Example of type B-3 specifications (dewatering)

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a. General.

(1) The dewatering system shall be designed by the Contractor using accepted and professional methods of design and engineering consistent with the best modern practice.

(2) The dewatering system shall be of sufficient size and capacity as required to control ground and surface water flow into the excavation and to allow all work to be accomplished in the “dry.”

(3) The Contractor shall control, by acceptable means, all water regardless of source and shall be fully responsible for disposal of the water. The Contractor shall confine all discharge piping and/or ditches to the available easement or to additional easement obtained by the Contractor. All necessary means for disposal of the water, including obtaining additional easement, shall be provided by the Contractor at no additional cost to the owner.

b. Design.

(1) Contractor shall obtain the services of a qualified dewatering “Expert” or a firm to provide a detailed plan for dewatering the excavation. Contractor shall submit his or her dewatering plan to the Engineer for review and approval. The material to be submitted shall include, but not be limited to, the following:

(a) The qualifications and experience of the selected dewatering “Expert” or the firm (minimum of 5 years of proven experience in the design of equivalent

system required).

(b)Drawings showing the soil conditions, stratification, and characteristics; location and size of berms, ditches, and deep wells; piezometers, well – points; and sumps and discharge lines or ditches.

(d) Design calculations including design parameters and basis of such parameters, factors of safety, characteristics of pumping equipment, piping, etc.

(e) Detailed description of procedures for installing, maintaining, and monitoring performance of the system.

(2) Notice to Proceed issued by Engineer or receipt of the dewatering plans and data submitted by Contractor shall not in any way be considered to relieve the Contractor from full responsibility for errors therein or from the entire responsibility for complete and adequate design and performance of the system in controlling the groundwater in the excavated areas, The Contractor shall be solely responsible for proper design, installation, operation, maintenance, and any failures of any component of the system.

(3) The Contractor shall be responsible for the accuracy of the drawings, design data, and operational records required.

c. Damages. The Contractor shall be responsible for and shall repair without cost to the Owner any damage to work in place, other Contractor’s equipment, utilities, residences, highways, roads, railroads, private and municipal well systems, and the excavation, that may result from his or her negligence, inadequate or improper design and operation of the dewatering system, and any mechanical or electrical failure of the dewatering system.

d. Maintaining excavation in dewatered condition, Subsequent to completion of excavation and during the installation of all work in the excavated area, the Contractor shall maintain the excavations to a dewatered condition. System maintenance shall include but not be limited to 24-hour supervision by personnel skilled in the operation, maintenance, and replacement of system components, and any other work required to maintain the excavation in a dewatered condition. Dewatering shall be a continuous operation and interruptions due to outages, or any other reason, shall not be permitted.

e. System removal. The Contractor shall remove all dewatering equipment from the site, including related temporary electrical service. All wells shall be removed or cut off a minimum of 3 feet below the final ground surface and capped. Holes left from pulling wells or wells that are capped shall be grouted in a manner approved by the Engineer.