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1 <br />' <br /> II. BACKGROUND <br /> <br /> 2.01 Mine Plan Amendments and Technical Revisions <br />' Mine Plan Amendments Nos. 3 and 4 revised the approach to slope design at the Morrison <br /> Quarry with the implementation of the Observational Method throughout [he quarry. These <br /> Amendments carried over in Amendment No. 5. The significant changes presented in these <br />' Amendments were a reconfiguration of the east side of the Central Quarry to address slope <br /> instabilities in that area and the provisional change in slope inclinations elsewhere to as steep <br /> as O.SH:1 V based on evaluations of preliminary slopes established at 1 H:1 V. As a condition <br /> of the Amendments, the steeper slopes and revised configuration could be implemented only <br />' in accordance with specific, predetermined steps outlined in the Observational Method. <br /> Conditional approval of the Amendments required annual reporting of geotechnical data, <br /> slope stability evacuations, and current mine conditions in areas where steeper slopes were <br />' utilized, or where unusual conditions were encountered. <br />' 2.02 Observational Method <br /> The Observational Method as described in Mine Plan Amendments Nos. 3 and 4, is a step- <br />' wise approach to slope design by which new information is regularly used to upgrade <br />previous analyses. This method was utilized as a practical approach to designing slopes in a <br /> rock mass with variable conditions, in which some areas are poorly exposed and difficult to <br /> characterize. This method establishes baseline conditions during initial evaluations. <br />' Observed initial conditions are then compared with the baseline for analyses. As a required <br /> condition of permit approval, annual geotechnical reports are presented to provide the <br /> opportunity for periodic regulatory review of geotechnical conditions relating to mining <br />' activities. <br /> The Observational Method is applicable to any slope in the quarry, except the west side of the <br />' Central Quarry, which is steeper than 1H:1V. <br /> <br /> <br />CJ <br />~I <br /> <br />1 <br />G'\VRO1 F.1. 1'S\?OI W Mnrrisou (Iwrn\0(13\ 19'1\newOOmarkup.Jrx <br />