Trench / Pit Dewatering Sample Clauses

Trench / Pit Dewatering. Item No. A19 Reference: OPSS.MUNI 517, 518, Geotechnical Report Under this item, for the unit price bid the Contractor shall complete dewatering operations during excavation and pump all excavations, up to 50,000 L/day, to ensure works are constructed in a dry condition. The method of dewatering shall be determined by the Contractor and must be approved by the Contract Administrator prior to the start of Construction in conjunction with Geotechnical Report and will likely involve sump pumping. Seasonal fluctuation in groundwater levels should be anticipated. The Contractor is to submit detailed drawings and specifications for the proposed method of dewatering prior to commencing construction. The Contract Administrator may require the Contractor to revise their method of dewatering if, in their opinion, the Contractor’s method is insufficient. The use of stone below pipe bedding shall not be permitted to replace proper dewatering procedures. Keep up-to-date records of groundwater levels, quantity of water being pumped and number of pumps operating on a daily basis. Copies of these records are to be provided to the Contract Administrator at regular project meetings, or upon request, as may be required. The Contractor is encouraged to use flow-meters which record data automatically. Works must comply with all local, Provincial and Federal Regulations pertinent to the Work and in particular, requirements of the Ontario Water Resources Act, Ontario Ministry of Labour, Construction Safety Act of Ontario (latest issue) and Trench Excavator's Protection Act and latest amendments thereto. The Contractor shall include all filtration, filter bags, check dams and all other materials/equipment required for filtration and sediment settling at discharge locations located at least 30 m from watercourses in a stable, vegetated area. Discharge from sending pits shall be extended and discharged beyond the location of receiving pits as required to minimize required pumping. The Contractor shall make use of approved sheathing and protective surfaces such as rip-rap to prevent erosion/sedimentation/scour at discharge locations. The water discharging from the approved sediment removal system shall be allowed to disperse over vegetated surfaces and enter the watercourse away from the work area. If conditions of the approved dewatering discharge location cannot be achieved, the Contractor shall consult with the Contract Administrator to determine an appropriate alternative. Routi...
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Related to Trench / Pit Dewatering

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