(A) Subdivisions within the jurisdictional limits of the city shall be tied to a minimum of two survey control points established by traverse to the city’s Monument Densification Project on file with the City of Waterloo. Re-subdivisions that have previously been tied to two survey control points need only show on the Final Plat the previously plotted bearing(s) and dimension(s) by the original subdivision plat.
(B) Subdivision boundary descriptions shall be based on an accurate traverse and referenced in accordance with the Illinois Coordinate System Act, ILCS Ch. 765, Act 225, § 1 et seq., and the Federal Geodetic Control Committee. The allowable error of closure and positional accuracy of the boundary traverse, or any portion of the Final Plat, shall be one tenth of a foot (0.10) or 1:20,000 for distances greater than 2,000 feet for urban property (Second Order, Class 1) and one tenth of a foot or 1:10,000 for distances greater than 1,000 feet for suburban property (Second Order, Class 2).
(C) The subdivider shall provide a minimum of one permanent monument/benchmark in each subdivision within dedicated right-of-way with adequate access from the street. Additional phases of a subdivision will not be required to provide the permanent monument/benchmark if the boundary of the phase being developed is less than 1,000 feet from a permanent monument/benchmark placed in a previous phase of that same subdivision. Variances may be granted, by the City Council, for subdivisions if the boundary of the proposed subdivision is less than 1,000 feet from one or more previously placed permanent monuments/benchmarks. If a variance is granted, the city shall determine which permanent monument(s)/benchmark(s) will be used.
(D) The permanent monument(s)/benchmark(s) shall be marked as horizontal control and vertical control. When elevations are established by spirit leveling, loop closure to existing control shall not exceed 0.035 feet M, where M represents the length of level circuit in miles. Second Order, Class 2 control shall be required for all permanent monument(s)/benchmark(s). All permanent monument(s)/benchmark(s) shall be Type II marker with bronze tablet as described on the City of Waterloo’s Typical Plat Control Details as shown in the City of Waterloo Construction Details, and by this reference made a part hereof. The permanent monument(s)/benchmark(s) shall be set level with the finished grade. The proposed benchmark shall be in the City of Waterloo datum, North American Vertical Datum, ‘88 (NAVD88). The datum elevation and monument coordinates shall be checked against at least two approved reference marks on file with the City of Waterloo. The result of the closure survey shall be reported in writing on the City of Waterloo Typical Plat Control Details Monument and Benchmark Record as shown in the City of Waterloo Construction Details, and by this reference made a part hereof, and provided to the City of Waterloo Zoning Office. An Illinois Professional Land Surveyor shall sign and seal said form. Upon receipt of this information, the city shall review said information. The city reserves the right to request additional checks of submitted information on the part of the Surveyor working for the developer, with any and all additional costs to be borne by the subdivider and his Surveyor. Upon approval, the city shall provide the subdivider with a bronze tablet and a benchmark number. The subdivider shall stamp the bronze tablet with the elevation and benchmark number. The city shall inspect the installation of the disc. The Final Plat will not be signed and recorded until the permanent monument(s)/benchmark(s) is/are installed and inspected.
(Ord. 1278, passed 3-15-2004; Am. Ord. 1696, passed 3-21-2016)