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Colowyo Coal Company <br />2012 Annual Reclamation and Hydrology Report <br />SECTION 2 - SURFACE AND GROUND WATER DATA <br />RULE REQUIREMENT <br />RULE 4.05.13(4)(c) Monitoring Report Requirements (surface and ground water) <br />Rule 4.05.13(4)(c) <br />(i) Water quality data for the four surface monitoring sites is presented in Exhibit 2A of <br />this report. <br />(ii) Water quality data obtained from the three surface and six ground water sites is <br />presented in Exhibit 2A and 2B of this report. Discharge monitoring reports are <br />submitted to the Colorado Department of Public Health and Environment on a quarterly <br />basis. A copy is forwarded to the CDRMS and is included in this report by reference. <br />(iii) A written interpretation of the data is not required by the Division. <br />All analytical results from surface and ground water monitoring have been tabulated and <br />are kept on file at Colowyo Coal Company L.P. Historical data is presented in this AHR. <br />The monitoring timeframe for this annual report is from January 1, 2012 through <br />December 31, 2012. A description of the surface and ground water monitoring plan is <br />located in Colowyo's CDRMS Permit, Volume 1, Section 4.05.13 of the permit. <br />GENERAL DISCUSSION <br />Surface Water Data - Surface water monitoring sites comprise two upstream and two <br />downstream sites and are briefly described below (See Exhibit 2C for location). Surface <br />water monitoring changed from monthly to quarterly in July of 2008, due to the approval <br />of PR -02: <br />• New Upper Good Springs Creek (NUGSC) — upstream site, located south of the <br />mine along Moffat County State Highway 13 and represented on the Surface & <br />Ground Water Sampling Sites Map located in Exhibit 2C. Monitoring has <br />occurred from 1992 to 2012. <br />• Lower Good Spring Creek (LGSC) — downstream site, located below active <br />mining conditions along Moffat County State Highway 13 and represented on the <br />Surface & Ground Water Sampling Sites Map located in Exhibit 2C. Monitoring <br />has occurred from 1982 to 2012. <br />• Lower Taylor Creek (LTC) — downstream site, located below active mining <br />conditions along Moffat County Road 17 and represented on the Surface & <br />Ground Water Sampling Sites Map located in Exhibit 2C. Monitoring has <br />occurred from 1983 to 2012. <br />Page 2 -1 <br />