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constructed in a controlled manner in horizontal lifts <br />• not to exceed three feet in thickness, Compaction vti11 <br />be accomplished by controlled passes of the excavation <br />equipment or by a self-propelled tamaing foot-type roller <br />if required to achieve the desired results (approximately <br />90;6 of standard proctor density, or 112 to 115 PCF), <br />Due to the extreme heterogenous nature of the site material, <br />a definite specification ~~+ill require field decisions and <br />monitoring of the fill during construction. <br />Additional material from the site excavation ~.vi11 be <br />utilized in construction of the Levais Gulch fill and the <br />ramp-and-toe dike for the north spoil area. Both of these <br />fills will be constructed in a similar manner to the highwall <br />• fill excepting the Levris Gulch embankment which will receive <br />additional control, use of selected materials, and specified <br />use of compaction equipment, Also the fill under and <br />adjacent to the upper bench sediment collection basin will <br />be subjected to more rigid standards. Large boulders un- <br />covered in the excavation vri11 be reduced in size and <br />utilized for rip-rap at the outlet of the Levris Gulch <br />culvert and sediment road outlet structure, The only <br />excavation contemplated in original ground is for the Lewis <br />Gulch fill abutments, utility trenches, and the site bench <br />sediment pond, Excavation for the utility trenches and <br />the site bench sediment pond may require blasting which vrill <br />be determined after the bulk excavation is completed, <br />• Blasting if required will be accomplished utilizing pre- <br />splitting and close spacing of small drill holes (3" or <br />82 <br />