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bowmanconsulting.com As a part of the effort to densify Martin County’s NAVD88 vertical control network and help strengthen the county’s FEMA rating our team coordinated with county staff to layout and plan bench runs throughout two large areas of the county. After staff approval a field reconnaissance of each area took place to identify potential structures for placement of new benchmarks and also to locate existing mon- uments suitable for inclusion in the densification effort. Monuments by other agencies such as South Florida Water Management District and Florida Department of Transportation were located and incorporated where deemed sufficient by the client. Our team then set additional monuments per the county developed program standards and additionally poured concrete collars for added stability on benchmarks in the more rural areas where hard surfaces were not readily available. All level runs began and ended on existing NGS published monuments and included other published monuments as intermediate checks. Level runs were performed using necessary procedures to meet or exceed the Florida “Standards of Practice” for vertical control surveys as well as the program require- ments. Field crews utilized digital levels and achieved second order, or higher, accuracy standards. There were 77 miles of digital level runs which were post-processed and adjusted using Trimble Business Center software. Horizontal coordinates were established on all benchmarks utilized for the project. This involved multiple occupations of each point during different sessions on the Trimble VRS Now network. These sessions were all processed and reviewed in the office using the Trim- ble Business Center software. Where the variance was found to be out of tolerance the sessions were calibrated and the checks were per- formed again to reevaluate the precisions achieved. If still found to be out of tolerance, additional sessions were performed to eliminate the poor precision data and ensure the final deliverable had quality data. In total, 141 benchmarks were certified by our team and delivered in a compatible format to be published into the County’s in-house GIS. The deliverables received minimal comments from the county’s review process thanks to our internal QA/QC program which involved mapping/parsing the data in multiple software platforms as well as an internal peer review by professionals who hadn’t participated in the project. The QA/QC program is designed to maintain the highest of professional standards and at the same time save clients’ time and money on their projects. Vertical Control Densification Projects Martin County, Florida Client Martin County 2401 Southeast Monterey Road Stuart, Florida 34996 Michael O’Brien, PSM, CFM p: (772) 288-5472 e: michaelo@martin.fl.us Contract Dates 3/2015 – 4/2015 Fee $25,700 Tab 1 Minimum Requirements Page 17