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<br />1 <br />1 <br /> <br /> <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br /> <br />1 <br />IPITRODUCTION <br />This report presents the results of a geotechnical investigation con- <br />ducted at the site of 3 proposed retention dams to be located at the Red <br />Canyon (tine; in Sections 13 and 14, Township 13 South, Range 94 l4est; 3 to <br />4 miles northwest of Cedar Edne, Delta County, Colorado. The purpose of <br />this investigation and analysis was to determine the subsoil conditions in <br />the foundation and borrow areas of the proposed structure, and to determine <br />the design criteria which should be incorporated into the final construc- <br />tion plans of the structures. <br />PROPOSED RETENTIOPJ DAMS <br />It is our understanding that the proposed retention dams will be 10 feet <br />in height at their maximum section, and constructed in the locations shown <br />on the Test Hole Location Plan, Figure 1. It is assumed that crests will be <br />placed at maximum elevations of G,335; 6,328; and 6,318 feet for dams 1, 2 <br />and 3, respectively. Crest lengths of the proposed dams will be approximately <br />100 to 150 feet and the dams will be spaced less than 200 feet on center. <br />FIELD INVESTIGATION <br />The field investigation for tfie proposed dams consisted of a total of <br />eight test holes drilled nn October 18, 1979 and three test pits excavated <br />on October 25, 1979. Refer to Figure 1 for the test hole and test pit loca- <br />tions. The test holes ~•~ere drilled utilizing a 4 inch diameter, continuous <br />flight po:ier auger. liaterial encoun±ered in the test holes was logged by <br />our fielrJ engineer on the site during the drilling operations. The various <br />soils that were encountered during the drilling operations are sho~,vn on <br />Figures 2 through 4, Logs of Test Holes. The soils were sampled utilizing <br /> <br />