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W 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 MW-13 MW-13 MW-12 <br /> Existing Proposed Maximum3 Background <br /> Standards' Standards2 <br /> Total Dissolved Solids m /L 3,918 4,372 3,660 3,975 <br /> ' Sulfate SO4 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::j <br /> Manganese Mn m /L 0.88 0.69 1 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 /> Joel Bolduc <br /> ' Environmental Manager <br /> i <br /> 1 <br />