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<br /> <br />LAW ENGINEERING TESTING COMPANY <br /> <br />GEORGE F, SOWERS <br />Senior Consultant <br />-Senior Vice President <br /> <br />Environmental Sciences. Geotechnical and Construction S6McBS <br />2749 DELK ROAD.S.E./ MARIETTA. GEORGIA 30067 14041971-9005 <br /> <br />January 12, 1978 <br /> <br />Director of Design and Construction <br />Engineering and Research Center, Bldg 67 <br />U.S. Bureau of Reclamation <br />P.O. Box 25007 <br />Denver, Colorado 80225 <br /> <br />Attention: <br /> <br />Subject: Safety of Project Feasibility Design =or <br />Foundations and Earth Embankment, Narrows Dam <br />Job Number EC-383 <br /> <br />Dear Sir: <br /> <br />Your Purchase Order 8-07-DP-00214 dated December 5, 1977 <br />requested an inde~endent evaluation of the project feasibility <br />designs for the foundations and earth embankment of the pro- <br />posed Narrm,s Dam of the Pick-Sloan Hissouri River Basin Program. <br />A verbal report was given to your staff on Tuesday, January 10, <br />1978. This written report confirms and expands the verbal pre- <br />ser:tation. <br /> <br />1.0 Review Procedure <br /> <br />An independent panel of Dr. Howard Coombs, Mr. Thomas M. Leps, <br />and r met in Denver, December 5, 1977 for a briefing on the pro- <br />ject ~y the Bureau of Reclamation Staff. On December 6, the <br />panel inspected the dam site by automobile. We made a shcrt <br />aerial reconnaissance of the dam site and reservoir plus an on- <br />foot examination of the left abutment in the vicinity of the <br />Auxiliary and Operating SpillNays. We observed the excavation <br />of a shallow test trench in a proposed borrow pit for clay core <br />in the left flood plain or low level terrace of the South Platte <br />River immediately upstream of the embankment toe. Finally, we <br />examined a number of surficial outcrops of typical soils in the <br />right or south bank end of the embankment and the south side of <br />the reservoir. <br /> <br />A considerable amount of basic study data were furnished to <br />us for study. They are classified below without attempting ~o <br />