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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 <br />Units <br />MW -7 <br />Compliance' <br />MW -13 <br />Compliance' <br />Total Dissolved Solids (TDS) <br />m /L <br />3,918 <br />TBD <br />Sulfate SO4 <br />m /L <br />2,080 <br />TBD <br />Potassium K <br />m /L <br />17 <br />TBD <br />Sodium Na <br />m /L <br />226 <br />TBD <br />Iron Fe <br />m /L <br />4.5 <br />TBD <br />Manganese Mn <br />m /L <br />0.88 <br />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 />(VoerlBolducGd <br />Environmental Manager <br />