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Figure 40.--Settlement point installation details. (Sheet 1 of 2.) From drawing 328-D-980.

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2794.30

SETTLEMENT POINT LOCATION CHART

26+00.38 2737.48 27+00.22 2710.72
28+00.34 2737. 16 29+00.07 2710, 56
30+00.35 2737.50 31+00.10 2710.76

31+99.92 2737. 24
34+00.13 2736. 89
35+99.94 27 36.88
37+ 99.92 2736. 68
40+00.02 2737. 14
41+99.79 2735. 79

33+ 00.02 2711.06
2710.71
35+00.19
37+00.03 2710.35
39+00.18 2711.09
40+ 99.89 2710.97
42+ 99.83 2710.85
44+99.78 2711.76
46+ 99.74 2710.36
48+99.70 2710.59
50+ 99.61 2710.61
52+99.55 2711.37
54+ 99.72 2711.74
57+00.77 27 11.18
59+ 00.73 2711.32
61+00.55 | 2711.61
63+ 00.55 2711, 19
2735.96
2735.96 65+ 00.53 2711.50
66+00.52 2736.92 67+00.44 2711.71
68 00.44 2737.44 69+ 00.47 2710.93
71+00.23 2711.52

53+99.52

2736.91
56+00.93 2735.97
58+00.8A 2735.94
60+00.7

62+00.71 64+00.69

2735.97

NOTES

For details of embankment settlement installation, see Dwg. 40-D-4414.
For details of foundation settlement installation, see Dwg. 40-D-4631.
Each installation placed as embankment progressed.

Crest settlement points located downstream from the axis of the
dam installed on 200' centers from Sta. 7+00 to Sta. 83+00 incl.
Crest settlement points located upstream from the axis of the dam
installed on 200' centers from Sta. 8+00 to Sta. 84 +00 inclusive.
Crest settlement points adjusted to camber elevation.
Settlement point elevations recorded to nearest 0.01 foot.
Elevations of each pipe extension on foundation settlement
installations recorded to nearest 0.01 foot.

Elevations of all crossarms recorded to nearest 0.01 foot.
All settlement points designated by Axis Station and offset
upstream or downstream from axis of dam.

At Sta. 53+00, Installation "A" installed as foundation settlement
apparatus from base of cutoff trench to El. 2703± and continued
as embankment settlement apparatus from El. 2703+ to upstream
face of dam.

Original settlement point elevations established January and
February 1954 except the following, established Febuary 1952:
127.50 U.S.- Stations 29+00 to 43+00, incl, and Stations 57+00
to 71+00 incl.

148.50 D.S.-Stations 28+00 to 42+00, incl., and Stations 56+00
to 68+00 incl.

263.50 D.S.-Stations 27+00 to 43+00, incl, and Stations 57+00 to 71+00 incl.

SETTLEMENT POINT LOCATION CHART

Tangent
Extended

Offset from

Axis Tangent Elevation
Extended

67.21 U.S.
5.90 D. S.
18.60 D.S.

[blocks in formation]

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.

[graphic]

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:

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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-
tract I2r-18601

Construction of dam--United Concrete Pipe Corp., Vin-
nell Co., Inc., and Ralph A. Bell, contract 12r-19084
Earthwork and structures except bridge structures, re-
location of C. B. & Q. Railroad--Perry McGlone Const.
Co., contract I2r-19157

Superstructures for bridges, relocation of C. B. & Q.
Railroad--American Bridge Co., contract 12r-19183
Spillway chute modification--Cass Co., contract 14-06-
D-1042

Constructing residence, combination garage and testing
laboratory, water and gas supply, and sewage disposal
systems for Government field construction facilities and
caretaker's residence--Northwest Realty Co., contract
I81r-1250

Relocation of county road at Swanson Lake--Nichols Const.
Co., contract I103r-1582

Total cost to the Government

$1,672,398

5,570,632

2,786, 959

546, 345

2,329

25,767

131, 232

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Stream gaging station, spillway channel--Rentlor Co., Inc.,
contract 14-06-701-1345

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
Lake--A. H. Williams

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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

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701C-330(SF)

701C-357 (SF)

Construction of terraces, Swanson Lake--A. H. Williams

Construction of terraces, Swanson Lake--James W.
McCormick

Subtotal, Minor Construction Contracts

135

276

338

$ 4,299

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