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(8) MINIMUM REQUIREMENT #5: STREAMBANK EROSION CONTROL <br /> This requirement applies when five thousand (5,000) square feet or more of impervious <br /> surface is added or created by a project and stormwater runoff is discharged directly or <br /> indirectly to a stream: <br /> Streambank erosion shall be controlled by limiting the peak rate of runoff from individual <br /> development sites to fifty (50)percent of the existing condition 2-year, 24-hour design <br /> storm for the developed runoff rate from the 2 years, 24-hour storm, while maintaining <br /> the existing condition peak runoff rate for the 10-year, 24-hour and 100-year, 24-hour <br /> design storms. As the first priority, streambank erosion control BMPs shall utilize <br /> infiltration to the fullest extent practicable, only if site conditions are appropriate and <br /> ground water quality is protected. Streambank erosion control BMPs shall be selected, <br /> designed, and maintained according to the City of Everett's Stormwater Management <br /> Manual. <br /> Streambank erosion control BMPs shall not be built within Environmentally Sensitive <br /> Areas or their required buffers (except as allowed in the City's Zoning Code), except for <br /> necessary conveyance systems as approved by the City. <br /> An adopted and implemented basin plan (Minimum Requirement#9) may be used to <br /> develop streambank erosion control requirements that are tailored to a specific basin. <br /> (9) MINIMUM REQUIREMENT#6: WETLANDS <br /> The requirements below apply to sites immediately adjacent to a wetland and must be <br /> met in addition to meeting other requirements. "Immediately adjacent" for purposes of <br /> this requirement shall mean those parcels that are wholly or partially contained within a <br /> wetland delineated in accordance with Everett's Zoning Code including the wetland <br /> outlet and those parcels that abut a wetland buffer. In addition, these requirements apply <br /> if a wetland is proposed for stormwater detention for upstream development(assuming <br /> all other local, state and federal approvals are obtained). <br /> a. Discharge to Wetlands shall maintain the hydroperiod and flows of existing site <br /> conditions to the extent necessary to protect the characteristic uses of the wetland. <br /> Prior to discharging for storage to a wetland, alternative discharge locations shall <br /> be evaluated, and natural water storage to a wetland alternative discharge <br /> 19 <br />