PM08 Sediment Quality Assessment
Exhibit Hall
8:00 AM - Monday

(PM105) Use of Spatial Modeling in Planning for Attainment of Remediation Goals.

Swanson, W1, Michael, D1, Hicks, J2, 1 Neptune and Co., Los Alamos, NM, USA2 Battelle, Columbus, OH, USA

ABSTRACT- As a site moves from the investigation phase to a feasibility study, consideration will focus on strategies that compare remedial alternatives and associated costs and impacts against the benefit in overall risk reduction. This analysis includes determining how preliminary remediation goals will be applied to bring the exposure average down to an acceptable level. The result is the identification of the locations and volume of sediment or soil to undergo removal or remediation to achieve the cleanup goals. Spatial modeling of the primary contaminants or risk drivers can be used to guide the selection of remediation areas or volumes and estimate the remaining contaminant levels following remediation. Techniques of local regression or geostatistics produce 2D or 3D spatial models for use in area- or volume-weighted average estimation of post-remediation site concentrations. Remediation alternatives can be compared, including isolation and dredging followed replacement with fill or leaving subsurface sediment or soil in place. Remediation areas can be driven by concentrations identified by the spatial model alone or in combination with engineering ease of access. Application of these techniques to a number of sites illustrates the utility of the approach.

Key words: Contouring, Spatial Models, Feasibility Study, Remediation alternatives

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