1. SCOPE

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

 

2. PROCEDURE

.1All sewerage and surface water drainage works will be carried out in accordance with 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:

i)    Proposed plant and equipment.

ii)    Jointing technique.

iii)    Trench support (in case of deep excavation).

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

v)    Sequence of activities.

vi)    Compaction method and quality of fill material.

vii)    Test plan.

.3 Check delivery order and certificates against the specification and examine marks, labels and condition of material and components.

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

 .5 Before commencing excavation, fence or board the area of work so as to prevent unauthorised 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 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 pipe manufacturer. Ensure that jointing faces are dry, clean and free from soil or bedding particles.

.11 Finalise an intermediate test plan and water testing to be done to check water tightness of pipeline.

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.

 

 

SUBCONTRACTOR:CLIENT

SECTION OF WORK ____________________________ LOCATION _________________

 

STAGE

ITEM

Checked

by

DATE

PIPEWORK OR

 

CHANNEL

 

1. Set line and level.

 

SU

2. Check location of underground services before

 

commencement of excavation.

 

SE

 

3. Checkinverts levels and gradients.

 

SU

 

4. Check correct diameter and material. Also check the compatibility of pipes, fittings and accessories for jointing e.g. ring seals, solvent cements, lubricants.

 

 

 

SE

 

5. Check position and no. of connections.

 

SE

 

 

6. Check availability of trench support material.

 

GF

 

 

7. Check bedding and granular surround.

 

GF

 

 

8. Backfill to specification material/compaction.

 

SE

9. Ensure protection of laid pipeline from damage byconstruction traffic.

 

SE

10. Pipe run rodded and tested.PE/MEP

 

APPROVAL TO PROCEED

 

QA/QC

GULLEY

 

CONNECTION

 

1. Check correct gulley used.

 

SE

 2. Check position and level of gulley.SE/SU  3. Check correct surround.GF  4. Check gulley grid.GF  5. Check gulley cleaned out.GF

 

APPROVAL TO PROCEED

 

QA/QC

 

 

 

QA/QC – Quality Assurance/Quality Control, PE – Project Engineer, SE – Site Engineer,

SU – Surveyor, MEP – MEP Coordinator, GF – General Foreman

 

QA/QC – Quality Assurance/Quality Control, SE – Site Engineer, SU, – Surveyor, GF – General Foreman

 

Download Underground Sewerage and Surface Water Drainage Method Statement in word format: CONTROL OF SEWERAGE AND SURFACE WATER DRAINAGE