6201 ASSOCIATED BLVD BASE FILE 2018-03-29

f 4 =WCIS 5.0 SUMMARY OF MINIMUM DEVELOPMENT REQUIREMENTS • 5.1 Minimum Requirement#1: Preparation of Stormwater Site Plans This is the Stormwater Site Plan. It is prepared in accordance with Chapter 3 of Volume I of the 2005 WDOE Manual. 5.2 Minimum Requirement#2: Construction Stormwater Pollution Prevention(SWPP) A Stormwater Pollution Prevention Plan was prepared and implemented for the site improvements. This Plan provides erosion and sediment control information, locations where Best Management Practices (BMPs) have been implemented, and requirements that the contractor must follow throughout construction. These BMPs include,but are not limited to the use of C105: Stabilized Construction Entrance, C233: Silt Fence, C220 Storm Drain Inlet Protection, and C123: Plastic Covering for any stockpiles. The existing detention pond will be modified with a standpipe riser and will be used as a sediment pond during construction operations. The SWPP Plan, includes Temporary Erosion and Sediment Control (TESC) measures and is part of the contract documents for construction of the project. Additional erosion control measures may be applied on an as needed basis as directed by the Certified Erosion Control Specialist (CESL), City of Everett personnel, or Contractor. At the completion of the project exposed soils will be seeded. The establishment of vegetation on all exposed surfaces provides permanent erosion control. 5.3 Minimum Requirement#3: Source Control of Pollution During the construction phase of the project, source control measures will be implemented. These measures are discussed in Minimum Requirement #2. Other than the presence of new pollution generating impervious surfaces (which will receive treatment as outlined in this Plan), no improvements are proposed which will require additional source control BMPs. 5.4 Minimum Requirement#4: Preservation of Natural Drainage Systems and Outfalls No changes to the existing natural drainage systems or outfalls are proposed. Discharge of runoff will be to existing location to maintain hydrology of downstream systems. 5.5 Minimum Requirement#5: On-Site Stormwater Management The WDOE Manual requires the use of onsite Stormwater Management BMPs to infiltrate, disperse, and retain stormwater runoff onsite to the maximum extent feasible without causing flooding or erosion impacts. Due to a large quantity of fill with low permeability stormwater infiltration is not proposed. An onsite water quality regime will be used to mitigate potential stormwater runoff impacts. DAVID EVANS AND ASSOCIATES,INC. UNDERWOOD GARTLAND EVERETT FEBRUARY 3,2015 STORMWATER SITE PLAN PAGE 5