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A. The following types of discharges shall not be considered illicit discharges for the purpose of this chapter if they meet the stated conditions, or unless the Director and/or his or her designee determines that the type of discharge, whether singly or in combination with others, is causing or is likely to cause pollution of surface water or groundwater:

1. Potable water, including water from water line flushing, hyperchlorinated water line flushing, fire hydrant system flushing, and pipeline hydrostatic test water. Planned discharges shall be de-chlorinated to a concentration of 0.1 mg/L (ppm) or less, pH adjusted, if necessary and in volumes and velocities controlled to prevent re-suspension of sediments in the storm water system. Lawn watering and other irrigation runoff are permitted but shall be minimized.

2. De-chlorinated Swimming Pool, Spa and Hot Tub Discharges. These discharges are allowed only if no other option, such as discharging to a sanitary sewer, is available. These discharges shall be de-chlorinated to a total residual chlorine concentration of 0.1 mg/L (ppm) or less, pH adjusted, and reoxygenized if necessary and in volumes and velocities controlled to prevent re-suspension of sediments in the storm water system. Discharges shall be thermally controlled to prevent an increase in temperature of the receiving water. Swimming pool cleaning wastewater and filter backwash shall not be discharged to the storm water system.

3. Street and sidewalk wash water, water used to control dust, and routine external building wash down that does not use detergents or chemicals of any kind. Wash water is required to be kept at a minimum. Pressure washing that results in paint or other building materials in wash water is prohibited from entering the storm water drainage system. Street flushing at construction sites is prohibited in Redmond.

4. Fire Sprinkler System Flushing. These discharges are allowed only if no other option, such as discharging to a sanitary sewer, is available. Sprinkler system flushing water with any chemicals added is prohibited in the storm water drainage system. Sprinkler system flushing water discharges shall be de-chlorinated to a concentration of 0.1 mg/L (ppm) or less, pH adjusted, if necessary and discharged in volumes and velocities controlled to prevent re-suspension of sediments in the storm water system.

5. Non-storm water discharges covered by an individual or general NPDES permit; provided, that the discharge is in full compliance with all requirements of the permit, waiver, or order and other applicable laws and regulations.

6. Other Non-Storm Water Discharges. The discharges shall be in compliance with requirements of a storm water pollution prevention plan (SWPPP) reviewed and approved by the City of Redmond, which addresses control of such discharges by applying all known and reasonable technologies (AKART) to prevent contaminants from entering surface water and groundwater. (Ord. 3031 § 2, 2021; Ord. 2859 § 2 (part), 2016: Ord. 2473 § 2 (part), 2009).