U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

EPA Region 2 Forty Years to the Finish - A Case Study of Combe Fill South Landfill Superfund Site

Sponsored by: Society of American Military Engineers (SAME) Denver Post, SAME Philadelphia Post, and US EPA

Archived: Wednesday, January 13, 2021
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The Society of American Military Engineers (SAME) Denver Post and Philadelphia Post along with the US Environmental Protection Agency (EPA) are hosting a series of webinars based on talks given at recent Design and Construction Issues at Hazardous Waste Sites (DCHWS) Symposiums. The mission of the DCHWS symposiums is to facilitate an interactive engagement between professionals from government and the private sector related to relevant and topical issues affecting applications of engineering and science associated with cleaning up hazardous waste sites. The symposiums also serve as a platform to facilitate the exchange of information, encourage dialogue, share experiences, and build and enhance communication among design and construction professionals. This presentation is a case study of Combe Fill South Landfill Superfund Site listed on the NPL in 1983 with a record of decision (ROD) in 1986, explanation of significant differences (ESD) in 2000 and amended ROD in 2018. HDR and its predecessor company LMS have been working on this site since its NPL listing in 1983. The presentation will highlight:

  • How advancements in high resolution analytical and geophysical methods over this time period had a bearing on the original conceptual site model (CSM), and how the application of evolving technologies resulted in investigative and design improvements to achieve the site's remedial action objectives (RAOs).

  • How the appearance of emerging contaminants - namely 1,4-dioxane - took the remediation timeline through a detour and how delineation and ultimate treatment of emerging contaminants, including PFCs, became the most significant component of this site's history.

  • The data and decision-making process resulting from numerous bench and pilot scale studies for 1,4-dioxane treatment, as well as various innovative and tried-and-true hydrogeologic evaluations in fractured rock.

  • The use of new design technologies and software (e.g. LiDAR, Autodesk Recap, Autodesk Revit, BIM 360, etc.) to create a 3D model of the existing groundwater treatment facility, evaluate the potential reuse vs new design, and ultimately complete a new treatment facility design

Upcoming 2020 Design and Construction at Hazardous Waste Sites Virtual Symposium Panel Sessions

Design and Construction Issues at Hazardous Waste Sites (DCHWS) Series Archives

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It is EPA's policy to make reasonable accommodation to persons with disabilities wishing to participate in the agency's programs and activities, pursuant to the Rehabilitation Act of 1973, 29 U.S.C. 791. Any request for accommodation should be made to Kate Garufi at 703-517-5857 or, preferably one week or more in advance of the webinar, so that EPA will have sufficient time to process the request. EPA would welcome specific recommendations from requestors specifying the nature or type of accommodation needed. Please note that CLU-IN provides both alternate phone call-in options and closed captioning for all webinars, and requests for these specific accommodations are not necessary.

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A photograph of Patricia Parvis, LSRP, PGPatricia Parvis, LSRP, PG
Patricia is a Vice President, Professional Associate and Senior Project Manager at HDR with over 26 years of experience, specializing in managing large Remedial Investigations/Feasibility Studies (RI/FS), Remedial Design (RD), Remedial Action (RA) and Operation and Maintenance (O&M) projects for federal and state Superfund programs in New Jersey and New York. She is well-versed in both New Jersey and New York site remediation regulatory programs and is also proficient in obtaining federal and state permits in support of remedial actions at sites with ecological resources. She collaborated on the design, and managed construction of an industry-first sediment cap having no permanent or temporary impacts to riparian resources. For the last 10 years, she has investigated sites and evaluated remedial technologies for emerging contaminants such as 1,4-dioxane. Patricia completed a successful pilot test for a proprietary technology to treat 1,4-dioxane at a fractured bedrock Superfund site. She has experience using forensic analyses, such as 3-D CSIA, to distinguish between chlorinated solvent sources in co-mingled groundwater contamination plumes. Her presentations focus on non-traditional investigation and remediation technologies such as "Application of Magnetometric Resistivity to Locate Preferential Flow Pathways in Fractured Rock," at the 2015 Design and Construction Issues at Hazardous Waste Sites Symposium, and "Preserving Environmentally-Sensitive Natural Resources during Remedial Actions" at the May 2018 USACE SAME Joint Engineer Training Conference.

A photograph of Andrew Wadden, LSRPAndrew Wadden, LSRP
Andrew Wadden is a Licensed Site Remediation Professional and project manager at HDR with over 15 years experience in the environmental consulting industry. Andrew has a M.S. in environmental studies from the University of Massachusetts-Lowell and B.S. in chemistry from Fairfield University. He has been working on the Combe Fill South Landfill Superfund site since 2010 with the OU2 RI phase and continued involvement through the PDI and RD phases of work.

A photograph of Andrew Watson, P.E.Andrew Watson, P.E.
Andrew Watson is a licensed Professional Engineer and Project Manager at HDR. He has over 12 years of experience in the environmental consulting industry supporting remedial investigations, remedial designs and implementations and remedial process optimization projects. Mr. Watson has a M.S. in Environmental Engineering from the New Jersey Institute of Technology and a B.S. in Environmental Systems Engineering from Penn State.

A photograph of Pamela BaxterPamela Baxter, EPA Region 2
Pamela J. Baxter, Ph.D., CHMM, is an environmental engineer who has worked for the U.S. Environmental Protection Agency, Region 2, Superfund Emergency Management Division for the past 30 years. Her experience has been working as a remedial project manager by managing various superfund hazardous waste sites located in New Jersey. She is a certified hazardous materials manager, a member of the Institute of Hazardous Material Management, and a Member of Alliance of Hazardous Materials Professionals. She also serves as an assistant safety officer for EPA's Emergency Response Corps.

She is also a co-leader of EPA's CCNY Alumni Group and helps organize informational sessions for students to consider a career at EPA.

Pamela earned her B.E.M.E degree in Mechanical Engineering from the City College of the City University of New York (CUNY), a M.S. degree in Environmental and Occupational Health Sciences from Hunter College of CUNY, a M.S. degree in Environmental Engineering from NJIT, M.S. degree Construction Management from Stevens Institute of Technology, and she received her Ph.D. degree in Civil Engineering from Stevens Institute of Technology. In addition to working for EPA, she is an adjunct assistant professor at the City College of the City University of New York.


A photograph of Jean BalentJean Balent, U.S. EPA Technology Innovation and Field Services Division ( or 202-566-0832)
Ms Balent is on the staff of the EPA's Technology Innovation and Field Services Division where she has worked to collect and disseminate hazardous waste remediation and characterization information since 2003. Ms Balent manages the Clean Up Information Network website and actively supports online communication and collaboration resources available to EPA. She formerly worked with the US Army Corps of Engineers Environmental Engineering Division in the Buffalo District. Ms Balent was also a member of the SUNY-Buffalo Groundwater Research Group where she constructed and tested large scale models of groundwater flow. Ms Balent has also conducted research relating to the Great Lakes, environmental remediation, and brownfields re-development. She holds a Bachelor's degree in environmental engineering from SUNY-Buffalo and a Master's degree in Information Technology from AIU.

A photograph of Kate GarufiKate Garufi, EPA OSRTI ( or 703-517-5857)
Kate Garufi, a project management professional, is the Rocky Mountain region remediation lead for HDR based out of Denver, Colorado. In this role, Kate partnerswith federal clients, including the U.S. Environmental Protection Agency and U.S. Army Corps of Engineers, and industrial clients on complex remediation projects. Prior to joining HDR, Kate spent 16 years at the EPA Headquarters in the Office of SuperfundRemediation and Technology Innovation. At EPA, she was a Superfund program expert in Superfund site management, design and construction project delivery, and technical project scoping. She holds a master's degree in environmental engineering from John Hopkins University and a bachelor's degree in chemical engineering from Virginia Tech

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If you have a suggested topic or idea for a future CLU-IN internet seminar, please contact:

Jean Balent
Technology Integration and Information Branch

PH: 202-566-0832 | Email:
Michael Adam
Technology Integration and Information Branch

PH: 202-566-0875 | Email: