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Mr. Berhan Keffelew <br />7/7/2010 <br />Page 2 of 2 <br />Existing and proposed standards are shown in the table below. <br />TABLE 1 - EXISTING AND PROPOSED STANDARDS <br />Parameter Units MW-7 <br />Existing <br />Standards' MW-13 <br />Proposed <br />Standards2 MW-13 <br />Maximums MW-12 <br />Background4 <br />Total Dissolved Solids m /L 3,918 4,372 3,660 3,975 <br />Sulfate S04 m /L 2,080 2,585 2,000 2,350 <br />Potassium K m /L 17 17 12 12 <br />Sodium Na m /L 226 274 249 171 <br />Iron Fe m /L 4.5 0.19 0.11 0.17 <br />Manganese Mn m /L 0.88 0.69 0.26 0.63 <br />' MW-7 Standards set based on nine rounds of historical sampling, standards approved in 2009. <br />2 MW-13 Proposed Standards are 110% of the Maximum value obtained during 2009-2010 <br />testing or 110% of the average of the background well, whichever is greater. <br />3 MW-13 Maximum is the maximum result obtained during five quarters of testing 2009-2010. <br />4 MW-12 Background is the average of the results obtained in 2009 and 2010. <br />If you have any questions, please do not hesitate to call me at (719) 288-1427. <br />Sincerely, <br />P "U.V, <br />Joel Bolduc <br />Environmental Manager