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bottom fo the pit to construct 3H:1 V slopes. If the pit is mined to 45 feet, and no deeper, <br />where is the material coming from to push up the slope for reclamation? <br />Operations will be restrained from exceeding the 45 foot depth to provide for adequate <br />use of the bottom materials to establish finished slopes; in the absence of any data and <br />subsequent depths supported by the data that would provide for deeper extraction <br />depths beyond the 45 foot limit established respective of finished slopes and respective <br />assurances of the supporting data by the OMLR via an approved Technical Revision. <br />Item 2(b) — The response stated `The values used were either reported by Terracon or <br />in the absence of measured values we used table values provided by your agency.' <br />There appear to be some discrepancies between this statement and what was used in <br />the STABL for Windows model as shown in your `Soils Properties' screen capture in <br />Attachment A of the response letter. The attached Table 1 provides a summary of the <br />various parameters used in the model; reported by Terracon; and those recommended <br />by DRMS. Please update the analyses with unit weight, cohesion, and friction angle <br />values for each of the five soil layers recommended by DRMS in the attached Table 1, <br />or provide some rationale as to why other values should be used, specifically for the <br />parameters for which Terracon provided measured values and values recommended by <br />DRMS /DMG in the response reference.. <br />Please refer to attached correspondence from C.G.R.S. of 28 June 2011. <br />Additional Comments: Item 6 — The DRMS engineering staff uses the Galena Slope <br />Stability Analysis software (Version 5.02) to analyze slope stability. The staff used the <br />Varra Companies, Inc. correspondence of 29 June 2011 to the Colorado Office of Mined Land Reclamation 3 <br />(OMLR) in reply to OMLR correspondence of 21 June 2011 — Western Sugar Reclamation Land Development <br />Project — M- 2010 -049. <br />