The facilities are located at the project location noted and will include the three (3) infiltration lagoons and two (2) infiltration basins at the plant. All survey services performed shall be completed by the standards as set forth by the Rules of Standard Practice as outlined by the North Carolina Board of Engineers and Land Surveyors and North Carolina General Statutes, to include GS 47-30 and North Carolina Administrative Code - 21 NCAC 56.1606. The survey shall be horizontally tied to the North Carolina State Plane Coordinate System under the North American Datum of 1983 (NAD83). Vertically, the project shall be tied to the North American Vertical Datum of 1988 (NAVD88). The project’s units shall be the U.S. Survey Foot. Survey and quality control methods used shall be practical and generally follow accepted methods of practice as found in the USACE Hydrographic Surveying Manual. Control Survey • Surveyor shall establish temporary site control (rebar or nail) using GPS RTK methods. Additional control points may be set for tasks outlined below. Ground coordinates shall be provided on the survey map delivered to the Owner. Bathymetric Survey • Surveyor shall locate the water bottom, where attainable, using GPS positioning and underwater echo sounding methods. An RTK-GPS setup will collect horizontal and vertical surface locations in combination with a HydroLite Echosounder, attached to a crewed boat. Horizontal and vertical locations of the lake bottom shall be derived from this combined data. The owner anticipates the use of an electric motor for navigation purposes on the water. Additional boat resources shall include a remote-controlled boat with a single-beam echosounder in the hull. This boat shall be operated from land and from within the crewed boat. • Data shall be collected in a linear cross-sectional format throughout the project area. The distance between points shall be relative to the underwater features that are collected. Areas with more relief shall have points that are closer together. Additionally, data shall be collected in a pattern perpendicular to the cross sections to validate the cross-section data. Manual water depth checks shall be collected using a depth gauge, fiberglass tape.
