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and highwalls will be 40 ft wide by 50 ft high. Actual build-out will vary based on observed <br />highwall performance. <br /> <br />The Observational Method is a step-wise approach to slope design by which new information is <br />regularly used to upgrade previous analyses. This method will be utilized as a practical <br />approach to designing slopes in a rock mass with variable conditions. Front Range Aggregates <br />will perform an experimental / trial initial excavation well within the mining limits in order to <br />observe the actual performance of the benches and highwalls in multiple orientations. This trial <br />excavation will be used to establish the basic design for the benches and highwalls. Evaluations <br />and changes to the highwalls and benches will be made as necessary over time based on <br />continuous observations of bench and highwall performance. <br />Front Range Aggregates will submit a report to the DRMS after the initial trial excavation is <br />complete. This report will detail actual observed bench and highwall performance and present <br />recommendations for the future development of slopes, benches, and highwalls in the mine. It <br />is anticipated that subsequent annual reports will not be necessary. However, the DRMS will be <br />notified by Front Range Aggregates of any significant changes to the mine plan. <br />UServerol\,common\PROJECTS\106052-000 ParkdaleMine Plan\R. Records and Correspondence\R.l l ReportsTermit_1_24_08.doc