Gradient

Environmental Cost Analysis

PRP Cost Recovery/Allocation

Overview
Example Projects
Experts

Overview

Gradient consults and testifies on a wide range of topics related to PRP cost recovery/allocation. Gradient's strong forensic and transport modeling skills, detailed knowledge of industrial history and the numerous approaches to allocation, and clear and compelling communication skills are instrumental to our work in this area. While our experience has taught us that every site and case is specific, our allocation work is predicated on scientifically sound, empirical analysis of the data and its relationship to cost and PRPs.

Example Publications:

Herman, KD; Wannamaker, EJ; Jegadeesan, GB. 2012. "Sediment PAH allocation using parent PAH proportions and a least root mean squares mixing model." Environ. Forensics 13:225-237.

Merrill, DE; Drivas, PJ; Butler, EL; Jegadeesan, GB. 2011. "Determination of PCB release time-frame using weathered congener and homolog fingerprints and a multicomponent evaporation model." Environ. Forensics 12(1):35-48.

Forensic Markers Attribution

Example Projects

PCB Sediment Remedy Cost Allocation

Full Description

For one paper company among several with historical PCB discharges, Gradient developed cost allocation strategies using Gore and other equitable factors in a cost contribution claim. Our allocation model considered the distribution of PCBs in river sediments, fate and transport modeling, and the operational history of the paper mills.

Great Lakes Sediment Superfund Site Cost Allocation

Full Description

Gradient developed a cost allocation for a Great Lakes Superfund site where sediments were contaminated from multiple historical sources, including manufactured gas plant (MGP) and wood-treating operations. Our allocation model examined historical operations and waste practices, PAH/NAPL contamination patterns, and contaminant mass/volume estimates.

Groundwater Plume Cost Allocation

Full Description

To allocate liability and costs associated with a large groundwater plume, Gradient modeled groundwater and contaminant transport and used chemical fingerprinting to estimate the contribution(s) of multiple sources. This approach enabled us to identify the sources of plumes that could have contributed contaminants to a public drinking water supply well field.

Cost Allocation for PCBs in Creek and Lake Sediments

Full Description

Gradient evaluated the spatial distribution and fingerprint of PCB contamination in creek and stream sediments to assess the degree to which our client contributed to PCB contamination in stream and downstream lake sediments. Our analysis was used in the allocation negotiations of multiple PRPs.

Experts

Andrew B. Bittner Read Bio

Teresa S. Bowers Read Bio

Kurt Herman Read Bio

David E. Langseth Read Bio

David E. Merrill Read Bio

Manu Sharma Read Bio