Method Statement for Earthworks, Excavation and Backfilling.

Table of Contents

1.             Scope /Objectives

2.             Reference

3.             Access/Egress

4.             Logistics

5.             Health and Safety Hazards

6.             Definitions

7.             Responsibilities / Supervision

8.             Procedures /Method to be Employed

9.             Training

10.          Working hours

11.          House keeping

12.          Manpower Requirement & Supervision

13.          Material Requirement

14.          Plant & Equipment Requirement

15.          Q.C Approvals and other Documentation

16.          Supporting documentation

17.          Distribution

18.          Other information

19.          Site Safety Engineer’s Approval

20.          Attachments (Compulsary)

·      Risk Assessment

·      Inspection and Test Plan

·      Quality Control Check Lists

  

1.       SCOPE & OBJECTIVES

         This Method Statement outlines the procedures for Earthworks, Excavation and Backfilling.

2.       REFERENCES

Contract Drawing and specification

2.1    QCS Section 12 Earthworks and Particular Specification Clause 5.2

2.2    AMTC HSE Guidelines

2.3    British Standards – BS 1377 : Test on Soils

2.4    Project Specs, Section 12 - Earthworks

3.       ACCESS/ EGRESS

Access will be through designated entrance and exit pathways.

4.       LOGISTICS                                                                       

Contractor will deploy a dedicated team for the earthwork, excavation and backfilling.

                              

5.       HEALTH &  SAFETY HAZARDS

Contractor will comply with all safety measures as applicable to project safety requirements.

5.1    Excavations shall be inspected daily by Section Engineer / Supervisor / Safety Officer.

5.2    Excavation shall be re-inspected after rainstorms, earthquakes or any other hazard increasing occurrences.

5.3    A convenient and safe means of access such as stairway, ladder or ramp shall be provided for employees to enter and leave the excavated area.

5.4    Safe crossings shall be provided over trench excavations.

5.5    Before opening any excavation, all underground services shall be identified and the Supervisor shall explain to the employees all the necessary precautions that need to be taken in the work preparation.

5.6    In no case the excavated material shall be placed closer than 600mm from the edge of the excavation.

5.7    Excavations shall be provided with warning barricades.  Deep excavation to be barricaded with flashing lights during night.

5.8    The sides of excavations shall be sloped in order to avoid sliding of sand / earth.

5.9    Personnel Protection Equipment’s shall be used at all the times.

6.       DEFINITIONS

AEB – Arab Engineering Bureau (Consultant/Engineer)

AMTC – Abdullah Al Muftah Trading and Contracting Co., w.l.l (Main Contractor)

MS – Method Statement

QCP – Quality Control Procedures

ITP – Inspection and Test Plan

ITA – Independent Testing Agency

7.       RESPONSIBILITIES / SUPERVISION

The works will be undertaken by AMTC with a competent workforce to do the works conforming to the project specifications through the following responsibilities.

7.1 Project Engineer shall be responsible for the execution of this procedure and to ensure that works are undertaken in a safe manner to the requisite quality and to the time agreed timescale. He shall advise and coordinate with other contractors pertaining to access and interface requirements related to the excavation works to be undertaken.

7.2 Site Engineer shall be responsible for the site implementation of this procedure including control and the safety of the workers.

7.3 QA/QC Inspector shall be responsible for the supervision of tests and inspection, control approvals for testing    and inspection plan and to arrange documentation required.

7.4 The Surveyor in coordination with site engineer has the responsibility to perform all survey works according                to the IFC drawings.

7.5 Safety Officer shall be responsible for the strict implementation of safety procedure during work commencements.

8.       PROCEDURE / METHOD TO BE EMPLOYED:

8.1Preliminaries

a.       Excavations shall be inspected daily by the Site Engineer / Supervisor / Safety Officer.

b.       Excavation shall be re-inspected after rainstorms, earthquakes or any other hazard increasing occurrences if any.

c.         A convenient and safe means of access such as stairway, ladder or ramp shall be provided for employees to enter and leave the excavated area.

d.        Safe crossings shall be provided over trench excavations.

e.        Before opening any excavation, all underground services shall be identified and the Supervisor shall explain to the

                employees all the necessary precautions that need to be taken in the work preparation.

f.          In no case the excavated material shall be placed closer than 600mm from the edge of the excavation.

                 Excavations shall be provided with warning barricades.  Deep excavation to be barricaded with flashing lights during

                 night.

g.       The sides of excavations shall be sloped in order to avoid sliding of sand / earth.

       

         8.2 Setting out

a. Setting out of surveyed stations to be carried out from the approved control stations provided by BEST Bureau of Engineering Studies and temporary benchmarks. The extent of excavation shall be marked with the provision for working space and slopes for deep excavation. Level +3.0 QND as the starting level of the excavation.

b. Existing underground services are to be exposed and identified by hand excavation. These will be as-built and incorporated to the new services which will be formed as the combined services drawing. 

Proposed works to be done shall be submitted for Client approval.

      

        8.3 Sequences of Excavation will be executed as follows :

                                                                                                                                                                                                     

• The whole area will be scraped by bulldozers up to rock formation level which is the bottom of raft foundations/footings.

•The isolated foundations will be excavated down to the top level of hard rock.

•The foundations Pool Annex will be excavated -1.17M QND Level. The foundations for Main Villa will be excavated -0.82M QND Level. The Swimming Pool will be excavated -0.185M QND.

        Excavation level will be the bottom of foundation plus blinding thickness. 

        Backhoe/Excavator equipment will be used for excavation of desert fill materials

        Limestone / rock strata will be by excavator / rock breaker.

Excavated blinding levels will be tested for the required bearing capacity by relevant tests.

Hand Tools shall be used to do manual excavation as required.  Care to be taken to protect existing structures / underground services if any, while excavating adjacent to them.

Heavy equipment will not be allowed to access whenever the required excavation/formation level is reached to avoid disturbance of the strata.

        Independent Testing Laboratory shall be submitted to Client for approval.

8.4 Backfilling

Backfilling to be carried out around the structures in 250 mm thick layers with approved fill material.  Compaction will be done by jumping rammers / rollers / plate compactors as required to achieve the required minimum of 95% MDD.  Moisture content of the fill will be maintained within +/-3% of Optimum Moisture Content to achieve compaction requirement as per Clause 3.5 of QCS Section 12 Part 3.

The density of any layer requiring compaction shall be determined in accordance with the specifications at a minimum rate of one test per 100 meter run or 500 meter square, whichever is less.

The oven drying of soil and aggregates samples for testing shall not be carried out at a temperature in excess of 60° C and 100° C respectively.

The minimum frequency of density testing shall be 1 test per 500 m2 of prepared area or tests shall be carried out as directed by the Engineer.

8.5 Disposal of Materials

Excavated materials will be stockpiled on a designated place as agreed with the Engineer.

Suitable material arising from the excavation shall be screened and used for backfilling.  Unsuitable excavated material shall be disposed to an approved Government tip off location.

9.       TRAINING

      

Relevant trainings and orientations have been provided to person who will perform their specified task.

10.    WORKING HOURS

The working hours will be from 6:00AM to 6:00PM as agreed, with break time in between.

11.    HOUSE KEEPING

                                                                                               

Working Areas will be kept clean by disposing the waste materials at the designated areas.  At the end of  days’ work, installation supervisor will ensure that the debris are disposed off.

12.    MAN POWER REQUIREMENT

Foreman

Laborers

Operators

13.    PLANT & EQUIPMENT REQUIREMENT

                                                                                              

Excavator/Backhoe

Dump truck

14.    QC APPROVAL AND OTHER DOCUMENTRY REQUIREMENTS:

Follow approved Method Statement, ITP, QCP, HSE Plan, Material Approval & Checklist.

              

15.    SUPPORTING DOCUMENTATION:

This MS to be read in conjunction with the below referenced documents

·         Contract Specification & approved drawings.

·         Project Quality Plan

·         Project HSE Plan

16.    DISTRIBUTION

Copies of this MS will be circulated to the following for Information & action

·         Project Manager

·         Site Engineer

·         QA/QC Engineer

·         HSE Engineer

17.    OTHER INFORMATION

               Ensure that all the activities have been carried out to suit the site conditions and involved

                                                                          With Site –in – charge

  

18.    MAIN CONTRACTORS SAFETY ENGINEERS APPROVAL

APPROVAL STATUS		SIGNATURE
	Approved
	Approved subject to compliance with the following notes
	Not Approved – with reason

19.    ATTACHMENTS (Compulsory)

Risk Assessment

 Inspection & Test Plan

Quality Control Check Lists