Cross Keys Airport

Williamstown, New Jersey
UST Removal and Long-Term Environmental Monitoring
(SIN 899-8 and 899-8 RC)

The owners of Cross Keys Airport retained Brinkerhoff Environmental Services, Inc. to manage the environmental remediation of underground storage tank (UST) systems at this busy airport facility in Williamstown, NJ. Contamination originating from the airport site and impacting groundwater was of significant environmental concern due the surrounding use of the unconfined surface aquifer for residential drinking water.

The project required registration and NJDEP closure approval for multiple USTs at the facility, and removal oversight of two 80-octane aviation fuel USTs that were found to have dime-size corrosion holes. More than 3,000 cubic yards of fuel-contaminated soil were removed from the excavation areas and managed as hazardous materials. A confirmed discharge of fuel, impacting both soil and groundwater, was reported to the NJDEP hotline and Brinkerhoff managed the case as per the Technical Requirements for Site Remediation (N.J.A.C. 7:26E). Additional former USTs were found on the airport property; therefore, Brinkerhoff directed multiple soil and groundwater Remedial Investigation Reports (RIRs) and Remedial Action Workplans (RAWs) to investigate discharges from tanks used to fuel jet aircraft. The project involved drilling of soil borings and monitoring wells, survey of the wells, well sampling, a receptor evaluation, preparation of a Baseline Ecological Evaluation (BEE), potable well sampling, and preparation of hydrogeologic maps. The project required efficient coordination with subcontractors, the NJDEP, and technical field personnel, and demonstrates Brinkerhoff’s ability to implement site-specific health and safety plans, direct subcontractors, manage hazardous waste projects, review NJDEP-certified laboratory data, prepare electronic data submissions for NJDEP review, and submit remedial action reports in conformance with local, state, and federal guidelines for regulated USTs. Brinkerhoff’s in-house CADD and GIS were used for field mapping and plotting of sample locations.

As part of the BEE, Brinkerhoff identified a potable well, used for the airport restaurant, located in an area of suspected groundwater contamination, but screened at a deeper interval than the free floating product. Brinkerhoff technical personnel evaluated and sampled the well during multiple events, then recommended the sealing and abandonment of the well. Well sealing was performed under Brinkerhoff’s on-site supervision.

Further remedial action was necessary, including the design, installation, operation and maintenance (O&M) of a groundwater treatment system and soil vapor extraction system to finalize the cleanup of contaminated materials on the site. Brinkerhoff has been providing O&M using several of our in-house certified N-2 operators. The system has been functioning efficiently, and will be shut down when the NJDEP approves a remedial action plan that recommends natural attenuation and a Classification Exception Area (CEA) deed restriction for the residual contamination on site.