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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 /> MUKILTEO SCHOOL DISTRICT <br /> TEACHING AND LEARNING CENTER <br /> PRELIMINARY CONSTRUCTION SWPPP NARRATIVE <br /> JULY 22,2014;REVISED AUGUST 25,2014 <br /> The following Preliminary Construction Storm Water Pollution Prevention Plan(C-SWPPP) <br /> Narrative for the Mukilteo School District Teaching and Learning Center project supplements the <br /> Temporary Erosion and Sediment Control drawings. This narrative and the drawings address the <br /> requirements of Volume II, Chapter 2 of the 2010 City of Everett Stormwater Management <br /> Manual and Section 3.3 of Volume II of the 2012 Washington State Department of Ecology <br /> (DOE) Stormwater Management Manual for Western Washington. The project will also require a <br /> NPDES permit application(Notice of Intent)for a Construction Stormwater General Permit <br /> through the DOE,which has been prepared separately. <br /> . CONSTRUCTION STORMWATER POLLUTION PREVENTION ELEMENTS <br /> 1) Mark Clearing Limits: Clearing Limits are indicated on the plans by the limit of <br /> work line. Clearing Limits and project limits will be delineated in the field by the <br /> construction fencing,as shown on the TESC plan. The actual limits of clearing will <br /> most likely be smaller than the limit of work area,but this identifies the maximum <br /> extent of the clearing limits. Tree protection fencing will be provided as applicable <br /> per landscape plans. <br /> 2) Establish Construction Access: Construction access is shown on the TESC plans, <br /> via an existing driveway. A stabilized construction entrance will be constructed on <br /> top of the existing gravel pathway per TESC plan. <br /> 3) Control Flow Rates: Flow rates will be minimized by dispersing flows onto existing <br /> vegetated slopes:Filter fabric fencing and inlet protection will also be used as <br /> needed. <br /> 4) Install Sediment Controls: DOE-approved BMPs for sediment setting include,but <br /> are not limited to C233 silt fence and C220 catch basin inserts. Sediment control <br /> during construction will be achieved by keeping exposed soils covered, in accordance <br /> with the notes and details in the plans. In the event that unexpected conditions arise <br /> during construction,the Owner is expected to contract with a third party erosion <br /> control monitor to help manage the site and prevent any discharges of turbid water to <br /> the downstream system. The contractor's Certified Erosion and Sediment Control <br /> Lead(CESCL)will be responsible for the required sampling of stormwater <br /> discharges from the site as required by the DOE stormwater permit. Turbidity and pH <br /> monitoring of stormwater during construction by the third party erosion control <br /> monitor is required per the project's Turbidity Monitoring Plan.Monitoring test <br /> results will be provided to the Contractor, and are to be kept on site for reference and <br /> review if requested by City representatives or other agencies. Monthly summary <br /> reports are required to be prepared and signed by the NPDES permit holder,and <br /> submitted to DOE. The CESCL is also required to perform weekly inspection(at a <br /> minimum)of TESC BMPs throughout the site. A soil stockpile with straw bale <br /> barrier is shown on the erosion control plans. <br /> Page <br />