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Vermillion Ranch Limited Partnership/Surface Water Impoundment 13659-RX <br /> ' 4. If construction takes place during cold weather, care should be taken to prevent <br /> construction on frozen soils. In addition, fill materials should not contain snow <br /> and/or ice and should not be placed in a frozen condition. <br /> 5. A stable earth dam (safety factor equivalent or greater than 1.5-static; safety <br /> ' factor equivalent or greater than 1.0-seismic) for two dam heights have been <br /> considered for conceptual planning purposes. The stable dam heights are subject <br /> ' to the following conditions, in addition to site preparation and fill construction <br /> as recommended in this report: <br /> Analysis Parameters <br /> Soil Moist Unit Weight 120 pcf <br /> Cohesion 250 psf <br /> Friction Angle 140 <br /> ' Seismic Coefficient 0.311 <br /> Preliminary Dam Geometry Crest Hei ht of 20 Feet <br /> Maximum Crest Height 20 feet <br /> Maximum Pool Elevation 5 feet below crest <br /> Crest Width 12 feet <br /> Up <br /> stream Embankment Slop <br /> e :V 3: <br /> 1 <br /> Downstream Embankment Slope(H:V) 2.5:1 <br /> Preliminary Dam Geometry Crest Hei ht of 46 Feet <br /> ' Maximum Crest Height 46 feet <br /> Maximum Pool Elevation 5 feet below crest <br /> ' Crest Width 20 feet <br /> Upstream Embankment Slope H:V 3:1 <br /> Downstream Embankment Slope(H:V) 3:1 <br /> Downstream Stabilizing Fill Slo a(H:V) 5:1 <br /> The above parameters are based on a homogeneous earthen dam with earthen <br /> materials classified as SC, SM, CL, or ML according to the Unified Soil <br /> ' Classification System (USC). Fill soils are subject to compaction requirements <br /> as per Item 3, above. <br /> ' Note that the above parameters are provided only for preliminary design so that <br /> detailed geotechnical analysis may be performed. <br /> INBERG-MILLER ENGINEERS 9 February 26, 2009 <br />