Method statement for external drainage works

Stage 1:Preliminaries and General Work

A. Contractor shall submit the proposed material and related miscellaneous item  as following item to    superintending officer (S.O) or his representative (S.O.R) for his approval.

1. 
   
2. Concrete mix design
3. Steel bar mill certificate
4. Detail Work Program
5. Reinforce concrete pile specification
6. piling set calculation
7. method statement for test pile and loading test
8. Quality control and Quality plan

Stage 2 : Construction Work Method statement

1. Prior to any excavation works and any other works related to external drainage system contractor shall prepare and proceed with the drain alignment and invert level setting out.
2. Upon completion of the setting out, Request for inspection form shall be submitted to superintending officer (S.O) or his Representative (S.O.R) to allow inspection being conducted before any subsequent work start. 
3. The excavation works can only start upon receipt of official acceptance for the setting out and approval to proceed works with subsequent activity.The Official reply on the inspection can be recorded in the submitted Request for inspection work or by any other means preferred by S.O/S.O.R.
4. Excavation work shall be done using combination of manual Labour and machinery.
5. Upon completion of the excavation work, contractor once again shall submit to S.O/S.O.R Request for Inspection form to enable inspection being conducted to confirm that the invert level of the drain are as per requirement.
6. Contractor then proceed with the setting out of the pile location for the piling work upon acceptance and approval to proceed with subsequent work from S.O/S.O.R.
7. When ever Contractor feel that the setting out for pile position have reach the numbers that is practical for them to proceed with pile driving work, Contractor shall once again submit the Request for Inspection  to enable inspection being carry out by S.O/S.O.R for the pile location setting out.
8. During the inspection and upon acceptance of the setting out by S.O/S.O.R, he shall determine the particular location for the test pile and pile loading test.
9. Contractor shall proceed with the first pile location that is the test pile location. There shall be no further pile driven work being carried out before the result of the test pile and pile loading test is approved and accepted by S.O/S.O.R . The Result MUST fulfil the design requirement.
10. Once the test result is deem to be in compliance with the requirement and officially approved and accept by S.O/S.O.R , Contractor then can continue with the remaining Pile drive in work and followed by cutting off the excess pile. 
11. All pile that are going to be used shall be properly inspect by S.O/S.O.R for any defect prior to piling works. Shall there be any unsuitable pile being detected, S.O/S.O.R shall give official instruction to contractor to remove out the pile from site as to prevent defective pile being use for the permanent works.
12. There shall be no piling works being carried out with out supervision of S.O/S.O.R.
13. Upon completion of the piling work, Contractor then proceed with the structure work of the drain.
14. the subsequent work are as follows;

• preparation of pile head
• laying of granular bedding
• laying of the lean concrete
• installation of the steel reinforcement for the drain
• installation of the formwork
• drain structure concreting work
• Curing works for the concrete
• removing the formwork
• Inspection to the concreted drain to detect any minor and major defect for immediate rectification work
• Inspection for the final invert level as to verify the constructed drain invert level are as per requirement.

15. Concreting work shall not being carried during raining day.

16. All inspection shall be conducted by S.O/S.O.R in the present of contractor.

17. Sample of concrete that being delivered to site shall be taken  for every 5 cu.m delivered batch and being                 tested for 3 day, 14 days and 28 days strength to make sure that the concrete use is as per requirement.

18. Shall the concrete grade is found to be of the lower grade, S.O/S.O.R shall request the contractor to do the rectification work according to a proper method requested by S.O/S.O.R.