Phase I, Phase II Environmental Site Assessment, Remedial Investigation/Feasibility Study
AGI completed a Phase I ESA, Phase II ESA, and a Remedial Investigation/ Feasibility Study (RI/FS) of 55 acres of former farmland (rye grass) which had elevated concentrations of the herbicide dieldrin in the shallow soils.
The hospital's plans involved the construction of a teaching hospital campus on the site including clinics, classrooms and dormitories. AGI performed statistical analysis of the dieldrin concentrations and performed a risk assessment for future occupants of the property.
We worked with the hospital's construction engineers in planning the construction in a way that would minimize exposure of construction workers and future occupants of the property to dieldrin while minimizing construction costs.
The selected remedy included the removal and re-use of contaminated shallow soils as backfill in large utility trenches and beneath elevated landscaping berms around the perimeter of the campus. Other impacted soils were covered with asphalt pavement beneath parking lots and driveways. None of the contaminated soils required landfilling or on-site treatment.
The site was enrolled in the Oregon Department of Environmental Quality's Voluntary Cleanup Program and a No Further Action letter was obtained for the site.