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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 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,r1p ' <br /> G( <br /> oel Bolduc ' <br /> Environmental Manager <br />