Abaxa 3 Degrees Safety System / Utility Providers Code of Practise for WA/ AS5488: Part 1

Preliminaries – as detailed in the Estimate Specification

  • Risk Assessment, Induction and Medicals (SHEMP/CRAW/SWMS – Hazard and Risk Assessment)
  • Arrange Permits, Site Access, Utility Coordination, Traffic Management, Rail Management.
  • Obtain Approval on Permits/Access and confirm project program/schedule

Pre-Start Activities

  • Site HSE Pre-start / Job Hazard Assessment
  • Work Plan Assessment of Project to Utility Scope for Risk Assessment

Utility Record Search / Assessment – High Risk Survey Assessment – Duty of Care 1-9 – QLD – AS5488

  • Investigate Project Reference Plans – DBYD and other Internal/Hydraulic plans
  • Identify Critical Utilities Permits, Duty of Care / MAD and engineering notification.
  • Confirm all DBYD /Plans and Utility Permits are Valid
  • Overlay DBYD Plans for QLD Engineering Assessment

Site Reconnaissance – High Risk Survey Assessment – Duty of Care 2-9 – QLC – AS5488

  • Conduct Visual Inspection for Utility Indicators to Reference Plans
  • Conduct Feature Survey as per Specification

Detection Utilities – Medium Risk Assessment – Duty of Care 4-9 – QLB – AS5488

  • Open Utility Permits with Utility Provider and review engineering notifications and guidelines
  • Locate utilities using electromagnetic techniques and surface mark the horizontal alignment of utilities detailed in the specification
  • Verify Utilities to the Utility Work Instruction / Duty of Care, estimate specification and within access restrictions
  • Passive Scan site for unplanned metallic utilities in area of excavation activity.

Detection – GPR – Medium Risk Assessment – Duty of Care 4-9 – QLB – AS5488

  • Ground Penetrating Radar utility scan to identify underground assets as detailed within the specification
  • Scan for non-metallic DBYD and unplanned utilities or sub surface indicators

Detection – Concrete Scan – Medium Risk Assessment – QLD – AS5488

  • Ground Penetrating Radar scan to identify metallic and non-metallic targets and concrete characteristics as detailed within the specification

Expose Utilities / Pothole – Medium Risk Assessment – Duty of Care 4-9 – PARTIAL POTHOLE QLA – AS5488

  • Partial Potholing using non-destructive vacuum excavation to expose and record vertical and horizontal measurements of

utilities as detailed within the specification to QLA at each point exposed.

  • Prove Main to Utility Provider Safe Work Instruction – ATCO / APA / Perth Airport – at each extremity of the excavation or as per

Engineering Notification / Requirements.

Expose Utilities / Pothole – Low Risk Assessment – Duty of Care 6-9 – FULL POTHOLE UTILITIES QLA – AS5488

  • Potholing using non-destructive vacuum excavation to expose and record vertical and horizontal measurements

of utilities as detailed within the specification

  • Low risk is assessed when all utilities are exposed within 2 metres of all excavation in the documented clearance area

to Utility Provider Code of Practice for WA

Wet Hire Vacuum

  • Vacuum Technician Operator will only be used for wet hire labour and does not provide advice on any findings or relevance

to underground utilities / services.

Quality Inspection HOLD TEST Point UTILITY LOCTION

  • Inspection of Utility Location List to Final risk assessment to AS5488 and Project Specification
  • Document all non-verifications and points of utility risk to AS5488
  • Document “As Located Sketch Plan” record daily
  • Coordinate with survey where included in estimate specification.

Survey – as detailed in the Estimate Specification

  • Field Utility Survey, including utility alignment and utility data as specified to AS5488 or the standard in the estimate specification.
  • Field Topographical / Feature Survey as per Estimate Specification to reference above ground features as per estimate specification.

High Risk Utility Supervision – Low Risk Assessment – Duty of Care 7-9 SUPERVISION – SAFE EXCAVATION PRACTICE”

  • Location of Infrastructure MUST be PROVEN immediately prior to works to Safe Work Instruction
  • Supervision of Critical Assets as required to Safe Work Instruction AND Utility Notification / Permit with

 engineering approval by utility provider.

  • Approved Locator/Permit Officer must remain in sight of all works at all times to Safe Utility Work Instruction.
  • Approved Locator / Permit Officer must obtain approval at all times any deviation of the Utility Notification / Permit

or Safe Work Instruction

  • Approved Locator / Permit Officer must SUSPEND works being carried out that is in breach of and Safe Work Instruction

and notify Utility Provider immediately.

Risk Assessment – Service Report – Daily

  • Complete Daily Service Report with Risk Assessment to include Project Daily Diary
  • As Located Plan / Permit Management to Utility Provider Duty of Care as per Estimate Specification
  • Client Handover and Signature – Report Issued – Daily as per Estimate Specification
  • Close permit/s and submit permit to Utility Provider / Register Closed Permit where required.

Survey Data Management – Deliverable

  • Preparation of 12D/AUTOCAD DWG and PDF set of survey plans to estimate specification digital data
  • – Soft electronic copy to be provided within 5-10 days of site work completion depending on complexity of project.
  • Provide 3D CAD DWG for Clash Detection and Analysis

Quality Inspection HOLD TEST Point SURVEY

  • Inspection of Survey CAD, Field Report and Project Specification

Project Handover Meeting with Survey DWG and Survey Report, discuss findings and recommendations

Link through to the Abaxa Standard / Industry Code and Australian Standard for further details

Abaxa 3 Degrees Safety System

What is AS5488

Utility Provider Code of Practice for WA 2016

GUIDELINE TO SERVICES – Activities and Inclusions – Limitations

UTILITY LOCATING (QLB)

ACTIVITIES AND INCLUSIONS

• Complete a QLB clearance in the agreed area as outlined in the estimate specification & document references
• Line Locating – Locate Dial Before You Dig (DBYD) utilities such as gas, power, water, sewer and communication cables as indicated on the DBYD plans.
• The utilities are tracked using methods such as Ground Penetrating Radar (GPR) & Electro-Magnetic Induction (EMI).
• Use spray paint on all surfaces to indicate the position & depth of underground utilities at 5m intervals.
• Provide Vertical Accuracy of +/-300mm Horizontally and +/-500mm vertically or as per AS5488 2019 Part 1
• Supply a Service Report (SR) in digital format (pdf) which consists of an “As Located Sketch Plan” and Risk Assessment.
• Perform a site handover with Client to discuss findings and recommendations

LIMITATIONS
Reference Material AS5488:2019 – If Quality Level B Information is compiled using electronic detection; it is only an indication of the existence of subsurface utilities and should not validate the utility subsurface location or attributes. Electronic detection should not be used for obtaining accurate depth information due to the potential for interference from other adjacent services or due to geological conditions. Ground Penetrating Radar has limitations in many ground type and soil conditions, please contact us to discuss your project.

CONCRETE SCANNING (QLB)

ACTIVITIES AND INCLUSIONS
• Review available Utility Records including As Constructed / Hydraulic / DBYD
• Confirm required clearance area / set-out Clearance area with grid template
• Complete scan – Concrete Structure Scanner
• Supply a Service Report (SR) in digital format (pdf) which consists of an “As Located Sketch Plan” and Risk Assessment
• Clearance and site handover with client to discuss findings and recommendations

POTHOLING (QLA)

ACTIVITIES AND INCLUSIONS
• Use appropriate means of exposure – non-destructive vacuum excavation or alternative to expose but protect the integrity of the utility
• Potholes (90mm PVC) will be completed though nonphysical barrier to a depth of 2.0m Below Ground Level (BGL) or the limitation of the vacuum unit based on the ground conditions / Water Table
• Potholes will be placed on the exposed services – providing vertical accuracy +/- 50 mm and appropriate horizontal alignment
• Note some services are protected by a physical hardcover (Slab/ Plastic Cover) – verification will only be to the top of the protective cover
• A pothole (PH) consists of PVC pipe (with protective end caps) with end caps placed on top of the exposed service extending +/-700mm above ground level. Off-sets can be used on some occasions and will be indicated on the pothole.
• Obtain data on the exposed utility to include but not limited to Utility provider, type, size, material & depth
• Supply a Service Report (SR) in digital format (pdf) which consists of an “As Located Sketch Plan” and Risk Assessment
• Reinstate with existing soil of surroundings or soil that was removed – compacted and reinstated as best as possible as per estimate specification and allowances
• Left-over soil / spoils will be left on site – soil will be spread-out neatly
• Extraction / Excavation of contaminated soil – excluded and disposal will not be allowed

LIMITATIONS
Reference Material AS5488:2019 – If Quality Level A may not identify the internal structure or content of the asset. For example, redundant conduits and pipes may be subsequently used by another utility owner for another purpose. Quality Level A may not be achievable in all field situations due to geological conditions or construction methods such as concrete encasing or trenchless technologies.

TRENCHING (QLA)

ACTIVITIES AND INCLUSIONS
• Use appropriate means of exposure – non-destructive vacuum excavation or alternative to expose but protect the integrity of the utility.
• Trenches will be conducted though non-physical barrier by vacuum excavating down to a max depth of 2.0m Below Ground Level (BGL) or the limitation of the vacuum unit (refusal) based on the ground conditions / water table
• Trenches will be a max100-150mm wide only
• Potholes will be place on the exposed services – Providing vertical accuracy +/- 50 mm and appropriate horizontal alignment.
• Note some services are protected by a physical hardcover (Slab/ Plastic Cover) – verification will only be to the top of the protective cover
• A pothole (PH) consists of PVC pipe (with protective end caps) with end caps placed on top of the exposed service extending +/-700mm above ground level. Off-sets can be used on some occasions and will be indicated on the pothole.
• Obtain data on the exposed utility to include but not limited to utility provider, type, size, material & Depth
• Reinstate with existing soil of surroundings or soil that was removed – compacted and reinstated as best as possible as per estimate specification and allowances
• Left-over soil / spoils will be left on site – soil will be spread-out neatly
• Extraction / Excavation of contaminated soil – excluded and disposal will not be allowed

LIMITATIONS
Reference Material AS5488:2019 – If Quality Level A may not identify the internal structure or content of the asset. For example, redundant conduits and pipes may be subsequently used by another utility owner for another purpose. Quality Level A may not be achievable in all field situations due to geological conditions or construction methods such as concrete encasing or trenchless technologies.

POTHOLING / TRENCH PRODUCTION – QLA

PRODUCTION CAPABILITIES GUIDELINES – POTHOLING
Loose Sand = 25 – 30PH per day
Medium Dense Sand = 20 – 25PH per day
Dense Sand = 16 – 20PH per day
High/ Thick Vegetation = 12 – 14PH per day
Clay (Soft, Firm Stiff) = 10 – 12PH per day
Pavers = 10 – 12PH per day
Road/Footpath/Concrete/Bitumen = 8 – 10PH per day

Production Quantities above is based on potholes up to 2.0m Deep, however quantities will vary dependent on of limitation of the vacuum unit in relevant ground condition, Access, Works Flow etc.
Production are based on a standard 10hour (inclusive of Mob/Demob) dayshift working between 6am – 6pm

PRODUCTION CAPABILITIES GUIDELINES – TRENCHING
Loose Sand = 5-8m
Medium Dense Sand = 3-5m
Dense Sand = 1-4m
High/ Thick Vegetation = 1-4m
Clay (Soft, Firm Stiff) = 1-4m
Pavers = 1-5m
Road/Footpath/Concrete/Bitumen = 1-4m

Production Distances above is based on potholes up to 2.0m Deep x 100-150mm Wide; however, distance&/ Depths will vary dependent on of limitation of the vacuum unit in relevant ground condition, Access, Works Flow etc.
Production are based on a standard 10hour (inclusive of Mob/Demob) dayshift working between 6am – 6pm

WET HIRE – VACUUM EXCAVATION

ACTIVITIES AND INCLUSIONS
• Non-destructive vacuum unit WITH qualified Vacuum Technician.
• Vacuum Excavation activities will be conducted though non-physical barrier to the limits of the vacuum unit based on Ground Conditions.
• Trenches will be a max 100-200mm wide only
• Vacuum Technician will only be used for Wet hire labour and does not provide advice on any findings or relevance to underground utilities/ services
• Reinstate with existing soil of surroundings or soil that was removed – compacted and reinstated as best as possible as per estimate specification and allowances
• Left-over soil / spoils will be left on site – soil will be spread-out neatly
• Extraction / Excavation of contaminated soil – excluded and disposal will not be allowed

APA HP SUPERVISON CLASS B – Permit Issue Officer

ACTIVITIES AND INCLUSIONS – PROVING
• Obtain and Review permit to work – relevant safety documentation completed
• Call required authorities to Open Permit / work site
• Carry out atmospheric testing / Gas Testing
• Use ELM / GPR to accurately locate the APA Pipeline
• Pothole APA Pipeline by means of Non-Destructive excavation – After main has been visually identified, 300mm of soil clearance will be held between Pothole (PVC Pipe Bottom) and APA Pipeline
• Call required authorities to complete/ manage permit to close

ACTIVITIES AND INCLUSIONS – SUPERVISION
• Obtain and Review permit to work – relevant safety documentation completed
• Call required authorities to Open Permit / work site
• Carry out atmospheric testing/ Gas Testing
• Provide supervision to all activities within APA Corridor as per Procedure
• Call required authorities to complete and close permit
• Call required authorities to complete/ manage permit to close

PIO B CLASS SUPERVISION – CAPABILITIES
• Request that a Cold Work, Hot Work or Minor Excavation Permit be raised with the Plant Permit Authority / System Controller.
• Carry out atmospheric testing for Hot Work Permits.
• Where applicable, be in charge of a Work Party for Cold Work, Hot Work or Minor Excavation Permits.
• Complete QLA (Pothole) investigation on APA Assets as required
• Complete supervision on minor activities/ excavation works within APA Corridor When endorsed by the APA Team Leader or Region Manager (Permit to Work)

APA HP SUPERVISON CLASS E – Permit Issue Officer

ACTIVITIES AND INCLUSIONS – PROVING
• Obtain and Review permit to work – relevant safety documentation completed
• Call required authorities to Open Permit / work site
• Carry out atmospheric testing/ Gas Testing
• Use ELM / GPR to accurately locate the APA Pipeline
• Pothole APA Pipeline by means of Non-Destructive excavation – After main has been visually identified, 300mm of soil clearance will be held between Pothole (PVC Pipe Bottom) and APA Pipeline
• Call required authorities to complete/ manage permit to close

ACTIVITIES AND INCLUSIONS – SUPERVISION
• Obtain and Review permit to work – relevant safety documentation completed
• Call required authorities to Open Permit / work site
• Carry out atmospheric testing/ Gas Testing
• Provide supervision to all activities within APA Corridor as per Procedure
• Call required authorities to complete and close permit
• Call required authorities to complete/ manage permit to close

PIO E CLASS SUPERVISION – CAPABILITIES
• Be in charge of a Work Party for Excavation work.
• Request that an Excavation Permit be raised with the Plant Permit Authority.
• Complete QLA (Pothole) investigation on APA Assets as required
• Complete supervision on major excavation / drilling works where APA Pipeline is exposed / crossed (drilling) – Works must be endorsed by APA Team Leader or Region Manager prior to commencing (Permit to Work)

ATCO HP SUPERVISION – Approved Locator

ACTIVITIES AND INCLUSIONS – PROVING
• Obtain and Review HP Notification
• Use ELM / GPR to accurately locate the HP Gas Main
• Pothole HP Gas main as per ATCO requirements / Agreed scope – After main has been visually identified, 300mm of soil clearance will be held between Pothole (PVC Pipe Bottom) and HP Main as per ATCO requirements
• Use information from the locate and potholing to complete the HP Notification
• Send completed HP Notification to client and ATCO and manage to a close

ACTIVITIES AND INCLUSIONS – SUPERVISION
• Obtain HP Notification from client and review to ensure compliance
• Use EM / GPR to accurately locate the HP Gas Main as required
• Manage all works within defined proximity to ATCO HP main as per notification Instructions

SURVEY – UTILITY

ACTIVITIES AND INCLUSIONS
• Survey all DBYD Utility Data because of the QLA/QLB site investigation in alignment with agreed scope of works
• Survey pickup to be completed to the nominated Coordinate System
• Survey Coordinates in the form of a DWG. file derived from the latest AutoCAD Civil 3D program.
• Survey Coordinates overlaid onto High Resolution Near map Imagery (see sample for reference) OR
• The option to overlay a feature survey provided by the client (the client document)

SURVEY – FEATURE

ACTIVITIES AND INCLUSIONS
• Survey all site features as per agreed scope
• Survey pickup to be completed to the nominated Coordinate System
• Feature DWG. file derived from the latest AutoCAD Civil 3D program.
• Survey Coordinate from Utility Survey will be overlaid onto the Feature Survey IF it has been included in the agreed scope

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