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3) Shall be operated in such a manner as to prevent damage to other property. b. Gravity underdrain systems 1) Shall have adequate capacity to lower the water level in the trench such that the main utility may be laid “in the dry.” c. Sumps 1) Shall be provided at various points along the route of the underdrain system for the use of pumps to remove the water. 2) If the material encountered at trench grade is suitable for passage of water without destroying the sides or bottom of the trench sumps may be provided at intervals at the at the side of the main trench excavation and pumps may be used to lower the water level by taking their suction from these sumps. 3) Care shall be exercised to prevent the movement of utility foundation material and a bed of crushed stone may be required. B. Grading shall be done, as may be necessary to prevent surface water from flowing into the excavation, and water accumulating therein shall be removed so that the stability of the bottom and sides of the excavation is maintained. C. The excavation shall be dewatered by appropriate methods where and when necessary to maintain a dry and stable excavation bottom, and keep free from water during construction. D. Obtain required dewatering permits from applicable agency having jurisdiction. 1. Costs of complying with such permit requirements shall be borne solely by the CONTRACTOR. E. Water from trench dewatering operations shall be disposed of without causing damage or inconvenience to the work, the surrounding area or general public. 3.10 OBSTRUCTIONS A. The exact location of pipes, conduits, wires, mains, footings and other underground structures and obstructions encountered in trenching or excavating shall be determined. B. The obstructions shall be protected adequately from damage or displacement. City of Sunny Isles Beach NE 174th Street Roadway Improvements 02300 - 10 Earthwork 14-1758 / 09-19-2014