Locations and concentrations of 30 contaminants of concern – including chrysene, naphthalene, mercury, and arsenic – were identified individually but their cumulative significance was not addressed.

As part of the Act 2 process, a risk assessment can be completed for a Site to develop risk based cleanup standards. The cumulative impacts from detected compounds would be included in the Risk Assessment activities. Evergreen cannot complete a Risk Assessment until the Remedial Investigation Reports are submitted and approved, and the RIR process cannot be completed until the public comment process on the Remedial Investigation Reports is completed.