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13.2 Mitigation Measures <br /> A. Erosion Control <br /> In accordance with the Puget Sound Water Quality Action Plan, construction of development <br /> projects should always include erosion control measures. Downtown development projects <br /> must meet the following Everett Public Works mitigation measures. These requirements are <br /> designed to minimize land disturbance and confine construction activities to the smallest <br /> practical area: <br /> • Erosion and sedimentation control plans must be reviewed and approved by the Public <br /> Works Department. Specific erosion control measures listed in the Stormwater Manual <br /> must be provided. <br /> • Erosion control measures must be installed and operational prior to initiation of clearing, <br /> grubbing, or grading operation. <br /> • Soil piles should be covered with plastic sheeting or other impervious coverings staked <br /> to the ground or anchored with rocks or sandbags. <br /> • Berms, earthen or otherwise should be constructed at the perimeter of excavated areas <br /> to prevent adjacent site runoff from entering the excavation. <br /> • City streets must be kept clear of dirt and debris at all times during construction. Dust <br /> suppression and street cleaning must occur as directed by the Public Works inspector. <br /> • Ensure that grading/filling on-site will not adversely affect adjoining sites during the <br /> detailed site specific plan review. <br /> B. Other Site Layout Mitigation <br /> To complement erosion control practices, Downtown development projects should minimize <br /> impervious areas to the maximum extent possible. Measures include: <br /> • Preserve areas with natural vegetation <br /> • Cluster buildings <br /> • Maintain and utilize natural drainage patterns <br /> • Integrate natural landscape mitigation at the site level. Methods such as Low Impact <br /> Development (LID) can mimic a site's predevelopment hydrology by using techniques <br /> that infiltrate, store and detain runoff close to its source <br /> C. Combined Sewer Overflows <br /> Operation of the City's combined sanitary/storm sewer system is in compliance with the City's <br /> National Pollutant Discharge Elimination System Waste Discharge Permit No. WA-002449-0. As <br /> part of the Waste Discharge Permit requirements, the City developed a CSO Reduction Plan <br /> which has been approved by the Department of Ecology, and which is currently being <br /> implemented throughout the City. <br /> 32 <br />