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The highwall area surface was generally rubblized. For this rea on, we do <br /> not believe fracture mapping of this area would be particularly produ tive. The <br /> conditions we observed were similar to those identified by the A apito and <br /> ' Assocites report dated June 19, 1987. Review of highwall stabilit analysis <br /> presented by the previous report did not indicate concern to our repres ntative. <br /> ' We did observe potentially unstable boulder size pieces on th highwall. <br /> In our opinion, weathering and ongoing geologic processes will lead to ontinued <br /> ' rock fall in the highwall area. Our analysis of rock roll out did not indic to impact <br /> ' from potential rock roll out in the highwall area to Highway 141. <br /> 1 <br /> ' LIMITATIONS <br /> ' Five exploratory test pits were observed and field measuremerts taken. <br /> ' The accuracy of measurements made should be considered accordi g to the <br /> ' limitations of each instrument used. The exploratory test pits are represe itative of <br /> conditions encountered only at the exact exploratory test pit locations. Soil <br /> ' strength parameters and subsurface conditions used in the stability analy is model <br /> ' were assumed. Variations in the subsoil conditions are always possible. <br /> 1 <br /> 1 i <br /> Rhino Engineering,Inc. <br /> ' Unaweep Quarry <br /> GEG Job No.593 10 <br />