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2012-03-12_REPORT - C1982056 (2)
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2012-03-12_REPORT - C1982056 (2)
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Last modified
8/24/2016 4:55:04 PM
Creation date
3/12/2012 10:47:19 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
3/12/2012
Doc Name
2011 Annual Hydrology Report (1 of 2)
From
Twentymile Coal Company
To
DRMS
Annual Report Year
2011
Permit Index Doc Type
Hydrology Report
Email Name
JDM
DIH
Media Type
D
Archive
No
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Middle Creek Alluvial Groundwater: TC has no active Middle creek alluvial wells. Two Middle Creek <br />alluvial wells (AVM -1 and AVM -2) were incorporated into the monitoring network during 1996, however, per <br />TR03 -42, these wells were abandoned in the Fall of 2003. Refer to previous AHRs for earlier data. <br />3.21 Points of Compliance <br />Rule 4.05.13(1)(b) requires formal establishment of ground water points of compliance for coal operation which <br />has the potential for negatively impacting the quality of ground water for which quality standards have been <br />established by the Colorado Water Quality Control Commission. The Commission's Rule 41 sets forth Basic <br />Standards for ground Water. These Standards are applicable to ground water at the Foidel Creek Mine. In the <br />judgment of DRMS, these Standards are applicable to ground water at the Foidel Creek Mine, however it is also <br />the judgment of DRMS, the Foidel Creek Mine does not have the potential to negatively impact bedrock aquifers <br />due to the nature of the geology (i.e. synclinal basin) found at the mine's location. <br />Wells 008 -AV -2 (Foidel Creek alluvium), 008 -AU -3 (Fish Creek alluvium), and well 008 -AT -1 (Trout Creek <br />alluvium) will satisfy the requirements for alluvial ground water points of compliance. <br />3.3 Surface Water Monitoring <br />Monitoring /Sampling Requirements: Table 32 presents a summary of surface water monitoring frequencies, <br />which was last updated for Permit Revision 6 (PR 03 -06 Exhibits 14 -7 through 14 -10) in March of 2004. Site <br />locations are shown on Figure 2 (a.k.a. Map 13A), Hydrologic Monitoring Plan of TR03 -42 (as well as in Figure <br />2 of this AHR). Table A of Exhibit 14 specifies three seasonal monitoring episodes (i.e. October to February, <br />March to May, and June to September), each of which are further divided into two general categories of sampling <br />frequency: 1) "Regular" monitoring that is done continuously, and 2) "Contingent" monitoring that is conducted <br />only when there is a discharge from underground mine pumping at surface discharge sites 109 and/or 115. Note <br />that discharge from site 109 has not occurred in several years, and is not anticipated to occur in the future. <br />2011 surface water data is provided in Tables 33 through 49. Water quality parameters for these sites were <br />typically within previously established ranges, unless otherwise discussed below. An historical summary of data <br />has been provided in Tables 35a through 5la. <br />Stream Gaging <br />Accurately monitoring flow at stream sites can be difficult due to continual damage of gage stations by cows, <br />horses, and weather effects. Stations require repair on a regular basis. 2011 was no different. Record snow melt <br />and creek flooding washed out many gage stations and prevented vehicle access during the spring high water <br />flows. In addition, erosion of stream channel banks impact flow calculations. In the summer of 2007, TC hired <br />consultants (Rivers Unlimited, Inc. of Steamboat Springs, and Norwest Applied Hydrology of Denver) to assist <br />with re- evaluating key stream bed locations, including rating curves for ongoing stream gauging. This on -going <br />study continued into the spring summer and fall of 2011. Gage calculations for 2011 are attached as an appendix <br />10 <br />
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