Source Control Requirements

Secondary Containment

Facilities within the City of Redmond's Wellhead Protection Zones 1 and 2 are REQUIRED to have hazardous materials and deleterious substances in secondary containment. Secondary containment is a container to catch spills or leaks from the original container. Secondary containment or equivalent best management practices will be required for combined quantities of hazardous materials or deleterious substances greater than or equal to 20 gallons liquid or 200 pounds solid.

Any containers, drums, or above ground storage tanks containing hazardous materials or deleterious substances must be put into secondary containment to catch possible spills. For example, the secondary container can be a portable plastic tub, metal drum, pallet with a containerized base, or bermed concrete pad with a coating compatible with the stored products (bare concrete is NOT sufficient). As you set up your secondary containment system, follow these guidelines: 
  • Review and revise existing material handling and storage processes to minimize any leaks of products, wastes, liquids or solids out of the system to the soil, groundwater, or surface water at any time. 
  • Use secondary containers capable of collecting releases and accumulated products, wastes, liquids or solids until the collected material is removed. 
  • Use separate secondary containers for hazardous materials that are incompatible. 
  • Secondary containment should have the capacity to hold 110 percent of the volume of the largest primary container. 
  • If the facility has fire sprinklers the secondary containment capacity needs to hold 110 percent of the volume of the largest primary container and 20 minutes of sprinkler water. 
  • If located outdoors, cover the secondary containment area to keep water out. 
  • Make sure secondary containers are constructed with materials that are compatible with the products or wastes held in the primary container. 
  • Do not allow accumulation of other fluids, such as rain water, inside the secondary containment; drain immediately. 
  • Conduct analytical testing of water or other fluids, if required, to determine proper disposal.
Contact:   Ken Waldo - 425-556-2714

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Best Management Practices

You can help protect Redmond’s drinking water resource by implementing operational and structural source control best management practices at your facility. Operational BMPs are managerial approaches to reducing environmental impacts. Structural BMPs are physical, structural, or mechanical devices or facilities that are intended to prevent pollutants from entering the environment.

For a complete list of basic operational and business or activity specific source control BMPs review Volume IV or the 2005 Ecology Stormwater Management Manual for Western Washington.

Contact:  Ken Waldo - 425-556-2714