EXH0716026434

:'--J Influence of Highway Runoff Chemistry, Hydrology and Residence Time on Non-Equilibrium Partitioning of Heavy Metals -Implications for Treatment at the Highway Shoulder Donald W. Glenn M t, Dingfang Liu', end John J. Sansalone, Ph.D., P.E.2 (corresponding author) tLouisiana State University, Department of Civil and Environmental Engineerh_ 3502 CEBA Building, Baton Rouge, Louisiana 70803-6405; 225.578.8652 (fax) 2Louisiana State University, Depertment of Civil and Environmental Engineering, 3502 CEBA Building, Baton Rouge, Louisiana 70803-6405; 225.578.6047 (office); 225.578.8652 (fax) Word Count: 5000 text and 2500 for tables and figures ABSTRACT The control and trcamumt of highway pavement storm water at the edge of the highway shoulder pose unique challenges due to the unsteady nature of processes including rainfall runoff, mobiiiTAtion and partitio_in_ of heavy metals, variations in storm water chemistry, residence time on the pavement and delivery of particulate mass. This study presents heavy metal partitioning results as influenced by pavement runoffohemistry end hydrologic parameters i_om a series of eight rainfall runoff events over a two-year period. Water quality charactefi_'cs such as low alkalinity, low hardness and short pavement residence times results in a majority of the heavy metal mass f.-.. remaining in solutionat the edge ofthepavement with partitioning coefficients only approaching equilibriem conditionstowardstheendoftheeventasheavymetaLspartitiontoentrainedsolids. There are two pr;m.ry imp]icatiuns when considering the application of typical bestmanagementpractices (BMPs) for highway runoff within the fight-of-way. The first implication is to utilize a BMP such as a detention basin or roadside swaleto detainrunoff end produce sufficient residencetime sothat partitioning to the entrained solids occurs. The second…

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