Reso 2020-3111 - Laserfiche WebLink

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Draft scope of Samces Cltywfdo Coastal Monitoring Nogtam City of Bonny islet, Miami -Dade County, Varfda September 29, 2616 SDI P.N. 16.2422 Page 2 or survey event. Beach profiles will be conducted at historic asimuths/headings as published by FDEP BRCS. 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 proMes will extend 1,000 feet seaward or the eNproximate shoreline, i„ 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 timckame. Froide data collection for the winter survey events cont be conducted at the eame R -monuments and intermediate points of the sutnmer 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 Project Horizontd, and Vertical Control Verification Horizontal data shall be collected based on the Florida State Plane Coordinate System, Fast Zone, North American Datum of 1483, (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 oil found and monuments to be used for the survey. Horizontal and vertical positions will be verified via Real. Time }Gnersatic OPS procedures. In the event vertical obstructions prohthlt the use of OPS,. conventional methodologies will be employed. BRCS will provide SDI with s current data file (ASCII format) describing the horizontal and vertical location or ail reference monuments for the survey. Temporary control points (IBM's) will be set in the event a monument cannot be readily found. As practical, the 78M will be set at the reference monument location. If the specified location is not practical, the TB&l will be set at a more suitable location either landward or seaward along the specified profile azimuth. TBM's will tie established In accordance with the Specifications. The H9CS shall be notified of any missing monuments and shall be provided with the horiiontal and vertical position of all TSM's. Onshore Profile Data Colleedon - Tonomaohic Onshore profile data shall be collected at FDEP range monuments R-6 through R•19. including intermediate profile control pointe, as applicable. Data collection shall extend seaward to approximate wading depth or as required to overlap the offshore profile data a minimum distance of 5fty (501 feel. 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 intenvedlate 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 harrier 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, waterhodies, mangroves or other heavy vegetation requiring line clearing.. At the discretion of the surveyor, data collection will be terminated at the first physical barzfer if deemed impassible using practical means of extending the survey landward. Profiles iodinated due to impassible barriers will be noted In the Geld boons. Profile data will be collected using either conventional dilferentisl 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 or twenty -rive (25) feet and at all grade breaks (exceeding alx inches) and material changes along the profile. in the event the FDEP Surveying • Engineering v Applications J . r