WATER-QUALITY OF STORMWATER RUNOFF FROM 10 INDUSTRIAL SITES

This study was to designed to determine concentrations of selected met als, organic compounds, pesticides, and conventional pollutants in sto rmwater runoff from two North Carolina businesses in each of the follo wing five general industrial groups: auto salvage, metal fabrication, scrap and recycling, vehicle maintenance, and wood preserving faciliti es. The sampling procedure involved collecting a first flush sample of runoff from a single storm event and both first flush and composite s amples of runoff from three consecutive storm events. Analysis of samp les collected during the first flush indicated that zinc and copper we re the most common of the 13 metals included in the analysis. Addition al analysis documented that several volatile organic, semi-volatile or ganic, or pesticide compounds including acrolein, methylene chloride, xylenes, toluene, tetrachloroethylene, trichloroethylene, pentachlorop henol, and aldrin were also found in the first flush samples. Concentr ations of aggregate organics, nitrogen, phosphorus, and sediment were determined in both first flush and three-hour composite samples. Conce ntrations of pollutants in first flush samples were similar to those i n corresponding composite samples.