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TETRATECH RMC Mr. Mike Refer <br />May 12, 2004 <br />Page 7 <br />Setbacks listed indicate the minimal setback from the structure. The setback distance can be <br />increased as needed to address other restrictions. <br />TABLE 2 -SLOPE STABILITY CALCULATION RESULTS <br /> Minimum <br /> File Mud Water Mtntng F.O.S. <br />Scenario Setback Comments <br /> Name Lens? Table ~sbo <br />~ P) <br /> from <br /> Structure ft <br />I Tucson Rd road! y High 55 1.058 <br /> West Side road3 y Low 45 1.077 <br /> Tucson Rd <br />Z <br />East Side roads y Low 40 1.057 <br /> ° <br />x <br />3 m <br />Hig <br />hwa Hiwalll n Low 30 1.088 <br /> South Platte <br />4 Riverl n High 55 L165 <br /> River <br />5 North Side North! n High 75 I.OZI <br />6 Greenhouses Greeal y High 55 1.145 <br />7 Gas Well Gall y High 45 1.031 <br /> West Power <br />8 <br />Poles Wpolesl y High 50 1.048 <br /> Brighton <br />9 <br />Ditch Ditchl y High 55 1.175 <br />10 Highway? Hiway7l y High 65 1.081 <br /> North Side Hiway73 y High 55 1.099 Construction easement <br /> Southwest SWhwy71 y Dewater 35 L066 Stmctur~ <br />S power <br />11 e <br /> Highway 7 <br /> SWhwy73 y Dredge 35 1.104 <br />12 Southwest SWditchl y Dewater 35 1.059 Structure =toe <br /> Ditch SWditch3 y Dredge 30 1.118 <br />13 Southwest SWwestl y Dewater 30 L062 <br /> West Side SWwest3 y Dredge 30 1.014 <br />14 Southwest SWPolesl y Dewater 30 1.064 <br /> Power Poles SWPoles3 y Dredge 30 1.023 <br />LIMITATIONS <br />Our review is based on regional geologic mapping, present mining plans, bore hole data, and <br />stability analyses using typical strength parameters for the various strata in the critical sections. <br />Should the mining plans change or subsurface conditions vary from those pornayed in this letter, <br />we should be contacted in order to re-evaluate the potential affects on permanent man-made <br />