HRA Gray & Pape, LLC, specialists conducted underwater archaeological surveys for the proposed Millennium Pipeline Project’s Lake Erie Crossing (located within the State of New York, the Commonwealth of Pennsylvania, and the Province of Ontario). The primary objective of the geophysical surveys was to map the lake bottom to select a route for the submerged pipeline. The surveys involved the collection of high-resolution, side-scan sonar; high-frequency; sub-bottom profiling; bathymetry. and marine magnetometer data. Navigation and positioning was done with differential GPS systems.
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