October 22, 2002August 2, 2026

Exhibit AR 026434: Influence of Highway Runoff Chemistry, Hydrology and Residence Time on Non-Equilibrium Partitioning of Heavy Metals – Implications for Treatment at the Highway Shoulder

Notes

Academic paper by Donald W. Glenn III, Dingfang Liu, and John J. Sansalone (Louisiana State University, Department of Civil and Environmental Engineering) examining heavy metal partitioning in highway storm water runoff. Study conducted at an instrumented experimental site on Interstate 75 in urban Cincinnati over eight rainfall runoff events across two years. Analyzes Zn, Cu, Cd, Pb, Cr, and Ni concentrations and partitioning behavior as influenced by low alkalinity, low hardness, short pavement residence times, and hydrologic parameters. Finds heavy metal mass predominantly remains dissolved at highway shoulder edge under non-equilibrium conditions. Discusses best management practices (BMPs) including detention basins, roadside swales, and engineered infiltration trenches. References NPDES Storm Water Phase I and Phase II Final Rule (February 2000). Document identifier AR 026434.

Sidebar On/Off

As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

continue...

V V

Notes

Message