Environmental Restoration

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Tetra Tech, a principal partner in the joint venture Tech2 Solutions (T2S), provided environmental remediation services to the U.S. Army Corps of Engineers New England District (USACE) under a $250M Total Environmental Restoration Contract (TERC). Scope under this TERC included project management, engineering, construction, procurement, program support, and administration on four subprojects within three eastern U.S. states. We managed an integrated program with multiple individual area soil and groundwater investigations, groundwater modeling, geophysical investigations, removal of unexploded ordinance (UXO), and remediation of soil and groundwater.

This project highlights our experience and past performance in addressing RDX groundwater and soil contamination. Under this project, we successfully completed remedial investigations, including groundwater well installation and sampling, contaminant plume modeling, and remedial system design for a 2 mi2 RDX groundwater plume at the Joint Base Cape Cod (JBCC).

JBCC, located on Cape Cod Massachusetts is a 22,000-acre military base supporting several branches of the armed services. The base has been actively used since 1935. The northern 15,000 acres, known as Camp Edwards, has been used for military training purposes, with the heaviest activity from the 1940s to the 1980s. Training activities that have impacted the soil and groundwater of this site include small arms ranges; impact areas used for artillery, mortar, and rocket training; and explosives demolition. Contaminants of concern were explosives (including RDX), perchlorate, VOCs and SVOCs, metals, pesticides, herbicides, PCBs, and dioxins/furans.

RDX 3-D Plume Model

We performed groundwater monitoring, modeling to define the extent of contamination and optimize remedial system designs, and completed the remedial system design. In addition, we have worked on seven other RDX groundwater plumes and soil contamination sites at JBCC, evaluating, designing treatment, installing  monitoring and extraction wells, constructing a GAC treatment plant, and evaluating monitored natural attenuation results.