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existing large grassy field complex, approximately 7.5 acres in size, to prevent <br /> concentration of flows and to allow infiltration of stormwater. Because flows are <br /> already dispersed as it leaves the paved surface, the adjacent vegetation will provide <br /> effective attenuation and treatment of runoff. A 2-foot wide crushed rock transition <br /> zone will be provided to prevent channeling between the edge of the pavement and the <br /> grassy field. <br /> 3.2.7 M.R.#8—Wetland Protection <br /> There are no known wetlands within or adjacent to the project site. <br /> 3.2.8 M.R.#9—Operation and Maintenance <br /> A copy of the Maintenance Plan is provided in Appendix B. Everett Public Schools <br /> will be responsible for the operation and maintenance of the proposed stormwater <br /> facilities and BMPs. A copy of the Maintenance Plan shall be either retained onsite or <br /> within reasonable access to the site. <br /> 4.0 ESC ANALYSIS AND DESIGN <br /> The proposed development will comply with guidelines outlined in the City of Everett's 2010 <br /> Stormwater Management Manual. The plans include erosion/sedimentation control features <br /> designed to prevent sediment-laden runoff from leaving the site and/or adversely affecting critical <br /> water resources downstream during construction. <br /> 4.1 ESC Plan Analysis and Design <br /> Temporary erosion control facilities will be installed prior to any construction activities. The <br /> construction period is scheduled for the summer months, which should significantly reduce the <br /> likelihood of discharging turbid stormwater downstream. Erosion control best management <br /> practices will include silt fencing, catch basin inlet protection, straw mulch, and plastic covering. <br /> Existing paved driveways and other hard surfaced areas will be utilized for construction access to <br /> minimize erosion/sedimentation. The most effective erosion control measure is to maintain <br /> adequate groundcover. Maintaining cover measures over disturbed soils greatly reduces turbid <br /> runoff and sediment transport. These best management practices are incorporated into the erosion <br /> control design. <br /> The erosion potential of the site is influenced by four major factors: soil characteristics, <br /> vegetative cover, topography, and climate. Erosion/sedimentation control is achieved by a <br /> combination of structural measures, cover measures,and construction practices that are tailored to <br /> fit the specific site. An erosion and sedimentation control plan has been prepared for the <br /> Contractor's use during construction and is included with the engineering plan submittal. <br /> The following measures will be used to control sedimentation/erosion during construction: <br /> • Clearing Limits: All areas to remain undisturbed during construction will be delineated <br /> prior to any site clearing or grading. <br /> • Cover Measures: Disturbed areas shall be covered as required. <br /> Technical Information Report <br /> Synthetic Turf Field Project 4 Integrityworks Consulting Engineers,LLC <br /> Project No.212107 <br />