Phase 2 of a remedial investigation (RI) has been conducted at the U.S. Army Materials Technology Laboratory (MTL) in Watertown, Massachusetts. The U.S. Army Environmental Center, New England Division, contracted with Roy F. Weston, Inc. (WESTON) under the Base Closure Program Contract Number DAA15-9O-D-0009, Task Order 1, to complete, among other tasks, the Phase 2 RI at MTL. After the Phase 1 RI was initiated, MTL was recommended for closure by the Defense Secretary's Commission on Base Realignment and Closures. The original objectives of the Phase 1 RI did not include assessing concerns associated with future unlimited use of the site by the public after the closure of MTL. To do so, sampling in buildings, as well as more extensive environmental sampling and risk assessment, was required. This additional information was collected during the Phase 2 RI to properly evaluate potential remedial measures that would allow subsequent land use consistent with assigned reuse.