In addition, Integral oversaw a geophysical resistivity survey for the project site in 2021. Integral also created a 3-dimensional geologic model in Leapfrog from lithology observations made in 20. Integral interpolated chemical concentrations in three dimensions using a radial basis function algorithm in Seequent’s Leapfrog Works software (Leapfrog). Sediment cores collected through 2022 provide information on lithology and chemical concentrations. Each set of sounding records was converted to an approximate historical bathymetric surface using kriging interpolation in ArcGIS. Nautical charts provided historical, discrete-point soundings recorded in 1959, 1967, 1968, and 1969 within and around the approximate dredge footprint. Integral generated a 3-dimensional model using multiple lines of evidence including historical soundings, recent bathymetric surveys, subsurface sediment chemistry, lithology, and sediment resistivity. (Integral) created a 3-dimensional model of the river and nearshore area of the project site to estimate the historically dredged footprint and refine the project conceptual model. Given the suspected location of the 1967 dredge event in relation to the project site, Integral Consulting Inc. The lateral and vertical extent of this dredging event is uncertain as no as-built documentation is available. At a project site in the Pacific Northwest, a proposal for a large fluvial dredging event was approved in 1967 by the U.S.
The lack of historical knowledge leaves project teams in need of employing creative solutions to recreate past events. Site-specific historical documentation is not always available to inform conceptual site models. Poster presented at Battelle Sediments Conference, Jan 9-12, 2023, Austin, Texas Additional contribution by Debbie Deetz Silva (EVRAZ Inc.
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