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controlled pneumatic or vibrating tampers having a minimum static weight of 1500 <br />pounds. <br />D. Lift Thickness, Placement Density and Moisture Requirements for Soil Materials <br />Containing Small Amounts of Clay or Silt, and Having Maximum Particle Sizes of 3 - <br />inches or Less: For embankment fill and backfill materials containing between 5 and 12 <br />percent by dry weight of particles pass a U.S. Standard No. 200 sieve, place and compact <br />each layer of backfill or fill materials in accordance with either Specification 3.63 or <br />3.6.C. I., above, at the discretion of Engineer. <br />E. Placement Requirements for Spoil Fill Materials: Spread spoil fill materials in uniform <br />horizontal layers not more than 12 inches thick. Compact each layer with a minimum of <br />four passes (with a pass defined as at least one complete coverage of the track) over the <br />entire surface with the track of a crawler -type tractor weighting at least 20 tons, or by <br />controlled movement of the hauling equipment so that the entire surface is traversed by <br />not less than one tread track of the loaded hauling equipment. <br />F. Placement Requirements for Riprap: <br />1. Place riprap in a manner that prevents segregation of large and small rock pieces. <br />Place riprap stones forming a continuous blanket. <br />2. Place large stones as close together as possible. Use smaller stones to fill in areas <br />between the larger stones. <br />3. For riprap placed on geotextile, place in a manner that prevents damage to or <br />wrinkling of the underlying geotextile. Maximum drop height shall be 2.0 feet. <br />4. Place riprap in a manner that does not displace underlying filter blanket or designated <br />underlayment. <br />5. Finish surface at grade by compressing flat with the bucket without breaking or <br />cracking stones. <br />3.7 GRADING <br />A. General: Uniformly grade areas to a smooth surface, free from irregular slope changes. <br />Comply with compaction requirements and grade to cross sections, lines and elevations <br />indicated on the Drawings. <br />1. Provide a smooth transition between existing adjacent grades and new grades. <br />2. Cut out soft spots, fill low spots, and trim high spots to conform to required surface <br />tolerances. <br />B. Site Grading: Slope temporary grades to direct water away from structures and <br />excavations where practicable, and to prevent ponding. <br />C. Finish Grade Tolerances: Finish grade top surfaces of backfill or fill to within +/- 0.2 <br />feet of required elevations shown on the drawings, except as follows: <br />Earthwork February 2017 02200-9 <br />