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Site SWGS -05 was added on the upstream end of Cottonwood Creek in 1993. Site <br />SWGS -05 and SWGS -02 are both upstream in Cottonwood Creek and are both above the <br />projected angle of draw of the mine workings. Therefore monitoring of theses sites is <br />redundant. Monitoring of Site SWGS -05 ceased effective August 1999. <br />Monitoring on Coal Creek and Jerry Creek was started in 1995. Discussions with DMG <br />have indicated that there is no need to monitor the upstream locations SWGS 07 and 09. <br />The flow will only be monitored at the lower monitoring points. The locations are shown <br />on Exhibit 56. The ephemeral flow in Coal Canyon will be measured at culverts located <br />between the two refuse disposal areas, SWGS 06. These culverts provide a stable cross <br />section and are accessible throughout the year. A rating chart for the culverts is shown on <br />Table 18 -6. The intermittent flow in Jerry Creek was measured at the culvert near the <br />Highline Canal, SWGS 08. Beginning July 1999, instantaneous flows were monitored <br />monthly. Peak flows were estimated from the flow marks in the culverts as well as chalk <br />marks on the culverts through 1999 when this monitoring was discontinued. All monitoring <br />of site SWGS08 ceased effective September 2011 with the approval of TR -62. <br />The annual monitoring of the springs and seeps described in the hydrologic section of this <br />permit application was initiated in 1995 and discontinued effective 2006. <br />TR -62 18 -3 Rev 07/11 <br />