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Maintaining an Updated Construction SWPPP: <br /> The construction SWPPP shall be retained on-site or within reasonable access to the site. <br /> The SWPPP shall be modified whenever there is a change in the design, construction, <br /> operation, or maintenance at the construction site that has, or could have, a significant <br /> effect on the discharge of pollutants to waters of the state. <br /> The SWPPP shall be modified if, during inspections or investigations conducted by the <br /> owner/operator, or the applicable local or state regulatory authority, it is determined that the <br /> SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater <br /> discharges from the site. The SWPPP shall be modified as necessary to include <br /> additional or modified BMPs designed to correct problems identified. Revisions to the <br /> SWPPP shall be completed within seven days following inspection. <br /> 13: protect all permanent BMPs from sedimentation through installation and <br /> maintenance of erosion and sediment control BMPs on portions of the site that drain into <br /> these permanent BMPs. <br /> MINIMUM REQUIREMENT NO. 3 - SOURCE CONTROL OF <br /> POLLUTION <br /> The intent of source control is to prevent stormwater from encountering pollutants. Source <br /> control BMPs can be operational or structural in nature. This section contains practices and <br /> procedures to reduce the release of pollutants. Provided is a description of all known, <br /> available and reasonable source control BMPs that will be used on your site to prevent <br /> stormwater from encountering pollutants. Source control BMPs are selected, designed and <br /> maintained in accordance with the 2019 SWMMWW Volume IV. <br /> The following source control BMPs are required for this project: <br /> BMP S411: for landscaping and lawn/vegetation management <br /> In addition, these source control BMPs are required. Correcting illicit connections to <br /> storm drains (S410), formation of a pollution prevention team (S453), preventative <br /> maintenance/good housekeeping (S454), spill prevention and cleanup (S455), employee <br /> training (S456), inspections (S457), and recordkeeping (S458). <br /> MINIMUM REQUIREMENT NO. 4 - PRESERVATION OF NATURAL <br /> DRAINAGE SYSTEMS AND OUTFALLS <br /> This project consists of one on-site basin that is within North Creek Basin. Stormwater on <br /> the site currently sheet flow southeast towards through the neighboring single-family <br /> property to an existing storm drainage system at Holly Drive. <br /> The project has been designed to collect all runoff from the new impervious and pervious <br /> surfaces proposed on this site and releasing flows to the existing conveyance system the <br /> same as in existing conditions. This will be done by constructing the driveways to drain <br /> toward one side, collecting and dispersing the flow toward vegetated area dispersion <br /> Drainage Report—9227 4th Ave W Everett,WA 98204 <br /> Nov. 10,2022 Page 13 <br />