Laserfiche WebLink
Site SWGS-05 was added on the upstream end of Cottonwood Creek in 1993. Site SWGS-05 <br />and SWGS-02 are both upstream in Cottonwood Creek and are both above the projected angle <br />of draw of the mine workings. Monitoring of Site SWGS-05 ceased effective August 1999, and <br />monitoring of sites SWGS-01, SWGS-02 and SWGS-03 have been discontinued with the <br />approval of SL -8 and TR -67 in 2015. <br />Monitoring on Coal Creek and Jerry Creek was started in 1995. Discussions with DRMS <br />indicated that there was no need to monitor the upstream locations, SWGS 07 and 09. The flow <br />continued to be monitored at the lower monitoring points, SWGS 06 and 08. The locations are <br />shown on Exhibit 56. The ephemeral flow in Coal Canyon was measured at culverts located <br />between the two refuse disposal areas, SWGS 06. These culverts provided a stable cross <br />section and were 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 Highline <br />Canal, SWGS 08. Beginning July 1999, instantaneous flows were monitored monthly. Peak <br />flows were estimated from the flow marks in the culverts as well as chalk marks on the culverts <br />through 1999 when this monitoring was discontinued. All monitoring of site SWGS 08 ceased <br />effective September 2011 with the approval of TR -62 and monitoring of site SWGS 06 ceased <br />with the approval of SL -8 and TR -67 in 2015. <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 -67 18-3 Rev 11/15 <br />