GdB delivers quality, timely, actionable geospatial data to the infrastructure, property, and energy markets of the Northeast.
GdB was hired as a subconsultant to provide a variety of Land Surveying services for this large scale effort by Nassau County DPW to divert dry weather effluent from the Bay Park STP to be discharged via the ocean outfall at the Cedar Creek WPCP. This required construction of a new dedicated pump station at Bay Park, a new force main between the two facilities and all related control systems and appurtenances required.
GdB was hired by Burns & McDonnell as a WBE Certified Subconsultant to provide various Land Surveying services on a proposed route for a new 138KV Underground Transmission cable to be used by PSEG to deliver reliable service and grid resiliency to Southwest Nassau County after the failure of two existing 50+ year old cables.
GdB field crews performed detailed topographic and utility surveys for each site, approximately 1.5 to 2 acres in size. All existing structures, pavement edges, sidewalks, curbing, ADA improvements, fences, gates, retaining walls, signage, lighting and visable surface hardware for utilities, and any other planimetric features were located.
GdB completed a survey of approximately 3,000 linear feet of roadway along the Trans-Manhattan Expressway Overpass. The topographic and utility survey of the local roads was performed using a combination of stationary LiDAR (High Density Laser Scanning) and traditional robotic total station survey methods. The stationary LiDAR allowed GdB to capture enough detail needed to create surface mapping contours at 0.2 foot intervals. Total Station surveying was used to complete the utility survey as well.
This was GdB’s largest ground control effort for Aerial Imagery to date. Field Crews set aerial targets at specified distances and provided survey accurate coordinates for photogrammetrists to perform their work to accuracy standards. GdB prepared and provided a complete survey file in AutoCAD Civil 3D utilizing pipe networks and progress was constantly tracked in GIS. This huge survey and mapping effort was expedited and completed within only six months, on time and within budget.
For the site, GdB conducted due dilligence boundary research, obtaining records from publicly available municipal agencies and Amtrak. GdB field crews completed a Quality Level “C” utility survey, compiling record plan data with located surface hardware. This mapping was included in the basemapping deliverables to the client.