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b. Geologic Investigations. The Hourglass Dam site will be described. <br />All readily available data on site conditions will be reviewed. <br />Additional field explorations, surveys and field geologic mapping <br />will be carried out, as described in Appendix A Scope of work <br />under the Contract for Consulting/Professional Services dated <br />October 1989, between the City of Greeley, Colorado and McCall - <br />Ellingson and Morrill, Inc. The additional work is described in <br />Appendix A of that Contract, as follows: <br />1. Perform field explorations to evaluate subsurface conditions <br />and to develop information regarding characteristics of the <br />soil and rock materials found at Hourglass Dam. This will <br />include the following: <br />Two borings will be located in the main dam section and shall <br />be drilled to 80 feet in depth. Two more holes will be <br />drilled at Station 16 + 00 along the dam crest in the vici- <br />nity of the downstream face po area. These holes shall <br />be approximately 55 feet in d 4 Test borings may be. <br />stopped above the depths d s if 1 ers or difficult <br />drilling conditions are ed y shallow depth, <br />for example 20 feet in hole, and addi- <br />tional hole will be attem' hole, sample attempts <br />will be made and Standard P e 1 Tests (SPT) will be <br />taken at approximately ev -f t intervals. PVC casing <br />will be placed in each h- lled through the embankment to <br />serve as a permanent piezo er. <br />2. A field survey to supplement existing topographic anti design <br />information will be performed. This shall include key spot <br />elevations appurtenant to the dam and facilities, bore hole <br />locations, critical cross sections of the supply canal side <br />channel spillway. Elevations will be tied to Comanche <br />Reservoir Datum, and horizontal control will be tied to <br />established land corners, if land corners are reasonably <br />accessible. <br />3. Perform field geologic mapping to develop information for use <br />in illustrating geologic conditions at the site. The report <br />will include a typical cross- section representing data <br />obtained form the test boring program. <br />4. The Project Manager of the Consultant shall be Lyman <br />Flook. <br />The geologic reports, including geologic maps and sections, geologic logs of <br />foundation exploration holes, and lags of materials in exploration holes will be <br />included as an appendix to the rehabilitation feasibility report. <br />