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Contaminated surfaces shall be cleaned immediately following any discharge or spill <br />incident. <br />Debris and waste materials: <br />• Debris and waste materials will be stockpiled onsite until disposed of offsite at an <br />appropriate waste disposal facility. Stockpiles will be covered with plastic sheeting and <br />surrounded by silt fencing to prevent contamination of the surface water. <br />3.1.10 Element #10 — Control Dewatering <br />Groundwater is not expected to be encountered during construction, as construction involves <br />only shallow excavations. All discharges to the City of Everett Sewer System(s) require prior <br />approval, through a Special Authorization Discharge (SAD) Permit. Any discharge foundation, <br />vault, and trench dewatering water that has similar characteristics to site storm water runoff <br />into a controlled conveyance system prior to discharge to a sediment pond or sediment <br />tank/vault. Clean, non-turbid dewatering water, such as well-point groundwater, can be <br />discharged to systems tributary to state surface waters, as specified in Element #8, provided <br />the dewatering flow does not cause erosion or flooding of receiving waters. Any highly turbid <br />water should be handled separately from storm water. <br />If groundwater, or other storm water, is encountered in an excavation or other area, control, <br />treat, and discharge it as follows: <br />• Infiltration <br />• Transport offsite in vehicle, such as a vacuum truck, for legal disposal in a manner that <br />does not pollute state waters <br />• DOE-approved onsite chemical treatment or other suitable treatment technology <br />• Use of sedimentation bag with outfall to a ditch or swale for small volumes of localized <br />dewatering <br />TESC Plan and SWPPP 2 June 2015 <br />American Legion Memorial Park Page 12 <br />