REV03228 - Laserfiche WebLink

Home Browse Search

backhoe and it will be stored on the edge of the site. A reserve pit shall be dug using a backhoe. The reserve pit shall be approximately 20 feet X 10 feet and 8 feet deep. The acreage disturbed for the drill site will be approximately .23 acre and the access road .07 acres. The site will be occupied by drilling equipment for approximately 7- l Odays. OS-LW32 This site is located in a previously disturbed flat area immediately north of the North A-pit road. The drill site shall be approximately 100 feet squaze. A reserve pit shall be dug using a backhoe. The reserve pit shall be approximately 20 feet X 10 feet and 8 feet deep. No new acreage will be disturbed with this drill site. The site will be occupied by drilling equipment for approximately 7-10 days. 5. Describe Exploration Activities: At each of the drill sites described above, the topsoil, if present, will be removed using a backhoe blade and stockpiled at the end of the drill location. Drilling equipment that will be moved onto the site will be atruck-mounted drill rig, pipe trailer, water truck, supplytrailer/dog-house, and two pick-up trucks. The upper reaches of the hole shall be drilled to an approximate diameter of 10 inches to a depth that intersects bedrock (this includes drilling through spoil piles that may exist). Steel casing will then be inserted into the hole to stabilize the surface material. The hole will then be drilled using rotary methods to a depth approximately 20 feet above the coal seam of interest. At that point, core drilling will commence to retrieve core samples of the seams roof rock, coal seam and floor rock. The hole will be drilled to a point approximately 50 feet below the lowest mineable coal seam. After completion of the drilling the hole will be geophysically logged using truck-mounted equipment. During the drilling process, all drilling fluids shall be contained in the reserve pit. After drilling and logging has been completed, the drill holes shall be abandoned in accordance with Colorado State well abandonment procedures. This will include the filling of the hole with approved well abandonment material to a point 10 feet below the land surface. A cement plug will then be placed in the hole above the well abandonment material to the surface. A steel mazker will be placed in the top ofthe cement plug. After the reserve pit has been back-filled, topsoil (if present) shall be spread back over the site and the soil along the access corridor shall be raked with a tractor pulled rake and the ground reseeded using the attached mixture and rate of seed. One exception to the well abandonment procedure is that at three or more of the holes, it is the intent to develop them into permanent groundwater monitoring well. The determination of which sites will be developed cannot be made at this time but will be dependent on the conditions discovered when drilling the holes. This will be