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<br /> <br />Test Location Base Subgrade <br />Hole Depth Soil Tyke <br /> Fish Creek Borehole Access Road <br />13 0.2 miles southeast of Borehole 9" Sandy Clay (CL) <br />14 0.6 miles southeast of Borehole 6" Sandy Clay (CL) <br />15 1.0 miles southeast of Borehole ~" Sandy Clay (CL) <br />16 1.4 miles southeast of Borehole 8" Sandy Silt (ML) <br /> West Escape Shag Access Road <br />17 0.3 miles west of Substation 0" Sandy Clay (CL) <br />18 0.8 miles west of Substation 0" Sandy Clay (CL) <br />19 13 miles west of Substation 0" Sandy Silt (ML) <br /> Eastern Dewateting Borehole Access Road <br />20 50' north of existing buildings 0" Sandy Clay (CL) <br />21 1900' north of existing buildings 0" Sandy Clay (CL) <br />22 2400' north of existing buildings 0" Sandy Clay (CL) <br /> Waste Coal Pile Access Road <br />23 400' south of north end 10" Sandy Clay (CL) <br />24 300' north of south end 3' Sandy Clay (CL) <br /> SW Bleeder Shag Access Road <br />25 100' south of north gate 6" Sandy Clay (CL) <br />26 •300' west of middle gate 3" Sandy Clay (CL) <br />GRAVEL SECTION RECOMMENDATIONS <br />Based on our observations of [he current traffic use patterns and condition of [he roads, the data <br />obtained from the field and laboratory investigations and our experience with similaz projects we <br />believe [hat the majority of the problems associated with the subject roadways are attributed to <br />inadequate drainage conditions, poor subgrade soils and an inadequate gravel section. <br />For [he adequate performance of any roadway, positive drainage must be provided and maintained. <br />This includes periodic cleaning and regrading of the drainage ditches along the edges of the roadways. <br />In addition, the roadway surface should also be graded on a periodic basis to ensure that sufficient <br />crown or super elevation is maintained so that the gravel surface adequately drains to the ditches. <br />Ponding along the roadway surface must be avoided. Based on our observations, very little if any <br />crown has been maintained on the subject roadways. <br />Job No. 75-7.131 Vonhuxsc Colorado Consultants. Inc. Page ~ <br />