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C. Compact the subgrade to a minimum of 95 percent of maximum dry density as <br /> determined by ASTM D 1557. Accomplish supplementary compaction where required <br /> with approved mechanical vibrating or impact type tampers. <br /> D. Prime Coat: After the subgrade has been compacted and leveled, apply an asphalt <br /> prime coat, specified above, at 0.25 to 0.45 gallon per square yard to the surface of the <br /> subgrade and to the edges of the existing pavement. Tack coat cast iron manhole <br /> frames and concrete surfaces which will be in contact with the new asphalt. Prior to <br /> placing the new asphalt concrete, a tack coat shall be applied to all vertical surfaces of <br /> existing pavement, curbs, gutters and construction joints against which additional <br /> asphalt concrete is to be placed. The rate of application shall be approximately 0.10 <br /> gal/yd2 of surface covered. The tack coat shall be applied in accordance with State <br /> Standard Specification Section 39-4.02. <br /> E. Place the asphalt concrete on the prepared subgrade over the trench to a depth of not <br /> less than five inches as shown on the plans. Place asphalt concrete after the prime coat <br /> has set. Place the surfacing in two lifts. Spread and level the asphalt concrete with hand <br /> tools or by use of a mechanical spreader, depending upon the area to be paved. Bring <br /> the asphalt concrete to the proper grade and compact by rolling or the use of hand <br /> tampers where rolling is impossible or impractical. <br /> F. Roll with power rollers capable of providing compression of 200 to 300 pounds per linear <br /> inch. Begin the rolling from the outside edge of the replacement progressing toward the <br /> existing surfacing, lapping the existing surface at least 1/2 the width of the roller. If <br /> existing surfacing bounds both edges of the replacement, begin rolling at the edges of <br /> the replacement, lapping the existing surface at least 1/2 the width of the roller, and <br /> progress toward the center of the replacement area. Overlap each preceding track by at <br /> least 1/2 the width of the roller and make sufficient passes over the entire area to <br /> remove all roller rnarks and to produce the desired result, as determined by the <br /> Engineer. <br /> G. The finished surface of the new compacted paving shall be flush with the existing <br /> surface and shall conform to the grade and crown of the adjacent pavement. <br /> Immediately after the new paving is compacted, all joints between new and original <br /> asphalt pavement shall be painted with hot asphalt or asphalt emulsion and be covered <br /> with dry paving sand before the asphalt solidifies. <br /> n. Surface Smoothness: The surface smoothness of the replaced pavement shall be such <br /> that when a 12--foot straightedge is laid across the patched area between the edges of <br /> the old surfacing and the surface of the new pavement, the new pavement shall not <br /> deviate from the straightedge more than 1/4 inch. If the finished surface of the asphalt <br /> concrete does not meet the specified surface tolerances, it shall be brought within <br /> tolerance by either (1) abrasive grinding or (2) removal and replacement. The method <br /> will be selected by the Engineer and the corrective work shall be at the Contractor's <br /> expense. <br /> I. A seal coat shall be applied to the surface of all newly paved surfaces and shall extend a <br /> minimum of 12 inches beyond the new pavement to existing paved surfaces and seal <br /> the joint between existing and new pavement. Seal coat shall consist of a mixture of <br /> asphaltic emulsion and added water and be applied in accordance with the requirements <br /> of State Standard and reflectors as required to conform to that which previously existed. <br /> July 2007 Division III-72 NEI Phase II Water and Sewer <br /> CIP Nos. 7468, 7589, 7590 <br />