US Army Corps of Engineers
Baltimore District

Groundwater

The U.S. Army Corps of Engineers, Baltimore District has finalized the Final Groundwater Remedial Investigation report for the Spring Valley Formerly Used Defense Site (FUDS). The Remedial Investigation report details the groundwater investigation findings to include a review of all the data collected to determine the nature and extent of groundwater contamination in Spring Valley from past Army activities. The Groundwater RI also includes a Human Health Risk Assessment, which evaluates risk to human health using different potential exposure scenarios for groundwater, including the potential future use of groundwater as a drinking water source.  As a reminder, Spring Valley groundwater is not currently used as a drinking water source.  

Click here to download the main report without appendices.

Click here to access the report's large appendices (the Spring Valley Extranet Site).

The full report, including the appendices, is also located in the Information Repository at the Tenley-Friendship Branch Library, located at 4450 Wisconsin Ave. N.W., Washington, D.C.

The Groundwater RI concluded that there is no unacceptable risk posed by groundwater under the current land use (as it is not used for drinking water). Perchlorate and arsenic in groundwater were detected at levels that would pose a risk if groundwater was used as a drinking water source in the future in the area near Kreeger Hall on American University and near the Glenbrook Road disposal areas. The study refers to the area where these detections were as Exposure Unit 2, and a map showing the concentrations of arsenic and perchlorate detected over the course of monitoring at these wells is available by clicking here. A Feasibility Study evaluated a range of alternatives that would address the risk posed by the potential future use of groundwater as a drinking water source. Based on the Feasibility Study, the Army Corps selected Land Use Controls (LUC) and Long Term Monitoring (LTM) as the preferred remedy.

The U.S. Army Corps of Engineers is drafting a Proposed Plan outlining a recommended path forward regarding groundwater contamination and working with regulatory partners in the EPA and the D.C. Department of Energy and Environment to achieve concurrence with the draft Proposed Plan. Since DOEE did not agree with the Army’s preferred remedy identified in the PP, they requested initiation of a formal dispute resolution, which will involve meetings between DOEE and the Army to resolve the disagreement in an attempt to gain full support of the PP from all parties. 

An overview of groundwater efforts, the Feasibility Study and an overview of that dispute resolution process are all included in the November 2018 Restoration Advisory Board presentation available by clicking here.