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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL Suggested BMPs 1. Avoid the activity when rain is occurring or expected. 2. If possible,portable asphalt mixing equipment should be covered by an awning,a lean-to,or another simple structure to avoid contact with rain. See BMP S.4 in Chapter 4 for further details on cover structures. 3. Recycle broken concrete and asphalt. Look under Recycling Services in the Yellow Pages of the phone book to find the nearest recycler. A3.3 Manufacturing and Post-processing of Metal Products Description of Pollutant Sources: This activity applies to businesses such as mills,foundries,and fabricators that manufacture or post-process metal products. A variety of activities such as machining, grinding,soldering,cutting,welding,quenching,cooling,and rinsing may take place. These businesses may be required to obtain a NPDES permit from Ecology. See Appendix A for a discussion of NPDES requirements. Note: Painting,finishing and coating of metal products is covered under A3.10 Painting, Finishing,and Coating of Vehicles,Boats,Buildings, and Equipment. Pollutants of concern include toxic organic compounds, heavy metals,oils and greases,pH,suspended solids,and chemical oxygen demand(COD). Pollutant Control Approach: Cover and contain operations and apply good housekeeping and preventive maintenance practices to prevent the contamination of stormwater. Required BMPs The following BMPs or equivalent measures are required of all businesses engaged in metals manufacturing or post-processing: 1. Eliminate illicit connections to the stormwater drainage system. See BMP S.1 in Chapter 4 for detailed information on identifying and eliminating illicit connections. 2. Process wastewater(including contact cooling water,filter backwash,cooling tower blow down, etc.)from this activity,and stormwater runoff from activity areas,must discharge to a sanitary sewer,holding tank,or process treatment system that would need an Ecology NPDES permit for discharge to surface water or storm drain. Contact the City's Industrial Pretreatment Program at (425)257-8874 to obtain permits for discharge to the sewer. See BMP S.3 in Chapter 4 for detailed requirements. 3. Employees must be educated in proper handling to control their work with metal products to minimize pollution. 4. The activity area must be swept at the end of each workday to collect and dispose of metal fragments and product residues properly. See BMP S.2 in Chapter 4 for disposal alternatives. 5. Limit the amount of water used in quenching and rinsing. Recycle used water where possible. 6. Cover the activity area to prevent rain from contacting the process and reduce the amount of runoff that has to be detained or treated. See Activity A3.9. 7. Refer to the BMPs under A2 Transfer of Liquid Materials and A4 Storage and Stockpiling Activities,and utilize those BMPs which are applicable for materials storage and maintenance activities that occur at the site. Volume IV—Source Control 3-18