Reso 2016-2575 - Laserfiche WebLink

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!^ Draft Scope of Services Citywide Coastal Monitoring Program A( SEA City of Sunny Isles, Miami-Dade County,Florida September 29,2016 SDI P.N. 16-2422 DIVERS/Ill:!) Page 2 of 4 survey event. Beach profiles will be conducted at historic azimuths/headings as published by FDEP BBCS. Profile data collection at R-monuments will extend 3000 feet from the shoreline or to—30 feet (NAVD), whichever point is reached first. The eight (8) intermediate profiles will extend 1,000 feet seaward of the approximate shoreline. In addition to the annual, late summer survey events, it is proposed, as an option for the City, to conduct periodic winter survey events to monitor the condition of the beach during this time of year. Winter survey events will be scheduled for January to February timeframe. Profile data collection for the winter survey events will be conducted at the same R-monuments and intermediate points of the summer survey events, however data collection will extend only to wading depth with the objective of monitor shoreline changes between summer and winter months. Task Two: Field Data Collection,Data Processing and Final Deliverables Proiect Horizontal and Vertical Control Verification Horizontal data shall be collected based on the Florida State Plane Coordinate System, East Zone, North American Datum of 1983, (NAD83). Vertical data shall be collected based on North American Vertical Datum of 1988 (NAVD 88). In accordance with the Specifications, SDI will verify the horizontal and vertical position of all found and monuments to be used for the survey. Horizontal and vertical positions will be verified via Real- Time Kinematic GPS procedures. In the event vertical obstructions prohibit the use of GPS, conventional methodologies will be employed. BBCS will provide SDI with a current data file (ASCII format) describing the horizontal and vertical location of all reference monuments for the survey. Temporary control points (TBM's) will be set in the event a monument cannot be readily found. As practical, the TBM will be set at the reference monument location. If the specified location is not practical, the TBM will be set at a more suitable location either landward or seaward along the specified profile azimuth. TBM's will be established in accordance with the Specifications. The BBCS shall be notified of any missing monuments and shall be provided with the horizontal and vertical position of all TBM's. Onshore Profile Data Collection -Topographic Onshore profile data shall be collected at FDEP range monuments R-6 through R-19, including intermediate profile control points, as applicable. Data collection shall extend seaward to approximate wading depth or as required to overlap the offshore profile data a minimum distance of fifty (50) feet. Data collection at R-monuments shall extend upland to the profile monument or approximately 150 feet landward of the vegetation line, whichever is most landward. Data collection at intermediate profiles will extend to the landward side of the dune or vegetation line. In the event there is a physical barrier on line between the beach and the monument, every reasonable attempt shall be made to extend the survey beyond the barrier to the reference monument position. It is understood that certain physical barriers may be considered impassible such as large buildings, private residences with difficult access, waterbodies, mangroves or other heavy vegetation requiring line clearing.. At the discretion of the surveyor, data collection will be terminated at the first physical barrier if deemed impassible using practical means of extending the survey landward. Profiles terminated due to impassible barriers will be noted in the field books. Profile data will be collected using either conventional differential leveling or Real-time Kinematic Differential Global Positioning techniques. Accuracy levels shall be in accordance with the Specifications. Data points will be collected at a maximum interval of twenty-five (25) feet and at all grade breaks (exceeding six inches) and material changes along the profile. In the event the FDEP Surveying • Engineering • Applications .; 7