2018-063B - Laserfiche WebLink

Home Browse Search

,oAPTIM Task 8: Multibeam Bathymetric Survey of South Borrow Area Task 8: Scope of Work March 14, 2018 Page 9 of 10 A multibeam bathymetry survey will be collected for Indian River County's South Borrow Area —Sub Area 1, 2, and 3. Approximately 35 linear miles of data will be collected to achieve a detailed bathymetric surface to assist with volumetric calculations to determine the amount for resources remaining within the borrow area. Additional data will be collected to account for holidays within shallower portions of the Borrow Area. All work will be conducted under the direct supervision of a Florida registered Professional Surveyor and Mapper as well as a Certified Hydrographer. The survey and all deliverables will adhere to Chapter 472 of the Florida Statutes (FS) as well as the Standards of Practice set forth in 5J-17 of the Florida Administrative Code (FAC) Prior to the start of the survey, reconnaissance of published National Geodetic Survey (NGS) monuments will be conducted to confirm that the survey control is accurate and undisturbed. The survey will be controlled using 2nd order monuments or greater in order to achieve required accuracy. Horizontal and vertical positioning checks will be conducted at the beginning and end of each hydrographic survey day using 2nd order monuments located in the project area. All data will be collected in feet relative to the North American Datum of 1983(2011) and the North American Vertical Datum of 1988 (Geoidl2a) The survey will be collected onboard APTIM's 24' survey vessel using a Teledyne Reson 7125 SV2 Multibeam Echosounder. Vessel navigation, horizontal positioning, and water level corrections will be provided by RTK GNSS relative to NGS published monuments located during the reconnaissance survey. An Applanix POS MV WaveMaster will be used to correct for vessel attitude (heave, pitch, and roll) and heading. The Applanix POS MV works by combining GNSS angular rate and acceleration data from an inertial measurement unit (IMU) and heading from GNSS Azimuth Measurement System (GAMS) to produce a precise inertial position solution. All altitude and position data will be logged for post processing using Applanix POSpac Mobile Mapping Suite (if necessary). GAMS calibration and a multibeam patch test must be performed prior to the start of multibeam data collection to account for system misalignments relative to the vessel's reference frame. Sounding data will be acquired using Hypack 2017a Hysweep software and processed with Hypack's MBMAX64 utility. Task 8: Deliverable A certified hydrographic survey map, signed and sealed by a Florida Registered Professional Surveyor and Mapper, will be provided. Survey maps will include a full color digital elevation model (DEM) created from reduced soundings at lm resolution or greater. Full resolution ASCII XYZ files of all soundings collected will be provided as well as gridded (reduced) soundings used to create the DEM. Task 8: Schedule Field work is anticipated to take up to 7 days with deliverables provided within 30 days of completion of field work. Task 8: Cost The lump sum cost for this task is $39,390.00. Sector 3 — 2018006 — W0#2: Design and Permitting Proj. #631235714