MEASUREMENT OF PCB FLUXES IN A LAMINAR FLOW FLUX CHAMBER FROM STABILIZED DREDGED MATERIAL Executive Summary Project Goals and Objectives The goal of this project was to measure directly the volatilization of gas phase polychlorinated biphenyls (PCBs) from stabilized dredged

The goal of this project was to measure directly the volatilization of gas phase polychlorinated biphenyls (PCBs) from stabilized dredged material (SDM) in a • laboratory scale flux chamber. This study complements earlier field observations (Phase I) to estimate PCB fluxes from SDM being applied to a landfill (Korfiatis et. al., 2003, Miskewitz et al, 2004). Phase I included measurements of the PCB concentration at two elevations above land-filled SDM and measurements of the required micrometeorological parameters to estimate the flux of PCBs from the land-fill surface using the aerodynamic gradient method. The variability of atmospheric and SDM characteristics at the landfill made quantification of the factors controlling rates of volatilization difficult. Phase II was initiated to measure PCBs volatilization from stabilized dredged material (SDM) under controlled laboratory conditions. In addition to controlling conditions, the Phase II experiments directly measured flux of PCBs using a mass balance approach rather than relying on an indirect method. PCB flux measurements were obtained for intervals of 2 to 12 hours over the length of each experimental run (typically 50 hours). During each experimental run air velocity, temperature and humidity, SDM temperature, and surface moisture content were monitored. The PCB flux measurements were then analyzed to determine their dependence on elapsed time, degree of stabilization, temperature, and soil or air moisture content.