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NPDES MONITORING <br />Monitoring of point dischazges from sedimentation impoundments is accomplished <br />under Colorado Department of Public Health and Environment Colorado Permit Discharge <br />System Permit CO-0032638. Copies of required Discharge Monitoring Reports are provided <br />to the Division of Minerals and Geology under separate cover, and are included in this report <br />by reference. <br />SURFACE WATER QUALITY <br />As previously mentioned, the water quality along Trout Creek is monitored via the <br />pazameters listed on Table 4.6-54, Section 4.6.8.4 of the permit. Concentrations of the <br />analyzed parameters aze provided in tabular format in Appendix A. Results of the analyses <br />are discussed below. <br />Temperature and pH <br />Temperature (Figure 2) and pH (Figure 3) exhibited the same trends in 2006 as found <br />during baseline studies and previous years monitoring. Specifically, patterns in temperature <br />are seasonal, warming until July or August and than cooling throughout the remaining <br />~ sampling season. There is no apparent trend regarding pH although only slight variations <br />' occur during the monitoring season. Overall, Trout Creek has remained alkaline throughout <br />the period of record. Temperature and pH concentrations aze provided in tabular format in <br />' Appendix A. <br />5 <br />