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2.1.10 Element 10: Control Dewatering <br /> Large scale dewatering is not anticipated for this site; however, small amounts of perched <br /> groundwater water may require dewatering from utility trenches or other excavation activity. <br /> Non-contaminated turbid dewatering effluent will be routed the existing Stormwater Quality <br /> Pond 2 onsite via stormwater management BMPs. Contaminated dewatering effluent will be <br /> hauled off-site for legal disposal or directed to sanitary sewer with local sewer district approval. <br /> Table 4— Dewatering BMPs <br /> ❑ Infiltration <br /> ® Transport off-site in a vehicle (vacuum truck for legal disposal) <br /> ❑ Ecology-approved on-site chemical treatment or other suitable treatment technologies <br /> ® Sanitary or combined sewer discharge with local sewer district approval (last resort) <br /> ❑ Use of sedimentation bag with discharge to ditch or swale (small volumes of localized <br /> dewatering) <br /> List and describe BMPs: See other elements for onsite stormwater management BMPs. <br /> Installation Schedules: During trenching activity. <br /> Inspection and Maintenance plan: Daily during trenching activity. <br /> Responsible Staff: TBD. <br /> Page 116 <br />