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2/7/85 AC 150/5100-14A Appendix 1 APPENDIX 1. CURVES FOR ESTIMATING ENGINEERING SERVICES 1. Over the years, engineering experience has established some approximate correlations between engineering costs and construction costs for certain types of engineering design where design procedures and materials of construction are more or less standardized. These correlations have resulted in the development of the curves presented in,figunes:1 and 2 and represent median. compensation computed as a percentage of construction costs and developed from responses.tb "questionnaires sent out by the American Society of Civil Engineers. The original data was developed in 1963; the curves presented here were revised in 1974 and published in 1975. Obviously, the appropriate compensation for a given assignment may vary well above or below these curves, depending on a multitude of varying factors. The curves are a valuable tool for comparison with cost plus a fixed fee and lump -sum charges for basic service, but should not be rigidly adhered to. At best, they provide a rough approximation of engineering costs only for the basic services outlined in chapter 1, paragraph 3. For example, the design cost for a pavement overlay is usually minimal compared to the construction cost. In contrast, the design cost for a project involving soils investigation, grading, drainage, paving, and turfing would be more costly and have a ratio of design cost versus construction cost very different from that for the job limited to pavement overlay. 2. If basic services include preparation of the preapplication for Federal assistance, preparation of the property map, updating of the airport layout plan, preparation of "as -built" drawings, and/or preparation of forms and applications, the percentage of the total construction cost will be higher than the percentage for basic services for the same project which does not include these items. 3. The special services beyond those normally considered basic services contribute substantially to the local engineering cost of the project. These special services are furnished directly either by the sponsor, by the primary engineering firm, or by a firm specializing in such work. 4. Curve A in figure 1 is intended to apply to assignments of which the following are typical examples: a. Airports with extensive terminal facilities. b. Water, sewer, and industrial waste treatment plants. c. Bridges which are asymmetric or are otherwise complicated. d. Access roads. e. Highway and railway tunnels. f. Pumping stations. g. Large intercepting and relief sewers. h. Sanitary sewer lines under 24 inches (60 centimeters) in diameter. 1