Preventative Groundwater Treatment - Aggressive Source Area Chemical Oxidation

Monday, December 4, 2017: 1:30 p.m.
102 A (Music City Center)
Patrick Hicks , Soil and Groundwater Remediation, PeroxyChem, Raleigh, NC
Tom Couste, P.E. , JESCO Environmental & Geotechnical Services, Inc., Jennings, LA
Alvinette Teal, P.G. , JESCO Environmental & Geotechnical Services, Inc., Jennings, LA

An aggressive source area chemical oxidation application was used as a preventative measure for continuing groundwater contamination at a former bulk fueling facility. Historical operations since the 1940’s resulted in wide-spread distribution of primarily fuel hydrocarbons. Initial remedial investigations comprised of 44 borings to a depth of 7.6 m revealed contaminant mass distribution was restricted primarily to surface soils. However, the contaminant mass was distributed over a relatively large (750 sq m) area of surface soils, potentially endangering the shallow groundwater quality beneath the area due to percolating rainfall. The area could not be addressed with excavation as active rail spurs straddle the east and west boundaries. Total Petroleum Hydrocarbons Diesel range (TPH-D) concentrations in surface soil approaching 14,500 mg/kg was the primary focus for contaminant mass destruction.

A corrective measures study recommended application of In Situ Chemical Oxidation (ISCO) using activated Klozur SP sodium persulfate to destroy residual TPH-D mass. A Soil Oxidant Demand (SOD) test was performed on soil and groundwater from the site to ensure sufficient oxidant would be applied to address both the non-target and target demands. Appropriate permitting for injections was secured. Preparation of field equipment, including injection well installation was completed prior to injection. The first injection of approximately 94,635 liters of 20% Klozur SP and 20 % NaOH solution was performed in 2016, followed by monitoring of oxidant persistence for 60 to 90 days. Subsequent TPD-D monitoring indicated a concentration reduction between 50% and 95% in treated soils. The TPH-D mass reduction was more pronounced along the perimeter of the targeted injection area. A second round of ISCO injections focused on the remaining TPH-D mass is planned, and results will be presented.

Patrick Hicks, Soil and Groundwater Remediation, PeroxyChem, Raleigh, NC
Patrick Hicks is the Technical Sales Manager for PeroxyChem, formerly FMC Environmental Solutions. He has more than 25 years of experience in applied microbiology, with significant experience in the design and implementation of a variety of environmental remedial technologies. Research and development of technologies has been conducted in laboratory, field pilot scale and full scale; however, he has focused on application of technology in the field. Hicks has supported numerous injection projects in the United States, South America, Australia, and Europe. The spectrum of injection sites supported includes aquifers ranging from sands to clays, and diverse product placement including electron donors, electron acceptors, and chemical oxidants.

Tom Couste, P.E., JESCO Environmental & Geotechnical Services, Inc., Jennings, LA
Mr. Couste is a professional engineer with JESCO Environmental & Geotechnical Services, Inc. He is responsible for program management and oversight of projects in the Gulf Coast Region.

Alvinette Teal, P.G., JESCO Environmental & Geotechnical Services, Inc., Jennings, LA
Ms. Teal is a project manager at JESCO Environmental & Geotechnical Services, Inc. She is responsible for all aspects of project execution at sites across the Gulf Coast Region.

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National Ground Water Association
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