LNAPL was seeping and discharging into a culvert structure that bisected an approximate 30-arce light non-aqueous phase liquid (LNAPL) body impacting both perched and lower aquifer groundwater due to decades of rail yard operations.
A site in East Whiteland Township, Chester County, Pennsylvania operated as a solvent reclamation facility from 1952 to 1992. A wooded area surrounded by residential and undeveloped areas bordering the property, the project site consists of a main plant area (MPA) connected to a former disposal area (FDA) by a narrow meadow corridor. Chemclene used a distillation process to remove impurities from the previously used solvents; prior to 1976, sludge from the distillation process was disposed in the FDA. The former processing, chemical storage, and waste management practices at the property have led to solvent contamination in the soil and groundwater. Site remedies included an Accelerated In-Situ Bioremediation (AISB) system in the MPA, and soil vapor extraction (SVE) at the FDA. In its Five-Year Review, the United States Environmental Protection Agency (USEPA) questioned the long-term effectiveness of the SVE system and requested additional investigaton to support revisions to the Conceptual Site Model (CSM) in the FDA.
Brunner Island is a three-unit, coal-fired plant owned by PPL Generation, Inc., and located on the west bank of the Susquehanna River. The plant constructed a 130-car rail line extension and storage yard atop a closed coal ash pond. Geosyntec was retained to design and implement a test fill program, prepare and implement a field sampling program, and analyze and conduct preliminary analyses of foundation performance.
At this site, TCE DNAPL is present in highly fractured bedrock that is currently used by the local municipality as a drinking water supply. In summer 2001, the U.S. EPA issued a Preferred Remedial Action Plan (PRAP) for the site, primarily consisting of pump and treat remedy components for both the source area and the plume. The Client retained Geosyntec to demonstrate to U.S. EPA and the Pennsylvania Department of Environmental Protection (PADEP) that pump and treat would not result in remediation of the source area within any reasonable timeframe.
A Fortune 100 company requested that Geosyntec provide a technical assessment and evaluation of a 2,200-foot long gabion-faced combination gravity and mechanically stabilized earth wall at one of its major distribution centers in the eastern United States. Other retaining structures on the project site experienced significant movements or collapse. Previous consultants expressed concern regarding the long-term stability and distress for this wall such that the owner would be required to initiate major rehabilitation activities to stabilize it. The owner was actively considering complete wall rehabilitation at an estimated cost of $2.5 million.
Geosyntec was retained by a confidential University client in the Philadelphia area to provide air quality consulting assistance to modify the University's air quality permit and develop a compliance tracking tool for the facility.
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