2794.30 SETTLEMENT POINT LOCATION CHART 26+00.38 2737.48 27+00.22 2710.72 31+99.92 2737. 24 33+ 00.02 2711.06 53+99.52 2736.91 62+00.71 64+00.69 2735.97 NOTES For details of embankment settlement installation, see Dwg. 40-D-4414. Crest settlement points located downstream from the axis of the Elevations of all crossarms recorded to nearest 0.01 foot. At Sta. 53+00, Installation "A" installed as foundation settlement Original settlement point elevations established January and 148.50 D.S.-Stations 28+00 to 42+00, incl., and Stations 56+00 263.50 D.S.-Stations 27+00 to 43+00, incl, and Stations 57+00 to 71+00 incl. SETTLEMENT POINT LOCATION CHART Tangent Offset from Axis Tangent Elevation 67.21 U.S. 62.80 D.S. 2793.43 81+ 63.71 83+ 43.49 166. 44 D.S. 2736.96 217. 92 D.S. 2736.83 Figure 40.--Settlement point installation details. (Sheet 2 of 2.) From drawing 328-D-980. The holes were backfilled after installation. All tips were connected with plastic tubes to gages in a terminal well at station 54+00, 183.5 feet downstream from the axis of the dam. A terminal well is shown in figure 38. Pressures in the embankment are transmitted from the tip through the water-filled plastic tubes, and observed on the gage. 62. Settlement Installations. - An embankment settlement system was installed in a test pit at station 53+00, 99 feet upstream from the dam axis. The lowest crossarm of the system was placed on shale bedrock at about elevation 2649. Backfill was completed around the riser pipe from this crossarm at about elevation 2707, and nine additional crossarm units were placed at 5-foot intervals to the surface of the completed embankment. Two standard-type foundation base plates (fig. 39) were installed at stations 15+00 and 21+00, 20 feet upstream from the axis, on the unconsolidated loessial foundation in the abutment of the dam. Also, four temporary plates, each consisting of a steel plate and riser pipe extending to the surface of the embankment, were installed at the following locations and elevations: After the embankment had been completed above a plate, the plate was located by drilling and an access pipe was installed to the surface of the dam. A total of 173 surface settlement points were installed at 200-foot intervals on the surface of the embankment and parallel to the dam axis (fig. 40). These points consist of 3/4- to 1-inch reinforcement bars ranging in length from 5 to 8 feet. These bars were driven flush with the ground surface and a concrete collar, approximately 15 inches thick and 15 inches in diameter, was placed around each bar within 3 inches from the top. As concrete was placed, the bars were alined and the upper end of each bar was center punched. Shallow holes were drilled near the edges of the spillway floor slab and wall footing for use in determining elevations. The elevation of each hole was obtained by means of a level and leveling rod. In the canal outlet works, a series of 3/8-inch-diameter brass bolts with round heads were placed at 25-foot stations in the invert for use in determining settlement. Vertical control was obtained with the aid of two permanent monuments located on the line center of the canal outlet works. APPENDIX A Cost summary: (A cost breakdown for Trenton Dam and Reservoir and the railroad and highway relocations, as of August 28, 1957.) Major Construction Contracts Specifications number 2689 3047 3112 3113 4260 VII-111 701C-200 Item, contractor, and contract number Foundation construction--Marshall, Haas and Royce, con- Construction of dam--United Concrete Pipe Corp., Vin- Superstructures for bridges, relocation of C. B. & Q. Constructing residence, combination garage and testing Relocation of county road at Swanson Lake--Nichols Const. Total cost to the Government $1,672,398 5,570,632 2,786, 959 546, 345 2,329 25,767 131, 232 Stream gaging station, spillway channel--Rentlor Co., Inc., 6,820 Subtotal, Major Construction Contracts $10,812,229 APPENDIX A (Continued) Minor Construction Contracts Specifications number Item and contractor 701-03-733-52 Reconstruct four signal mounds and construct an earth cattle crossing on relocated C. B. & Q. Railroad, and salvage 40" x 40' CMP and install at new location-Perry McGlone Const. Co. 701C-03-3 Preparation of site for tree and shrub planting, Swanson 701C-305(SF) Summer fallowing tree sites, Swanson Lake--John D. Williams 701C-314(SF) Electric power connection for irrigation outlet works, Trenton Dam--McCook Public Power District 598 135 701C-330(SF) 701C-357 (SF) Construction of terraces, Swanson Lake--A. H. Williams Construction of terraces, Swanson Lake--James W. Subtotal, Minor Construction Contracts 135 276 338 $ 4,299 |