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- Thickener/Underflow from Wa5hplant <br />Casing - Nominal 10" to 14" <br /> <br /> C! ? <br /> M <br />n <br />n ? <br /> <br />X13 C3? CD <br /> <br /> <br />GRT <br />Underground Workings <br />Borehole Drilled to 12-3/4" to 14-3/4" <br />Nominal 10" to 14" Conductor Casing Installed and Fully Grouted To Drilled <br />Conductor Casing Augered or Drilled to Maximum 80' Depth <br />Borehole Casing - 8-5/8" OD <br />Reamed to Nominal 1 1", Possible Multiple Passes <br />8-5/8" OD Casing Installed and Fully Grouted <br />To I O' Above Surveyed Mine Roof <br />I I " Borehole Drilled to 10' Above Surveyed Mine Roof <br />final 10' of Borehole Reamed to Nominal 7-7/8" <br />Not to Scale <br />LEGEND <br />1=1 I soil <br />o Water <br />Grout <br />Old Mine Workings <br />Not to Scale <br />REVISED DATE: 10/07/09 <br />TWENTYM I LE COAL CO. <br />FOIDEL CREEK MINE <br />6RT THICKENER BOREHOLE <br />M5HA SUBMITTAL <br />ROUTTCOUNTY, COLORAD <br />DRAWN BY O <br />NVECJV5rZ Not to scale <br />G:Viicxne ,4G Rt 0Qb/ TI"Gav Ln 4 BMM5MA 5ubmfa"Drav,AGU PaoM"n-Wd-