Boonton Dam

(Fig. 49).

A preliminary organization acquired right-of-way, land for quarry, built quarry railroad, trestles along the dam, cofferdams and office buildings, installed pumps and considerable plant, did about 75 per cent, of the excavation, quarried a large quantity of stone and cut about 80 per cent, of the Ashlar.

Estimated value of the work, about $498,600.

A contract was then let for:

Earth excavation..........

45,400 cu. yd.

Rock excavation..................................

15,300 cu. yd.

Embankment.....................................

108,000 cu. yd.

Slope paving...........

7,300 cu. yd.

Cyclopean masonry, at $1.98.......................

229,850 cu. yd.

Concrete masonry.................................

5,831 cu. yd.

Ashlar and dimension stone.............

19,646 cu. yd.

At contract price of $663,700, which about represented the cost to the contractor; various allowances increased the amount finally paid the contractor, to.............

$720,000

Portland cement (not included above) 176,000 barrels........

281,400

Total not including engineering, about.......................

$1,500,000

Maximum progress 21,000 cu. yd. per month.

Section of Boonton dam, New Jersey.

Fig. 49. Section of Boonton dam, New Jersey; built 1000 to 1906; Cyclopean upstream face rubble; downstream face ashlar; 2150 ft. long; max. height 103 ft.; contains 255,327 cu. yd.; masonry all kinds.

Wachusett Dam

(Fig. 50).

Much preliminary work was done by forces employed directly by the Metropolitan Water Board. This included preliminary surveys and borings in 1893-94, supplemented by many more borings in the latter part of 1895 and during 1896.

In 1897 the Board constructed the upper temporary cofferdam, the small flume, and about 200 ft. in length of the large flume. During 1899 a contract was let for a small amount of earth and rock excavation, and the Water Board directly constructed the remainder of the large flume. During 1900 considerable earth excavation was done and the lower temporary dam was built by Metropolitan Water Board forces while plans and specifications were being drawn up for the main contract. The main contract was awarded early in October,

1900, and the illustration Plate IV, Fig. C shows the temporary works and the condition of the pit at that time.

Following are the principal quantities and prices of the main contract as per the final estimate.

Section of Wachusett dam, Mass.

Fig. 50. Section of Wachusett dam, Mass.; built 1900 to 1906; rubble masonry cut-stone faces; length: main dam, 971 ft., overflow Weir, 452 ft., core wall 53 ft., total 1476 ft.; max. height 207 ft.; from the lowest point of cut-off trench 227 ft., contains 266,663 cu. yd. of masonry all kinds.

Earth excavation, ten classes, aggregating 274,087 cu. yd. at prices ranging from 25 cents to $1, total.........

$122,369.30

Rock excavation, eight classes, aggregating 102,640 cu. yd. at prices ranging from 90 cents to $4, total......

116,709.05

Rubble masonry:

1-2 Natural cement mortar, 179,755 cu. yd. at $3.80.....

683,069.00

1-2 Portland cement mortar, 31,911 cu. yd. at $4.80.......

153,172.80

1-2 1/2 Portland cement mortar, 8927 cu. yd. at $4.55.......

40,617.85

1-3 Portland cement mortar, 28,333 cu. yd., at $4.20......

118,998.60

1-1 Natural cement mortar, 2994 cu. yd. at $4.00.....

11,976.00

Carried forward....................

$1,246,012.60

Brought forward.........

$1,246,912.60

Ashlar masonry:

3411.4 cu. yd. at $12.00........

40,936.80

4556.8 cu. yd. at 12.50..........

55,710.00

1168.6 cu. yd. at 13.50..........

15,776.10

Dimension stone masonry:

1,776.00 cu. yd. at $16.50..........

29,304.00

965.63 cu.cyd. at 20.00............

19,312.60

Brick masonry:

794.0 cu. yd. at $15.00..........

11,910.00

270.5 cu. yd. at $ 14.00...........

3,787.00

Concrete masonry:

1-2 1/2-4 1/2 Portland, 7208.2 cu. yd. at $6.50...............

46,853.30

1-3-6 Portland, 1313.6 cu. yd. at $5.50..................

7,224.80

1-2-5 Natural, 1134 cu. yd. at $4.35....................

4,932.90

1-3-6 Natural, 19 cu. yd. at $3.75.............

71.25

Slope paving:

1 130 cu. yd. at $6.00............

6,780.00

769 cu. yd. at 3.25.............

2,499.25

Hauling and setting metal work, 893.6 tons at $14.00..........

12,510.40

Various items - face dressing, granolithic surfacing, roadways and paths, furnishing and laying vitrified pipe drains', drilling holes on side lines of cut-off trench (see page 44).

Extra and special items of work and allowances................

193,491.27

Total.................................................

$1,698,012.27

Other contracts were:

Preliminary excavation in 1899..........................

19,120.00

Special castings........................................

16,286.65

Valves and gates.........

29,917.67

Bronze grooves for stop planks and screens..........

17,363.00

Miscellaneous.................

23,899.66

Total of contracts..............

$1,804,599.25

Summary of cost of Wachusett dam:

Engineering............

$341,697.56

Preliminary (1).............

24,518.93

Temporary works............

120,173.53

Additional (2)..................

114,279.41

Contracts..............

1,804,599.25

Power and gate house............

72,937.34

Total...............

$2,378,206.05

(1) Borings. (2) Excavation done by Metropolitan Water Board.

The masonry prices include the cost of cement; cement cost delivered, Portland about $1.55 and American about $0.70 per barrel.

Sand was obtained from a pit on land of the Commonwealth and hauled 3/8 mile by teams to the dam.

For further description of various features of the work see page 23, Borings; page 33, Temporary works; pages 140 and 160, Plant and power.

Farnham Dam

(See Plate XVI, Fig. D).

Built for the water supply of Pittsfield, Mass. 2 1/2 miles from railroad.

Cyclopean masonry with concrete block faces. The gravity section is about 600 ft. long; this is extended to 900 ft. total length, by corewall and embankment section at each end.

The quantities and prices of the principal items were as follows:

Earth excavation, 15,245 cu. yd. at 50c and 90c according to elevation.

Rock excavation, 8481 cu. yd. at $2.00 where blasting was permitted, at $4.00 where blasting was prohibited.

Mass concrete, 2254 cu. yd. at $7.00, $7.50, and $8.00 according to mixture.

Cyclopean masonry, 38,008 cu. yd. at $5.00, $5.50, and $6.00.

Concrete blocks, 4844 cu. yd. at $11.50, $12,00, and $12.50.

Gate house superstructure, $1500.

Total cost of dam including engineering, approximately, $355,000.

Regarding expansion joints and leakage see page 117. Plums in the cyclopean masonry amounted to about 30 per cent.