Dust from clearing, grading, and other construction activities shall be minimized at all times. Impervious surfaces on or near the construction area shall be swept, vacuumed, or otherwise maintained to suppress dust entrainment. Any dust suppressants used shall be approved by the director. Petrochemical dust suppressants are prohibited. Watering the site to suppress dust is also prohibited unless it is done in a way that keeps sediment out of the storm and surface water system and receiving waters. (Ord. 6318 § 27, 2016; Ord. 5906 § 17, 2009; Ord. 4754 § 2, 1995.)