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• monitoring contained in the following sections are considered the primary factors <br />which could influence the RDA stability. <br />Qual'dy construction practices cannot be replaced by specifications or <br />inspections. The moisture content of the refuse and the lift thickness are the primary <br />factors affecting the degree of compaction. Compaction to at least 90 percent of <br />standard Proctor should not be difficult or require specialized equipment, if the <br />material is tracked in thin lifts without excessive moisture. The drain installation <br />should be extended regularly to keep the drain ahead of fill operations. Proper <br />surface grading and drainage practices will reduce the effects of precipitation. When <br />operational problems or weather produce a wetter than desired fill, placement should <br />be limited to the back of the RDA in the "uncompacted zone" (discussed in the <br />following section). Other areas of the RDA surface can then be worked until the <br />• unsatisfactory material has dried sufficiently to allow compaction. If production <br />considerations control, instead of good construction procedures, the stability of the <br />RDA could be compromised. Inspection and monitoring records should be reviewed <br />regularly to confirm procedures and refuse placement are according to the <br />recommendations. <br />PROPOSED RDA CONFIGURATION AND CONSTRUCTION <br />Recommended Sloae and Bench Configuration. <br />The recommended configuration is shown on Sheet 2, with typical details <br />shown on Sheet 3. The face should slope 2.2:1 (H:1~ between the benches. The <br />original design (Reference 3) indicated a large bench stepping back at about <br />elevation 7850. We believe this was included more to follow the existing grades than <br />• <br />22 <br />