supplies, and do all things necessary for the construction and completion of the following work:

in accordance with the drawings and specifications to be furnished by the Contracting Officer, and subject in every detail to his supervision, direction, and instruction.

The Contracting Officer may, from time to time, by written instructions or drawings issued to the Contractor, make changes in said drawings and specifications, issue additional instructions, require additional work, or direct the omission of work previously ordered, and the provisions of this contract shall apply to all such changes, modifications, and additions with the same effect as if they were embodied in the original drawings and specifications. The Contractor shall comply with all such written instructions or drawings.

The title to all work completed or in course of construction shall be in the United States; and upon delivery at the site of the work, and upon inspection and acceptance in writing by the Contracting Officer, all machinery, equipment, hand tools, supplies and materials for which the Contractor shall be entitled to be reimbursed under paragraph (a) of Article II hereof, shall become the property of the United States. These provisions as to title shall not operate to relieve the Contractor from any duties imposed hereby or by the Contracting Officer.

Article II. Cost of the Work

The Contractor shall be reimbursed in the manner hereinafter described for such of its actual net expenditures in the performance of said work as may be approved or ratified by the Contracting Officer and as are included in the following items:

(a) All labor, material, machinery, hand tools, not owned by the workmen, supplies, and equipment necessary for either temporary or permanent use for the benefit of said work; but this shall not be construed to cover machinery or equipment mentioned in section (c) of this article. The Contractor shall

make no departure from the standard rate of wages being paid in the locality where said work is being done without the prior consent and approval of the Contracting Officer.

(b) All sub-contracts made in accordance with the provisions of this agreement.

(c) Rental actually paid by the Contractor at rates not to exceed those mentioned in the schedule of rental rates hereto attached for construction plant in sound and workable condition, such as pumps, derricks, concrete mixers, boilers, clamshell or other buckets, electric motors, electric drills, electric hammers, electric hoists, steam shovels, locomotive cranes, power saws, engineers' levels and transits, and such other equipment as may be necessary for the proper and economical prosecution of the work.

Rental to the Contractor for such construction plant or parts thereof as it may own and furnish, at the rates mentioned in the schedule of rental rates hereto attached, except as hereinafter set forth. When such construction plant or any part thereof shall arrive at the site of the work the Contractor shall file with the Contracting Officer a schedule setting forth the fair valuation at that time of each part of such construction plant. Such valuation shall be deemed final, unless the Contracting Officer shall, within five days after the machinery has been set up and is working, modify or change such valuation, in which event the valuation so made by the Contracting Officer shall be deemed final. When and if the total rental paid to the Contractor for any such part shall equal the valuation thereof, no further rental therefor shall be paid to the Contractor, and title thereto shall vest in the United States. At the completion of the work the Contracting Officer may at his option purchase for the United States any part of such construction plant then owned by the Contractor by paying to the Contractor the difference between the valuation of such part or parts and the total rentals theretofore paid therefor.

Rates of rental as substitutes for such scheduled rental rates may be agreed upon in writing between the Contractor and the Contracting Officer, such rates to be in conformity with rates of rental charged in the particular territory in which the work covered by this contract is to be performed. If the Contracting

Officer shall furnish or supply any such equipment, the Contractor shall not be allowed any rental therefor and shall receive no fee for the use of such equipment.

(d) Loading and unloading such construction plant the transportation thereof to and from the place or places where it is to be used in connection with said work, subject to the provisions hereinafter set forth, the installation and dismantling thereof, and ordinary repairs and replacements during its use in the said work.

(e) Transportation and expenses to and from the work of the necessary field forces for the economical and successful prosecution of the work, procuring labor, and expediting the production and transportation of material and equipment.

(f) Salaries of resident engineers, superintendents, timekeepers, foremen and other employees at the field offices of the Contractor in connection with said work. In case the full time of any field employees of the Contractor is not applied to said work but is divided between said work and other work, his salary shall be included in this item only in proportion to the actual time applied to this work.

(g) Buildings and equipment required or necessary field offices, commissary, and hospital, and the cost of maintaining and operating said offices, commissary, and hospital, including such minor expenses as telegrams, telephone service, expressage, postage, etc.

(h) Such bonds, fire, public liability, employers' liability, workmen's compensation, and other insurance as the Contracting Officer may approve or require, and such losses and expenses not compensated by insurance or otherwise, as are found and certified by the Contracting Officer to have been actually sustained (including settlements made with the written consent and approval of the Contracting Officer) by the Contractor in connection with said work, and to have clearly resulted from causes other than the fault or neglect of the contractor. Such losses and expenses shall not be included in the cost of the work for the purpose of determining the Contractor's fee. The cost of reconstructing and replacing any of the work destroyed or damaged shall be included in the cost of the work for the purpose of reimbursement to the Contractor,

but not for the purpose of determining the Contractor's fee, except as hereinafter provided.

(i) Permit fees, deposits, royalties, and other similar items of expense incidental to the execution of this contract, and necessarily incurred. Expenditures under this item must be approved in advance by the Contracting Officer.

(j) Such proportion of the transportation, traveling, and hotel expenses of officers, engineers, and other employees of the Contractor as is actually incurred in connection with this work.

(k) Such other items as should in the opinion of the Contracting Officer be included in the cost of the work. When such an item is allowed by the Contracting Officer it shall be specifically certified as being allowed under this paragraph.

The United States reserves the right to pay directly to common carriers any or all freight charges on materials of all kinds and machinery furnished under this contract and certified by the Contracting Officer as being for installation or for consumption in the course of the work hereunder; the Contractor shall be reimbursed for such freight charges of this character as it shall pay and as shall be specifically certified by the Contracting Officer; but the Contractor shall have no fee based on such expenditures. Freight charges paid by the Contractor for transportation of construction, equipment, construction plant, tools, and supplies of every character shall be treated as part of the cost of the work upon which the Contractor's fee shall be based, provided that charges for transportation of such construction equipment, construction plant, and tools over distances in excess of 500 miles shall require the special approval of the Contracting Officer.

No salaries of the Contractor's executive officers, no part of the expense incurred in conducting the Contractor's main office, or regularly established branch office, and no overhead expenses of any kind, except as specifically listed above, shall be included in the cost of the work; nor shall any interest on capital employed or on borrowed money be included in the cost of the work.

The Contractor shall take advantage to the extent of its ability of all discounts available, and when unable to take such

advantage shall promptly notify the Contracting Officer of its inability and its reasons therefor.

All revenue from the operations of the commissary, hospital, or other facilities or from rebates, refunds, etc., shall be accounted for by the Contractor and applied in reduction of the cost of the work.

Article III. Determination of Fee

As full compensation for the services of the Contractor, including profit and all general overhead expense, except as herein specifically provided, the Contracting Officer shall pay to the Contractor in the manner hereinafter prescribed a fee to be determined at the time of completion of the work from the following schedule, except as hereinafter otherwise provided:

Provided, however, That the fee upon such part of the cost of the work as is represented by payments to sub-contractors, under subdivision (b) of Article II hereof, shall in each of the above contingencies be 211⁄2 per cent and no more of the amount of such part of the cost.

The cost of materials purchased or furnished by the Contracting Officer for said work, exclusive of all freight charges thereon, shall be included in the cost of the work for the purpose of reckoning such fee to the Contractor, but for no other purpose.

The fee for reconstructing and replacing any of the work destroyed or damaged shall be such percentage of the cost thereof-not exceeding 7 per cent-as the Contracting Officer may determine.

The total fee to the contractor hereunder shall in no event exceed the sum of... anything in this agreement to the

contrary notwithstanding.

Article IV. Payments

On or about the 7th day of each month the Contracting Officer and the Contractor shall prepare a statement showing as completely as possible: (1) The cost of the work up to an