Survey Services in Support of Gas Pipeline Expansion
Maritimes & Northeast Pipeline, a natural gas transportation consortium, comprised of Duke Energy, ExxonMobil, and Emera, initiated operation of a 670-mile pipeline spanning from eastern Nova Scotia to Dracut, Massachusetts.
This expansion considered the construction of approximately 146 miles of new segments of gas transmission pipeline as well as five new compressor stations in Maine and one in Massachusetts. SGC was contracted by Maritimes & Northeast to provide survey services for the initially proposed expansion of the loops and compressor stations. SGC was quickly able to mobilize and equip survey staff for the following tasks:
· GPS Control Surveys– Initial control points were established at approximately three- to five-mile intervals and were set at strategic locations along the proposed route. These points formed a framework from which all subsequent centerline survey efforts were based.
· Resource Area Location– Wetland and other valuable natural resource areas along the proposed pipeline route were delineated by Maritimes & Northeast’s ecological consultant. SGC provided the surveyors equipped with GPS units to rapidly and accurately locate delineation flags.
· Centerline Survey– SGC was able to rapidly mobilize five, three-person survey crews to lay out the location of the proposed loops on the ground and collect pertinent survey data along the routes. The survey crews collected up to 4,000 to 6,000 linear feet of data per day along difficult terrain with limited access options while strictly adhering to rigorous data collection standards and protocols established by the client.
· Data Processing and Management– With five field crews and wetland locations occurring at any given time, a significant amount of high quality data was being produced on a daily basis. All survey data was subjected to a rigorous least-squares analysis to ensure that it was free of blunders or other issues that would impact future design decisions. Data was typically processed and presented to the client for review within 48 hours of receipt.