Environmental Cost Estimation

Gradient evaluated the cost related to decontaminating tanks containing PCB-contaminated oil to determine whether it exceeded the range of what was considered reasonable and necessary. We developed an independent cost estimate for the work scope, evaluated cost estimates prepared by others at the time the work was performed, and evaluated the cost documentation intended to support the claim.

Gradient evaluated the activities and expenditures related to remedial investigations conducted for four sediment remediation projects. We reviewed technical documents, consent orders, contract agreements, and invoices to determine whether consultant fees could be identified as defense-related costs.

Gradient prepared environmental liability cost estimates for a portfolio of utility sites. We used probabilistic cost modeling tools to develop a total cost distribution, cash flow forecast, and expected value for each site. Our approach provided a framework to address the uncertainty in estimating contingent liabilities and allowed the disclosure of defensible, representative estimates of the liabilities.

Gradient evaluated the need for and environmental liability costs associated with a US EPA-led, time-critical removal action for a former MGP site. We identified critical gaps in the site data and suggested a revised investigation and remedial approach. We used probabilistic cost modeling tools to develop a range of cost estimates for the proposed remedial actions.

Gradient evaluated the basis for a proposed natural resource damage (NRD) settlement offer at a Great Lakes Superfund site. Using benchmarking analysis techniques, we quantitatively compared NRD settlements at other sediment sites to our client's offer, and we considered the nature and extent of the ecological harm and our client's role in releases that caused it.