220 OLYMPIC BLVD VA OUTPATIENT CLINIC 2023-02-09

I 1 IV-4 Soil Erosion, Sediment Control, and Landscaping Source Control BMPs S407 BMPs for Dust Control at Disturbed Land Areas and Unpaved Roadways and Parking Lots I Note:Contact the local air quality authority for appropriate and required BMPs for dust control to implement at your project site. Use the following website to determine the air quality authority for the project site: https://ecology.wa.gov/About-us/Our-role-in-the-community/Partnerships-committees/Clean-air- agenciesI Description of Pollutant Sources: Dust can cause air and water pollution problems particularly at demolition sites and in arid areas where reduced rainfall exposes soil particles to transport by air. I Pollutant Control Approach: Minimize dust generation and apply environmentally friendly and government approved dust suppressant chemicals, if necessary. 111 Applicable Operational BMPs: • Sprinkle or wet down soil or dust with water as long as it does not result in a wastewater disI - charge. • Use only dust suppressant chemicals that are approved by the local jurisdiction and/or state 111 government approved dust suppressant chemicals such as those listed in Alternatives to Haz- ardous Materials: Techniques for Dust Prevention and Suppression(Ecology, 2016b). • Avoid excessive and repeated applications of dust suppressant chemicals.Time the applicI - ation of dust suppressants to avoid or minimize their wash-off by rainfall or human activity such as irrigation. • Apply stormwater containment to prevent the conveyance of sediment into storm drains or receiving waters. • Protect inlets/catch basins during application of dust suppressants. • Ecology prohibits the use of motor oil for dust control.Take care when using lignin derivatives and other high BOD chemicals in areas susceptible to contaminating surface water or groundI water. • Consult with Ecology and the local permitting authority on discharge permit requirements if the dust suppression process results in a wastewater discharge to the ground, ground water, storm drain,or surface water. • Street gutters, sidewalks,driveways,and other paved surfaces in the immediate area of the activity must be swept regularly to collect and properly dispose of dust,dirt, loose debris,and garbage. I 2019 Stormwater Management Manual for Western Washington Volume IV-Chapter 4-Page 521