National Oil and Hazardous Substance Pollution Contingency Plan; National Priorities List

The Environmental Protection Agency (EPA) Region I announces the partial deletion of the Materials Technology Laboratory--Watertown Arsenal Development Corporation Parcel and Commander's Quarters parcel (jointly known as Zones 1-4) from the National Priorities List (NPL). Zones 1 through 4 of MTL include a portion of Operable Unit (OU) No. 1 and OU No. 3. The NPL constitutes appendix B of 40 CFR part 300, which is the National Oil and Hazardous Substance Pollution Contingency Plan (NCP), which EPA promulgated pursuant to section 105 of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), as amended by the Superfund Amendments and Reauthorization Act. After consultation with the Commonwealth of Massachusetts, EPA has determined that all appropriate actions under CERCLA have been implemented. Moreover, EPA and the Commonwealth have determined that remedial activities conducted to date at OU No. 1 (Zones 1 through 4) and OU No. 3 have been protective of human health, welfare and the environment. Institutional controls, which have been established as part of the remedy, will ensure continued protectiveness in the future. Institutional controls are provided for in a Grant of Environmental Restriction and Easement. The Charles River Park parcel and the Charles River Operable Unit, are still undergoing investigation/remedial actions and are not to be removed from the NPL at this time.