Status Update: Development of MGP-Specific Database to Support DNAPL Mobility Assessments at MGP Sites


Status Update: Development of MGP-Specific Database to Support DNAPL Mobility Assessments at MGP Sites

David V. Nakles, Ph.D., P.E. (The CETER Group, Inc.)
Jeffrey Clock (Electric Power Research Institute (EPRI))
Nicholas A. Azzolina (Energy and Environmental Research Center)



David V. Nakles, Ph.D., P.E.

The CETER Group, Inc.

Speaker Bio:

Dr. David Nakles has a Ph.D. in Chemical Engineering and Engineering and Public Policy from Carnegie Mellon University. Dr. Nakles has been a practicing environmental consultant for over 40 years, concentrating on the environmental management of residuals generated during the extraction and processing of coal, oil, and natural gas, with an emphasis on the characterization and remediation of contaminated sites associated with the manufactured gas industry of the 19th century. Dr. Nakles is a co-editor of two books: (1) Management of Manufactured Gas Plant Sites and (2) Environmentally Acceptable Endpoints in Soil — A Risk-Based Approach to Contaminated Site Management Based on the Availability of Chemicals in Soil and a contributing author to two other books, “Cyanide in Water and Soil – Chemistry, Risk, and Management” and “Risk-Based Decision Making for Assessing Petroleum Impacts at Exploration and Production Sites”. In June, 2009, Dr. Nakles set up his own private consulting practice, which was formally incorporated as The CETER Group, Inc., in July 2012. Dr. Nakles is also employed part-time as a principal environmental engineer by the Energy and Environmental Research Center of Grand Forks, ND, and is an adjunct professor in the Department of Civil and Environmental Engineering at Carnegie Mellon University in Pittsburgh, PA.


EPRI-sponsored research has shown that when DNAPL is present in the subsurface at an MGP site, a principal issue related to site closure is an assessment of its mobility. In the absence of a quantitative approach for differentiating between mobile and immobile DNAPL, environmental regulators are prone to make the conservative assumption that all DNAPL identified in the subsurface is potentially mobile, thereby precluding environmental closure of the site until the subsurface DNAPL is removed or otherwise managed. To overcome this barrier to site closure, EPRI developed a generic work plan which presents a standardized technical protocol that can be used to quantitatively differentiate between mobile and immobile DNAPL at a MGP site. This presentation provides an update of a current EPRI project which is generating an MGP-specific, multi-site DNAPL mobility database using this DNAPL mobility assessment technical protocol. EPRI’s goal is to assemble additional data from site-specific DNAPL mobility assessments and to integrate these data into the DNAPL database that EPRI previously developed as part of prior EPRI DNAPL studies. A multi-level analysis of the multi-site database will then be conducted to provide an initial evaluation of DNAPL- , porous media-, geologic-, and hydrology-specific factors that may affect DNAPL mobility at MGP sites. The database has been constructed to accommodate DNAPL mobility data from additional MGP sites in the future, which will allow for further examination of the relationships between DNAPL mobility and DNAPL/site characteristics.


To view the full Agenda for MGP 2017 view this link:

Developed by Autograph Media Group