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and downstream flows along Trout Creek. <br />To ensure the accuracy of the stream flow data, channel cross-sections at Site TR-a <br />and TR-b are surveyed annually to verify streambed stability. Figure 1 shows channel cross- <br />sections that were developed as part of an annual survey. These results confirm that the <br />streambed configuration has remained fairly constant and therefore verify streambed stability. <br />Irrigation ditch flow observations (flowing/not flowing and approximate flow) were <br />made monthly from April through October of 2007 at Site TR-A. Flow was observed in the <br />irrigation ditch at site TR-A during June and July of 2007. Instantaneous flow observations <br />are provided in Table 2. <br />3.2 NPDES Monitoring <br />Monitoring of point discharges 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 />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 <br />via the parameters listed on Table 4.6-54, Section 4.6.8.4 of the permit. Tabular analyses <br />results for monitoring sites TR-A, TR-B, TR-C and TR-D are found in Tables 3, 4, 5 and 6. <br />Results of the 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 <br />for the period of record. Temperature exhibited the same trends in 2007 as found during <br />baseline studies and previous years monitoring. Specifically, patterns in temperature are <br />seasonal, warming until July or August and than cooling throughout the remaining sampling <br />season. The lowest temperature in 2007 was recorded at monitoring site TR-A in May with a <br />reading of 3.9 °C and the high was recorded at monitoring site TR-D in July with a reading of <br />23.5 °C. <br />3.3.2 Surface Water pH <br />Chart 3 shows pH concentrations for monitoring sites TR-A, TR-B, TR-C and TR-D <br />for the period of record. Values of pH during 2007 remained more static than most years <br />during baseline studies and previous monitoring. There is no apparent trend regarding pH <br />although only slight variations occur during the monitoring season. Overall, Trout Creek has <br />remained alkaline throughout the period of record. The lowest pH value in 2007 was recorded <br />3 <br />