Laserfiche WebLink
Doc Date:1 211 112 0 0 1 <br />III IIIIIIIIIIIIIIII <br />1997 GEOTECHNICAL DRILLING PROGRAM (MR#210) <br />SYLVESTER GULCH FACILITIES AREA <br />SCOPE OF WORK <br />Mountain Coal Company (MCC) proposes a geotechnical field investigation program for the <br />Sylvester Gulch Facilities Area construction project. The purpose of this program is to <br />supplement the previous geotechnical program (MR189) and gather additional information that <br />will be used to determine material properties to estimate the behavior of the soils and rocks from <br />the new road alignment, particularly slope instability, wetlands, cut slopes, and foundation <br />stability. Two maps follow this scope of work that show the approximate location of the <br />boreholes. One shows the approximate location of the holes and the temporary roads on a <br />current topography map and the other shows the approximate location of the holes in relation to <br />the proposed Sylvester Gulch Facilities Area. The locations of the holes may vary a little, based <br />on actual field conditions. <br />A total of twelve holes will be drilled and are shown on the attached map. Nine of the holes will <br />be augured. Seven of these holes will be converted to piezometers. The other two will be <br />plugged and abandoned upon completion. The other three holes (holes 6, 8, and 9) will be cored <br />and then plugged and abandoned upon completion. Drilling fluids will need to be managed for <br />the three core holes only. The drill fluids will be contained in a closed drilling system (i.e., <br />recycled through tanks) and will not be discharged onto the ground. The approximate depth of <br />each of the boreholes will be 20 to 3~ feet deep. Some of the boreholes may be drilled deeper <br />than 35 feet, but should not exceed a maximum of 50 feet. The drilling depth will be dependent <br />on the depth to bedrock. Samples will be collected for various geotechnical parameters such as <br />gradation, Atterburg limits, and strength parameters. <br />Some cut and fill will be required for the construction of temporary access roads and the drill <br />pads. A drill pad will be necessary for the drill rig to work on a flat, stable surface. The <br />anticipated maximum area of the drill pad will be 20 feet by 20 feet, and the maximum road <br />width will be eight feet. Not all access roads will require excavation and may be accessible <br />"over the surface". The estimated maximum road length and maximum cut volumes for each <br />hole (including pad areas) varies as follows: <br />Borehole Road Leneth Est. Cut Borehole Road Leneth Est. Cut <br />MCCPZ97-1 30 fr. 105 cy MCCPZ97-2 250 fr. 330 cy <br />MCCPZ97-3 1 ~0 fr. 230 cy MCCPZ97-4 l0 ft. 85 cy <br />MCCPZ97-5 5 ft. 80 cy MCCDH97-6 80 fr. 155 cy <br />MCCPZ97-7 90 fr. 170 cy MCCDH97-8 50 ft. 125 cy <br />MCCDH97-9 90 ft. l70 cy MCCAH97-10 30 ft. 105 cy <br />MCCAH97-11 15 ft. 90 cy MCCPZ97-12 0 fr. 10 cy <br />U During construction of the pads and roads, topsoil will be removed and windrowed to the side. <br />U The roads and drill sites for hole 1-4, 5, and 8-11 will not be reclaimed immediately following <br />the project, as the disturbance associated with these holes is within the proposed disturbed area <br />of the Sylvester Gulch Facilities construction project. Windrowed topsoil in these areas will be <br />Exhibit 69 Murch 1997 <br />exh69mr210.doc <br />