Public Water Supply Protection During MGP Site Remediation – Developing a Contingency Plan in a Post Flint World


Public Water Supply Protection During MGP Site Remediation – Developing a Contingency Plan in a Post Flint World

Timothy Olean (Natural Resource Technology, Inc. (NRT) an OBG Company)
Maribeth McCormick (Orange and Rockland Utilities)
Tim Silar, PG (Silar Services, Inc.)
Mark Williams, PG (Sterling Environmental Engineering, P.C.)
James Edwards, PG  (GEI Consultants, Inc.)


Timothy Olean

Natural Resource Technology, Inc. (NRT) an OBG Company

Speaker Bio:

Mr. Olean has 27 years’ experience in environmental remediation project management including estimating, design, scheduling and implementation oversight. He has managed in excess of $275,000,000 of complex remediation projects. In addition to his technical roles he has also served in leadership roles ranging from department head and office manager to practice leader and Vice President. He specializes in remedial strategy, remedy selection and evaluation, constructability review, design and construction management on environmental projects focusing on former industrial sites including manufactured gas plants, refineries, railroads and manufacturing facilities. He has lead efforts for treatability, pilot studies, design, regulatory negotiation and implementation of 18 in situ solidification remedies on coal tar and wood treating sites and has also lead an effort with an electric power industry group and the USEPA to develop an emerging sediment remediation technology using in-situ solidification on coal tar impacted sediments. He has worked closely with clients and both national and state regulators to plan and implement sensitive site clean-up projects.


NRT, an OBG Company, and its partners Silar Services, Sterling Environmental Engineering and GEI Consultants developed a groundwater monitoring plan prior to initiating site remediation to allow for early warning and contingency plan implementation to protect nearby existing and permitted municipal supply wells. The Orange and Rockland Utilities (O&R) former Suffern New York Manufactured Gas Plant Site sits approximately 400 feet from the Suffern Well Field that extract, approximately 1.8 million gallons per day (MGD). Planned remediation consisted of excavation and in-situ solidification(ISS) to address the MGP impacts. Impacted groundwater conditions at the Site have been stable based on over 18 years of regular monitoring. While the expectation that remediation-influenced changes to groundwater conditions would be minimal, the potential existed for some localized variability to occur during the remedial action which included ISS and excavation of impacted material and structures. Due to the Site’s proximity to the Well Field O&R sought to take measures that would allow for extensive monitoring and quick action if changes in groundwater quality were observed. A monitoring and contingency plan was developed to outline three levels of response, including; increased monitoring at specific distances and select vertical zones between the remedial activity and the Well Field; installation of groundwater treatment contingency measures (i.e., biosparging system) that could be enacted quickly if the plume was observed to be advancing toward the Well Field; and, establishment of an alternative water supply should the unlikely event that impacts reach the Well Field. Decision rules were developed and approved by all stakeholders to direct potential changes to the Groundwater Monitoring Plan (GWMP) as needed. This presentation will provide information on the Site, contingency measure details, and describe the protocols used to develop an acceptable plan to O&R, the state and local stakeholders. Results observed during site remediation (completed in 2016 & 2017) will also be presented.

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

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