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 1. General Description

This specification outlines the requirements for excavation in all types of strata and formations. The work includes the removal of unuseful excavated material, sorting and stacking of useful materials in measurable conditions, transportation of materials up to a lead distance of 200 meters, execution of all lifts, and necessary dewatering to maintain dry working conditions.

2. Scope of Work

The Contractor shall perform the following tasks:

• Site Preparation: Clear the site of all obstructions, including vegetation, debris, and any other materials that may hinder excavation activities.

• Excavation: Excavate to the lines, grades, and dimensions shown on the project drawings or as directed by the Engineer. This includes working through various soil types, rock formations, and any unforeseen underground obstacles.

• Material Handling:

  • Unuseful Material: Transport and dispose of unuseful excavated material to designated disposal sites as approved by the Engineer.
  • Useful Material: Sort, clean, and stack useful excavated materials in an organized manner for future use, ensuring they are in measurable conditions.

• Transportation: Move excavated materials as required, ensuring that the lead distance does not exceed 200 meters.

• Dewatering: Implement dewatering measures to keep the excavation site free from water, ensuring safe and efficient working conditions.

3. Materials

• Backfill Material: When backfilling is required, use suitable materials free from organic matter, debris, and other deleterious substances. The material should meet the project specifications for gradation and compaction properties.

• Dewatering Equipment: Provide appropriate dewatering equipment, such as pumps, well points, or drainage systems, capable of effectively removing water from the excavation site.

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4. Execution

• Excavation:

  • Methodology: Select excavation methods suitable for the specific site conditions, considering factors such as soil type, depth, and proximity to existing structures. Methods may include manual excavation, mechanical equipment, or controlled blasting, as appropriate.
  • Safety Measures: Implement necessary shoring, bracing, or sloping to prevent soil collapse and ensure the safety of workers and adjacent structures.
  • Accuracy: Excavate to the exact dimensions specified in the project drawings. Avoid over-excavation; any unauthorized excess excavation shall be corrected at the Contractor's expense.

• Material Handling:

  • Sorting and Stacking: Identify and segregate useful materials during excavation. Clean and stack these materials neatly at designated locations for measurement and future use.
  • Disposal of Unuseful Material: Transport unuseful materials to approved disposal sites, ensuring compliance with environmental regulations and project specifications.

• Transportation:

  • Lead Distance: Ensure that the transportation of materials does not exceed a lead distance of 200 meters unless otherwise specified. Use appropriate vehicles and equipment to prevent spillage and contamination during transport.

• Dewatering:

  • Planning: Assess the site to determine the groundwater conditions and develop a dewatering plan accordingly.
  • Implementation: Install and operate dewatering systems to maintain dry and stable excavation conditions. Monitor water levels continuously and adjust the dewatering system as necessary.
  • Discharge: Dispose of the extracted water in a manner that does not cause erosion, flooding, or environmental harm, following all applicable regulations.

5. Measurement and Payment

• Excavation: Measurement shall be based on the volume of material excavated, calculated in cubic meters, as per the dimensions shown on the drawings or as directed by the Engineer. Payment includes excavation, sorting, stacking, transportation within the specified lead, and disposal of unuseful materials.

• Dewatering: Measurement shall be based on the duration and extent of dewatering operations required to maintain dry working conditions. Payment covers the provision, operation, and maintenance of dewatering equipment and the proper disposal of extracted water.

6. Quality Assurance and Control

• Inspections: Conduct regular inspections to ensure compliance with project specifications, safety standards, and environmental regulations.

• Testing: Perform necessary tests on backfill materials to confirm suitability concerning gradation, compaction, and moisture content.

• Documentation: Maintain detailed records of excavation progress, material quantities, dewatering activities, and any issues encountered, along with corrective actions taken.

7. Safety and Environmental Considerations

• Safety: Adhere to all relevant safety regulations, providing necessary protective equipment and training for workers. Implement measures to prevent accidents related to excavation and dewatering activities.

• Environmental Protection: Ensure that excavation and dewatering operations do not adversely impact the surrounding environment. Implement erosion control measures, manage waste responsibly, and comply with all environmental laws and guidelines.