Specifications - City of Montpelier, Vermont

Montpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Title:02140 – DewateringPage #:2 of 21. Minimize hydrostatic forces on excavation support equipment.2. Prevent migration of soil from the sides of the excavation into the excavation.3. Prevent against trench and excavation instability and bottom heaving.4. Allow construction of utilities and structures in the dry.PART 2PRODUCTSNOT USEDPART 3EXECUTION3.1 DEWATERING OPERATIONSA. Provide, install and maintain dewatering system(s) if water interferes with constructionoperations.B. Keep excavations dry until the utilities, structures, and appurtenances to be built thereinare completed to such an extent that they will not be damaged.C. Maintain the water 2 feet below the bottom elevation of the excavation of backfill withinthe excavation.D. When necessary, thoroughly brace all structures, pipelines and tanks which are not stableagainst flotation.E. Dewatering systems that damage or threaten to cause damage to new or existing facilitiesshall be modified to correct such problems or shall be removed.F. All water shall be disposed of in a manner that:1. Minimizes sedimentation and erosion.2. Is in accordance with all applicable local, state, and federal ordinances, statutes,regulations, and laws.3. Is in conformation with hazardous materials regulations and laws.G. Provide sedimentation basins, level spreaders, riprap, silt fencing and othersedimentation and erosion control devices as necessary and as directed by the Owner'sRepresentative.H. Remove dewatering system when no longer required.I. Restore areas affected by dewatering operations to their original condition.END OF SECTION 02140DEWATERING 02140 2