| When Moffat & Nichol Engineers were tasked with designing repairs and upgrades of the breakwater for the I & J waterway at the Bellingham Marina for the Marina and Coast Guard they knew they needed a survey/mapping firm that could be counted on to supply complete and accurate data. The budget was limited and the project was on a fast track timetable so they called PGS, Inc. with whom they had previous successful projects with, to perform the necessary mapping requirements Upland Mapping PGS, Inc. was tasked with mapping of the upland portion of breakwater locating anomalies and failures along with improved features and utilities. The mapping was to be of sufficient accuracy and density to provide contours at an interval of one foot. The mapping was to extend from approximately twenty feet beyond the top of breakwater and include the top and slope down to the edge of water. The lower limit of the mapping was performed at a low tide condition in order to create an overlapping check with the bathymetric mapping. Bathymetry PGS, Inc was to perform a bathymetric survey of the underwater portion of the breakwater extending from the shallow limits of the survey vessel to approximately ten feet beyond the toe of the breakwater. The bathymetry was performed by running four lines parallel to the shoreline at approximate even spacings. Additionally, transect lines were run at approximate one hundred foot intervals for the lineal limits of breakwater mapping. The near shore bathymetry was performed at high tide conditions in order to create overlapping check with the upland mapping. Datum The survey data was referenced to NAD83, SPC WA North (US Survey Feet) and MLLW, Epoch 1983-2001 (US Survey Feet) |
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