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Benjamin Clement
Presenation Title
High Resolution Site Characterization and Rapid Implementation of Combined Remedy for Multiple Parcels with Evolving Property Usage
Benjamin Clement, R.G., C.P., Senior Geologist, Burns & McDonnel Engineering Company, Inc.
Abstract
Background/Objectives:
In 2019, Burns & McDonnell completed a high-resolution comprehensive site characterization at an MGP site in central Illinois under the Illinois EPA Site Remediation Program. On-site and surrounding property usage at the time of study completion was commercial industrial, with the majority of impacts present in more permeable glacial outwash sands located approximately 20-35 feet below ground surface. In January 2021, it was learned that an adjacent property was acquired for the development of an elementary school.
Approach/Activities:
A pilot study approach was designed as a less-disruptive alterative to the community to remedy source material impacts using a combined approach of mobile NAPL recovery, surfactant-enhanced product recovery, and in-situ chemical oxidation. HRSC techniques included usage of environmental sequence stratigraphy (ESS),TarGOST/EC/HPT probes, microbial population quantification, and nested monitoring wells combined with conventional soil and groundwater sampling.
Rapid investigation of the adjacent property began in March 2021 to evaluate potential off-site soil, groundwater, and vapor intrusion risks. Results were presented in April 2021, and a preliminary design to meet residential remedial objectives consisting of ISS and excavation issued to bidders in May 2021. Bidder selection is scheduled for the first week of July 2021 and remediation of the adjacent parcel is targeted for completion by early October 2021.
Results/Lessons Learned:
Pilot study implementation began in March 2021 with post-injection performance monitoring and confirmation sampling scheduled for completion in July 2021. Efforts to expedite the adjacent property remedy include pre-excavation confirmation sampling , submission of expedited ISS treatability samples prior to contract award, early and frequent involvement of the school development property stakeholders to align remediation design details with school property development requirements.
Bio
Mr. Clement is a senior geologist and project manager for Burns & McDonnell Engineering Company, Inc. out of the Chesterfield, MO (St. Louis) office where he has worked for over 14 years. He has a bachelor's degree in Geology from DePauw University and a masters degree in Hydrology and Water Security from the University of Oklahoma Gallogly School of Engineering. He has a background in site characterization, remediation alternatives evaluation, remedy planning, cost estimating, design and implementation. Ben has experience with a variety of sites impacted by former MGPs, CCR, refineries, fueling sites, and chlorinated solvents-with locations ranging from California, Idaho, Georgia, Great Plains, and the Midwest.