Long-term Monitoring and Sustained Compliance
Global Industrial Technology Leader
Seacoast, New Hampshire
Client Challenge
A global industrial technology leader retained Aries to characterize and manage chlorinated volatile organic compound (CVOC) impacts identified in site soils exceeding applicable remediation standards during construction of a new manufacturing building addition. Available records indicated the CVOC impacts resulted from historical spills and releases associated with solvent above-ground storage tanks (ASTs), transfer piping, and railcar tankers. The affected areas are located within high-traffic zones currently used for cable product transport and raw material delivery.
Aries successfully:
Characterized the source and extent of CVOC impacts in soil, groundwater, surface water, and indoor air.
Developed a cost-effective Remediation Action Plan (RAP) for long-term management of the impacts.
Implemented a state-approved long-term monitoring program.
Comprehensive Solution
A one-day preliminary pilot test was implemented to evaluate Dual-Phase Extraction (DPE) and In-Situ Chemical Oxidation (ISCO) as candidate technologies for treatment of CVOC source areas. The technologies were compared based on treatment effectiveness, ease of implementation, projected time to achieve remedial objectives, and overall cost. From these tests, Aries concluded that DPE could not efficiently meet site-specific soil and groundwater remediation objectives, that extraction and injection-based technologies would not be sufficiently effective or cost-efficient, and that residual dense non-aqueous phase liquid (DNAPL) was present within each identified source zone.
Using these findings, Aries developed clear recommendations to guide the client’s long-term strategy. No additional testing, implementation of DPE, or other source treatment options were recommended for the unsaturated clay unit, with long-term monitoring of the underlying silty sand unit. Aries also recommended using the pilot test dataset to periodically reevaluate site conclusions and refine future remedial decision-making.
Beneficial Outcome
Aries’ thorough evaluations and pilot testing results provided the data needed to support a technical impracticability (TI) determination, which demonstrated that implementation of a long-term monitoring program would be just as effective as implementing currently available remedial technologies. Our client was able to meet stated environmental goals for renewables, greenhouse, waste management, and product impact with Aries assistance, while maintaining environmental compliance and reducing environmental reserve funding.