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Fill Placement and Compaction. The embankment fills should be placed in <br />thir4 lifts (8 to 12 inches loose thickness). The £11 should be moisture <br />conditionedta within Z percent of optimum moisture content and compacted <br />to at least 95 percent of stands rd Proctormaximum dry density (ASTM D 698). <br />The placing and spreading of fill materials should be started at the lowest <br />point of the embankment Fill placement and compaction should be observed <br />and tested by a qualified geotechnical engineering firm. <br />Toe Drains. Drains beneath the downstream toe are not recommended <br />unless the long term water storage depth exceeds 10 feet. This is based <br />upon analysis usingthewelghted creep method ofevaluating seepage below <br />embankments (Reference 3). If the water storage depth exceeds t0 feet, a <br />deeper keyway or toe drains may be required. <br />Monitoring. Embankmentconstructionproceduresshouldbedocumented. <br />• Fill placementand compaction should betested. The embankmentshould be <br />regularly inspected according to State regulations. <br />LIMITATIONS <br />The analyses and conclusions presented in this report are forthe conditions <br />described in the report. Variations in conditions are always possible. We believe <br />this study was pertormed using methods and procedures consistent with other <br />professionals practicing geotechnical engineering in this area at this time. No other <br />w~lrrenty, express or implied is made. <br />KENNECOTT ENEROY <br />COLON'YO COAL cOMPANV • SONTH TAVLORSEOIMENTATION POND <br />CTL~T JOB NO. ~6,B6i <br />8 <br />• Exh. 7-20F-12 Revision Date: 1/05/07 <br />Revision No.: PR-02 <br />