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Element 10: Control Dewatering (2.1.10) <br />Dewatering may occur at excavations for sewer installations. The source of water in these areas <br />is groundwater, the groundwater is not known or anticipated to be contaminated. <br />Table 3 — Dewatering BMPs <br />Infiltration <br />X <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 />X <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 />Baker tanks will be used for dewatering. <br />List and describe BMPs: <br />Installation Schedules: <br />Inspection and Maintenance plan: <br />Portable Tanks/Baker Tanks <br />Prior to construction dewatering activities <br />Inspection and Maintenance shall be <br />performed per BMP guidelines and <br />manufacturer recommendations. <br />Responsible Staff: CESCL (TBD by Contractor) <br />