This bridge is 270 feet 64 inches long, 5 feet wide, 35 feet 5 inches high. It contains 33 tons of steel, 64 cubic yards of concrete. It has a wooden box to carry pipes. This box is 3 feet inches high by 4 feet 4 inches wide, with 4-inch inclosed air space

all around.

DATA ON CONTRACT NO. 3.- MAIN BRIDGE.

Contract No. 3, for main bridge, was awarded to Mr. Wallace Marshall, La Fayette, Ind.

Contract executed July 19, 1906.

Consideration.-The contract price for main bridge was $27,967; extras, 3.68 cubic yards of concrete where spring softened pier base, at $9 per cubic yard=$33.12. Time limit.-Time limit for completion, six calendar months, or until January 19,

1907.

Extensions.-Application for extension of time to June 1, 1907, submitted on January 8, 1907; bureau indorsement of January 8, 1907, stated question of extension would not be considered until completion.

Application for extension of time to July 15, 1907, submitted to bureau on April 24, 907.

Application for extension of time to August 15, 1907, submitted June 20, 1907. Application for extension of time to September 1, 1907, submitted August 13, 1907. Progress. Work started October 1, 1906; work was completed on August 28, 1907. Description of work.--This bridge is on main entrance to grounds, and on axis of administration building tower. It is a plate girder bridge with reenforced concrete floor, walks, and panels. The roadway is macadam. The abutments are of concrete, with ornamental concrete railing and curved wing walls. The macadam was rolled with a 7-ton roller.

Length of bridge between abutments.

Width of roadway..

Two sidewalks, each 8 feet wide.

Total width.

Height at center....

Bridge contains 180 tons of steel and 892.68 cubic yards of concrete.

Feet.

180

30

16

46

37

This bridge has a wooden conduit under roadway to carry sewer, water, and heating mains.

Contract No. 4, for water-supply mains, was awarded to Mr. T. H. Iglehart, Morgan Park, Ill.

Contract executed August 8, 1906.

Consideration. The contract price for water-supply mains was $18,674. Extras: Changes to lower grade of pipe at boathouse; cost, $247.83.

Time limit. Time limit for completion, eighty days, or until November 8, 1906. Extensions. Application for extension of time to May 15, 1907, submitted October 15, 1906; bureau letter of October 27, 1906, granted extension to three weeks beyond date of notification by commandant that bridges were ready to receive water pipe. Application for extension of time of fifteen days from July 29, 1907, submitted on July 24, 1907; bureau letter of July 30, 1907, granted extension of time to August 13, 1907.

Application for extension of time to August 28, 1907, submitted on August 12, 1907; bureau letter of August 14, 1907, granted extension of time to August 28, 1907.

Progress. Work started September 13, 1906; work completed August 28, 1907. Description of work. --- These mains cover the large plateau on the northeast and have a branch to the northwest and southeast plateaus across the two bridges. They ordinarily will have only the standpipe pressure, which will be 40 pounds on the plateau and 70 pounds at the power house. The fire pressure will be 150 pounds, and the mains are designed to supply six fire streams at any portion of the grounds, which will throw streams over any building. Mains are tested to 200 pounds pressure per square inch before trenches are backfilled. Depth below ground is 5 feet. The following pipe is included:

12-inch mains..

Feet.

1,038

There are 36 hydrants and 25 valves. Service branches are included.

DATA ON CONTRACT NO. 5.-OFFICERS' QUARTERS.

Contract No. 5, for four houses for officers' quarters, was awarded to Mr. Harry E. Overstreet, 712 Marquette Building, Chicago, III.

Contract executed October 25, 1906.

Consideration. The contract price for four houses for officers' quarters was $54,000;

no extras.

Time limit.--Time limit for completion, six calendar months, or until April 25, 1907. Extensions.-Application for extension of time with permission to delay work until spring, submitted on December 6, 1906; bureau letter of December 15, 1906, granted permission to delay work until such time as favorable weather conditions might be had in the spring, question of time to be considered on completion of work. Application for extension of time to August 1, 1907, submitted on March 22, 1907; bureau letter of March 26, 1907, granted extension of time to July 20, 1907.

Progress. Work started October 12, 1906; work stopped January 29, 1907. Work resumed May 1, 1907; work abandoned July 8, 1907. Up until the time of his abandonment of the work, H. E. Overstreet, the contractor, had performed 23 per cent of the work covered by this contract, or work to the value of $11,548.71. Payments.--Payments on account, as follows, have been made to the former contractor, Mr. Harry E. Overstreet:

Description of work.- For sizes of these buildings, see data on buildings (10). These are double-faced houses to give front on roadway and front on lake. There is a veranda on road side and a terrace on lake side. They have a basement, first and second stories, and a low attic. On first floor is large hallway, living room, dining room, pantry, kitchen, and toilet. The second floor has four sleeping rooms and two baths, with closets in all bedrooms and linen closet in hall. In the attic is one servant's room and servant's bath, and the remainder is used for storage room.

Readvertisement of contract. The Bureau of Navigation readvertised this work for completion. Bids were opened August 26, 1907, and contract let to James E. Hale, of North Chicago, Ill., for $55,689, on September 20, 1907. (See Contract No. 10.)

DATA ON CONTRACT NO. 6.-TIMBER CRIB SEA WALL AROUND SITE OF THE POWER HOUSE.

Contract No. 6, for timber crib sea wall around site of power house, was awarded to Mr. James E. Hale, Commonwealth avenue, North Chicago, Ill.

Contract executed March 27, 1907.

Consideration. The contract price for this work was $12,950; no extras.

Time limit.-Time limit for completion, four calendar months, or until July 27, 1907.

Extensions.-July 15, 1907, application for extension of time for thirty days from July 27, 1907, submitted; July 26, 1907, bureau granted extension of thirty days from July 27, 1907.

August 21, 1907, application for extension of time for thirty days from August 27. 1907, submitted; August 29, 1907, bureau granted extension of time to September 27, 1907.

September 25, 1907, application for extension of time for thirty days from September 27, 1907, submitted; October 2, 1907, bureau granted extension of thirty days from September 27, 1907.

October 26, 1907, application for extension of time for thirty days from October 27, 1907, submitted; October 31, 1907, bureau granted extension of thirty days from October 27, 1907.

Progress.--Work was started April 3, 1907; work was completed on September 27,

1907.

NOTE.--The discrepancy between date of extension and acceptance of the work was caused by the fact that though work was completed on time it was not accepted on account of the probability of settling during winter.

Description of work. This work consists of a timber crib extending east and west from a point about 3 feet south of our north line on the beach and running about 140 feet from foot of bluff, thence due south about 400 feet. The depth of water is 5 to 6 feet along the face; the height of crib above water level is 6 feet. The width at bottom is 8 feet for east and west crib, and 9 feet for north and south crib; the width at top is 6 feet. Round timbers are used for lower work, backing, and cross-ties. The face timbers are 8 by 10 inch squared timber. The crib is filled with quarry-run riprap. Piles on face are spaced 10 feet centers with clusters at corners. The face on north and east is riprapped on outside to a depth of 2 feet below water line. The crib has a decking of 3-inch plank. This timber crib is designed to make a site for the location of power house and filtration beds. It will be filled in back with sand to a depth of 24 feet above water level and then turned over to the contractor for the power house.

DATA ON CONTRACT NO. 7.-WATER-SUPPLY MAINS EXTENSION.

Contract No. 7, for water-supply mains extension, was awarded to Mr. Harry C. Patterson, Waukegan, Ill.

Contract executed May 17, 1907.

Consideration. The contract price for this work was $6,300. Extra, one hydrant for blowout at bottom of ravine; cost, $55.

Time limit.-Time limit for completion, three calendar months, or until August 17, 1907.

Extensions.-Application for extension of time for thirty days submitted on July 24, 1907; bureau letter of July 30, 1907, granted extension of time to September 17, 1907.

Application for extension of time to October 16, 1907, submitted September 3, 1907; bureau letter of September 14, 1907, granted extension of time to October 16, 1907. Progress-Work started May 21, 1907; work on this contract was accepted on October 10, 1907.

Description of work. These mains are placed on the southwest plateau with a connection under ravine to mains on the northeast plateau. They were not included with original mains, as at that time it was not intended to use the southwest plateau for the receiving group. They are subject to same pressures as for other mains. There is an 8-inch loop around parade. The depth below grade is 6 feet.

The following pipe is included:

There are 6 hydrants and 23 valves. Service branches are included.

DATA ON CONTRACT NO. 8.-TEN PRINCIPAL BUILDINGS.

Contract No. 8 for 10 principal buildings was awarded to the Noel Construction Company, Baltimore, Md.

Contract executed May 31, 1907.

Consideration. The contract price for this work was $1,500,000. Supplemental agreement No. 1 reduced cost by $7,884.88.

Time limit.--Time limit for completion, two years, or until May 31, 1909.

Progress. Work started June 10, 1907; work should be completed by July 1, 1910. Description of work. The 10 principal buildings are as follows: Administration building, instruction building, drill hall, four dormitories, mess hall, power house, main guardhouse.

See data on buildings for sizes. Bids on 24 buildings were opened May 1, 1907, and the lowest bid was that of the Noel Construction Company, for $2,137,986. The lowest bid on 10 principal buildings was that of the Noel Construction Company, for $1,585,910. The changes as mentioned in letter of the Noel Construction Company, of May 10, 1907, were agreed upon, and these reduced the cost of these 10 buildings to $1,500,000. Certain of the omitted items were furniture and fittings, which must be supplied later under the heading of furniture. It was decided by the Judge-Advocate-General that the architect's fee of 34 per cent was not included in the appropriation of $2,000,000 for these buildings, as this sum was for actual construction.

The original estimate of $2,000,000 for all buildings was correct. The reason the bids overran the estimate was due to the rapid advance in the cost of construction during the two years between the time of fixing these costs and the time of receiving bids.

Scale of offers on twenty-four buildings by the Noel Construction Company.

Statement showing changes made to reduce cost of ten principal buildings. Amount of bid of the Noel Construction Company, on ten buildings comprising the main plant, as follows: Administration building, instruction building, drill hall, mess hall and galley, main guardhouse, power house, four dormitories.....

Amount of original estimate submitted to Congress on ten buildings comprising the main plant..

Excess of bid of the Noel Construction Company over original esti-
mate submitted to Congress....

Deduct for work not contemplated in the original estimate, as follows:
Items J' to J (inclusive), J1o, and J15, electric-light fixtures...

$1,585, 910

1,500,000

85, 910

$21,000

Item K', shelving and dressers in mess hall and galley.
Item K, metal fence gates and hardware, main guardhouse.
Item L', driers in four dormitories....

2,550

650

1,260

10,000.

35, 460

50, 450

Item K', wire-mesh lockers in natatorium...

Net excess over original estimate...

With the elimination of the above specified work, the contractor agreed to reduce the cost of constructing the buildings comprising this group to the actual amount available ($1,500,000), provided the following changes in the specifications were agreed to by the Navy Department:

(a) Substitute first quality slate throughout where marble treads and platforms are specified.

(b) Substitute maple flooring throughout where oak flooring is specified. (c) Substitute selected black slate in all toilet rooms in lieu of marble.

(d) Omit marble wainscot in all corridors and halls and substitute Keene's cement finish; and omit marble and tile floors throughout corridors and toilet rooms and substitute terrazzo.

(e) Substitute Tennessee marble base wherever marble bases are specified, color to be selected by officer in charge.

(f) The finished hard wood for these buildings is to be selected by the officer in charge at a total cost of not exceeding $15,000.

(g) Omit two coats of paint on galvanized-iron piping in the heating system. (h) Omit pipe covering on return lines of heating system.

(i) The size of return pipes to be reduced to that used in regular practice, lay-out to be submitted to the officer in charge for approval.

(j) Omit tile conduit in drill hall and substitute concrete trench.

(k) Merchants' standard or other approved pipe to be used throughout in lieu of that specified.

(1) Omit valves on branch lines of steam pipe.

Progress.-The work on nine of the buildings in this contract is practically completed. On one building, the mess hall and galley, the driving of reenforced concrete piles for foundations was commenced on October 29, 1909, and has continued to date, about 50 per cent of the piles being driven. These piles are being driven between those now in place, the majority of which have been rejected. It is expected that this building will be completed by the time the hospital buildings are completed and the station placed in commission.

DATA ON CONTRACT NO. 9.-TWELVE ADDITIONAL BUILDINGS.

Contract No. 9, for twelve additional buildings, was awarded to the Northern Construction Company, Milwaukee, Wis.

Contract executed September 9, 1907.

Consideration. The contract price for this work was $370,000. Supplemental agreement reduced cost by $662.98.

Time limit. Time limit for completion, fifteen calendar months.

Extensions.-November 7, 1908, extension of time limit of one hundred and eighty days requested; November 23, 1908, extension to April 9, 1909, granted by bureau Progress.-Work started September 7, 1907; work completed July 30, 1909.

Description of work. The twelve additional buildings are as follows: General store. keeper's storehouse, brig, stable, boathouse, receiving building, six receiving dormitories, receiving galley.