Laserfiche WebLink
BOWIE RESOURCES LIMITED <br />Bowie No. 2 Mine <br />Old Coal Mine Waste Bank Inspection - 3`d Quarter 2004 <br />On September 29, 2004 I performed the required quarterly visual inspection of the Bowie <br />No. 2 Mine coal mine waste bank in accordance with Rule 4.10.2. <br />I, J. E. Stover, P.E., have a wide variety of experience in the design and construction of <br />earth fill embankments. Nothing was observed during the inspection that would indicate <br />the pile has a potential for failure. The gob disposal area was dry to damp. All organic <br />material and topsoil has been removed ahead of the waste bank founding. The upper <br />diversion ditch was inspected and the Operator was advised that some ditch clean out was <br />required. The Operator subsequently notified the undersigned that the ditch maintenance <br />has been performed. <br />The construction of the pile has progressed above the fourth terrace (6130'). The out <br />slopes of the lower three terraces have been covered. The depth of cover has not been <br />verified. <br />Most of the coal mine waste was generated from the preparation plant. Approximately <br />500 tons of gob were hauled to the gob pile. Coal mine waste is to be placed in the pile in <br />approximately horizontal lifts no more than 24-inches thick. The coal mine waste is <br />spread and compactive effort is provided by a self propelled sheepsfoot compactor or a <br />front-end loader. A total of 5 tests were taken on the pile. One test failed on August 24"' <br />Where the compaction test failed, the pile was re-compacted and a new compaction test <br />was taken on September 9"'. The re-tested area passed. A test passes if the test attains <br />at least 90% of the maximum dry density attained in a laboratory compaction test in <br />accordance with ASTM D698. Relative compaction test results are enclosed. <br />A failure of the pile 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 <br />the pile. Additionally, the gob pile sediment pond is located below the pile. If the coal <br />mine waste bank failed, the material would very likely be contain~d~pQonch below <br />the ile and or within the ob ile sediment ond. o®P~°°°°°°°° r ° <br />P~ 9 P~ P oo~,°° E. ST°F9~® <br />o~ `S o,, o <br />10 u °~ ~~, a 4 <br />V sQ ~^ a <br />/~~ i_ _ 19230 ; ,~a~~/o <br />P.E. No. 1 <br />0 <br />