8102 EVERGREEN WAY EVERETT 4 CORNERS 2025-08-06

Four Corners Short Plat Sanitary wastewater: Stormwater Site Plan • Portable sanitation facilities will be firmly secured, regularly maintained, and emptied when necessary. Solid Waste: • Solid waste will be stored in secure, clearly marked containers. Other: • Other BMPs will be administered as necessary to address any additional pollutant sources on site. As per the Federal regulations of the Clean Water Act (CWA) and according to Final Rule 40 CFR Part 112, as stated in the National Register, a Spill Prevention, Control, and Countermeasure (SPCC) Plan is required for construction activities. The Contractor shall prepare an SPCC Plan according to the Washington State Department of Transportation (WSDOT) Requirements (see the WSDOT Standard Specifications for Road, Bridge, and Municipal Construction 2004) to address an approach to prevent, respond to, and report spills or releases to the environment that could result from construction activities. This Plan must: • Be well thought out in accordance with good engineering; • Achieve three objectives - prevent spills, contain a spill that occurs, and clean up the spill; • Identify the name, location, owner, and type of facility; • Include the date of initial operation and oil spill history; • Name the designated person responsible; • Show evidence of approval and certification by the person in authority; and • Contain a facility analysis. 10. Control Dewatering Any potential dewatering water from open cut excavation, tunneling, foundation work, trench, or underground vaults shall be discharged into a controlled conveyance system prior to discharge to a sediment trap or sediment pond. Channels will be stabilized, per Element #8. Clean, non -turbid dewatering water will not be routed through stormwater sediment ponds, and will be discharged directly to downstream systems in a manner that does not cause erosion, flooding, or a violation of State water quality standards in receiving waters. Highly turbid dewatering water from soils known or suspected to be contaminated, or from use of construction equipment, will require additional monitoring and treatment as required for the specific pollutants based on the receiving waters into which the discharge is occurring. Such monitoring is the responsibility of the contractor. The dewatering of soils known to be free of contamination will trigger BMPs to trap sediment and reduce turbidity. At a minimum, geotextile fabric socks/bags/cells will be used to filter this material. 11. Maintain BMP's All temporary and permanent erosion and sediment control BMPs shall be maintained and repaired as needed to assure continued performance of their intended function. Maintenance and repair shall be conducted in accordance with each particular BMP's specifications. Visual monitoring of the BMPs _ will be conducted at least once every calendar week and within 24 hours of any rainfall event that causes a discharge from the site. If the site becomes inactive, and is temporarily stabilized, the inspection frequency will be reduced to once every month. CPH Project No. 0024-18-042 October 23, 2020 CPIH CONSULTANTS Page 9