Continuing Comprehensive Engineering Services for Municipal Parks and Waterfront Structures
Since 2001, Geosyntec has supported the City of Jacksonville’s inland and waterfront projects.
Remediation and Other Environmental Services at the Northside Generating Station
JEA’s Northside Generating Station has supplied electrical power to the City of Jacksonville since the 1960s and currently operates three boilers and four combustion turbine generators. Prior Resource Conservation and Recovery Act (RCRA) investigations detected impacts to groundwater, surface water, soil, and sediments at multiple solid waste disposal areas.
Remediation and Other Environmental Services at the Northside Generating Station
JEA’s Northside Generating Station has supplied electrical power to the City of Jacksonville since the 1960s and currently operates three boilers and four combustion turbine generators. Prior Resource Conservation and Recovery Act (RCRA) investigations detected impacts to groundwater, surface water, soil, and sediments at multiple solid waste disposal areas. Contaminants of concern included arsenic, nickel, and vanadium. JEA selected Geosyntec to provide corrective measures and related environmental services in response to a RCRA Consent Order.
Treatability Studies to Demonstrate the Effectiveness of an In Situ Technology to Treat PFAS
The remediation of sites impacted by per- and polyfluoroalkyl substances (PFAS) is a formidable challenge due to the complex mixture of hundreds of PFAS present in aqueous film-forming foams (AFFF), a major source of PFAS in the environment. Other treatment challenges include low (part per trillion) levels of concern, complexity of PFAS transformations, limited analytical capabilities, and the inherent stability of many perfluoroalkyl substances including perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA). The current best available technologies, pump-and-treat using granular activated carbon (GAC) or ion exchange, are expensive and require long timeframes; developing a less costly in situ option would be a significant breakthrough. The goal of this ongoing project is to evaluate the efficacy of using in situ thermally-enhanced persulfate oxidation to degrade PFOA and other perfluorinated carboxylic acids (PFCAs), as well as a significant "hidden" long-term source of known PFCA precursors that degrade slowly over time in the environment to form PFCAs. The technology is not expected to oxidize PFOS and other perfluorinated sulfonic acids (PFSAs), so in situ persulfate oxidation would need to be paired with groundwater extraction and ex situ treatment. Using in situ persulfate oxidation in the source zone prior to pump-and-treat would remove source area mass to the extent practicable and may decrease life-cycle costs and duration of treatment.The goal of this ongoing project is to evaluate the efficacy of using in situ thermally-enhanced persulfate oxidation to degrade PFOA and other perfluorinated carboxylic acids (PFCAs), as well as a significant "hidden" long-term source of known PFCA precursors that degrade slowly over time in the environment to form PFCAs. The technology is not expected to oxidize PFOS and other perfluorinated sulfonic acids (PFSAs), so in situ persulfate oxidation would need to be paired with groundwater extraction and ex situ treatment. Using in situ persulfate oxidation in the source zone prior to pump-and-treat would remove source area mass to the extent practicable and may decrease life-cycle costs and duration of treatment.
Herbert Hoover Dike Rehabilitation – “WallTracker”
Geosyntec developed the WallTracker system to allow USACE and the Contractor immediate and interactive access to field and laboratory data collected during a large-scale diaphragm-wall installation.The Herbert Hoover Dike (HHD) rehabilitation project is designed to stabilize and secure the aging dike from potentially damaging severe weather events, and protect the numerous residents and businesses on the southeastern rim of Lake Okeechobee.
Rapid Assessment and Removal of Coal Combustion Products JEA St. Johns River Power Park Area II Landfill
The JEA St. Johns River Power Park is a 1,260-MW coal and petroleum coke fired power plant located in Jacksonville, Florida. Coal combustion products (CCPs) generated at the facility are disposed in an on-site CCP landfills. Stormwater (also referred to as “contact water”) from the Area II CCP Landfill discharged to a single retention pond where suspended CCPs were allowed to settle before the contact water was pumped to the facility’s industrial wastewater treatment system. As part of the Area II CCP Landfill Final Closure, the Florida Department of Environmental Protection (FDEP) required that JEA clean close the retention pond and provide documentation that all CCPs had been removed from the pond.
Preparation and Implementation of Contamination Assessment Plan for Historical Park Impacted by Former Manufactured Gas Plant Operations
The City's Confederate Park, a park of historical significance, is located in downtown Jacksonville. The park has been impacted by operations from the former Main Street manufactured gas plant (MGP), operated from 1875 to 1913, when MGP operations reportedly ceased. Coal tar and its constituent PAHs were found in subsurface soils and groundwater. As a result, Florida Department of Environmental Protection (FDEP) NE District issued a Consent Order for Confederate Park, and the City retained Geosyntec to prepare and implement a Contamination Assessment (CA) Plan. The objective of CA was to evaluate hydrogeological conditions, define the distribution of tar and PAHs in the subsurface, characterize release/leaching potentials, predict the transport and fate of dissolved PAHs in groundwater, and provide preliminary evaluations of remedial alternatives.
