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Bill Bear <br />Page 2 of 2 <br />1/31/2018 <br />instability, structural weakness or hazardous conditions at the piles. The observations made by <br />J.E. Stover and Associates reflect the observations made by the Division during on-site <br />inspections. There was no waste coal placed on Gob Pile #2 during the 4`h quarter. Work was <br />being conducted at the west drying pile at Gob Pile #3. Material was removed from the west <br />drying area and placed on top of pile #3. The material was then returned to the drying area and <br />compacted. During the 41h quarter no compaction tests were performed on the gob pile #2 or <br />Gob Pile #3. The following is a discussion of data from the Huddleston -Bent' Engineering and <br />Testing, LLC (HBET) reports on Gob Pile Numbers 2 and 3 included with the quarterly <br />monitoring report. There are three inclinometers installed in the lowermost bench of Gob Pile <br />#2. Measurements of these inclinometers are taken quarterly. The 4" quarter results indicate <br />that no significant movement occurred. There are 5 vibrating wire piezometers (VWP) installed <br />at Gob Pile #2 and 5 installed at Gob Pile #3. The reports indicate that there has only been minor <br />fluctuations in the values recorded from the VWPs. The minor fluctuations are not believed to <br />affect the stability of either Gob Pile #2 or #3. The reports noted that there are no indications of <br />instability at the gob piles. <br />A Ietter sent to Bowie Resources, LLC (BRL) on April 10, 2014 from the Division directed BRL <br />to increase the monitoring frequency from quarterly to monthly. In a letter dated April 11, 2014, <br />BRL committed to increasing the monitoring frequency. Monthly monitoring was conducted <br />through October of 2014 and an additional quarterly reading was taken on January 6, 2015. On <br />February 10, 2015 the Division approved BRL to monitor once per quarter through the I" quarter <br />of 2016. The Division will continue to review the quarterly data and determine if BRL should <br />return to monthly monitoring of VWP-06 and VWP-08. <br />This concludes the Division's review of the 0 Quarter 2017 Pond Inspection Report and the 4th <br />Quarter 2017 Coal Waste Pile & Instrument Monitoring Report. If you have any questions, feel <br />free to contact me. <br />Sincerely, <br />, 9A, a � � - g/,&/ <br />Clayton Wein <br />Environmental Protection Specialist <br />clayton.wein@state.co.us <br />oF' otp <br />I �e <br />555 Street Address, Room 555, Denver, Co 55555-5555 P 555.555.5555 <br />* 4 <br />}1876{ <br />