Appendix_D.pdf

SECTION 18000

ENGINEERING GRAPHICS

PART 1 - GENERAL

1.01 DESCRIPTION OF WORK: This specification covers the creation of Construction Contract design drawings, prior to construction, and the creation & submittal of As-Built drawings to the Government when construction is complete.

1.02 GENERAL REQUIREMENTS:

A. All projects with more than 4 drawing sheets shall include a Drawing Index.

B. Drafting Standards for Construction Documents:

1. Files - Each sheet in the set of drawings for a project shall be a separate electronic drawing file. See the drawing numbering description later in this document for the explanation of the RIA drawing numbering system. The current CADD software used by USAG-RIA DPW is Microstation, version 8 from Bentley Systems, Inc. Each Microstation CADD file created shall be 2 dimensional (2D) in structure; 3D files are not to be used unless specifically noted otherwise by the Government, in writing. The “Default” model, also known as the “Master Model” is to be the only CADD work environment used in each computer drawing file. The use of “sheet file/paper space” file partitioning is not allowed.

2. Size - Drawing size shall be 28" x 40" (ANSI Size F) unless specifically noted otherwise, in writing, by the Government..

3. Working Units - Working units for all electronic drawing files shall be 1:12:320 (feet: inches: parts per inch), except for civil engineering projects which shall be 1:10:100 (feet: tenths of a foot: parts per tenth).

4. Foundation Files - A group of base electronic files (DPW standard borders, floor plans, site maps, details, etc.) used to create the necessary electronic drawing files will be provided to the Contractor after Contract award.

5. Drawing Scale – Electronic drawings shall be made true to scale in the computer. The DPW plotter plots the image on the screen at 1/12 of its scale. For example: When a border and title block is created at 1/4" = 1'-0", the border will scale 160 feet x 112 feet in the computer. When this sheet is plotted at 1/4" = 1'-0", the border will be 40 inches x 28 inches. This relationship applies for any scale used to create a drawing.

6. Graphic Scale - Each electronic drawing file shall have a graphic scale placed for each view shown on the drawing. Each graphic scale used should be labeled “Scale in Feet” to make the scale usable for the drawing to be printed at different sizes.

7. Lettering - A minimum lettering height of 0.125" is required for general text. Subtitles shall be a minimum of 0.1875" and titles shall be a minimum of 0.25". Microstation text font 0 or font 3 shall be used. All capital letters shall be used for all text.

8. Linework - Linework and lettering shall be sharp and crisp to withstand reproduction and reduction without image fadeout. Generally, new work is shown at line weight 3 and existing features are line weight 0. Items to be demolished are shown as dashed lines.

9. Legends and Symbols - Appropriate legends shall be included with each drawing set. Symbols used shall conform to discipline standards, e.g. Architectural Graphic Standards, ASHRAE, etc.

10. Patterning - Use (Microstation) solid line patterns such as hatching, crosshatching, or dots similar to zip-a-tone.

11. Levels/Layers/Colors - In plan view, distinct elements of each drawing shall be put on levels/layers according to the USAG-RIA DPW format. See the description of levels later in this document for the required format. For data not in plan views (details, one-line diagrams, etc.), the levels and colors are left to the discretion of the user. Open levels are commonly used for these items.

12. Labels and Titles - All electronic drawing files shall have a north arrow, if applicable, and title. North should be oriented to the top of the page. The project number assigned to the project by USAG-RIA

DPW and date shall be on the electronic drawings. A drawing number (drawing #) shall be assigned to the project by USAG-RIA DPW.

C. Electronic Drawing Sheet - File Naming Standard:

1. The electronic drawing file naming Standard used shall be in accordance with the National CADD

Standard (NCS),ver 5 or latest version, which is supported by the AEC CADD Standard published by the US Army Corps of Engineers (USACE) BIM Center, Vicksburg, MS. This is the adopted standard of USAG-RIA DPW.

D. Electronic Drawing Sheet - Layers/Levels Naming Standard:

1. The electronic drawing file layers/levels naming Standard used shall be in accordance with the

National CADD Standard (NCS),ver 5 or latest version, which is supported by the AEC CADD

Standard published by the US Army Corps of Engineers (USACE) BIM Center, Vicksburg, MS.

This is the adopted standard of USAG-RIA DPW.

1.03.1.1 PROJECT AS-BUILTS/RECORD DRAWINGS:

A. Hardcopy and electronic As-Built/Record drawings shall be provided by the Contractor for all projects.

The electronic As-Built/Record drawing files shall be provided in Bentley MicroStation format and shall be in accordance with the USAG-RIA DPW CADD Standard in use. The electronic As-Built/Record drawings shall also be provided in Adobe Acrobat format. Printed hardcopy drawing sets shall be supplied on full-sized, 4-mil, double-matte Mylar drawing sheets.

B. As-Built/Record Drawing creation and submittal sequence:

During construction of the project and on the job site, the contractor shall maintain a completed record of all changes and corrections from the layout shown on the construction drawings, if applicable (this record is known as the ‘red line” set). The Contractor shall enter such changes and corrections onto the electronic

Contract or Record drawings. Within 60 days of Project construction completion, the Contractor shall create record drawings, and submit the drawings in the form of one full size set of paper prints. Upon approval by USAG-RIA DPW of the record drawing prints, the contractor shall submit one full size set of mylar (record) drawings, one CD-ROM (containing the Microstation electronic record drawing CADD files), and the “red line” drawing prints to the Contracting Officer’s Representative (DPW). The electronic copy of the drawings shall be in the current version of Microstation being used by DPW. The record drawings shall indicate all changes, corrections and the actual locations of all sub-surface utility lines. In order for the location of these lines and appurtenances to be determined in the event the surface opening or indicators become covered or obscured, the record drawings shall show, by offset dimensions to two permanently fixed surface feature, the end of the each run including each change in direction. Valves, splice boxes, and similar appurtenances shall be located by dimensioning along the utility run from a reference point. The average depth below the surface of each run shall also be recorded. The Government does not guarantee the accuracy of existing record drawings; it is the contractor’s responsibility to verify all As-Built conditions prior to Project construction.

END OF SECTION 18000