1502 WALL ST IMAGINE CHILDRENS MUSEUM 2022-08-25

BMP C140: Dust Control Purpose Dust control prevents wind transport of dust from disturbed soil surfaces onto roadways,drainage ways,and surface waters. Conditions of Use Use dust control in areas(including roadways)subject to surface and air movement of dust where on-site or off-site impacts to roadways,drainage ways',or surface waters are likely. Design and Installation Specifications . Vegetate or mulch areas that will not receive vehicle traffic. In areas where planting, mulching, or paving is impractical,apply gravel or landscaping rock. . Limit dust generation by clearing only those areas where immediate activity will take place, leaving the remaining area(s)in the original condition. Maintain the original ground cover as long as practical. . Construct natural or artificial windbreaks or windscreens.These may be designed as enclos- ures for small dust sources. . Sprinkle the site with water until the surface is wet. Repeat as needed.To prevent carryout of mud onto the street, refer to BMP C105:Stabilized Construction Access and BMP C106: Wheel Wash. . Irrigation water can be used for dust control. Irrigation systems should be installed as a first step on sites where dust control is a concern. . Spray exposed soil areas with a dust palliative,following the manufacturer's instructions and cautions regarding handling and application. Used oil is prohibited from use as a dust sup- pressant. Local governments may approve other dust palliatives such as calcium chloride or PAM. . PAM(BMP C 126: Polyacrylamide(PAM)for Soil Erosion Protection)added to water at a rate of 0.5 pounds per 1,000 gallons of water per acre and applied from a water truck is more effect- ive than water alone.This is due to increased infiltration of water into the soil and reduced evaporation. In addition, small soil particles are bonded together and are not as easily trans- ported by wind.Adding PAM may reduce the quantity of water needed for dust control. Note that the application rate specified here applies to this BMP, and is not the same application rate that is specified in BMP C 126: Polyacrylamide(PAM)for Soil Erosion Protection, but the downstream protections still apply. Refer to BMP C 126: Polyacrylamide(PAM)for Soil Erosion Protection for conditions of use. PAM shall not be directly applied to water or allowed to enter a water body. . Contact your local Air Pollution Control Authority for guidance and training on other dust con- trol measures.Compliance with the local Air Pollution Control Authority constitutes 2019 Stormwater Management Manual for Western Washington Volume 11-Chapter 3-Page 313