Laserfiche WebLink
-16- <br />• <br />Compaction <br />The embankment soils should be placed in approximate hori- <br />zontal lifts with a maximum loose lift thickness of 10 inches. <br />The embankment and cutoff soils should be compacted to a density <br />of at least 98 percent of the maximum density determined using <br />the standard Proctor test (ASTM D 698). Moisture content for the <br />embankment soils should be adjusted before compaction to a range <br />of 2 percent below to a maximum of 4 percent above optimum. <br />Slope Protection <br />Adequate protection against wave action should be provided on <br />the upstream face of the dam in the form or riprap. In our opinion, <br />• the riprap should extend from the crest of the dam to a point well <br />below the minimum operating pool. The embankment section presented <br />on Fig. 8 shows the riprap to elevation 25 which we believe to <br />be well below the minimum operating pool. Considering the minor <br />amounts of water that will be contained in this reservoir, it may be <br />desirable to minimize the riprap. An alternative procedure would <br />be to construct riprap from approximately elevation 25 to elevation <br />40, which is about 2 feet above the 10-year, 24-hour event. From <br />elevation 40 to the crest, the embankment could be protected by <br />vegetation. We recommend a minimum of 18 inches of sandstone riprap. <br />A sandstone riprap type material is available in the area of the mine. <br />Soils which will be used to construct the embankment will be <br />n <br />U <br />