Tuesday, June 24, 2008 : 11:20 a.m.
Case Study: Installation, Maintenance & Monitoring of an Oxygen Injection System Within a Residential Community
This paper presents a case study involving the installation of an oxygen injection system within a groundwater plume at a former Manufactured Gas Plant site. The general outline of this study can be divided into the following areas of interest: site history, remedial goals, system design and installation, system monitoring and maintenance, performance results, and future plans.
An oxygen injection system was installed as part of an Interim Remedial Measure to enhance bioremediation in groundwater within a dissolved phase contaminant plume. The groundwater plume originates from a former Manufactured Gas Plant site and extends approximately 3,400 feet to the headwaters of Lawrence Creek. The dissolved phase plume consists primarily of benzene, toluene, ethylbenzene, xylene, and polycyclic aromatic hydrocarbons.
The oxygen injection system is located within a commercial/residential community. The system consists of two injection lines, located over 1,000 feet apart, and a central treatment building that houses the oxygen generating equipment that distributes pressurized oxygen through the injection lines. The installation of the injection lines was challenging due to space limitations, vehicular traffic, and residential concerns about operations. These restrictions were overcome by planning out manpower and equipment needs for the job, and by maintaining communication with the community and local agencies.
This remediation project is currently in the monitoring and maintenance phase in order to determine the effectiveness of the oxygen injection. System monitoring includes quarterly chemical analysis of monitoring wells, monthly analysis of physical groundwater parameters, including dissolved oxygen concentrations, oxidation reduction potential, conductivity, pH, and temperature, and monthly monitoring and adjustment of oxygen injection flow rates and pressures.
The oxygen injection system has effectively created an aerobic environment with dissolved oxygen concentrations reaching over 40mg/L in downgradient monitoring wells. As a result significant reductions in contaminants of concern have been observed during the operation of the system.
Jeffery R. Parillo, GEI Consultants Inc. Mr. Parillo is a graduate of the University of Connecticut with a B.S. in Civil Engineering. He is an engineer that has four years of experience in the utility industry. His specialties include construction oversight, environmental sampling, and installation and monitoring of oxygen injection systems.
Kristin M. Hennessy, Fenley & Nicol Environmental Inc. Kristin M. Hennessy is a graduate of the University of Scranton with a degree in International Business. She is currently working towards her masters degree in Project Management with Keller University. Kristin is a project manager with six years experience in the environmental contracting industry. Her specialities include subsurface drilling investigations, installation and maintenance of remediation systems, and storage tank replacements.
Matthew J. O'Neil, PE, GEI Consultants Inc. Mr. O’Neil is a graduate of the United States Military Academy with a B.S. in Environmental Engineering. He is a practicing professional engineer and project manager with ten years of environmental consulting and remediation experience in the petroleum and utility industries. In addition, he has ten years of leadership and organizational experience as an officer in the U.S. Army and Army National Guard. His specialties include remedial engineering, construction oversight, and groundwater remedial systems design.
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Manuscript 2008 NGWA Conference on Eastern Regional Ground Water Issues