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STORMWATER SITE PLAN <br />FEBRUARY 26, 2018 <br />MUKILTEO SCHOOL DISTRICT- TRANSPORTATION <br />PAGE 5 <br />Concrete and grout: <br />• Process water and slurry resulting from concrete work will be prevented from <br />entering the waters of the state by implementing concrete handling measures (BMP <br />C151). <br />1. Concrete truck chutes, pumps, and internals shall be washed out only <br />into formed areas awaiting installation of concrete or asphalt. <br />2. Unused concrete remaining in the truck and pump shall be returned to <br />the originating batch plant for recycling. <br />3. Hand tools including, but not limited to, screeds, shovels, rakes, floats, <br />and trowels shall be washed off only into formed areas awaiting installation of <br />concrete or asphalt. <br />When no formed areas are available, washwater and leftover product shall be contained <br />in a lined container. Contained concrete shall be disposed of in a manner that does not <br />violate groundwater or surface water quality standards. <br />Sanitary wastewater: <br />• Portable sanitation facilities will be firmly secured, regularly maintained, and <br />emptied when necessary. <br />• Solid waste will be stored in secure, clearly marked containers. <br />Other: <br />Other BMPs will be administered as necessary to address any additional pollutant <br />sources on site. <br />Element #10: Control De -Watering <br />No dewatering is expected as no excavation to the water table is anticipated. Any dewatering <br />will be directed to an on -site sump or pre -manufactured settling system to allow for settlement <br />of suspended solids. <br />Element #11: Maintain BMPs <br />Notes for the maintenance of erosion control facilities will be included on the construction <br />plans. <br />Element #12: Manage the Project <br />The project will be subject to seasonal work limitations, site inspection and monitoring as <br />required by the City of Everett. Erosion control monitoring and supervision will be managed by <br />the contractor. With less than 1 acre of exposed surface, a Certified Erosion and Sedimentation <br />Control Lead is not required. <br />Element #13: Protect Low Impact Development BMPs <br />There are no LID BMPs to protect. <br />P:\Work\Projects\2012\12-185 Mukilteo SWE\DOCS\Transportation Facility Drainage 12-185.doc <br />