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rating curve; therefore, this calculated flow may to be high. The stream flow data appears to <br />indicate a good correlation between the upstream and downstream flows along Trout Creek. <br />To ensure the accuracy of the stream flow data, channel cross-sections at Site TR-a and TR-b are <br />surveyed annually to verify streambed stability. Figure 1 shows channel cross-sections that were <br />developed as part of an annual survey. These results confirm that the streambed configuration <br />has remained fairly constant and therefore verify streambed stability. <br />Irrigation ditch flow observations (flowing/not flowing and approximate flow) were made <br />monthly from April through September of 2009 at Site TR-A. Flow was observed in the <br />irrigation ditch at site TR-A during June of 2009. Instantaneous flow observations are provided <br />in Table 2. <br />3.2 NPDES Monitoring <br />' Monitoring of point discharges from sedimentation impoundments is accomplished under <br />Colorado Department of Public Health and Environment Colorado Permit Discharge System <br />Permit CO-0032638. Copies of required Discharge Monitoring Reports are provided to the <br />Colorado Division of Reclamation, Mining and Safety under separate cover, and are included in <br />this report by reference. <br />3.3 Surface Water Quality <br />Surface water sampling is performed in accordance with EPA approved methods and <br />instrumentation. As previously mentioned, the water quality along Trout Creek is monitored via <br />the parameters listed on Table 4.6-54, Section 4.6.8.4 of the permit. Tabular analyses results for <br />monitoring sites TR-A, TR-B, TR-C and TR-D are found in Tables 3, 4, 5 and 6. Results of the <br />analyses are discussed below. <br />3.3.1 Surface Water Temperature <br />Chart 2 shows temperature values for monitoring sites TR-A, TR-B, TR-C and TR-D for the <br />period of record. Temperature exhibited the same trends in 2009 as found during baseline <br />studies and previous years monitoring. Specifically, patterns in temperature are seasonal, <br />warming until July or August and than cooling throughout the remaining sampling season. <br />Surface water temperature for 2009 was colder than average for the period of record due to a <br />harsh winter and cool ambient temperatures. The lowest temperature in 2009 was recorded at <br />monitoring site TR-A in April with a reading of 4.8 °C and the high was recorded at monitoring <br />site TR-B in August with a reading of 17.0 °C. <br />???wW^ENGINEERING <br />Page 4