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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 <br />Units <br />MW -7 <br />Existing <br />Standards' <br />MW -13 <br />Proposed <br />Standards2 <br />MW -13 <br />Maximum3 <br />MW -12 <br />Background <br />Total Dissolved Solids <br />m /L <br />3,918 <br />4,372 <br />3,660 <br />3,975 <br />Sulfate SO4 <br />m /L <br />2,080 <br />2,585 <br />2,000 <br />2,350 <br />Potassium K <br />m /L <br />17 <br />17 <br />12 <br />12 <br />Sodium Na <br />m /L <br />226 <br />274 <br />249 <br />171 <br />Iron Fe <br />m /L <br />4.5 <br />0.19 <br />0.11 <br />0.17 <br />Manganese Mn <br />m /L <br />0.88 <br />0.69 <br />0.26 <br />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 />" 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 />Joel Bolduc <br />Environmental Manager <br />