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SSeeaa DDiivveerrssiiffiieedd,, IInncc.. 2211 NNWW 22nndd SSttrreeeett DDeellrraayy BBeeaacchh,, FFlloorriiddaa 3333444444 556611..224433..44992200 ((PPhhoonnee)) –– 556611..224433..44995577 ((FFaaccssiimmiillee)) wwwwww..sseeaaddiivveerrssiiffiieedd..ccoomm AApppprrooaacchh//MMeetthhooddoollooggyy City of Sunny Isles Beach Shoreline Surveying and Mapping Consulting Services RFQ No. 16-06-01 Magnetometry Should there be the potential for submerged and buried obstructions or perhaps items of cultural significance within a canal, lake or other waterbody, SDI will typically use a magnetometer. Magnetometer data can be used to identify and map features of ferrous composition that are either buried or projecting above the seafloor such as manmade debris, cables and pipelines and /or other submerged items that may be impede navigation or impact dredging operations. The survey is conducted using a cesium magnetometer with positioning and heading provided via integrated dual-antenna DGPS with heading accuracy of 0.5 degrees. Cultural resource investigations encompassing magnetometer surveys can be assigned to SDI with the assurance of years of experience that few firms in the United States can match. Florida’s coast is rich in cultural resources as a result of our maritime history, and it is often necessary to provide investigations of these areas to delineate potential historic sites. Sub-Bottom Profiling Geotechnical studies and pre-dredge planning and design projects often require the support of a sub-bottom profiling survey. Sub-bottom profile data is collected using an Edgetech Sub-Bottom Profile system operating at low frequency range (2-16 kHz) to maximize penetration into the surface sediments. The sub-bottom profile system will be a portable system that uses a full spectrum CHIRP technology that minimizes multipath and noise effects while achieving high definition image slices of the sub-bottom material characteristics. Depending on sediment characteristics, several meters of penetration should be achieved using this system As requested, SDI can deploy divers to physically expose, identify and investigate canal banks, seawalls, structures, and/or utilities for any scouring/undercut areas, utility locations or seawall damage in proximity to the bridges. Divers can utilize either water jetting equipment or air sand lifts as required for classification and location, and/or groundtruthing of submerged utilities and structures. SDI survey crews can be onsite during the dive operations to locate the areas both horizontally and vertically using conventional survey and / or RTK GPS methodologies. Current (Acoustic Doppler Current Profiling), Wave, and Tide Studies SDI has conducted numerous current studies using Acoustic Doppler Current Profilers (ADCP) relating to the design of offshore breakwaters and groins, bridge scour investigations and hydraulic / flushing studies. Both static mount and dynamic gauges have been used depending on the requirements of the design professional. Typically SDI utilizes Nortek 2 MHz Aquadopp Profilers. Sediment Testing and Vibra-Cores SDI has the capacity to perform sediment testing, sediment probes and sediment core sampling. Sediment samples can be extracted using divers equipped with hand coring devices or from the survey launch using ponar grab samplers. Sediment probes are conducted using steel rods or h ydraulic jet pump equipment depending on the required depth of penetration. SDI also has a barge equipped with A-frame and vibra-core for shallow water sediment cores. These services may be of value for evaluating sediment characteristics pertaining to dredge projects and for search of sand sources relating to shore protection projects.