Investigation of Water Quality in Runoff from Stockpiles of Salvaged Concrete andBituminous Paving

摘要

The Stockpile Runoff Project addressed environmental concerns regarding thequality of runoff water from salvaged pavement stockpiles. Three experimental stockpiles were studied, one pile consisted of coarse concrete, a second consisted of fine concrete material, and the third consisted of salvaged bituminous material (recycled asphalt product) obtained from a pavement milling project. The leachate water from the piles flowed through a sampling and flow monitoring system with data loggers and automated sequence samplers. Composite water samples were analyzed using EPA approved methods and quality control protocols. Comparing the observed median values for the stockpile runoff with Minnesota standards for surface waters, the pH exceeded and chromium may have exceeded the standards.