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C-1981-019 TR-81 <br />14 July 2010 <br />AR#2 - mlt <br />Page 6 of 6 <br />Addendum No. 3 has been revised correlate with the existing Exhibit 21, Item 1 S& W Study. <br />Appendix A has been renamed Appendix D and the figures new with TR-81 have been <br />renumbered beginning with Figure 10. This item is resolved; no additional response is <br />required. <br />300) We have noted certain discrepancies in the data presented in Table A-1 - Results of Stability <br />Analyses - Section A-A' as follows: <br />The CMS Cohesion value for Trials 1 and 2 is listed as 750 psf, when it should be 706 psf (per <br />Page 2 of the text). This may be a misprint in the table only; the correct value appears to have <br />been used in the Slope/W software (pp 22 and 23). <br />CMS Friction Angle and Cohesion values for Trials 5 thru 8 should be 17 and 706 (Mean <br />Parameters) rather than 14 and 288. Slope/W printouts have not been.provided for these Trials, <br />so we are unable to determine whether correct values were used to compute the Factors of Safety <br />reported. Please review Table A-1 entries and revise as appropriate. <br />Table A-1 has been renamed to Table D-1, and entries have been revised as appropriate. Item <br />resolved. <br />31(4) We have noted certain discrepancies in the data presented in Table A-3 - Results of Stability <br />Analyses - Section C-C'. The CMS Cohesion value for Trials 1, 2, 5 and 6 is listed as 750 psf <br />rather than 706 psf. This may be a misprint in the table only; the correct value appears to have <br />been used in the Slope/W software for Trials 1 and 2 (pp 26-27), but Slope/W printouts have not <br />been provided for Trials 5 and 6, so we are unable to determine whether correct values were used <br />to compute the Factors of Safety reported. Please review Table A-3 entries for CMS Cohesion <br />and Factor of Safety and revise as appropriate. <br />The entries in Table A-3 (now D-3) have been revised. Item resolved. <br />32(5) Note No. 1 on Figure 4 refers to Appendix B. The report supplied to the Division included only <br />Appendix A. Please. provide Appendix B for the Division's review. <br />The reference to Appendix B has been removed from Figure 4 (now Figure 13). Item <br />resolved. <br />33(6) On Figure 5, Curve No. 4, representing friction and cohesion for CO-3, has been extrapolated to <br />become Curve No. 6, the Lower Bound for stability analysis. We question whether an actual test <br />result is appropriate for use as a "Lower Bound", in that the number of samples analyzed is not <br />excessive, and there may well be other soils that are "worse" upon which the fill may be <br />constructed. Please provide additional rationale for the selection of the Lower Bound for the <br />clay overburden. <br />S& W has made a slight adjustment to the lower bound for clay, and provided additional <br />rationale, as requested, on Page 3 ofAddendum No. 3. This item is resolved; no additional <br />response is necessary. <br />This concludes my adequacy review of Colowyo's June 2010 response. Please contact me if you require <br />clarification of any of these items. <br />cc: Sandy Brown, DRMS