CONSTRUCTION SAFETY STUDY REPORT

SRG CIVIL PTY LTD CONSTRUCTION SAFETY STUDY REPORT

Page 1 of 86

CONSTRUCTION SAFETY STUDY REPORT

FOR

KEEPIT DAM UPGRADE

WORK PACKAGE 2 –

KEEPIT DAM POST TENSIONING

Incorporating Dam Safety Management Plan

PREPARED BY: SRG CIVIL PTY LTD

AUTHORISED BY: Andrew McFarlane

Last Revised DATE: 18th May2017


Page 2 of 86

TABLE OF CONTENTS

1. OUTLINE OF PROPOSED & EXISTING OPERATIONS ........................................................................5

Site location in relation to surrounding land uses ..............................................................................5

Site Layout ..........................................................................................................................................5

Purpose of Proposed Operation and Major Steps ..............................................................................6

Existing Operations .............................................................................................................................6

Major Contractors ..............................................................................................................................6

2. REQUIREMENTS OF the CONSTRUCTION SAFETY STUDY...............................................................7

3. STUDY METHODOLOGY ..................................................................................................................8

4. HAZARDS IDENTIFIED & PROPOSED SAFEGUARDS ........................................................................9

Keepit Dam Risk Register ................................................................................................................. 10

5. ASSESSMENT OF OPERATIONAL SAFEGUARDS ........................................................................... 11

6. SAFETY ASSURANCE .................................................................................................................... 12

7. CONSTRUCTION PROGRAMS ....................................................................................................... 14

Extent of Work ................................................................................................................................. 14

Concrete Works ............................................................................................................................ 15

Anchor Fabrication ....................................................................................................................... 15

Cable Anchor Hole Drilling ........................................................................................................... 16

Cable Anchor Hole Testing ........................................................................................................... 16

Waterproofing Grouting of Cable Anchor Hole ........................................................................... 16

Anchor Installation ....................................................................................................................... 16

Anchor Grouting ........................................................................................................................... 17

Anchor stressing ........................................................................................................................... 17

8. MANAGEMENT OF CHANGE ........................................................................................................ 18

9. Glossary & Abbreviation.............................................................................................................. 19

Appendix 1 - Draft Construction Programme ...................................................................................... 20


Page 3 of 86

Appendix 2 - Keepit Dam Risk Register ................................................................................................ 23

Appendix 3 - Hazardous Materials Register ........................................................................................ 46

Appendix 4 - SRG Polices ..................................................................................................................... 47

Appendix 5 - Examples of SRG Procedures .......................................................................................... 51

Appendix 6 - Checklist Hazardous Industry Planning Advisory Paper No.7 Construction Safety 2011 62

Appendix 7 - Dam Safety Management Plan ....................................................................................... 64


Page 4 of 86

EXECUTIVE SUMMARY

Description of Proposal

The proposal is Keepit Dam Upgrade Works Stage 2, Package 2 and includes strengthening

the concrete gravity sections and spillway piers via post tensioning works to be referred to

as Stage 2, Package 2 - Post Tensioning Works.

The main works package includes installation of post tensioned cable anchors in the

concrete section of the existing dam including the left abutment non-overflowing

monoliths, right abutment non-overflow monoliths and spillway piers and other associated

works.

Purpose and Scope

The purpose of this study is to identify potential hazardous incidents that may occur during

the construction phase of the above proposed project. The scope of the study is based

around the scope of the project and the draft construction program attached.

Major Findings

Major findings from the study are that the SRG procedures and processes will be sufficient

to manage all safety, quality and environmental hazards as identified in this report.

Major Potential Hazardous Incidents

The major potential hazardous incidents that were identified by the study include but are

not limited to;

- Flooding;

- Removal of Asbestos;

- Dam Safety;

- Working at Height.


Page 5 of 86

1. OUTLINE OF PROPOSED & EXISTING OPERATIONS

Site location in relation to surrounding land uses

The site is situated on the south-western corner of Lake Keepit approximately fifty (50)

kilometres from Tamworth NSW. Surrounding land uses include;

- Existing Keepit Dam;

- State Park and associated clubs including the Sailing and Fishing Clubs;

- Camping grounds and caravan park;

- WaterNSW site offices and living quarters;

- Private residences and farming land.

Site Layout

The site layout will include fabrication and storage beds, drilling and installation equipment

operating on dam crest and spillways, office facilities and amenities

The map below in Figure 1-1 indicates the site layout as per the tender submission. This

layout is subject to change once the construction team is mobilised.

Figure 1-1 Site layout

Dam Wall, right abutment monolith,

main spillway and left abutment

monolith

Fabrication and Storage

Beds for anchors, Office

and amenities


Page 6 of 86

Purpose of Proposed Operation and Major Steps

Keepit Dam is currently rated as having a high safety risk, with extreme consequences of

failure. The purpose of the proposed operation is to reduce the risk of failure of the dam

wall and achieve compliance with the requirements of the NSW Dams Safety Committee.

This will be undertaken through a two stage process – Stage 1 and Stage 2.

Stage 1

This package has been completed by John Holland.

Stage 2

WaterNSW has had the electrical plant and upgrade works completed and has elected to

implement the construction of the remaining works under Stage 2 under 2 separate works

packages namely:

- Package 2 – Post Tensioning Works on the Main Dam Wall;

- Package 3 – Dam Raising and Associated Works.

This Safety Study is for Stage 2, Package 2 – Post Tensioning Works.

Existing Operations

Existing operations at Lake Keepit include;

- The running of the existing Keepit Dam by WaterNSW;

- The caravan park and camping grounds including the general store;

- The Sailing Club;

- Farming and private residences.

Major Contractors

A large proportion of Stage 2, Package 2 works will be self-performed by SRG Civil Pty Ltd

employing local tradesmen. Specialist works and other works that the local market cannot

cater for will be subcontracted. Sub‐contractors that may be used include;

- Ok Steelfixing – Steel Fixing;

- Hiway Concrete – Concrete Supply.


Page 7 of 86

2. REQUIREMENTS OF THE CONSTRUCTION SAFETY STUDY

Condition 2.12 of the Project Approval for Keepit Dam Update requires that a Construction

Safety Study Report be prepared. The relevant requirements stipulated by the Conditions

of Approval are detailed in Table 3-1.

Table 2-1 Conditions relevant to the safety study

CoA No.

Condition Where addressed

2.12 Prior to the commencement of construction of the project, the Proponent shall:

2.12(a) Prepare and submit for the approval of the Director-General a Construction Safety Study. This study shall cover all relevant aspects details in the Department’s Hazardous Industry Planning Advisory Paper No. 7 ‘Construction Safety Study Guidelines’. The Proponent shall include a safety management plan as part of this study, in consultation with relevant authorities, addressing the safety of construction workers in the event of a flood, bushfire and other likely hazard or risk;

Dam Safety Management Plan, Keepit Dam Risk Register and Checklist for HIPAP No.7 & See Appendices 7, 2 and 6 respectively

2.12(b) Erect signs and fencing as necessary, to ensure the safety of bushwalkers etc near the site during construction;

Dam wall closed to Public, whole site fenced off to keep public away from construction works, Risk Register item 80

2.12(c) Provide adequate fire protection works on site during construction in consultation with the NSW Rural Fire Service;

Rural Fire Service have been consulted and we have been put on the Duty Roster. Latest contact was on 24/4/17 by phone and email. Risk Register items 16, 144 and 151

2.12(d) Ensure that all dangerous goods and materials stored on site are stored in accordance with the relevant Australian Standards; and

Keepit Dam Risk Register items 143,146, 148 & 151

2.12(e) Ensure that all explosives and fuel are removed from the site or disposed of appropriately at the completion of construction work.

Explosives are not required for this part of the work and will not be on-site. Fuel is used and will be removed from site at the end of the project refer to Keepit Dam Risk Register item 146


Page 8 of 86

3. STUDY METHODOLOGY

The methodology used in undertaking this Construction Safety Study Report (CSSR) was to

follow the recommended content and structure as detailed in Construction Safety

Guidelines – Hazardous Industry Planning Advisory Paper No.7 Department of Planning

(1992). The project was then broken down into the basic tasks / activities as per the SRG

program (see Appendix 1), and then identified the major hazards associated with each task

and proposed appropriate safeguards for these hazards.

This process is a procedure within SRG Civil and is set into our Risk Register. The Risk

Register is reviewed as detailed in our Work Health Safety Management Plan Rev 3 dated 2

March 2017 (WHSMP), to ensure the safe guards are working and adequate for the hazards

identified. This iterative process allows for changes to be flagged and amendments made as

required.

Other studies being undertaken concurrently include the development of the WHSMP Rev

3, Construction Environment Management Plan Final (CEMP) and Dam Safety Management

Plan.


Page 9 of 86

4. HAZARDS IDENTIFIED & PROPOSED SAFEGUARDS

The hazards identified and safeguards proposed are detailed in the Keepit Dam Risk

Register. Only the construction phase of the project has been examined. There is no

demolition or commissioning phase associated with this project.

The Risk Register flags possible hazards associated with the project and indicates whether a

more in depth study of the construction activity is required based on the hazards identified

and the inherent risk scores. An inherent risk score of high or extreme will automatically

require the development of a Work Method Statement (WMS).

The WMS document covers a single specific Workplace Activity developed in the Risk

Register. An example of this would be a WMS for Anchor Block Coring – Right Abutment

Spillway. The WMS is then broken down further into Safe Work Method Statements

(SWMS) within the WMS.

The WMS document for each activity is developed after site mobilisation and site survey

evaluation have taken place to ensure site specific hazards/issues are identified correctly

and accurately. Further to this the direct involvement of sub‐contractors (not yet finalized)

is required. The WMS document is facilitated by the Engineer responsible for the area of

work/activity and is developed through input from and mandatory consultation with;

- Site Project Manager;

- Site Superintendent;

- Safety, Quality and Environmental Representatives for the Project;

- Project and Site Engineers;

- Foremen;

- Sub ‐ Contractors.

The SWMS is developed at the start of the task to be undertaken and involves the

supervisor of the work and the work group performing the task. An example of a SWMS to

be developed from the above-mentioned WMS would be a SWMS for coring of holes for

anchor blocks.

Some of the key hazards identified in the WMS for the project include;

- Flooding;

- Working at Heights;

- Damage to existing infrastructure;

- Working with Plant & Equipment;


Page 10 of 86

- Re‐fuelling of Plant & Equipment;

- Environment incident;

- Asbestos removal.

Working with Plant & Equipment

As set out in our risk register the interaction between plant equipment and people will be

controlled by developing procedures to minimise the interaction between the various

elements. Use of engineered solutions for the support of the various pieces of plant that

will be required to carry out our work in the spillway.

Working at heights

We will use engineered solutions to obtain access to the spillway crest to carry out our

contracted works. These engineered solutions will come with handrails, kick boards etc to

contain our workforce so to remove the potential to fall from heights

Asbestos removal

A small amount of asbestos pipe has been identified cast into the concrete of the dam. In

the process of carrying out our work we will been required to core through this pipe in a

couple of locations. Processes are being developed which will estimate the volume of

asbestos that will be removed and the methods of coring with water & capturing waste

water and isolating this from those doing the coring and all personnel on site. This waste

material will then be disposed of in the correct method, this will all be done in consultation

with a registered asbestos contractor.

Flooding

SRG will be advised by WaterNSW of any impending flood event, and as such we will follow

the procedures set out in the Dam Safety Management Plan Appendix 7 Section 5.5. This is

basically that we will be instructed by WaterNSW that a flood event will be occurring and

we will follow all instructions as directed by WaterNSW site personnel.

Keepit Dam Risk Register

See Appendix 2 for Keepit Dam Risk Register. The Keepit Dam Risk Register is a live

document which is reviewed as per the WHSMP requirements.


Page 11 of 86

5. ASSESSMENT OF OPERATIONAL SAFEGUARDS

SRG Civil employ a number of processes and procedures to ensure all operational

safeguards identified are in place and adequate. These include;

- Regular review of the Risk Register as per the WHSMP;

- Development of WMS’s are included as hold points in the construction program (see

Appendix 1 – Draft Construction Program);

- SWMS implementation audits as detailed in Section 12 Targets of the WHSMP;

- Safety and Quality Audits as denoted in Section 12.2 Audit and Inspection of the

WHSMP;

- Safety targets including as denoted in Section 6.2 Objectives & Targets of the

WHSMP;

- Safety Buddy Walks incorporating Site staff, workforce and Senior Management;

- Key performance indicators such as LTIFR, TRIFR and safety meters as detailed in the

WHSMP.

Further to this SRG have procedures and accompanying permits for a whole range of

specific construction activities that are required to be adhered to when carrying out the

activity, some of which can be found in the appendix 5.

- Work at height;

- Work on Water;

- Hot Work;

- Electrical equipment including testing and tagging;

- Significant Lifts;

- Traffic Management;

- Scaffolding;

- Excavation and Trenching;

- Plant and Equipment;

- Training.


Page 12 of 86

6. SAFETY ASSURANCE

SRG Civil has a Quality Management System that is third party certified to AS/NZS

ISO9001:2008 and has a multitude of policies and procedures related to this standard that

ensure SRG Civil Projects are constructed to the highest quality standard, with the intended

aim of surpassing client expectations.

SRG Civil has a vision of ‘Zero Harm’ which is championed by Senior Management and is a

culture by which the business operates.

The SRG Civil Policy Statements (Appendix 3) are what the project will base its objectives on

and give good incite as to how we aim to achieve the assurance of safety for this project.

Involvement of all participants – Is managed through the roles and responsibilities matrix in

the DSMP section 7 in appendix 7.

Documentation – Is managed through the Project Quality Management Plan Keepit Rev 3

(QMP) and other SRG Civil procedures. The project personnel responsible for

implementation, monitoring and review of these procedures is documented in the roles and

responsibilities matrix in the QMP (under development). All these procedures will be

forwarded to Water NSW for his approval prior to the work commencing.

Materials of Construction – Materials used for construction will be as specified in the

contract documentation and drawings. Compliance with the specified materials will be

ensured through Quality ITPs and Checklists developed in accordance with the QMP,

relevant SRG Civil procedures, contract specifications and Australian Standards. Testing of

materials will be by NATA approved laboratories as and when required and specified in

contract.

Fabrication – There will be a requirement for fabricated items, all materials required to be

fabricated will be procured through suppliers that are ISO 9001 accredited.

Installation – A detailed Construction Program is developed which becomes the installation

schedule. There are hold points / milestones within this program to develop WMS’s. These

WMS’s will address the type of quality documents required for each activity. The roles and

responsibilities matrix within the QMP will nominate who is responsible for the

documentation of installation for each activity. Engineers in charge of each section of works

will regularly inspect the installation works. These inspections will include, Pre ‐ concrete

pour checks, checks of steel reinforcing for correct sizes, lengths, laps etc, cover to

concrete, Grout quality sampling, ensuring specifications are met and other inspections as

indicated by the Quality ITP’s and Checklists.


Page 13 of 86

Critical verification/safety reviews – Critical verifications are built into both the program and

Quality ITP’s as hold points. No work can commence until a hold point is signed off by the

Client Superintendent as specified in the contract terms and specifications. Safety reviews

are carried out on and ongoing basis as detailed in the SMP.

Training/Qualifications – A detailed training plan is currently being developed and will

indicate all requirements to ensure the proper construction of the project.

Definitions of responsibilities – The responsibilities matrix in the WHSMP indicates the

responsibilities of all persons involved in the project from a safety aspect. The

responsibilities matrix in the QMP indicates the responsibilities of all persons involved in the

project from a quality aspect.


Page 14 of 86

7. CONSTRUCTION PROGRAMS

The construction program is attached in Appendix 1.

It breaks the project down into the major activities to be undertaken. Each activity is

accompanied by a WMS start milestone. These milestones indicate the requirement for

detailed analysis of the activity from a Safety, Quality and Environmental perspective.

Extent of Work

In broad terms, the Works comprises:

- demolition and concrete surface preparation works for dam monolith blocks

comprising the left abutment non-overflow blocks, overflow sections and right

abutment non-overflow blocks and downstream face of the spillway piers;

- drilling of vertical holes for cable anchors through the existing concrete of left

abutment non-overflow blocks, overflow sections and right abutment non-overflow

blocks and into the foundation rock and completion of all waterproofing required as

a prerequisite to installation of the cable anchor components;

- drilling of inclined holes for cable anchors through existing concrete of the spillway

piers;

- supply of all cable anchor components for 91 strand and 65 strand anchors to the

project site;

- installation, including grouting, of all cable anchors into drill holes for dam monolith

blocks and spillway piers;

- supply and installation of precast anchor head blocks for cable anchors in the dam

monoliths blocks;

- drilling and grouting starter bars and reinforced concrete construction for the

spillway piers;

- stressing of cable anchors to specified design loads;

- supply and installation of metal covers for cable anchor installations including all

associated corrosion protection for cable anchors and covers;

- drilling of drain holes through concrete from cable anchor pits to downstream face

of dam;

- drilling of hole through concrete for vent pipe installation;

- supply and installation of miscellaneous items of metalwork;

- miscellaneous concrete construction.


Page 15 of 86

Concrete Works

Concrete works include spillway pier anchor bearing pad and miscellaneous concrete to

various pits.

Concrete supply will be by way of an off-site batch plant. Concrete mix design and trial

mixes will be developed and tested to ensure compliance with specification requirements.

All formwork and falsework drawings will be certified by a suitably qualified temporary

works designer and proof checked. A letter of certification will be provided.

Formwork will be fabricated for the spillway bearing pads. It will be installed in panels of

suitable size for the crane used.

The formwork fabrication and erection will be self-performed by SRG Civil.

Reinforcing steel will be inspected during unloading to ensure the delivery matches the

accompanying schedule. Steel deliveries will be timed so that steel is not sitting on site for

an extended period of time.

The steel fixing will be subcontracted out to a specialist steel fixing company.

Prior to any concrete pour the SRG Civil surveyor will check position of forms, unformed

surface level marks, screed rail levels, concrete cover to unformed surfaces and position of

cast in items. The SRG Civil Engineers will check reinforcing bar size, location and quantity,

concrete cover to formed surfaces, cleanliness and quantity and type of cast in items.

Most concrete pours will be placed by a mobile pump and compacted with concrete

vibrators.

Anchor Fabrication

Cable anchors will be fabricated on-site in propose built fabrication bed which will allow the

strand to be opened up and pass through a grease bath to ensure that all the strand

interstices are completely filled with grease.

The strand is then inserted into HDPE sheath after a plug of grease has been injected into

the sheath for the free length.

Once the strand has filled the free length sheath drop the grease bath from the strand and

continue to push the bond length of the anchor.

Repeat this for the no. of strands required for the cable anchor laying them out on the

fabrication bed.


Page 16 of 86

Clean the individual bond length of each strand and place into the fabrication bed.

Once all the strands have been run start to assembly the anchor as per the fabrication dwg

and prepare for removing to storage bed.

Cable Anchor Hole Drilling

The use of purpose built drilling equipment will be used to drill all cable anchor holes. These

rigs will be operated using hydraulic power packs to align, raise and lower the hammer

tooling in the hole. The hammer will be of the down hole hammer type (DHH) which is

powered by 3 air compressors which produce 1100cfm at 350 psi each.

Air will assist with the removal of drill waste to settlement ponds by way of waste line

which will operate across the dam crest.

Cable Anchor Hole Testing

On completion of drilling the hole to depth as required by the drawings each cable hole will

have to be surveyed, have a video camera lowered down to record concrete condition,

concrete rock interface and condition of rock and tested for water tightness. On completion

of these items the cable hole will be assessed to see if it requires waterproof grouting in

conjunction with WaterNSW before proceeding with the installation of the anchor.

Waterproofing Grouting of Cable Anchor Hole

Upon receiving direction to waterproof grout cable anchor hole set up grout station and

environmental controls prior to grouting.

Lower tremmie pipe to bottom of cable hole, now ready to start mixing grout as per the

requirements in the specification.

Continue grouting to the desired level as per agreement with WaterNSW.

On completion of grouting remove grout gear and set drill rig ready to re-drill hole once

grout is old enough.

Once grout is of sufficient age re-drill hole using similar method to that above.

Anchor Installation

Set up installation frame (Dinosaur) over cable anchor hole which cable anchor is to be

installed into.

Put anchor on trolleys and transport to dam crest.


Page 17 of 86

Align trolleys so anchor can be feed onto Dinosaur, at this stage attach breaking winch to

lifting head of anchor tail end of cable anchor.

Feed cable anchor onto Dinosaur using Dinosaur feeding winch, at some stage weight of

anchor being deed over Dinosaur will be heavier than that not over Dinosaur and rate of

descent will be controlled by the breaking winch.

Continue to install cable anchor until in right position and transfer cable anchor to support

frame to allow grouting of anchor to proceed.

Anchor Grouting

Set up grout station for cable anchor grouting including all environmental controls.

Mix Bond length grout into holding tank carrying out all necessary quality checks prior to

grouting.

Starting grouting of bond length ensuring inner and outer annuli are rising at the same rate

Continue grouting until we get return of water from secondary grout hoses, at this stage

Anchor stressing

Stress cable anchor in stages as per the specification taking into account location and

handling technics for the stressing gear.


Page 18 of 86

8. MANAGEMENT OF CHANGE

The SRG Civil WHS management Plan, Quality Management Plan and CEMP all have

procedures which allow the continual improvement of the processes with the plans.

Where there is a permanent modification of hardware or operational safeguards or

program modification during the construction phase of the project, the risk Register will be

reviewed. This review will be undertaken by those involved in its development and will

indicate whether further action must be taken including review and change of WMSs and

SWMSs.


Page 19 of 86

9. GLOSSARY & ABBREVIATIONS

WMS Work Method Statement

SQE Safety, Quality & Environment

SQERM Acronym used to describe the integrated Safety, Quality &

Environment Risk Management process.

SWMS Safe Work Method statements

Keepit Dam

Risk Register Workplace Risk Register of all risks associated with the project

WHSMP Work Health Safety Management Plan

ITP Inspection and Test Plan

QMP Quality Management Plan

OHS&R Occupational Health, Safety and Rehabilitation

LTIFR Lost Time Injury Frequency Rate

TRIFR Total Recordable Injury Frequency Rate

CEMP Construction Environmental Management Plan

CSSR Construction Safety Study Report

DSMP Dam Safety Management Plan


Page 20 of 86

APPENDIX 1 – Draft Construction Program


Page 21 of 86


Page 22 of 86


Page 23 of 86

APPENDIX 2 – Keepit Dam Risk Register


Page 24 of 86


Page 25 of 86


Page 26 of 86


Page 27 of 86


Page 28 of 86


Page 29 of 86


Page 30 of 86


Page 31 of 86


Page 32 of 86


Page 33 of 86


Page 34 of 86


Page 35 of 86


Page 36 of 86


Page 37 of 86


Page 38 of 86


Page 39 of 86


Page 40 of 86


Page 41 of 86


Page 42 of 86


Page 43 of 86


Page 44 of 86


Page 45 of 86


Page 46 of 86


Page 47 of 86


Page 48 of 86


Page 49 of 86

APPENDIX 3 – Hazardous Materials Register

Below is list of Hazardous Materials which will be used on site and storage as per AS 1940-2004

Item Chemical/Substance Manufacturer/Supplier Application

1 Diesel Lowes Fuel for plant & equipment maximum

at any one time is 8,300 litres in

abunded tank of 10,000 litre capacity

2 Cement Eureka For site manufacture of grout

3 Moly Grease L H S Rock Rod Grease

4 Biodegradable

Hammer Oil

AMC Oil for Down Hole Hammer

5 Epoxy Grout Epirez Grouting of Bearing Plates

6 Masterbrace Epoxy

1446 Part A & B

Masterbrace Grouting of Nose Cones

7 Denso Void Filler #1

& #2

Denso Void filler for manufacture of Anchors


Page 50 of 86

APPENDIX 4 – SRG Policies


Page 51 of 86


Page 52 of 86


Page 53 of 86


Page 54 of 86

APPENDIX 5 – Examples of SRG Procedures


Page 55 of 86


Page 56 of 86


Page 57 of 86


Page 58 of 86


Page 59 of 86


Page 60 of 86


Page 61 of 86


Page 62 of 86

APPENDIX 6 – Checklist Hazardous Industry Planning Advisory Paper No.7

Construction Safety 2011


Page 63 of 86


Page 64 of 86

APPENDIX 7 – Dam Safety Management Plan Final


Page 65 of 86


Page 66 of 86


Page 67 of 86


Page 68 of 86


Page 69 of 86


Page 70 of 86


Page 71 of 86


Page 72 of 86


Page 73 of 86


Page 74 of 86


Page 75 of 86


Page 76 of 86


Page 77 of 86


Page 78 of 86


Page 79 of 86


Page 80 of 86


Page 81 of 86


Page 82 of 86


Page 83 of 86


Page 84 of 86


Page 85 of 86


Page 86 of 86

Date post:	11-Apr-2022
Category:	Documents
Upload:	others
View:	2 times
Download:	0 times

CONSTRUCTION SAFETY STUDY REPORT

Documents