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Riverview Apartments Stormwater Pollution Prevention Plan <br />• <br />• <br />2.1.10 Element 10: Control Dewatering <br />Any potential dewatering water from open cut excavation, tunneling, foundation work, trench, or <br />underground vaults shall be discharged into a controlled conveyance system prior to discharge <br />to a sediment trap or sediment pond. Channels will be stabilized, per Element #8. Clean, non - <br />turbid dewatering water will not be routed through stormwater sediment ponds, and will be <br />discharged directly to downstream systems in a manner that does not cause erosion, flooding, <br />or a violation of State water quality standards in receiving waters. Highly turbid dewatering water <br />from soils known or suspected to be contaminated, or from use of construction equipment, will <br />require additional monitoring and treatment as required for the specific pollutants based on the <br />receiving waters into which the discharge is occurring. Such monitoring is the responsibility of <br />the contractor. <br />Concrete shall be managed in accordance with City and WSDOT standards. No washing out of <br />concrete trucks shall be permitted on the project site. <br />Table 4 — Dewatering BMPs <br />❑ <br />I Infiltration <br />❑ <br />Transport off -site in a vehicle (vacuum truck for legal disposal) <br />❑ <br />Ecology -approved on -site chemical treatment or other suitable treatment technologies <br />❑ <br />Sanitary or combined sewer discharge with local sewer district approval (last resort) <br />❑ <br />Use of sedimentation bag with discharge to ditch or swale (small volumes of localized <br />dewatering) <br />List and describe BMPs: BMP C151: Concrete Handling <br />Installation Schedules: <br />Inspection and Maintenance plan: <br />Responsible Staff: <br />CPH Project No. 0024-17-037 August 28, 2018 <br />CP I H CONSULTANTS Page 18 <br />