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• <br />Site SWGS-05 was added on the upstream end of Cottonwood Creek in <br />1993. Site SWGS-05 and SWGS-02 are both upstream in Cottonwood Creek and <br />are both above the projected angle of draw of the mine workings. Therefore <br />monitoring of these sites is redundant. Monitoring of Site SWGS-05 will cease <br />effective August 1999. <br />Monitoring on Coal Creek and Jerry Creek was started in 1995. Discussions <br />• <br />with DMG have indicated that there is no need to monitor the upstream locations <br />SWGS 07 and 09. The flow will only be monitored at the lower monitoring points. <br />The locations are shown on Exhibit 56. The ephemeral flow in Coal Creek will be <br />measured at culverts located between the two refuse disposal areas, SWGS 06. <br />These culverts provide a stable cross section and are accessible throughout the <br />year. A rating chart for the culverts is shown on Table 18-6. The intermittent flow <br />in Jerry Creek will be measured at the culvert near the Highline Canal, SWGS 08. <br />Beginning July 1999, instantaneous flows will be monitored quarterly. Peak flows <br />will be estimated from the flow marks in the culverts as well as chalk marks on the <br />culverts. <br />In March or April of each year, the springs and seeps described in the <br />hydrologic section of this permit application will be monitored. Monitoring will <br />consist of flow and field measurements (pH, conductivity, and temperatures). <br />Results of monitoring will be included in the annual hydrologic report. <br /> <br />VOL 5 Tab 18 <br />18-3 <br />8/18!99 <br />