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Long-term Metal Performance of Three Permeable Pavements
Liu, J. AND Mike Borst. Long-term Metal Performance of Three Permeable Pavements. To be Presented at 2017 EWRI, Sacramento, CA, May 22 - 25, 2017.
Compare infiltrate metal concentrations with existing standards (1GELs and 2MCLs) Clarify whether winter deicing chemicals applied affect the infiltrate metal concentrations Identify the long-term pattern of infiltrate metal concentrations from permeable pavement
EPA constructed a 4,000-m2 parking lot surfaced with three permeable pavements (permeable interlocking concrete pavers, pervious concrete, and porous asphalt) on the Edison Environmental Center in Edison, NJ in 2009. Samples from each permeable pavement infiltrate were collected for six years beginning in January 2010 and analyzed for twenty-two metals. Although the infiltrate metals concentrations varied by surface, metal concentrations in more than 99% of the permeable pavement infiltrate samples met both the groundwater effluent limitations and maximum contaminant levels in national primary drinking water regulations for barium, chromium, copper, manganese, nickel and zinc. Arsenic, cadmium, lead and antimony met those standards in 60% to 98% of the samples with no measurable difference found among pavements. Aluminum and iron in pervious concrete and porous asphalt infiltrates met standards at more than 90%, however permeable interlocking concrete paver infiltrates have 50% and 93% samples exceeds standards, respectively. Concentrations of arsenic, iron, potassium, lithium, magnesium, antimony, tin, manganese, and zinc in all permeable pavement infiltrates decreased with time, whereas, aluminum, barium, calcium, chromium and strontium in porous asphalt infiltrates increased. Most metal concentrations in permeable pavement infiltrates either exhibited no significant difference between snow/no-snow seasons or showed statistically larger concentrations in the snow season. However, aluminum, silicon and vanadium in all three permeable pavement infiltrates, and copper and iron in permeable interlocking concrete paver infiltrates were larger in no-snow season. Antecedent dry periods is also an important parameter for some metals, which have the positive relationship with metal concentrations.