Underground Sewerage and Surface Water Drainage Method Statement

1. SCOPE

This procedure covers controls to be carried out during the construction of underground sewerage and surface water drainage works.

2. PROCEDURE

1. All underground sewerage and surface water drainage works will be done according to the contract specification and good practice. Where specifications are not provided or are incomplete, the matter shall be referred back to the consultant for additional information.

2. Depending upon the complexity of the work and the requirements of the PQP, a method statement shall be prepared and approved by the consultant which shall include the following:

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· Proposed plant and equipment.

· Jointing technique.

· Trench support (in case of deep excavation).

· Manufacturer’s jointing and installation details and test certificates (where relevant).

· The sequence of activities.

· Compaction method and quality of fill material.

· Test plan.

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3. Check delivery orders and certificates against the specifications and examine marks, labels, and conditions of material and components.

4. Unload and handle materials and components with care to minimize damage and soiling.

5. Before commencing excavation, fence or board the area of work to prevent unauthorized access. Provide adequate safeguards, e.g. gangways, handrails, notices or direction boards, and lighting at night.

6. Contact local authority departments to obtain details of existing underground services. Proper marking will be employed on the site to avoid damage to any adjacent services.

7. Provide adequate trench support to retain the sides of excavations and ensure the safe and proper construction of works and completion of backfilling.

8. Spoil heaps of stacked material and vehicles to be kept at a distance of more than the trench depth from the trench.

9. Temporary supports to excavations will be maintained in position until sufficient backfill has been placed and compacted to ensure the stability of the sides of the excavation.

10. Employ the proper jointing method as recommended by the pipe manufacturer. Ensure that jointing faces are dry, clean, and free from soil or bedding particles.

11. Finalize an intermediate test plan and water testing to check the pipeline’s water tightness.

3. DOCUMENTATION

1. Appendix FOUN/06A and Appendix FOUN/06/B shall be used to monitor drainage construction. Approval to proceed will be given by the QA/QC.

installation of underground sewerage and surface water drainage works

Don’t forget to download the Attachment: CONTROL OF SEWERAGE AND SURFACE WATER DRAINAGE

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