Infrasense was tasked with carrying out a subsurface utility engineering (SUE) survey within the vicinity of three culvert alignments located in the mountains of New Hampshire. This survey involved completion of both electromagnetic induction (EMI) and 3D ground penetrating radar (3DGPR) data collection. Results of the geophysical data collection were analyzed to interpret and create maps identifying locations and conditions of individual utilities, as well as any subsurface obstructions within the survey area.
COOS COUNTY, N.H., Feb. 26, 2025 -- A subsurface utility engineering (SUE) survey was recently completed by Infrasense engineers along ski slopes in the mountains of New Hampshire. A combination of electromagnetic induction (EMI) and ground penetrating radar (GPR) methods were utilized during this survey to designate the locations, depths, and service type of utilities. Various utility surface features were also located in the field including transformers, utility poles, and catch basins. Both the EMI and GPR surveys were completed in one day, using a side-by-side setup of vehicle-facilitated GPR data collection. The survey area included a diverse makeup of terrain, including gravel road, landscaped, grassy, and open areas. Each utility identified during the collection was recorded using RTK GPS and field notation and identified on the ground surface with marking paint, and the various site conditions allowed for depth penetration across the site to approximately 12 feet.
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