3303.14.5.1 Dewatering plan.
BC § 3303.14.5.1
Where dewatering is performed to drawdown or control the level of the water table, the dewatering operation shall proceed in accordance with a site specific plan developed by a registered design professional. The dewatering plan must incorporate all the conditions and findings identified in the geotechnical report required by Section 1803.6, the evaluation analysis required by Section 1817, and the preconstruction survey required by Section 3309.4.3. At a minimum, the plan shall indicate: 1. Height of the water table, including all seasonal fluctuations; 2. Anticipated schedule of dewatering operations; 3. The location of wells, settlement tanks, observation points, and dewatering equipment; 4. Maximum discharge; 5. Permissible drawdown outside of the limits of the excavation; 6. Thresholds for anticipated settlement; 7. Thresholds for anticipated lateral movement; and 8. The program to monitor and control water table drawdown and settlement/movement of affected structures, property, and temporary construction installations. Program criteria to be specified shall include, but not be limited to, the monitoring frequency, plan to periodically test the discharge from the pumps to determine if the water being extracted contains unanticipated fine grain soil or sand, plan to account for fluctuations in the water table (due to seasonal conditions, weather, or other factors), reporting requirements for the monitoring program, and procedures to be implemented when thresholds are exceeded.
