7800 EVERGREEN WAY HYUNDAI O&M Manual 2025-04-28

S424 BMPs for Roof / Building Drains at Manufacturing and Commercial Buildings Description of Pollutant Sources: Stormwater runoff from roofs and sides of manufacturing and commercial buildings can be sources of pollutants caused by leaching of roofing materials, paints, caulking, building vents, and other air emission sources. Research has identified vapors and entrained liquid and solid droplets/particles as potential pollutants in roof/building runoff. Metals, solvents, acidic/alkaline pH, BOD, PCBs, and organics are some of the pollutant constituents iden- tified. Ecology has performed a study on zinc in industrial stormwater. The study is presented in Sugges- ted Practices to Reduce Zinc Concentrations in Industrial Storm water Discharges(Ecology, 2008). The user should refer to this document for more details on addressing zinc in stormwater. Pollutant Control Approach: Evaluate the potential sources of stormwater pollutants and apply source control BMPs where feasible. Applicable Operational Source Control BMPs: . If leachates and/or emissions from buildings are suspected sources of stormwater pollutants, then sample and analyze the stormwater draining from the building. . Sweep the area routinely to remove any residual pollutants. . If a roof/building stormwater pollutant source is identified, implement appropriate source con- trol measures such as air pollution control equipment, selection of materials, operational changes, material recycle, process changes, etc. Applicable Structural Source Control BMPs: . Paint/coat the galvanized surfaces as described in Suggested Practices to Reduce Zinc Con- centrations in Industrial Stormwater Discharges(Ecology, 2008). Applicable Treatment BMPs: Treat runoff from roofs to the appropriate level. The facility may use Enhanced Treatment BMPs as described in III-1.2 Choosing Your Runoff Treatment BMPs. Some facilities regulated by the Indus- trial Stormwater General Permit, or local jurisdiction, may have requirements than cannot be achieved with Enhanced Treatment BMPs. In these cases, additional treatment measures may be required.A treatment method for meeting stringent requirements such as Chitosan-Enhanced Sand Filtration may be appropriate. Ps for Wood Treatment Areas Description of Pollutant Source . treatmen ' s oth anti-staining and wood pre- serving using pressure processes or b or s ood preservatives include creosote, creosote/coal tar, penta enol, copper naphthenate, arsenic alathion, or inorganic arsenical s chromated copper arsenate, acid copper chromate, chromate zin • and 2019 Stormwater Management Manual for Western Washington Volume IV- Chapter 7-Page 592