M.J. Bradley & Associates implemented a project with the Port Authority of New York and New Jersey (PANYNJ) that resulted in the deployment of advanced diesel particulate emission controls on construction equipment operating at the World Trade Center.

Two Caterpillar 966G front-end loaders were retrofit with diesel particulate filters (DPF), manufactured as a direct fit replacement by Caterpillar. Successful retrofit required the deployment of ultra-low sulfur diesel (ULSD) fuel in the loaders; a portable 2,000 kW Caterpillar generator was also fueled with ULSD as part of the project. The project was documented in a technical report demonstrating the feasibility, logistics path and cost effectiveness of fuel switching and deployment of emission control devices on select construction equipment.

MJB&A's role in the project included determination of DPF viability, cost-benefit analysis compared to other diesel PM reduction technologies, DPF procurement and installation oversight, emission testing, and program documentation via a technical report. To limit exposure to risk of failure, MJB&A undertook engine data logging and concurrence of retrofit suitability with the equipment manufacturer. In addition, documentation from the engine manufacturers to maintain the engine warranty after installation of an aftertreatment device was secured.