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2.04.7 Hydrology Description <br />hole. The fractured rock is attributed to both the igneous Iron Point intrusion <br />and depth of cover. Similar drilling conditions are expected at potential <br />monitoring well site DH -68. <br />In summary, the Operator did not install down gradient monitoring wells <br />northeast of the Bowie No. 2 Mine east mine workings (east of Terror Creek) <br />because the wells were not economical or technically practical to install. The <br />rugged terrain limited potential drill sites. The only location where a <br />reasonable depth monitoring well could be constructed is in Hubbard Creek <br />but the UDSA -FS did not want the Hubbard Creek road re- opened. Opening <br />the Hubbard Creek road would be problematic because of public opposition, <br />road slope instability and potential flooding. <br />It is highly unlikely the public will use the deep bedrock groundwater located <br />northeast of the Bowie No. 2 Mine east mine workings (east of Terror Creek). <br />It is simply too expensive to install a domestic or livestock well at such <br />extreme depths. The poor water quality would also discourage public use. <br />The lack of deep bedrock groundwater monitoring data is somewhat <br />mitigated by the highly unlikely public use of the water. <br />Based on the above discussion, the Operator was granted relief from the <br />installation of a down gradient monitoring well for the northeastern mining <br />districts contemplated by PR -10, PR -11, and TR -65. <br />The western mining district, west of Terror Creek, has a down gradient <br />monitoring well located immediately west of Terror Creek (TC- 03- 01(B)) <br />which monitors the B -Seam. For the period of record from September 2003 <br />through June 2010, the average conductivity was 6,027 umhos /cm with a <br />range of 4,580 to 7,400 umhoslcm, the average ph was 11.8 with a range of <br />9.2 to 13.1, average total iron was 2.1 mg /I with a range of 0.05 to 21.5 mg /I <br />and average total manganese was 0.0593 mg /I with a range of below <br />detectable limits to 0.403 mg /l. Monitoring of TC- 03- 01(R), which monitors <br />the Rollins Sandstone has been discontinued based on the demonstration <br />that the Rollins Sandstone will not be impacted by mining in the west <br />expansion area west of Terror Creek (see pages 2.05 -122 and 123). This <br />well will remain open for future sampling at the time of bond release if <br />necessary. <br />PR -14 2.04-33- 03114 <br />