Specialty Devices, Inc. (SDI) was contracted by ENVIROdredge to perform a pre-dredge bathymetric and sub-bottom survey of one of the flood control ponds located in Burning Tree Country Club, Greenwich, Connecticut. The survey objective was to map the existing water bottom and sediment bottom by combining an acoustic bathymetric survey and vibracore sampling.
The surveyed pond serves as a flood control pond in Burning Tree Country Club, Greenwich, Connecticut. SDI provided equipment and personnel to perform this survey. The survey equipment was selected to accommodate the limited access and shallow water present at the survey site. The acoustic bathymetric survey was performed using an SDI manufactured SC-200 Bathymetric Survey System. The SC-200 system is equipped with a survey depth sounder for bathymetric data and a DGPS navigation system to provide the geographic information. Due to the shallow water present at the site, the acoustic survey was limited in the northeast portion of the surveyed pond. sediment push data and vibracore data was used to provide both bathymetric and sub-bottom information. Four core samples were taken at four different locations by using SDI VibeCore Mini-H for a core sample visual analysis.
A total of 10882 acoustic data points were collected to create a bathymetric contour map and sediment isopach contour map for the surveyed pond. Four vibracoring sample and thirty-six push probes ware sampled throughout the pond to provide supplemental bathymetric information and sub-bottom information.