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as determined in accordance with ASTM D 698. The loose lift <br /> thickness before compaction shall not exceed twelve inches 0 2"). <br /> 10.2.2 The in-place moisture content of the Zone 1 fill shall be within <br /> minus two percent (—2%) and plus two percent (+2%) of the <br /> optimum. To assure maximum consistency, water, as required, <br /> should be added to the materials at the borrow area. <br /> 10.2.3 In general, the finer grained Zone 1 soils shall be placed in the area <br /> upstream of the dam centerline and the coarser grained Zone 1 <br /> materials shall be placed in the area downstream of the dam <br /> centerline. <br /> 10.3 ZONE 2 FILL <br /> 10.3.1 Zone 2 fill shall be placed in horizontal loose lifts and compacted to <br /> a minimum of ninety-eight percent (98%) Standard Proctor density <br /> as determined in accordance with ASTM D 698. The loose lift <br /> thickness before compaction shall not exceed twelve inches (12"). <br /> 10.3.2 The in-place moisture content of the Zone 2 fill shall be within <br /> minus two percent (—2%) and plus two percent (+2%) of the <br /> optimum. To assure maximum consistency, water, as required, <br /> should be added to the materials at the borrow area. If the <br /> Contractor chooses to mix excavated rock with earthen fill, the rock <br /> shall be combined in proportions that will conform to the material <br /> specifications and such fill shall be blended well to provide a uniform <br /> mixture by windrowing, disking, or other approved methods. <br /> 10.3.3 In general, the larger stones and cobbles shall be placed in the area <br /> at or near the upstream face of the dam and the finer grained Zone <br /> 2 materials shall be placed near the Zone 1 area. Larger stones and <br /> cobbles shall be placed at the upstream face of the embankment in <br /> sufficient quantity to provide slope protection equivalent to that <br /> existing at undisturbed portions of the embankment. <br /> SPEC.A- EARTHWORK <br /> PAGE 12 <br />