902PUMPING OR DEWATERING OPERATIONS

902.1Description.

interagency Memorandum of Agreement. Covered work includes the following activities:

per day.

pass pumping at rates exceeding 50,000 gallons per day are permitted provided no water is withdrawn for consumptive use and all water is returned to its natural course immediately downstream of the work area.

withdrawal rates in excess of 50,000 gallons per day are necessary.

construct and complete the Work from DNREC, Division of Water, Water Supply Section, unless covered in the Statewide General Permit for Minor Dewatering Activities.

possibly a public hearing before DNREC will issue a permit. Ensure that sufficient permit acquisition time is included in the project schedule to obtain the permit. Time extensions will not be granted for failure to account for this time in the Project Schedule.

Environmental requirements are more fully described in the Project Environmental Statement. ii. The Statewide General Permit for Minor Dewatering Activities does not constitute approval, exemption, or waiver from any other law, rule, or regulation that may apply to the work shown in the plans or the activities necessary to complete the work. See Specification Section 107.2.

dewatering equipment, or employ the services of properly licensed subcontractors such as a well driller when an individual dewatering permit is required.

902.2Material.

Provide materials as necessary and required.

902.3Construction.

the necessary dewatering permit is submitted to the engineer.

continuous dewatering of the work area. Instantaneous and totalizing flow meters, accurate to within +/- 5 percent, are required on all dewatering equipment.

dewatering operations.

starting any dewatering adjacent to wetlands or if discharge water is proposed to be directed to any wetlands.

until the work has been brought to finished lines and grades and accepted by the engineer. None of the proposed work shown on the plans will be laid in water, unless otherwise indicated on the plans or directed by the engineer.

undisturbed areas into open excavations using any combination of berms, pipes, dikes, pumps, etc. in order to establish a clean water diversion. Comply with applicable sediment control measures.

adjacent property, buildings, structures, utilities, and other work. Protect adjacent structures and property from any damage that may occur as a result of settlement or other effects related to the removal of ground water and lowering of the water table. Do not drain dewatering discharge into work completed or under construction without prior consent of the engineer. Dispose of water in such a manner as not to be a menace to the public health. Discharging to the sanitary sewer system is not permitted.

water system is prohibited. Dewatering operations for the project cannot cause the inadvertent drawdown or dewatering of wetlands or other surface water bodies.

bag, dewatering basin, portable sediment tank, sediment trap, or sediment basin prior to release into ditches, storm drain systems, streams, or surface water bodies of any type.

temporary dike to create a temporary cofferdam, leave the sediment-laden water within the cofferdam undisturbed for a minimum of 12-hours to allow settling of suspended soil particles. Remove water from temporary cofferdams by skimming it off the surface. Immerse intake no more than 6-inches below the water surface. Once the water level has been pumped down, accomplish additional dewatering using a sump pit constructed in conformance with DelDOT Standard Construction Details. Any deviation from Standard Construction Details requires prior approval and may require an individual dewatering permit from DNREC.

continuous uninterrupted water service to any affected public or private potable water supplies or wells within the project area if adversely affected by the dewatering operations associated with this project.

902.4Method of Measurement.

Pumping or Dewatering operations will not be separately measured.

902.5Basis of Payment.

associated work items.

DNREC.