years 2004 to 2005 will be evaluated once the results from <br />the initial year (2003) are available. It is expected that quarterly sampling will be <br />conducted during these years, although Homestake may continue to conduct more <br />frequent sampling during the spring runoff period. <br />• Chemical analyses will be conducted for total concentrations of the constituents listed in <br />Table 1 above. <br />• The need for sampling beyond 2005 will be addressed based on the results from the first <br />three years. <br />Homestake agrees to compare measured water quality against the performance goals. However, <br />it should be recognized that attainment of performance goals might not be reached immediately <br />after the proposed reclamation activities in Windy Gulch are completed. Depending on <br />