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<br />. <br /> <br />Q839 <br /> <br />. <br /> <br />. <br /> <br />The extent of explorations is shown in appendix F. Preparation of the <br /> <br /> <br />dam foundation would be accomplished qy stripping an average of six <br /> <br /> <br />inches of material from the site and qy flattening the abutments to a <br /> <br /> <br />stable slope. A cut-off trench of adequate size would be excavated <br /> <br /> <br />thrOugh the ione of weathered rock and backfilled with impervious mate- <br /> <br /> <br />riaL it groutcut-tain would extend approximatElly 40 feet inti> rock <br /> <br /> <br />below the cut-off to preclude piping and leakage from underseepage. The <br /> <br /> <br />characteristics of the embankment section have been adapted to the em- <br /> <br /> <br />bankment material available and to the foundation conditions at the site. <br /> <br /> <br />The cost estimate includes an alldwanbe for the amount of drilling, <br /> <br /> <br />grouting, and' other treatment considered necessary as determined qy <br /> <br /> <br />actual exploration work. <br /> <br /> <br />8. Concrete aggregate. - Sour~es of aggregate were investigated <br /> <br /> <br />for the project. Natural deposits of gravel in the general vicinity of <br /> <br /> <br />the Trinidad Reservoir Project are not sui table for use as concrete ag- <br /> <br /> <br />gregate. Acceptitr:cs C':>:1crete aggreg2,te is 87Eilable in commercial <br /> <br /> <br />quantities at Pueblo, Colorado, app~oximately 94 miles to the north, <br /> <br /> <br />with direct rail connection. <br /> <br /> <br />9. Embankment materials. - l'iateriald from numerous auger holes and <br /> <br /> <br />five test holes, were tested to check the ~uanti~y and suitability of <br /> <br /> <br />the material for use in the embankment. Results of field investigations <br /> <br /> <br />and laboratory tests indicated that embankment materials would be avail- <br /> <br /> <br />able in sufficient quantities within a 2-mile radius of the Trinidad dam <br /> <br /> <br />site. Rock from the spillway, outlet tunnel and shaft, and cut-off ex- <br /> <br /> <br />cavation would be spoiled on the upstream slope of the embankment. Rock <br /> <br /> <br />suitable for use in the downstream spall blanket is available from for- <br /> <br /> <br />mations within the reservoir area. <br /> <br /> <br />10. Relocations. - Included in the recommended plan of improvement <br /> <br /> <br />are the relocations of the Colorado and Wyoming Railway, Colorado High- <br /> <br /> <br />way 12, and the relocation of a 5,OOO,OOO-gallon city water-supply <br /> <br />3 <br /> <br />APPENDIX E <br /> <br /> <br />. <br />