Washington State Department of Ecology, 108 pp, 2017

This Work Plan describes the pilot study activities proposed to evaluate engineered in situ pH neutralization to treat dissolved plating metals (Ni, Cd, Cu, and Zn) present in Site Unit 1 source area groundwater. Pilot testing will assess the effectiveness and cost of using pH neutralization to immobilize plating metals in groundwater, with a specific focus on Ni in water table interval groundwater. Pilot results will be used to refine the description and evaluation of remedial alternatives presented in the SU1 feasibility study and to select the preferred remedy. Model simulations predict that under the influence of three processes—metal oxide/hydroxide precipitation, metal sulfide precipitation, and net neutralization potential—elevated Ni concentrations will not be transported downgradient and the plume will shrink over time. https://fortress.wa.gov/ecy/gsp/DocViewer.ashx?did=70062 This work is a small part of the ongoing cleanup of the Burlington Environmental LLC Georgetown site in Washington State. See additional project reports at https://fortress.wa.gov/ecy/gsp/CleanupSiteDocuments.aspx?csid=2622.