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Division 2 -Technical Provisions, IRC -1707 <br />(u) Map Accuracy. <br />(1) Vertical Feature Accuracy: <br />© (a) Vertical Control: Field -measured control for elevation information shown upon survey <br />maps or reports shall be based on a level loop or closure to a second benchmark. <br />® (b) Closure in feet must be accurate to a standard of plus or minus .05 ft. times the square <br />root of the distance in miles. <br />(c) All surveys and maps or reports with elevation data shall indicate the datum and a <br />description of the benchmark(s) upon which the survey is based. <br />© (d) Minor elevation data may be obtained on an assumed datum provided the base <br />elevation of the datum is obviously different than the established datum. <br />(2) Horizontal Feature Accuracy: <br />® (a) Horizontal Control: All surveys and maps or reports expressing or displaying features in <br />a publicly published coordinate system shall indicate the coordinate datum and a <br />description of the control points upon which the survey is based. <br />© (b) Minor coordinate data may be obtained and used on an assumed datum provided the <br />numerical basis of the datum is obviously different than a publicly published datum. <br />IN (c) The accuracy of control survey data shall be verified by redundant measurements or <br />traverse closures. All control measurements shall achieve the following closures: <br />Commercial/High Risk Linear: 1 foot in 10,000 feet; <br />Suburban: Linear: 1 foot in 7,500 feet; <br />Rural: Linear: 1 foot in 5,000 feet; <br />® (d) When statistical procedures are used to calculate survey accuracies, the maximum <br />acceptable positional tolerance, based on the 95% confidence level, should meet the same <br />equivalent relative distance standards as set forth in 61G17- 6.003(3)(p)(2.)(c) F.A.C. <br />© (e) Intended Display Scale: All maps or reports of surveys produced and delivered with <br />digital coordinate files must contain a statement to the effect of: "This map is intended to <br />be displayed at a scale of 1/_ or smaller". <br />Division 2 — Technical Provisions - 01025-31 <br />F:\Public Works\ENGINEERING DIVISION PROJECTS\1707 Indian River Blvd Merrill Barber Bridge to 53rd St Resurfacing (SCOP)\1-Admin\Bid Documents\Bid Documents\DIV <br />2 TECHNICAL PROVISIONS - IRC-1707.docx <br />