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2.04.7 Hydrology Description <br />The monitoring data for well 2010-1 SS suggests that the well was initially <br />contaminated during construction, but has since reached an equilibrium state from <br />which future changes may be observed. For the period of record from March 2015 <br />through October 2015 for 2010-1 SS, the average field conductivity was 1,384 <br />umhos/cm with a range of 1,330 to 1,420 umhos/cm, the average field ph was 7.1 <br />with a range of 7.0 to 7.2, average total iron was 3.35 mg/I with a range of 2.47 to <br />4.94 mg/I and average total manganese was 0.116 mg/I with a range of 0.095 to <br />0.145 mg/I. <br />The data for well 2010-1 B suggests that the well was poorly constructed rendering <br />the water quality data invalid. Eliminating the first two monitoring events from the <br />historic data yields more consistent information with the high pH the most <br />questionable data. In well 2010-11B completed in the B -Seam, the average <br />conductivity is 2,900 umhos/cm with a range of 2,400 to 3,900 umhos/cm, the <br />average ph was 12.7 with a range of 12.5 to 12.9, average total iron was 0.32 mg/I <br />with a range of 0.18 to 0.63 mg/I and average manganese was 0.02 mg/I with a <br />range of <MDL to 0.02 mg/I for the period September 2012 to October 2013. After <br />the 2014 well rehabilitation work, 2010-1 B had the following water quality: pH 9.75 <br />su, conductivity 277 umhos/cm, total iron 4.31 mg/I, manganese 0.0621 mg/I. <br />For the period of record from October 2014 through October 2015 for 2010-1 B, the <br />average field conductivity was 761 umhos/cm with a range of 378 to 1,070 <br />umhos/cm, the average field ph was 10.0 with a range of 9.8 to 10.2, average total <br />iron was 2.53 mg/I with a range of 1.41 to 4.31 mg/I and average total manganese <br />was 0.0399 mg/I with a range of 0.0259 to 0.0621 mg/I. <br />The PR -13 mine plan areas, west of Terror Creek, has up gradient and down <br />gradient monitoring wells. CWI-DH-58 and CWI-DH-60 are up gradient monitoring <br />wells and 2010-1 B and 2010-1 SS are down gradient monitoring wells. See Map 9 <br />for well locations. Monitoring well CWI-DH-58 was replaced with CWI-DH-58A at the <br />end on 2014. <br />The Operator suspended mining on February 26, 2016. Mining through this date <br />was all within the PR -13 mine plan area. The Operator did not mine any of the coal <br />from the PR -14 Spruce Stomp mining area. Wells 2010-1 SS and 20110-1113 will be <br />down gradient and point of compliance wells for all mining completed though <br />February 26, 2016. <br />TR -99 2.04-36- 03/16 <br />