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Parameter <br />Units <br />MW -7 <br />Existing <br />Standards' <br />MW -13 <br />Proposed <br />Standards <br />MW -13 <br />Maximum <br />MW -12 <br />Background <br />Total Dissolved Solids <br />mg /L <br />3918 <br />4026 <br />3660 <br />3975 <br />Sulfate (SO4) <br />mg /L <br />2080 <br />2350 <br />2000 <br />2350 <br />Potassium (K) <br />mg /L <br />17 <br />16.9 <br />11.9 <br />16.9 <br />Sodium (Na) <br />mg /L <br />226 <br />274 <br />249 <br />171 <br />Iron (Fe) <br />mg /L <br />4.5 <br />0.17 <br />0.11 <br />0.17 <br />Manganese (Mn) <br />mg /L <br />0.88 <br />0.63 <br />0.26 <br />0.63 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Mr. Berhan Keffelew <br />7/7/2010 <br />Page 2 of 2 <br />Existing and proposed standards are shown in the table below. <br />Sincerely, <br />Joel Bolduc <br />Environmental Manager <br />TABLE 1 — EXISTING AND PROPOSED STANDARDS <br />1 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 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 />