1004 BROADWAY EVCC STUDENT HOUSING - PUBLIC WORKS 2017-01-13

STORMWATER SITE PLAN EVERETT COMMUNITY COLLEGE HOUSING - BROADWAY SEPTEMBER 11, 2015 PAGE 6 Demolition: • Dust released from demolished sidewalks shall be controlled using dust control measures (BMP C140). • Storm drain inlets vulnerable to stormwater discharge carrying dust, soil, or debris will be protected using storm drain inlet protection (BMP C220 as indicated on the plan). • Process water and slurry resulting from sawcutting and surfacing operations will be prevented from entering the waters of the state by implementing sawcutting and surfacing pollution prevention measures (BMP C152). 1. Slurry and cutting shall be vacuumed during cutting and surfacing operations. 2. Slurry and cuttings shall not drain to any natural or constructed drainage conveyance. 3. Collected slurry and cuttings shall be disposed of in a manner that does not violate groundwater or surface water quality standards. Concrete and grout: • Process water and slurry resulting from concrete work will be prevented from entering the waters of the state by implementing concrete handling measures (BMP C151). 1. Concrete truck chutes, pumps, and internals shall be washed out only into formed areas awaiting installation of concrete or asphalt. 2. Unused concrete remaining in the truck and pump shall be returned to the originating batch plant for recycling. 3. Hand tools including, but not limited to, screeds, shovels, rakes, floats, and trowels shall be washed off only into formed areas awaiting installation of concrete or asphalt. When no formed areas are available, washwater and leftover product shall be contained in a lined container. Contained concrete shall be disposed of in a manner that does not violate groundwater or surface water quality standards. Sanitary wastewater: • Portable sanitation facilities will be firmly secured, regularly maintained, and emptied when necessary. • Solid waste will be stored in secure, clearly marked containers. Other: Other BMPs will be administered as necessary to address any additional pollutant sources on site. Element #10: Control De-Watering Borings were extended to 8 feet with no indication of groundwater. No dewatering is expected as no excavation to the water table is anticipated. Any dewatering will be directed to an on-site sump or pre-manufactured settling system to allow for settlement of suspended solids. P: \1'i�tk Pri�jcil�'?UI� 1i-17U I<t�i- l3m;ul��.n`('L I)O('S Kui Rnr,i�l��':i1' Ih;iin.if�c li-1'ID.d�u