whenever any mooring is installed, taken up, or relocated. On the reverse side of the form should be stated the original cost of the mooring, by items, and any other pertinent information not given elsewhere on the sheet.

14-122. Identification numbers. Moorings shall be marked with their official numbers, which shall be referred to in all correspondence and reports, in this style: "Mooring, Pearl Harbor, No. 5."

14-123. Moorings shall be shown on the annual report map and on the hydrographic surveys; if impracticable to include them within the areas of these plans, their location shall be indicated on a special plan or on official charts, and a copy thereof shall be forwarded to the bureau with the annual report.

SECTION VII. IDENTIFICATION NUMBERS FOR BUILDINGS AND OTHER STRUCTURES.

14-124. Numbers assigned by bureau. In order to preserve necessary identification records, the bureau assigns numbers to all buildings, also to other structures coming under its cognizance, including shipbuilding ways, dry docks, locomotives, cranes, floating derricks, moorings, and similar structures. Quarters are usually designated by single letters, except where additional identification letters are prefixed as hereinafter described. In the case of a new structure, application accompanied by the recommendation of the commanding officer of the station shall be made to this bureau, via any other bureau directly concerned, for the assignment of an identifying number or letter.

14-125. Designating letters prefixed to identify buildings bearing duplicate numbers. In cases where a separate group of buildings, such as a Marine post, hospital, or ammunition depot, located within the reservation boundary or other station limits, have been assigned identifying numbers which duplicate those assigned to other buildings on the station, an appropriate letter shall be prefixed to the number of each building in such group in order to establish definite identity. For buildings used for storage of ammunition and activities connected therewith, the letter "A" should be used; for buildings of a Marine post, the letter "M"; for buildings of a hospital, the letter "H".

14-126. Numbers not to be changed; old numbers not to be reassigned. These identifying numbers and letters assigned to

buildings and other structures will under no circumstances be changed. Even if the purpose or use of any building or structure be changed by authority other than this bureau's, its number shall not be changed or reassigned. The number carried by a building or structure which has been totally destroyed or otherwise disposed of will not again be assigned to a new structure.

SECTION VIII. DATA ON PUBLIC WORKS AND PUBLIC UTILITIES.

14-127. Purposes for which public works data are required. The bureau requires that permanent records be kept of all data relating to public works and public utilities, so far as essential for reference purposes. Such records shall be maintained by the district public works officer, except at a yard or station where there is a public works officer regularly assigned. The "Public Works Data Book," which is published by the bureau, includes important data on all public works and public utilities of the Navy (see Chapter 5); and since corrections and additions made from time to time are based on records maintained by the field organization, it is necessary that the officers concerned maintain such records with this purpose in view. It is necessary that data be recorded in such shape that they may also be available for revisions of the station's plant account, and for reference purposes in general.

14-128. Initial record sheets. Upon the completion of any public work or public utility there shall be prepared a record sheet which shall contain as a minimum the data listed hereinbelow. Where such record sheets are not on file for existing structures, they shall be prepared at the earliest opportunity. Data to be shown, when available, are:

Identifying number, name, and location of public work or utility.

Date of completion.

Contract number.

Name of contractor or manufacturer.

Cost of original structure and permanent fixtures.

Cost of all extensions, improvements, and other title E work.

Materials of construction for component parts.

Dimensions.

Services (brief description showing kinds of services and type of installation). Appliances and equipment (description, location, capacity).

Designed performance requirement of structure or parts thereof, including floor loads.

Test loads applied on acceptance,

Key sketches, if appropriate and desirable, showing structural framing or other construction.

Contractor's warranties, with dates of expiration.

Events in construction history likely to have future importance.

Supplemental statement of total repair costs, arranged by fiscal years; important repair jobs, with costs, to be indicated separately.

Cost to duplicate structure.

Deterioration: Rate and money value.

Present value.

Other pertinent data for revising station plant account or Public Works Data Book.

Space should be left for entering title E work as accomplished. A yearly statement of job orders under title G should be made on a separate sheet and filed with the record sheet. (See above.) (See above.) When properly kept, these records should prove a source of ready and reliable information, and their use should result in a considerable saving of time in bringing up to date the plant account and data book.

14-129. Duplicates for bureau. Duplicates of the original data sheet shall be furnished the bureau. For buildings, Y&D form 115 is to be used, supplemented if necessary by additional sheets of the same size; for other structures, a sheet of the same dimensions, or capable of being folded once to the same dimension, should be used. For passenger automobiles, motor trucks, cycles, and tractors, locomotives, locomotive cranes, and traveling cranes, Y&D forms 152 to 158, inclusive, are applicable and shall be used. Duplicates of supplemental statements of repair jobs (par. 14-128) should be forwarded to the bureau with the report of annual inspection.

14-130. General rules for data book records. In order to obtain the desired uniformity in accumulating and recording data, certain general rules are given hereinafter for cases where the procedure in obtaining the required data is not self-evident.

(a) General information and physical characteristics of shore establishments (Public Works of the Navy, Data Book, Part I):

The monthly average temperature and rainfall should, if possible, be obtained from the local weather bureau station's records extending over a long period of years; otherwise, cumulative averages should be determined from the records maintained by the navy yard or station.

Data as to tidal variations should be obtained by station observations, preferably by means of automatic recording tide gauges.

(b) Buildings and other structures (Public Works of the Navy, Data Book, Part IV):

Designation should indicate the official number and the purpose for which used, e. g., No. 184—Pattern shop.

Foundation should indicate the general type of the substructure, e. g., concrete on wood piles.

Superstructure.—The record should show the principal construction materials used, e. g., steel and brick.

Roof. The entry should indicate the type of covering and also the kind of slab or sheathing, e. g., tar and gravel, gypsum slab.

Length and width.-Enter the outside dimensions of rectangular buildings, or the extreme dimensions of the most important parts of irregular buildings.

Number of stories.-Count usable attic spaces as half stories. Do not count basements unless above grade.

Height eaves is the distance from the underside of the framing of the ground floor to the intersection of the plane of the roof with the plane of the side of the building. Floor space should show the gross inside area, no deductions being made for interior partitions, stairs, or elevator wells. Main floors, mezzanines, basements, and porch floors should be included.

Cubic space.-Indicates the gross volume of the structure above the lowest (or basement) floor, including porches.

Built means the year in which completed.

Cost.-Enter the first cost, if available.

Additions should show cost of all additions or other title E work since original completion.

Cost to duplicate is the estimated cost of duplicating, at current prices, the original structure and all additions.

Deterioration.-Initial record sheet should show annual rate or formula assumed. Entry in data book should be in money value.

Present value is the cost to duplicate, less deterioration.

14-131. Data for other fixed structures, such as shipbuilding ways, piers, sea walls, pavements, and distribution systems, not elsewhere listed in the data book, should be recorded in the same general arrangement as for buildings; such data should be inserted. in Part IV of the data book following the complete list of buildings. SECTION IX. RECORDS OF COMPUTATIONS AND ESTIMATES.

14-132. Design computations. In order to preserve a record of all sketches and computations entering into the design of public works and public utilities, such work shall be set down only in books issued for this specific purpose. At the front of each book the contents must be indexed, and designers shall be required to keep the index up to date. All books or binders containing such computation data shall be carefully filed where they will be preserved and at all times available for reference.

14-133. Estimate files. All estimates covering proposed construction work or for any other purpose shall be prepared in such manner that the source of the estimate and any assumptions or calculations entering into it can be readily ascertained. Estimates should be preserved in such form that they may be available for comparison with actual costs and expenditures, and for use in connection with similar work at a later date.

14-134. The bureau's practice in regard to estimates for proposed construction work is to have schedules of material prepared by the drafting force, a record thereof being filed in the computation book used for the project. Project managers are responsible for preparing cost estimates, and the gross estimate for any project is placed on the specification routing slip, which is filed in the specification section. Estimates submitted by yards and stations for new or repair work are filed in the bureau's correspondence files.

14–135. At yards and stations, the procedure for preparing and recording estimates for repairs and new construction work necessarily varies through wide limits, depending on the organization and local practices obtaining. The bureau is only incidentally interested in the method followed, which is primarily a matter of local determination, but directs the attention of all concerned to its requirement that cost estimates be prepared before construction or repair work is undertaken. (See par. 17-03.)

14-136. Project managers' record of progress of new work. Project managers are required to keep a list of all projects of new construction assigned them, and to maintain a progress record, so that information as to the status of any project may be available at all times.