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Mukilteo School District Teaching and Learning Center <br /> (� Construction SWPPP Narrative <br /> July 22, 2014; Revised August 25,2014 <br /> engineering p c <br /> 5) Stabilize Soils: DOE-approved BMPs for soil stabilization will be utilized during <br /> construction.BMPs including,but not limited to: C101,Preserving Natural <br /> Vegetation;C'121,Mulching; C123,Plastic Covering; C130, Surface Roughening; <br /> and C140,Dust Control will be used to stabilize on-site soils during construction. <br /> 6) Protect Slopes: DOE-approved BMPs for slope protection will be utilized during <br /> construction. BMPs including,but not limited to: C121,Mulching; C123,Plastic <br /> Covering; C130, Surface Roughening; C200,C233, Silt Fence are to be utilized to <br /> protect slopes during construction. <br /> 7) Protect Drain Inlets: Drainage structures located in areas where no work occurs will <br /> remain intact and will be protected. Catch basins will be protected with catch basin <br /> inserts(BMP C220)to prevent discharge of turbid water downstream. Proposed <br /> inlets will also be protected with catch basin inserts,and where feasible,their outlets <br /> will be temporarily plugged until the site is stabilized. <br /> 8) Stabilize Channels and Outlets: DOE-approved BMPs for channel stabilization will <br /> be utilized during construction, including,but not limited to: C200,Interceptor Dike <br /> and Swale and C207,and Check Dams. <br /> 9)Control Pollutants: All construction debris will be removed from the site. Contractor <br /> will be responsible for managing their construction equipment per DOE-approved <br /> BMPs. Stabilized construction entrances are assumed sufficient for the construction <br /> period; if additional measures are required,contractor is to coordinate with the <br /> Owner's Representative and the City of Everett inspector. Concrete truck wash water <br /> shall be collected and discharged to the public sanitary sewer(SS)system. Contractor <br /> will be responsible for applying for SS release and shall contact appropriate City of <br /> Everett Industrial Waste personnel for authorization. Cover,containment,and <br /> protection from vandalism shall be provided for all chemicals, liquid products, <br /> petroleum products,and other materials that have the potential to pose a threat to <br /> human health or the environment. Onsite fueling tanks shall include secondary <br /> containment. <br /> 10) Control De-Watering: Groundwater seepage is not expected to be encountered in <br /> excavations for this project. If encountered,perched groundwater shall be collected <br /> and pumped if necessary to route the water to the sediment settling facilities. <br /> 11) Maintain BMPs: DOE-approved standards regarding BMP maintenance will be <br /> required in accordance with the Erosion and Sedimentation Control Plan and Notes. <br /> 12) Manage the Project: All phases of construction will be managed by the contractor. <br /> The site must be stabilized and no soils will be allowed to remain unstabilized for <br /> more than two days between October 1st and April 30th. Contractor will provide • <br /> maintenance and monitoring of TESC BMPs. Work of all contractors will be <br /> coordinated to minimize the duration of disturbance on the site. The C-SWPPP shall <br /> be modified if, is determined that the C-SWPPP is ineffective in eliminating or <br /> significantly minimizing pollutants in stormwater discharges from the site. <br /> Page 2 <br />