2013-02-13_REPORT - C1981041 (2)

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2012 AHR Page 3 same date, the maximum increase in the River's TDS as a result of mine discharge would have been 0.18 %. This Year's mean daily flow values for the Cottonwood and Rapid Creek flumes are included on data pages SG -53, SH -27, and SI -27. Flow at SWGS -01 is presented graphically on data page SG -54. At site SWGS -01, the clock mechanism stopped working 11/16/11 through 11/29/11. As usual, the flow in these Creeks is largely controlled by the City of Palisade, depending upon their need for domestic water. Also, irrigation water is diverted from the creeks by private water right holders at various locations. Table S12 -1 was prepared to show the average monthly flows during the primary irrigation season when low flow in the creeks is critical. Gaps in information are explained above. Minimum recording levels of the flumes are listed at the bottom of Table S12 -1. Monitoring on Coal Creek and Jerry Creek was started in 1995. The crest stage gages installed in Coal Canyon drainage and Jerry Creek in 1996 were destroyed by a storm in the summer of 1998. Discussions with DRMS have indicated there is no need to monitor the upstream locations SWGS 07 and 09. The creeks will only be monitored at the lower monitoring points. The ephemeral flow in Coal Creek is measured at culverts located between the two refuse disposal areas, SWGS 06. These culverts provide a stable cross section and are accessible throughout the year. The intermittent flow in Jerry Creek is measured at the culvert near the Highline Canal, SWGS 08. Beginning July 1999, instantaneous flows are to be monitored monthly. Data taken during the Year are listed on data pages SR -3 for Coal Canyon and SS -3 for Jerry Creek. Monitoring was suspended for Jerry Creek (SWGS 08) with the approval of TR62 on 11/8/11. There were four seeps included in the hydrologic monitoring in 1995. The locations of the seeps are shown on the Hydrologic Monitoring Map. They are located adjacent to Coal Canyon drainage and Jerry Creek. They are primarily evident by the white staining on the hillsides from evaporation of the seeps. None of them flow to the creek channel but generally evaporate within a couple of hundred feet of the source. On April 19, 2006, Snowcap Coal Company submitted a technical revision, TR50, requesting to discontinue seep monitoring. The request was approved by the Division on July 25, 2006. Therefore, no monitoring was performed during the Year. There was no discharge from CDPS discharge points 005 thru 015 during the Year. These outfalls cover sediment pond discharges. Discharge point 015, now inactive, was permitted to allow pumping water from the south end of the Roadside South Portal out the 2 West portals. Discharge point 016 is permitted for gravity discharge from the northwest intake pool. It replaced outfalls 001 and 002 on March 31, 2002. Discharge point 001 was primarily used as an overflow to a mine water system for the preparation plant during mine operations. During March and April 2000, a discharge pipe was installed from the No.2 South Mains sump to outfall 001. The routing of this 4 -inch diameter