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2.04.7 Hydrology Description <br />CWI -DH -58 and CWI- DH -60, installed by the Bowie No. 1 Mine, are up gradient <br />monitoring wells for the west mining district installed by the Bowie No. 1 Mine. <br />Completion diagrams for the two wells are included in Volume III, Exhibit 3. <br />CWI -DH -60 was perforated at six different intervals with the top perforation being the <br />upper B -Seam. The well was monitored for depth to water from July 21, 1983 until <br />October 04, 1990. Generally the water depth was about 1,000 feet which is slightly <br />above the upper B -Seam. One mixed aquifer water quality sample was obtained on <br />August 22, 1983. Conductivity was 7,560 umhos /cm, ph was not available, total iron <br />was 0.58 mg /I and manganese was 0.09 mg /I. The Applicant cemented CDW -DH- <br />60 from the bottom of the well to the bottom of the B -Seam in September 2010. <br />Based on monitoring after the cement job, the B -Seam is dry at this location. <br />Beginning in 2011 the field technician has not been able to get monitoring equipment <br />down to the water level. Monitoring well CWI -DH -60 was cleaned and rehabilitated <br />between August 20 and August 23, 2014. On August 22, 2014, the well was <br />evacuated using the airlift and bailing techniques and the water quality showed a pH <br />of 7.70 s.u., conductivity of 863 pS /cm, and temperature of 20.5° C. After a 12 hour <br />recovery period, the SWL was measured at 892.0 feet btoc (August 23, 2014). <br />CWI -DH -58 was perforated at eight different intervals with the second from the top <br />perforation being the upper B -Seam. CWI -DH -58 was monitored from January, <br />1983 though October 11, 1990. The hole was reported as being dry during the <br />period of record. The Applicant removed tubing from the well during August 2010 so <br />it could confirm prior monitoring data. The Applicant confirmed CWI -DH -58 was dry <br />to a level below the B -Seam. Beginning in 2011 the field technician has not been <br />able to get monitoring equipment down to the water level. During August 2014 the <br />Applicant was not successful in rehabilitating CWI- DH -58. Therefore, a replacement <br />well CWI- DH -58a drilled and completed in December 2014. <br />The Applicant installed two monitoring wells in 2011 to provide down gradient <br />monitoring for the western mining district west of Terror Creek. One monitoring well <br />(2010 -1 B) is completed in the B -Seam with a screened interval of 1,190 to 1,220 <br />feet. The second monitoring well (2010 -1 SS) is completed in a sandstone water <br />bearing zone located above the B -Seam with a screened interval of 1,120 to 1,140 <br />feet. This sandstone water bearing zone above the B -Seam was identified at wells <br />TC -03 -02 and TC- 03 -03. <br />MR -172 2.04-35- 01/15 <br />