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Addressee Name <br />Date <br />Page 3 <br />field were not properly calibrated. OMLLC should ensure that meters are properly <br />calibrated prior to future sampling events, and that meters are calculated for the <br />anticipated pH and conductivity levels at each site. <br />7. Monitoring results are generally in line with the predicted impacts to the hydrologic <br />balance loosely described in Section 2.05 of the permit application package, including <br />"changes in surface water chemistry ", "increases in the levels of TDS, TSS, and certain <br />individual chemical constituents" in surface water, "drainage of seeps /spri ngs ", and <br />"increases in concentrations of TDS and certain individual chemical constituents" in <br />groundwater. Nonetheless, OMLLC needs to revise the 2011 AHR to include a <br />discussion, under Rule 4.05.13(4)(c) of how the monitoring results to date compare with <br />the predicted impacts to the hydrologic balance presented in the permit application <br />package. <br />If you have any questions, please contact me at (303) 866 -3567. <br />Sincerely, <br />Brock Bowles <br />Environmental Protection Specialist <br />