Method Statement for Excavation and Foundation Preparation for Building Structures

Table of Contents

1. Purpose

• Scope of Work

• Definitions

• References

• Materials

• Plant  & Equipment

• Safety

• Prior Activities

• Procedure

1. Responsibilities

1. Attachments

 

1.0       Purpose

1. To ensure that all excavation and foundation preparation of building activities are executed safely and in accordance with the contract requirements and that all quality assurance / control activities are conducted in a systematic manner, works are inspected and conformance is verified and documented.

2.0       Scope of Work

• This procedure is applicable to the following works associated with the project titled, New 2k Runway.
• Main Runway Works”- contract number NRTW-1008-CN
• General Excavation for buildings associated with the main runway works.

3.0       Definitions

• CM                  Construction Manager
  • SE                   Site Engineer
  • CS                   Chief Surveyor

3.4    ME                  Material Engineer

3.5    ESHO              Environmental, Safety, and Heath Officer

3.6    ITP                  Inspection Testing Plan

3.7    AHA                 Activity Hazard Analysis

3.8    JHA                 Job Hazard Analysis  

• References

4.1    Specifications:             Vol. 3 – Section 9 – Part A – General Civil &Mechanical  

                                             Infrastructure.

4.2    Drawings                     Vol. 2 – Section 8 – Part D Architectural & Structural

4.3    Bills of Quantities         Bills 12, 13, 14, 15, 16, 17 & 18

• Materials

• Warning tapes
  • Temporary signs
  • Safety Barriers
  • Traffic Cones
  • Grade Stakes
  • Flashing and rotating lights

• Tools, Plant & Equipment

• Excavators
  • Graders
  • Wheel Loaders
  • Vibrating Rollers
  • Shovel
  • Water Tankers
  • Plate Compactors
  • Personal Protective Equipment (PPE)

 

7.0       Safety

• Prior to the commencement of any activities, the workforce will receive an induction talk on the project site safety requirements. This induction talk will include both activity safety issues, as well as general safety requirements.

• The necessary safety measures will be taken to prevent accident or injury at all times. This may include barriers, warning tape/net, signage, watchman, flashing and rotating lights at night.

• Where work upon existing services may be required, the necessary work permits and safety equipment should be obtained prior to the activity commencement.

• Front Line Supervisor will ensure that Personal Protective Equipment is worn by site personnel at all times during construction activities.

• Heat Stress Training will be provided.

• Provisions of adequate cool drinking water, shade, and salt tablets will be in place.

• Plant & Equipment will be provided with back-up alarms, lights, and all other applicable safety devices.

• For AOA work, safety requirements as defined in Project Specification, Section 107, will be implemented. Specific safety training will be provided to personnel for AOA work.

8.0       Prior Activities

• The Surveyor will locate and mark all live services that are present in the site (This includes above ground services as well as buried services). These services (Electric, Telephone, Gas, Oil, Chemical, Water, etc) will be clearly marked using stakes and warning tapes. Near these services, only manual excavation is permitted.

• Limits of the areas to be excavated as shown on drawings will be clearly marked with stakes, tape, or bright paint.

• Final approval of foundation level details should be obtained from the Engineer, through the shop drawings submittal.

• Requests will be made for survey checking , commencing of excavation , formation checking and compaction tests .

• Well – point dewatering, though not expected to be required, will be used if indicated by trial pit excavation.

• Procedure

   9.1  Excavations shall be carried according to the lines and grades indicated on the    approved shop drawings by using Excavator as per clause 201.2.1

   9.2  Excavations dimensions will allow for the necessary working distance around the   structure to permit the erection and removal of scaffolding and formwork (approx. 2m from concrete edge).

• The excavated materials shall be removed by dumper trucks as per clause 201.2.5 

   9.4   Stock area for soil that might be reused shall be arranged .

9.5    The bottom of excavation shall be watered, leveled and compacted.

9.6    The formation level shall be examined and soft spots , deleterious or loose materials  

            shall be removed.

9.7   Bottom level of excavation and compaction will then be checked for approval by the Engineer’s Inspectors before any further activities are carried out as per clause 201.2.8

10.0   Responsibilities

1. The CM will coordinate with SE to ensure that the necessary resources to implement the approved Method Statement, JHA and AHA have been allocated to the task.

1. The SE will ensure that the site preparation activities are conducted according to the approved Method Statement, JHA and AHA.  The SE will also ensure that all in-situ tests, as required by the ITP are implemented.

1. The ME will ensure that the materials being used are in accordance with the Project Specifications and approved Material Submittals.

1. It is the site supervisors responsibility to organize the work in a safe manner to ensure that safety and protective equipment are being properly utilized.  He must also ensure that the AHA and JHA are implemented and the approved Method Statement procedure is followed and the ITP is applied.