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Doug White, Western Fuels Mar. 11, 2013 <br />C- 2010 -089 TR -01 PAR Page 8 of 9 <br />4. DBMS: Please provide a statement addressing this requirement. <br />WFC: The SEDCAD runs indicate no flow through the emergency <br />spillway during a 25yr -24hr eveng. The spillway is built with 2 feet from <br />the top of the dam embankment to the bottom of the 10 foot wide <br />emergency spillway. The embankment was compacted to 90% depth, <br />minus 10% (0.1 x 2.0 = 1.8) results in an emergency spillway 1.8 feet <br />deep. As stated in response to Item 5 above, even with a blocked primary <br />spillway, and an emergency spillway flow depth of 0.18 ft., the required <br />freeboard of 1.0 feet is achieved. <br />DBMS: Response accepted. <br />(e) Are the combined upstream and downstream slopes not steeper than 5H:1 V (they <br />are 6H:1 V), is neither steeper than 2H:1 V (each is 3H:1 V). Item satisfactorily <br />addressed in MR -02 submittal. <br />4.05.9(8) — Stability <br />(b) A minimum static safety factor of 1.3 for a normal pool with steady state seepage <br />saturation conditions is required. Lambert's study evaluated the sudden <br />drawdown condition, but did not determine a factor of safety for the required <br />condition. The unit weight used in the calculation was 115 pcf, which seems too <br />low (average constructed was 123.5 pcf). <br />5. DBMS: Please review and revise the parameters used, as appropriate, <br />and provide a stability analysis for the condition described in 4.05.9(8) (b). <br />Please also provide the laboratory strength test results (direct shear <br />strength) referenced by Lambert. <br />WFC: Included with this submittal is an additional letter document dated <br />January 7, 2013 from Lambert & Associates, provided for inclusion into <br />Appendix 2.05.3(4) -6 that addresses the compliance with the safety factor <br />for a normal pool steady state seepage saturation condition. Also included <br />is a tabulation of the direct shear strength test of remolded material. <br />DBMS: Response accepted. <br />4.05.9(9) - Will embankment faces and slopes be vegetated or stabilized by other means? <br />6. DBMS: Please provide a statement addressing this requirement. <br />