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M-2000-016, Lafarge West, Inc.: Riverbend Operation, AM-Ot June 23, 2005 <br />Adequacy Memo #2 - Geotechnical Review Page 2 <br />Please be aware that future models should include the bases for the flow rates, and flow <br />rates employed for predicting drawdown within one cell should be the same. <br />From the Division's check of a sampling of the slope stability calculations, it is evident <br />that the critical failure surface has not always been identified. For slope stability <br />analyses to be credible, it is essential that sufficient effort be made to identify the critical <br />failure surface for each scenario evaluated. <br />Please also keep in mind as you are revising maps to address adequacy issues, that <br />wherever discrepancies exist between the setbacks provided in the geotechnical exhibit and <br />the maps, the Division may enforce the more conservative setback, whether in the <br />documentation, geotechnical exhibit, or the maps. However, if one of these needs to be <br />changed, all must be changed to provide consistency within the permit documents and <br />adequacy review responses. <br />