Laserfiche WebLink
BOWIE RESOURCES, LLC <br />Bowie No. 2 Mine <br />Coal Mine Waste Bank Nos. 1, 2 & 4 Inspections -3rd Quarter 2009 <br />On September 11, 2009, 1 performed a visual inspection of the Bowie No. 2 Mine coal mine <br />waste banks in accordance with Rule 4.10.2. This inspection includes Gob Pile Nos. 1, 2 and 4. <br />I, J. E. Stover, P.E., have a wide variety of experience in the design and construction of earth fill <br />embankments. Nothing was observed during the inspections that would indicate the piles have <br />a potential for failure. The gob disposal areas were damp to dry. All organic material and topsoil <br />has been removed ahead of the waste bank foundings. The upper diversion ditches were <br />inspected with no problems noted. <br />A significant amount of the gob pile no. 2 was covered with three feet of cover and one foot of <br />topsoil during the 4th quarter 2006. Most of the first and second benches were covered. Cover <br />material from gob pile no. 4 is stockpiled on the west side of pile no. 2. Cover material was <br />being removed from the east end of bench number two (pile no. 2) in order to facilitate <br />increasing the slope inclination from 5h:1 v to 3h:1 v. (TR-61) <br />Most of the coal mine waste was generated from the preparation plant. Approximately 64,000 <br />tons of gob were hauled to the gob piles. Coal mine v%aste is to be placed in the pile in <br />approximately horizontal lifts no more than 24-inches thick. The coal mine waste is spread and <br />compactive effort is provided by a self propelled sheepsfoot compactor. Thirty (30) compaction <br />tests were performed during the quarter. A test passes if the test attains at least 90% of the <br />maximum dry density attained in a laboratory compaction test in accordance with ASTM D698. <br />Three of the tests failed. Two of the areas where a test failed were reworked, retested and <br />passed. One test failed at the end of the quarter (#4444) and will have to be retested during the <br />fourth quarter. <br />A failure of the gob pile no. 1 would probably not be a hazard to human life. The pile is located <br />above a large flat bench. The bench is approximately 80 to 150-feet wide directly below the pile. <br />Additionally, the gob pile sediment pond is located belowthe pile. If the coal mine waste bank <br />failed, the material would very likely be contained on the bench below the pile and or within the <br />gob pile sediment pond. <br />A failure of the gob piles no. 2 and 4 would probably not be a hazard to human life. A residential <br />dwelling is located over 300-feet below pile no. 2. The piles are located above Bowie Road. A <br />failure of the piles might damage Bowie Road but would not likely impact the residential dwelling. <br />'pct the coal <br />certify that to the best of my knowledge and belief, that the fill and ot0 <br />6 OE <br />mine waste banks have been constructed as permitted in the desi .#h?? RMS. <br />g ra <br />aQ <br />?a <br />2 9 <br />James E. Sto%q ro ?.?oq o -.Date <br />Colorado Profe ibgal Engineer? <br />Registration No. woCoc <br />ooQ©a