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Rifle Gravel Pit#1 Project No.21-010R-C2 <br /> Garfield County,Colorado <br /> 4.0 SUMMARY <br /> RJ Engineering conducted a global stability evaluation where we believe proposed mining could <br /> impact existing utilities. Based on our evaluation, the factor of safety for the final slope <br /> configuration is well above industry standards. We believe the slopes as proposed should be <br /> stable and should not affect the existing utilities or areas within the ROW. <br /> 5.0 LIMITATIONS <br /> This study was conducted in accordance with generally accepted geotechnical engineering <br /> practices in this area for use by the client for design purposes. The conclusions and <br /> recommendations submitted in this report are based upon the data obtained from exploratory <br /> test holes and field reconnaissance. The nature and extent of subsurface variations across the <br /> site may not become evident until excavation is performed. If during mining operations, <br /> conditions appear to be different from those described herein; this office should be advised at <br /> once so reevaluation of the analysis may be made. <br /> The report was prepared in substantial accordance with the generally accepted standards of <br /> practice for geotechnical engineering as exist in the site area at the time of our investigation. <br /> No warranties, express or implied, are intended or made. <br /> Respectfully Submitted, <br /> RJ Engineering & Consulting, Inc. <br /> Richard D. Johnson, P.E. <br /> Principal <br /> 4 <br />