Massachusetts Agreement Under Section 37 or 37A is an agreement between the Massachusetts Department of Environmental Protection (DEP) and a responsible party to address the release of hazardous materials into the environment. The agreement is part of the Massachusetts Contingency Plan and requires the responsible party to clean up the contamination, pay for the costs of the cleanup, and provide assurances that the contamination will not spread further. The two types of Massachusetts Agreement Under Section 37 or 37A are: -Remedial Action Agreement — This agreement establishes the cleanup action and cost-share arrangements necessary to address the release of hazardous materials. —DemanAgreementen— - This agreement requires the responsible party to reimburse the DEP for the costs of cleanup, monitoring, and enforcement of the agreement.