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area considered essential to the project from a Reclamation standpoint. A total of 7,025 of the claims were invalid either by acquiescence on the part of the owners or through contest hearing procedures. Total cost to the Bureau for the BLM investigation work in the Glen Canyon withdrawal area was $384,207.00.

The total acreage acquired from private interests is 763.54 acres representing a payment of $107,905. The area for which condemnation was initiated is 176.39 acres at an estimated combined value of $13,315. Land acquired from the State of Utah, by court action, comprised 10,039 acres at a cost of $125,000. There were 1,177,610 acres withdrawn from public lands which include property acquired under Public Law 85-868 (72 Stat. 1686) (51,606.78 acres) from the Navajo Indians as shown below.

Under Public Law 85-868 (72 Stat. 1686), an Act "to provide for the exchange of lands between the United States and Navajo Tribe," 51,606.78 acres were acquired from the Navajo Indians in exchange for which the Navajos received virtually the same acreage on McCracken Mesa in Utah. As provided by said Act, these exchanged lands have the status of ordinary Reclamation-withdrawn public lands. In connection with the exchange, the grazing permittees and owners of range improvements on the McCracken Mesa public lands were compensated by the Bureau for their permits which were canceled to accommodate the exchange at a total cost of $144,000.00. In addition, the BLM, through agreement with the Bureau of Reclamation and on a reimbursable basis, investigated the mining claims on the Mesa; a considerable number of claims were involved but all were finally determined to be invalid. The BLM was reimbursed $29,678.58 by the Bureau of Reclamation for this work. Approximately 30 individual Indian owners of improvements on the 51,606.78 acres of Tribal lands acquired under P. L. 85-868 were compensated for their improvements at a total cost to the Bureau of $11,840.00.

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Altogether the acreages amount to 1,188,588.93 at a total acquisition cost of $1,252,721. The final total cost will change consonant with the outcome of the ensuing litigation.

143. LAND FOR ESTABLISHMENT OF THE CITY OF PAGE. Public Law 85-868, September 2, 1958, transferred to the United States all the right, title, and interest of the Navajo Tribe in and to certain lands required for the Colorado River Storage project, including the land required for the establishment of a city for construction and operation and maintenance purposes, named Page, Ariz.

Prior to the enactment of P. L. 85-868, land at Page could be made available for private use only on a lease basis under Section 10 of the Reclamation Project Act of 1939. Public Law 85-868 authorized the Secretary to dispose of lots in townsites established on the lands transferred under P. L. 85-868 under such terms and conditions as he determined appropriate, but at not less than the current fair market value, except for dedication of lands for public purposes. Subsequent to the enactment of P. L. 85-868, lots at Page, Ariz., have been sold at appraised values determined by FHA and

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E. CONSTRUCTION SUPPORT FACILITIES

145. REFERENCE. The construction support facilities for construction of the Glen Canyon complex were many and varied. Certain of these facilities, such as service, municipal, housing, and public use, will not be discussed in this publication. Information on the above listed facilities is included in the final construction report, an unpublished internal document (see appendix H).

146. CONSTRUCTION PLANT-GENERAL. The prime contractor, Merritt-Chapman and Scott Corp., obtained a large amount of equipment for a plant to construct Glen Canyon Dam and Powerplant. The largest portion of this plant was for concrete production facilities, which included an aggregate processing plant, a concrete mixing plant, a cooling plant, and cement and pozzolan storage. Some of the major items of other construction support facilities were traveling cableways, a temporary powerplant, monkey slides and footbridges, and carpentry, reinforcing steel, and office and equipment repair shop areas. In addition, the contractor provided housing facilities for employees, such as trailer courts, barracks, apartments and houses, as well as concessions and messhalls.

Some of the points of special interest in the contractor's construction plant were 12-cubic-yard concrete placing buckets transported by high-speed, 50-ton traveling cableways, a vertically arranged batching plant 217 feet high, a large refrigeration plant for concrete and aggregate cooling, and an aggregate processing plant which incorporated heavy media separation. Operations and further details of the major plant items are included in the description of the construction of the appropriate project features in this publication.

In accordance with contract provisions, payment in the amount of $4,500,000 for preparatory work was advanced to the contractor for the special plant and equipment necessary for processing, conveying and storing of aggregates; storing cement and pozzolan; batching, mixing, and transporting concrete; concrete and aggregate cooling plants; cableway structures and cableways for river crossings, or other equipment employed to place concrete. Subsequent repayment of the above amount to the Government was made by deducting $1.25 per cubic yard from payments made to the contractor for mass concrete in the dam.

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Figure 245.-Aerial view of aggregate processing plant on ledge above Wahweap Creek. P557-420-5568, December 14, 1960.

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Finished stockpiles at the aggregate plant consisted of eight stockpiles of the following maximum sizes; 6-inch, 3-inch, 1-1/2-inch, 3/4-inch, 3/4-inch heavy-media-treated, 1-1/2-inch heavy-media-treated, graded natural sand, and graded heavy-media-treated sand. Larger stockpiles in three finished sizes were also provided at the construction site, and the material was delivered to the batching plant by way of conveyor belts in a reclaiming tunnel underneath the piles.

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MIXING PLANT. The main concrete batching and mixing plant (fig. 246) for construction of Glen Canyon Dam and Powerplant was designed by by the Noble Co. of

Oakland, Calif. This plant was designed to produce concrete at an average rate of 420 cubic yards per hour, or a maximum rate of 480 yards per hour for short periods of time, using automation as far as possible.

The

octagon-shaped mixing plant had six main floors, served by

an exterior man-lift, and was 217

feet high. Large 3,000-ton-capacity

aggregate storage bins, containing eight bin compartments

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installation of 6,275 horsepower was required. The plant included a battery of 18 ammonia compressors, eight 48-inch condensors, and a cooling tower, which were

supplemented by 10 shell and tube chillers. Fourteen of

the 18 compressors were arranged for multipurpose use as follows: eight 600-horsepower, one 450-horsepower, two 150-horsepower, two 100-horsepower, and a 25-horsepower

compressor.

The other four 125-horsepower compressors were used for the 22 "shaved" ice-making machines. Two of the shell and tube chillers were 32 inches in diameter and were used to chill the mixing water, three 52-inch units chilled water for cooling the coarse aggregate on the conveyor belt, and the other five cooled circulating water for the cooling pipes and the dam and were 38 inches in diameter.

Figure 246.-Concrete batching plant being set up on west rim of Glen
Canyon. P557-420-4781, April 29, 1960.

for two types of sand and the six sizes of coarse aggregate, were located in the middle of the plant. The screening tower and chutes were located in the portion of the plant above the storage bin, and the batching and concrete mixing floors were located below the storage bin. On the mixer floors, six tilting mixers were installed in a circular pattern, each having a capacity of 4 cubic yards. The mixers were discharged into three separate holding hoppers, which in turn were loaded into 12-cubic yard ladle buckets on electric-driven a trestle below the plant. The transfer trains on primary economic reason for locating the mixing plant on the bench at elevation 3540 was that over 80 percent of all concrete would be placed by cableways to areas below this elevation.

Seven silos were provided to store bulk cement and pozzolan and were located on the canyon rim, above the batching plant. Each of the four cement silos had a capacity of 10,000 barrels of cement and each of three pozzolan silos held 1,000 tons, a capacity of 40,000 cubic feet. Both cement and pozzolan were delivered to the site in special trailers, which were bottom dumped into a screw conveyor which lifted the materials to air slides and transported it to the silos. The mixing plant received both cement and pozzolan

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by screw conveyors from the bottom of the silos, and the cementing materials were transported by air slides to balancing storage at the batching plant. Bulk storage tanks for calcium chloride solution, air entraining agent, and liquid water reducing agent were located on the canyon rim adjacent to the plant, and were piped for gravity flow to the batching floor.

150. CABLEWAYS. Two 50-ton-capacity cableways were used for placing concrete in the dam. The cableways were equipped with moving head and tail towers set on two sets of parallel tracks. One of the cableways had higher towers to enable it to cross over the other cableway so that each could be operated independently and simultaneously. This cableway system was designed for the contractor by Lidgerwood Industries and was the largest of this type ever used in dam construction. A used, low 25-ton cableway was erected and placed in operation later, primarily for powerplant use in concrete placement, and subsequently for use as a general service crane.

The higher of the two 50-ton cableways had a cable span of 2,050 feet between the head tower and the tail tower. The lower 50-ton cableway had a span of 1,800 feet between towers, both load-carrying cables being 4-inch lock coils. These two cableways were designed for a normal capacity of 31 tons at a normal operating speed and condition, and up to 50 tons each at a reduced speed and greater main cable sag. The vertical velocity of the fall block with a hook load of 31 tons was 600 feet per minute, and about half this velocity at full load. Further details of the cableways, as well as operations, are included in section 174.

concrete placed until the full amount of the advancement had been returned. By an amendatory agreement to the supplemental agreement, the power was delivered in the service area of Page, Ariz., rather than at the contractor's generator-plant switchyard adjacent to the temporary generator plant. The Government paid $33,125.46 or 51.546 percent of the cost of the transmission line and other facilities.

151. TEMPORARY POWERPLANT. Under a supplemental agreement, the prime contractor furnished electrical energy for construction and for the townsite. A temporary powerplant was built on the right abutment which initially initially housed four 1,360-kilowatt electric generators. Ten diesel powered generators of 1,100-kilowatt capacity each were added later, for a total rated plant capacity of 16,440 kilowatts.

Under invitation No. 400S-97, Arizona Public Service Co. constructed, owned, and maintained all of the distribution facilities, including a street lighting system, required for the purpose of furnishing electric service in the Government areas of Page, Ariz. Power and energy required for such electric service was furnished by the Government through purchase from the prime contractor. Arizona Public Service Co. constructed a 69-kilovolt transmission line from Cameron, Ariz., to Page and the line was energized on the weekend of April 22, 1961. Electric energy for both the townsite and the construction work was thereafter supplied through this line. At the end of construction of the Glen Canyon unit the contractor dismantled the temporary powerplant.

Under the specifications, the Government was to furnish electric power for construction purposes to the contractor at the rate of 15 mills per kilowatt-hour. Under the supplemental agreement, the contractor provided power for his own construction purposes and would also furnish up to 3,000 kilowatts to the Government at the rate of 13.5 mills per kilowatt-hour, subject to adjustment, and the Government advanced $2,100,000 to the contractor which was to be repaid by deduction of 50 cents per cubic yard for mass

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152. OTHER CONSTRUCTION SUPPORT FACILITIES. The contractor also constructed number of other buildings for use as office, shop, and storage facilities for the various construction needs. These buildings were generally made of the "Butler-type" construction with steel panels on structural steel bents and concrete floors. These buildings were used for the office space, equipment repair shops, and service shops, which were located on the west side of the river; and for the warehousing, electrical, plumbing, carpentry, and reinforcing steel bending shops on the east side of the river. Many miles of access roadways and large areas were graded and gravel surfaced for transporting, handling, and storage of equipment and materials on both sides of the canyon. In addition, the contractor constructed a large number of small buildings, usually corrugated metal on wood frames, for use as small field offices and tool rooms. These buildings were usually constructed so that they could be moved by cableway or mobile crane to various locations about the work. Small powder shelters were also provided a safe distance from the construction site on the west side of the canyon. First aid facilities were provided at appropriate locations, including fully equipped trailers on each side of the worksite, as discussed further under the section of this report on safety matters.

A steel-cable suspension-type footbridge (fig. 247) was constructed in October 1957, which spanned the canyon from the top of the canyon walls upstream

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