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Mr.Berhan Keffelew <br /> 2/17/2009 <br /> Page 2 of 2 <br /> Holcim proposes monitoring for the following parameters: <br /> • Total Dissolved Solids (TDS) <br /> • Sulfate (SO4) <br /> • Potassium (K) <br /> • Sodium (Na) <br /> • Iron (Fe) <br /> • Manganese (Mn) <br /> In addition, the following field parameters will be recorded. <br /> • pH <br /> • specific conductance <br /> • temperature <br /> Proposed standards are shown in table below. <br /> TABLE 1 — PROPOSED STANDARDS <br /> Parameter Units MW-7 MW-13 <br /> Compliance' Compliance <br /> Total Dissolved Solids TDS m /L 3,918 TBD <br /> Sulfate SO4 m /L 2,080 TBD <br /> Potassium K m /L 17 TBD <br /> Sodium Na m /L 226 TBD <br /> Iron Fe m /L 4.5 =TBD <br /> Manganese Mn m /L 0.88 1 TBD <br /> MW-7 Standards set based on nine (9) rounds of historical sampling. <br /> 2 MW-13 Standards will be set based on sampling to be conducted in 2009-2010. <br /> If you have any questions, please do not hesitate to call me at (719) 784-1118. <br /> Sincerely, <br /> Joel Bolduc <br /> Environmental Manager <br />