St. Lucie Inlet Maintenance Dredging Project

GrimDeeper was contracted to perform third-party turbidity monitoring on this inlet maintenance dredging project. USACE is the contracting officer, in partnership with The Martin County Board of County Commissioners, and The Florida Department of Environmental Protection (FDEP). Norfolk Dredging Company is the prime dredging contractor.

The St. Lucie Inlet (SLI) Maintenance Dredging Project involves the mechanical dredging, using the clamshell dredger “Virginian”, of approximately 550,000 cubic yards of material from the SLI, entrance channel and impoundment basin into a scow. The scow is then transported by a towing vessel to the offshore storage placement area, approximately 11-miles South of the SLI. The scow is discharged at the offshore storage placement area for utilization on future storm protection and restoration projects.

Video Links:

Watch dredge “Virginian” working at St. Lucie Inlet (YouTube)
Watch tug vessel “Kendall J. Hebert” tow scow to dump site and open (YouTube)

Click on any picture below to view the larger image:

Scientific Diving

GRIMDEEPER provides Captain/Vessel services to assist with:

  • Submerged aquatic vegetation monitoring and mapping;
  • Hard bottom mapping and monitoring;
  • Coral reef biological surveys;
  • Bathymetric surveys;
  • Dredging projects oversight; and
  • Environmental impact assessments.

A United States Coast Guard Captain is provided to ensure these services are performed in a professional and safe manner.

Click on any picture below to view the larger image:

North Boca Raton Beach Renourishment

GrimDeeper was contracted to perform third-party turbidity monitoring on this beach renourishment and protection project. The City of Boca Raton was the customer, in partnership with The Greater Beach & Park District, Florida Department of Environmental Protection (FDEP), and Palm Beach County. Weeks Marine, Inc. was the prime dredging contractor.

The North Boca Raton Beach Renourishment project initially started in March 2016, but stopped in April 2016 for sea turtle nesting. The project involved the dredging and placement of approximately 104,000 cubic yards of material from various offshore borrow areas to fill approximately 1,100 linear feet of shoreline north of the Boca Inlet, utilizing the Cutter Suction Dredge (CSD) “R.S. WEEKS”. The borrow areas are situated between inner and outer reef complexes, which required particular attention during construction.

Additional monitoring at the reef locations was sometimes required, depending on the proximity of the dredge to the hard bottom resources. Scientific diver surveys were also being performed (by another vendor), and coordination with all equipment was necessary to ensure their safety. Turbidity monitoring included sampling at the borrow areas, hard bottom locations, and beach fill sites, three times daily (12-hour schedule).

The project resumed in February 2017 and completed March 2017. The project involved the dredging and placement of approximately 400,000 cubic yards of material from various offshore borrow areas to fill approximately 4,000 linear feet of shoreline north of the Boca Inlet, utilizing the Cutter Suction Dredge (CSD) “C.R. McCASKILL”. Turbidity monitoring included sampling at the borrow areas, hard bottom locations, and beach fill sites, three times daily (12-hour schedule).

South Boca Raton Beach Renourishment

GrimDeeper was contracted to perform third-party turbidity monitoring on this beach renourishment and protection project. The City of Boca Raton was the customer, in partnership with The Greater Beach & Park District, Florida Department of Environmental Protection (FDEP), and Palm Beach County. Weeks Marine, Inc. was the prime dredging contractor.

The South Boca Raton Beach Renourishment was an add-on project that involved the dredging and placement of approximately 121,000 cubic yards of material to fill approximately 1,200 linear feet of shoreline south of the Boca Inlet, utilizing the Cutter Suction Dredge (CSD) “C.R. McCASKILL”. The material was mined from the ebb shoal of Boca Inlet, which provided some benefits to navigability through the Boca Inlet. Turbidity monitoring included sampling at the dredge (borrow area) and beach fill sites, three times daily (12-hour schedule).

Fort Pierce, Florida Shore Protection Project

GrimDeeper was contracted to perform third-party turbidity monitoring on this beach renourishment and protection project. USACE was the contracting officer. St. Lucie County, in partnership with the State Department of Environmental Protection, were the project sponsors, and Manson Construction was the prime dredging contractor.

The project involved the dredging and placement of approximately 478,000 cubic yards of material from the Capron Shoals Borrow Area (approximately 5 nautical miles offshore) to fill 4,700 linear feet of shoreline immediately south of Fort Pierce inlet, utilizing the Trailing Suction Hopper Dredge (TSHD) “Bayport”. Turbidity monitoring included sampling at the borrow area and beach fill sites, twice daily (12-hour schedule).

Stuart, Florida ICWW Crossroads Maintenance Dredging Project

GrimDeeper was contracted to perform third-party turbidity monitoring on this Intracoastal Waterway (ICWW) maintenance dredging project. Taylor Engineering was the contracting officer. The Florida Inland Navigation District (F.I.N.D.) was the project sponsor, and Southwind Construction was the prime dredging contractor.

The project involved the dredging, utilizing the Cutter-Suction Dredge (CSD) “Wilko”, and placement of approximately 30,000 cubic yards of shoaled material from the ICWW to upland placement into the M-5 disposal area. Turbidity monitoring included sampling at the dredge site, discharge, and seagrass beds on a 24-hour basis in 4-hour intervals (6 times per day).

Jupiter, Florida ICWW Maintenance Dredging Project

GrimDeeper was contracted to perform third-party turbidity monitoring on this Intracoastal Waterway (ICWW) maintenance dredging project. USACE was the contracting officer. Southwind Construction was the prime dredging contractor.

The project involved the dredging, utilizing the Cutter-Suction Dredge (CSD) “Jenny Lea II”, and placement of approximately 44,000 cubic yards of shoaled material from the ICWW to placement onto Jupiter beach. Turbidity monitoring included sampling at the dredge site, discharge, and seagrass beds on a 12-hour basis in 4-hour intervals (3 times per day).

Sebastian, Florida ICWW Maintenance Dredging, 12-Foot Project, Indian River

GrimDeeper was contracted to perform third-party turbidity monitoring on this Intracoastal Waterway (ICWW) maintenance dredging project located in Sebastian, Florida on the Indian River. USACE was the contracting officer. Cavache, Inc was the prime dredging contractor.

The project involved the dredging, utilization of the Cutter-Suction Dredge(s) (CSD) “Michelle” and “Maya Caelyn”, and placement of approximately 300,000 cubic yards of shoaled material from the ICWW (Wabasso bridge to Sebastian Inlet – approximately 5 nautical miles) to the Dredged Material Management Area (DMMA) operated by the Florida Inland Navigation District (F.I.N.D.). Due to the length of pipeline required, four (4) booster pumps were added in-line to successfully pump the material. Turbidity monitoring included sampling at the dredge site, discharge, and seagrass beds on a 12-hour basis twice daily.