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Representative Risk Assessment Projects


OTO has extensive experience conducting risk assessments in accordance with the Massachusetts Contingency Plan (MCP) and CERCLA (Superfund). We have three senior staff members who specialize in risk characterization. Additional staff specializing in hydrogeology, environmental engineering, remediation and air dispersion assist in risk characterization as needed. OTO strives to provide timely delivery of clear and accurate reports that meet or exceed our clients’ expectations by integrating quality technical analysis with sound and pragmatic project management.

Housatonic River

OTO has prepared hundreds of risk characterizations for projects conducted under the MCP, and other regulatory programs, including RCRA, TSCA and CERDA.

OTO has prepared hundreds of risk characterizations for projects conducted under the MCP. The complexity of these  characterizations has ranged from simple Method 1 assessments covering residential fuel oil releases to complex Method 3 assessments for large chemical manufacturing plants and ecological risk assessments for water bodies with impacted sediments. OTO risk assessment staff regularly attends technical meetings and training sessions sponsored by the Massachusetts Department of Environmental Protection and the Licensed Site Professional Association to remain current with MCP regulations and guidance regarding risk assessment. OTO offers risk-based options to clients, while working within the confines of the applicable MCP regulations and guidance.

Our staff have worked on numerous federal Superfund sites. We are o knowledgeable about current risk assessment procedures used by U.S. EPA, including RAGS Part D Standard Tables. Our firm currently assists various municipalities and town committees in overseeing Superfund sites. For the town of Acton, Massachusetts, we are consulting on the remediation of two Superfund Sites. For a Watertown, Massachusetts, citizens group, we previously consulted on the Watertown Arsenal Superfund Site through an EPA-administered Technical Assistance Grant.