As part of consecutive consulting services agreements, Duffield Associates has provided geoscience consulting services to the Delaware River & Bay Authority (DRBA) for more than seven years. Services have included geotechnical engineering, environmental services, structural engineering, civil, and construction review services.

Energy Audit/Renewable Energy Feasibility Study
DRBA1Duffield Associates completed an energy audit and renewable energy feasibility study for DRBA’s main facility. The audit included schematic-level modeling to assess potential equipment upgrades, operational changes, and building improvements for beneficial energy conservation and cost reductions. The use of solar, geothermal, wind, water and used oil to meet identified heating, cooling, and electricity demands was assessed. The audit considered potential output, logistical constraints, costs, funding, permitting and cost/benefits.

Time Sensitive Ferry Asbestos Abatement
Due to the potential for damage to asbestos-containing pipe insulation on engine, generator, and boiler lines, the Delaware River and Bay Authority required delineation and removal of asbestos-containing insulating materials located on the MV New Jersey. This project was time-sensitive as the vessel is part of the Cape DRBA2May-Lewes Ferry. Duffield Associates conducted sampling and analysis of insulating materials, assisted with specifications for the abatement, reviewed bid responses and provided oversight during the abatement. This project completed on time and did not adversely affect the ferry schedule.

Multi-Purpose Building, Millville Airport, New Jersey
Duffield provided engineering consulting and construction review services for a new Tenant, Multi-Purpose Building at the Millville Airport. These services included geotechnical laboratory testing, review of subgrade conditions, compaction testing, review of reinforcing steel for foundation construction, concrete testing, structural steel review of pavement construction, and construction consultation.

Environmental Improvements
Our team reviewed environmental conditions at New Castle Airport, Delaware Airpark, Lewes Ferry Terminal, Freeman Highway Annex, Delaware Memorial Bridge Complex, Millville Airport, Cape May Airport, and Cape May Ferry Terminal. Four areas of environmental improvements were 1) underground storage tank management, 2) aboveground storage tank registration, 3) Spill Prevention Control and Countermeasure (SPCC) planning, and 4) industrial stormwater management planning. Duffield prepared UST O&M Plans, SPCC plans, and stormwater plans. The team provided training to DRBA personnel for the plans developed. Spill containment systems were also designed by Duffield. Groundwater environmental conditions were reviewed through monitoring wells installed at two airports and the Bridge Complex.

Trucking Terminal, New Castle Airport
Prior to terminal demolition, Duffield was engaged to conduct Phase I Environmental Site Assessments/Preliminary Site Assessments including environmental inventories. Subsequent Remedial investigation included groundwater investigations, soil, groundwater and sediment chemical sampling, testing, and analysis, preparation of baseline risk assessments, preparation of conceptual site models, preparation of Feasibility/Corrective Hazardous, Toxic, and Radiological Waste (HTRW) Measures and Studies, and preparation of Health and Safety Plans. Several environmental conditions were identified, such as asbestos-containing materials, underground storage tanks (USTs), and historic fill materials. Pre-demolition asbestos surveys were conducted and specifications developed for asbestos abatement. Duffield Associates assisted with bid solicitation, removal and management of asbestos-containing materials and documented those removals.

Maintenance Hangars, Millville Airport, Indoor Air Quality
To address findings of on-going Remedial Investigations and worker safety Indoor Air Quality (IAQ) analyses were conducted on an expedited schedule at two maintenance hangars. Air quality sampling, testing, and analyses for volatile organic compounds followed the New Jersey Department of Environmental Protection (NJDEP) protocols and USEPA Method TO-15. Analyses were conducted by a laboratory working under an Environmental Laboratory Accreditation Program (ELAP), and data were generated in NJ Hazsite format with electronic data deliverables (EDD).