Orange County NC Website
05c, <br /> The natural terrain and vegetation will provide the Pri mary <br /> cleansing of pollutants on this site. The stilling basin with the <br /> rock dam section will provide secondary cleansing of pollutants. <br /> The low ratio of impervious material to vegetation (3.9%) is <br /> acceptable and should allow sufficient infiltration and settlement <br /> of pollutants to occur. <br />