304 SE EVERETT MALL WAY PANERA BREAD 2025-07-25

Panera Bread Stormwater Management Report Everett,WA A1.1: Cleaning or Washing of Tools, Engines, and Manufacturing Equipment Description of Pollutant Sources:This activity applies to businesses and public agencies that clean manufacturing equipment such as saws, grinders, screens, and other processing devices outside of buildings, and to businesses engaged in pressure washing of engines, equipment, and portable objects. Pollutants sources include toxic hydrocarbons, organic compounds, oils and greases, nutrients, heavy metals, pH, suspended solids, biochemical oxygen demand (BOD), and chemical oxygen demand (COD). Pollutant Control Approach:The preferred approach is to cover and/or contain the cleaning activity or conduct the activity inside a building, to separate the uncontaminated stormwater from the pollutant sources. Washwater must be conveyed to a sanitary sewer after approval by the City, temporarily stored before proper disposal, or recycled—with no discharge to the ground, a storm drain, or surface water. Washwater may be discharged to the ground after proper treatment in accordance with Ecology guidance WQ-R-95-56, "Vehicle and Equipment Washwater Discharges,"June 1995. The quality of any discharge to the ground after proper treatment must comply with Ecology's Ground Water Quality Standards, Chapter 173-200 WAC. Contact the Ecology Northwest Regional Office for an NPDES permit application for discharge of washwater to surface water or to a storm drain after onsite treatment. Required BMPs The following BMPs, or equivalent measures, are required of all businesses and public agencies engaged in cleaning or washing of vehicles, tools, engines, equipment, and portable objects: 1. Employees shall be educated to control washing operations to prevent stormwater contamination. 2. All washwater must discharge to a holding tank, process treatment system, or sanitary sewer —never to the stormwater drainage system. See BMP S.3 in Chapter 4 for detailed information on how this must be accomplished. 3. Pressure washing must be done in a designated area (such as a wash pad) provided with a sump drain and stormwater run-on prevention. See BMPs S.6 and 5.7 in Chapter 4 for information on sumps (or holding tanks) and run-on prevention. Contact the City's Industrial Pretreatment Program (425) 257-8874 for washing operation policy. 4. If soaps or detergents are used, use the least toxic cleaner capable of doing the job. Use non- phosphate detergent, if possible, to reduce loading at the City's wastewater treatment plant. 5. Limit the amount of water used in washing activities to reduce the potential of runoff carrying pollutants beyond the designated wash pad or capture system. 6. Recycle washwater for subsequent washings, if possible. Core States Group Page 28