Construction Quality Assurance Plan Clayton Road Landfill ... · Prepared for: Clayton Road Landfill Joint Venture PO Box 5133 Clayton Vic 3168 Construction Quality Assurance Plan

Prepared for: Clayton Road Landfill Joint Venture PO Box 5133 Clayton Vic 3168

Construction Quality Assurance Plan

Clayton Road Landfill Stage 2

ENSR Australia Pty Ltd (ENSR) 27 October 2008 Document No.: M60049601_CQAP_27Oct08.doc

Use or disclosure of data contained on this sheet is subject to the restriction on the distribution page of this document.

October 2008 Construction Quality Assurance Plan

Commercial in Confidence M60049601_CQAP_27Oct08.doc

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Construction Quality Assurance Plan i October 2008

M60049601_CQAP_27Oct08.doc Commercial in Confidence

CONTENTS

1.0 INTRODUCTION.........................................................................................................................1

1.1 Cell Location and Size.................................................................................................1

1.2 Purpose of the Plan .....................................................................................................1

1.3 Process and Responsibilities.......................................................................................2

2.0 SUBGRADE & GROUNDWATER RELIEF SYSTEM................................................................3

2.1 Construction Quality Assurance Parameters ..............................................................3

2.2 Construction Quality Assurance Performance Indicators............................................4

3.0 COMPACTED CLAY LINER ......................................................................................................5


3.2 Construction Quality Assurance Performance Indicators............................................6

4.0 GEOSYNTHETIC CLAY LINER (GCL) ......................................................................................9


4.2 Construction Quality Assurance Performance Indicators..........................................10

5.0 GEOMEMBRANE LINER .........................................................................................................11

5.1 Construction Quality Assurance Parameters ............................................................11


6.0 CUSHION GEOTEXTILE..........................................................................................................15



7.0 LEACHATE COLLECTION SYSTEM ......................................................................................17



8.0 AUDITOR VERIFICATION .......................................................................................................19

8.1 Milestone and Hold Points.........................................................................................19


October 2008 ii Construction Quality Assurance Plan


TABLES

Body Report

Table 1: CQA Parameters - Subgrade & Groundwater Relief System ......................................... 3 Table 2: Performance Indicators - Subgrade & Groundwater Relief System................................ 4 Table 3: Quality Assurance Parameters – Compacted Clay Liner................................................ 5 Table 4: QA Performance Indicators – Compacted Clay Liner ..................................................... 6 Table 5: CQA Parameters - GCL .................................................................................................. 9 Table 6: CQA Performance Indicators - GCL.............................................................................. 10 Table 7: Construction Quality Assurance Parameters – Geomembrane Liner ........................... 11 Table 8: CQA Performance Indicators – Geomembrane Liner ................................................... 12 Table 9: CQA Parameters –Cushion Geotextile ......................................................................... 15 Table 10: CQA Performance Indicators – Cushion Geotextile.................................................... 16 Table 11: CQA Parameters – Leachate Collection System ........................................................ 17 Table 12: CQA Performance Indicators – Leachate Collection System ..................................... 18 Table 13: Milestones & Hold Points ............................................................................................ 19

FIGURE Figure 1: Site Location Plan

Appendices Appendix A: Corrective Action Request


Construction Quality Assurance Plan 1 October 2008

M60049601_CQAP_27Oct08.Doc Commercial in Confidence

1.0 Introduction

1.1 Cell Location and Size This Construction Quality Assurance Plan (CQAP) has been prepared for the design and construction of Stage 2 at Clayton Road Landfill Joint Ventures (CRLJV) Clayton Road Landfill, Clayton South, Victoria (the Site) and has been developed in accordance with Environment Protection Authority Victoria (EPA) Best Practice Environmental Management Guidelines for Siting, Design, Operation and Rehabilitation of Landfills (BPEM).

The Site is located at crown allotment 654 Clayton Road, Clayton South, Victoria. The Geographical Information System (GIS) coordinate of the Site centroid in longitude and latitude (decimal degrees) coordinates in the 1994 Geocentric Datum of Australia (GDA94) is 145.116735 and 37.953165 respectively.

Stage 2 is located towards the south eastern corner of the Site and is bound by Deals Road to the east, the existing Stage 1 and current landfilling area to the west, the existing completed landfill area to the north and the Site boundary to the south.

The base footprint of the new Stage 2 is approximately 1.3 ha. The cell will provide the CRLJV with approximately 1,000,000 m3 of airspace when combined with the remaining Stage 1 filling area.

Refer to Figure 1 for the Site Location Plan.

This CQA Plan provides details of typical construction requirements that should be undertaken during the construction of Clayton Road Landfill, Stage 2 and shall be used in conjunction with the construction Drawings and Technical Specification dated August 2008. Should there be any discrepancy between the documents, ENSR shall be notified immediately for clarification, prior to works on the disputed item commencing.

1.2 Purpose of the Plan The purpose of this CQA Plan is to detail the testing methods and frequencies and quality assurance (QA) procedures to construct the following Clayton Road Landfill, Stage 2 works:

• Subgrade;

• Compacted Clay Cell Liner;

• Geomembrane Liner(s), and

• Leachate Collection System.

This plan shall be used in conjunction with the Technical Specification (the Specification) and the Drawings for the works and shall be primarily used to assist the Environmental Auditor with their construction verification process during cell construction. It is noted that further detailed and specific construction procedures and requirements are outlined in the Specification and the Drawings. This document does not replace the Specification or Drawings.

This CQA Plan details milestone and hold points which have been marked as in the construction quality assurance parameter tables. Auditor inspections or document review and subsequent approvals for these items will be required prior to commencing with the next stage of construction. Marked items are minimum requirements only, and additional inspections during the construction phase may be required at the Auditor’s discretion.


October 2008 2 Construction Quality Assurance Plan

Commercial in Confidence M60049601_CQAP_27Oct08.Doc

1.3 Process and Responsibilities The following tables within this CQA Plan provide a typical indication of various stages throughout the cell construction phase. Additional works not noted in this CQA Plan may be required during the construction phase and will be subject to the requirements of the environmental audit process. The Contractor shall make no claim for variations relating to works required to construct the cell that are not listed within this CQA Plan. It is the responsibility of the Contractor to construct the cell to a standard in strict accordance with the Specification and the Drawings suitable of obtaining approval from the environmental Auditor and the EPA.

An ENSR representative will be responsible for engineering inspections as required during the cell construction phase. Tasks that require engineering involvement have been denoted as ‘ENSR’ in the following CQA parameter tables.

A suitably qualified Geotechnical Testing Authority (GTA), who is independent of the Contractor, has been appointed by the Principal to provide Level 1 Supervision for the works as outlined in the Specification. Tasks that require verification by the GTA have been denoted as ‘Level 1 – GTA’ in the following CQA parameter tables.

A suitably qualified Consultant, who is independent of the Contractor, has been appointed by the Principal to provide Third Party Construction Quality Assurance for the geosynthetic liner works as outlined in the Specification. Tasks that require verification by the Consultant have been denoted as ‘TPCC’ in the following CQA parameter tables.

An EPA accredited Environmental Auditor will inspect and verify the cell construction, including but not limited to the milestone points identified within this CQA Plan. Typically these points include the completion of the subgrade; testing of the clay materials; inspection of the compacted clay liner and geosynthetic liners; and the completion of the leachate collection system. Where hold points are nominated, the approval to commence each stage will need to be provided by the Auditor before the subsequent stage may be developed. The stages subject to Auditor involvement have been denoted as ‘Auditor’ in the CQA parameter tables. It is noted that additional Site inspection or requests for information may be completed by the Auditor at their discretion throughout the construction phase.

Where deemed necessary by the Auditor, the corrective action request (CAR) form may be used to track any non conformances during construction and the rectification procedures undertaken during construction. A copy of an example CAR form that may be adopted has been provided in Appendix A.




2.0 Subgrade & Groundwater Relief System

2.1 Construction Quality Assurance Parameters The following parameters shall be checked to ensure that the subgrade and groundwater relief system have been constructed to meet the requirements of the Specification and Drawings.

Table 1: CQA Parameters - Subgrade & Groundwater Relief System

Item Parameter Frequency Responsibility

1. Inspection of groundwater relief trench and grid alignment.

Prior to and during installation of groundwater relief system.

Contractor

Auditor

ENSR

2. Inspection of groundwater relief system construction.

During installation of groundwater relief system.

Contractor

ENSR

3. Inspection of groundwater extraction and collection sump construction.

During installation of groundwater sumps.

Contractor

Auditor

ENSR

4. Inspection of subgrade surface for soft spots and for shape and grading of surface.

Prior to installation of compacted clay liner.

ENSR Contractor

5. Inspection of groundwater sump location and construction.

Prior to and during installation of groundwater sump.

Contractor ENSR Auditor

6. Survey of top of subgrade and groundwater relief system by licenced surveyor.

Prior to installation of compacted clay liner. Contractor

7. Review of survey information. Prior to installation of compacted clay liner.

Auditor Contractor




2.2 Construction Quality Assurance Performance Indicators The following parameters shall be used as a guide to assist in confirming that the above parameters have been achieved during the construction of the subgrade and groundwater relief system.

Table 2: Performance Indicators - Subgrade & Groundwater Relief System

Item Parameter Performance Indicator

1. Inspection of groundwater relief trench and grid alignment. Typical grid spacing of 20 m x 20 m.

2. Inspection of groundwater relief system construction.

Anchor trenches constructed to a minimum depth of 500 mm and lined with geotextile fabric.

Anchor trenches have slotted pipe and aggregate installed prior to covering.

3. Inspection of groundwater extraction and collection sump construction.

Groundwater extraction sump has been constructed to necessary levels and extraction riser pipe and pump has been installed and observed to be operational and extracting groundwater from the sump. Groundwater collection sump has been installed within the footprint of the leachate sump as specified and is draining into the extraction sump.

4. Inspection of subgrade surface for soft spots and for shape and grading of surface.

Firm surface with no significant rutting or heaving. Grade over the surface is typically consistent.

5. Inspection of groundwater sump location and construction.

Excavation and depths as per specified requirements, lined with geotextile fabric, filled with aggregate and extraction pipeline.

6. Survey of top of subgrade and groundwater relief system by licenced surveyor.

Survey picked up at an approximate grid pattern of 10 m.

7. Review of survey information. Review of grades and levels.




3.0 Compacted Clay Liner

3.1 Construction Quality Assurance Parameters The following parameters shall be checked to ensure that the compacted clay liner has been constructed to meet the requirements of the Specification and Drawings.

Table 3: Quality Assurance Parameters – Compacted Clay Liner


1. Testing of proposed clay liner material for compliance with the specified requirements.

Prior to use within cell & typically prior to its arrival on Site.

Contractor Level 1 – GTA

Auditor

2.

Distribution of clay liner material to ensure clods are broken up and material is free of lenses and is consistent in nature with other material within the immediate surrounding area.

During clay liner installation. Level 1 - GTA

3. Material being placed is of sufficient moisture content to meet the specified requirements.

During clay liner installation. Level 1 – GTA

4.

Material is being compacted with approved compaction equipment and each layer thickness does not exceed 250 mm nominal compacted thickness.


5. Material being placed is being compacted to meet the specified density requirements.


6.

Prior to the installation of a subsequent lift the previous layer has been sufficiently scarified and there are no laminations between layers of clay liner.


7. In-Situ compacted clay liner has been installed to achieve the specified maximum permeability requirements.


8. Where applicable, the new compacted clay liner has been keyed in to an adjacent existing clay liner.


9. Finished clay liner surface is smooth with no significant cracking.

Upon completion of clay liner works.

Level 1 – GTA Auditor





10. Survey of top of clay liner by licenced surveyor.

Upon completion of clay liner works.

Contractor

11. Review of survey information. Prior to installation of compacted clay liner.

Auditor Contractor

3.2 Construction Quality Assurance Performance Indicators The following parameters shall be used as a guide to assist in confirming that the above parameters have been achieved during the construction of the compacted clay liner.

Table 4: QA Performance Indicators – Compacted Clay Liner


1. Testing of proposed clay liner material for compliance with the specified requirements.

Test results confirm minimum requirements of the Technical Specification.

2.

Distribution of clay liner material ensuring that clods are broken up and material is free of lenses and is consistent in nature with other material within the immediate surrounding area.

Clod sizes are typically less than the compacted layer thickness, i.e. 250 mm.

3. Material being placed is of sufficient moisture content to meet the specified requirements.

Where material does not appear to be of sufficient moisture content, conditioning is being conducted to increase or decrease the moisture content. Moisture contents determined during density testing to confirm compliance with specified requirements.

4. Material is being compacted with approved compaction equipment and each layer thickness does not exceed 250 mm nominal compacted thickness.

Visual inspection during installation by Level 1 GTA.

5. Material being placed is being compacted to meet the specified density requirements.

Density testing conducted at the specified minimum frequencies to confirm compliance with specified requirements.

6. Prior to the installation of a subsequent lift, the previous layer has been sufficiently scarified and there are no laminations between layers of clay liner.

Visual inspection during installation by Level 1 GTA. Finished layer surface to be broken up with compactors or excavators prior to new lift placement.

7. In situ compacted clay liner has been installed to achieve the specified maximum permeability requirements.

In situ testing by Level 1 GTA at the specified minimum frequencies to confirm compliance with specified requirements.





8. Where applicable the new compacted clay liner has been keyed in to an adjacent existing clay liner.

Existing moist clay liner has been exposed. Each layer has been benched into the existing liner in 250 mm steps during layer placement. A total key in thickness of 1m shall have been achieved.

9. Finished clay liner surface is smooth with no significant cracking.

Visual inspection during installation by Level 1 GTA. Moisture content of the surface is keep within acceptable limits to prevent cracking.

10. Survey of top of clay liner and clay liner thickness by licenced surveyor.


11. Review of survey information. Review of grades, levels and thickness to confirm a minimum of 1 m has been achieved.








4.0 Geosynthetic Clay Liner (GCL)

4.1 Construction Quality Assurance Parameters The following parameters shall be checked to ensure that the GCL has been installed to meet the requirements of the Specification and Drawings.

Table 5: CQA Parameters - GCL

Item Parameter Frequency Responsibility 1. Submission of manufactures QA

documentation. Prior to lining works commencing and as per Technical Specification.

TPCC/Auditor Contractor

2. Inspection and identification of GCL material surface for defects or damage.

During and after installation, entire placed surface to be inspected.

TPCC.

3. Recording of panel number, location, size, type and date of installation in log book and as built drawing during installation.

All panels. TPCC.

4. Inspection of panel overlap to meet the specified requirements and be generally in a roof tile alignment.

All panels. TPCC.

5. All defects and damage to the GCL shall be repaired as per the specified requirements. Each repair number shall be recorded.

All defects. TPCC.

6. All GCL shall be installed without hydration and only during specified weather conditions.

All panels. TPCC.

7. The liner material shall be secured in anchor trenches.

In all areas indicated on the drawings.

TPCC. Contractor




4.2 Construction Quality Assurance Performance Indicators The following parameters shall be used as a guide to assist in confirming that the above parameters have been achieved during the installation of the GCL.

Table 6: CQA Performance Indicators - GCL

Item Parameter Performance Indicator 1. Submission of manufacturer’s QA

documentation. Review all data to confirm compliance with all items listed in the Technical Specification.

2. Inspection and identification of GCL material surface for defects or damage.

Visual inspection to confirm no tears, punctures, holes or other faults in the material.


To be marked on each panel and recorded in log book or other method prior to covering.


300 mm overlap achieved and panels are overlapped such as roof tiles.

5. All defects and damage to the GCL shall be repaired as per the specified requirements. Each repair number shall be recorded.

Visual inspection confirming patching or panel replacement, bentonite paste was used to seal the patch to the underlying panel as per the specified requirements.

6. All GCL shall be installed without hydration and only during specified weather conditions.

Visual inspection during installation, no rain etc, all placed GCL panels covered with HDPE panels before the end of each day.


Liner material extends into the trench and along the base.




5.0 Geomembrane Liner

5.1 Construction Quality Assurance Parameters The following parameters shall be checked to ensure that the geomembrane liner has been installed to meet the requirements of the Specification and Drawings.

Table 7: Construction Quality Assurance Parameters – Geomembrane Liner

Item Parameter Frequency Responsibility 1. Submission of manufacturer’s QA



2. Inspection of finished clay surface to be lined.

Prior to installation works commencing.

Auditor TPCC. Contractor

3. Inspection and identification of HDPE material surface for defects or damage.


TPCC.


All panels. TPCC.


All panels. TPCC.

6. Test welds conducted by each welder prior to welding works.

Prior to commencement of the shifts welding works and every 5 hours thereafter.

TPCC.

7. Panels shall be welded to adjacent panels, and seam number, date and time, welder’s name, welding apparatus number and temperature shall be recorded.

All welds. TPCC.

8. All defects and damage to the liner shall be repaired. Each repair number and details as per panels and seams shall be recorded

All defects/damage. TPCC.

9. Non destructive testing of primary and secondary welds to be verified and recorded.

All welds. TPCC.

10. Destructive testing to be undertaken on primary welds to be verified, recorded and independently tested.

One sample per 200 m of primary weld completed.

TPCC.




Item Parameter Frequency Responsibility 11. The liner material shall be

secured in anchor trenches. In all areas indicated on the drawings.

TPCC. Contractor

5.2 Construction Quality Assurance Performance Indicators The following parameters shall be used as a guide to assist in confirming that the above parameters have been achieved during the installation of the geomembrane liner.

Table 8: CQA Performance Indicators – Geomembrane Liner

Item Parameter Performance Indicator 1. Submission of manufacturer’s quality

assurance documentation. Review all data to confirm compliance with all items listed in the Specification.

2. Inspection of finished clay surface to be lined.

Surface free of rocks, stones and other loose material that may damage the HDPE liner.

3. Inspection and identification of HDPE material surface for defects or damage.

Visual inspection to confirm no tears, punctures, abrasions, indentations, cracks, thin spots or other faults in the material.


To be marked on each panel and recorded in log book or other method prior to covering.


125 mm overlap achieved and panels are overlapped such as roof tiles.

6. Test welds conducted by each welder prior to welding works.

Results of test welds must meet the requirements of the Technical Specification prior to commencing welding.

7. Panels shall be welded to adjacent panels, and seam number, date and time, welder’s name, welding apparatus number and temperature shall be recorded.

Visual inspection and welds to be marked near each seam and recorded in log book or other method prior to covering.

8. All defects and damage to the liner shall be repaired. Each repair number and details as per panels and seams shall be recorded.

Any defects/damage shall be marked for repair or patched immediately. Patch numbers etc to be marked on or near the patch and recorded in log book or other method prior to covering.

9. Non destructive testing of primary and secondary welds to be verified and recorded.

Testing shall be undertaken until it is verified that the welds confirm with the specified requirements. All results shall be marked near the weld and recorded in the log book prior to covering.




Item Parameter Performance Indicator 10. Destructive testing to be undertaken on

primary welds to be verified, recorded and independently tested.

Testing results shall confirm compliance with the specified requirements. Each test to be individually marked and recorded.










6.0 Cushion Geotextile

6.1 Construction Quality Assurance Parameters The following parameters shall be checked to ensure that the cushion geotextile has been installed to meet the requirements of the Specification and Drawings.

Table 9: CQA Parameters –Cushion Geotextile

Item Parameter Frequency Responsibility 1. Submission of manufacturer’s QA



2. Inspection and identification of geotextile cushion material surface for defects or damage.


TPCC.


All panels. TPCC.

4. All defects and damage to the geotextile cushion shall be repaired as per the specified requirements. Each repair number shall be recorded.

All defects. TPCC.

5. All panels joined to adjacent panels using thermal heat bonding and in accordance with the specified requirements.

All panels/joins. TPCC.

6. The completed joins to be inspected to identify any burn outs from the thermal bonding process.

All joins. TPCC.

7. The cushion material shall be secured in anchor trenches.

In all areas indicated on the drawings.

TPCC Contractor

8. The anchor trenches are backfilled and compacted using clay liner material to secure all liner material.

In all constructed trenches. TPCC. Contractor




6.2 Construction Quality Assurance Performance Indicators The following parameters shall be used as a guide to assist in confirming that the above parameters have been achieved during the installation of the cushion geotextile.

Table 10: CQA Performance Indicators – Cushion Geotextile

Item Parameter Performance Indicator 1. Submission of manufacturer’s QA

documentation. Review all data to confirm compliance with all items listed in the Technical Specification.

2. Inspection and identification of geotextile cushion material surface for defects or damage.

Visual inspection to confirm no tears, punctures, holes or other faults in the material.


100 mm overlap achieved and panels are overlapped in the direction of flow, i.e. roof tile method.

4. All defects and damage to the geotextile cushion shall be repaired as per the specified requirements. Each repair number shall be recorded.

Visual inspection confirming patching or panel replacement as per the specified requirements.

5. All panels joined to adjacent panels using thermal heat bonding and in accordance with the specified requirements.

Joins have been fused together along the full length.

6. The completed joins to be inspected to identify any burn outs from the thermal bonding process.

Burn out holes that go through both layers of cushion along the join shall be patched as per the specified requirements.

7. The cushion material shall be secured in anchor trenches.


8. The anchor trenches are backfilled and compacted using clay liner material to secure all liner material.

Trenches are completely full of recompacted clay liner material.




7.0 Leachate Collection System

7.1 Construction Quality Assurance Parameters The following parameters shall be checked to ensure that the leachate collection system has been constructed to meet the requirements of the Specification and Drawings.

Table 11: CQA Parameters – Leachate Collection System

Item Parameter Frequency Responsibility 1. Inspection of pipe type and size. All pipes. Contractor

ENSR

2. Inspection of leachate collection and header leachate collection alignment and spacing.

During installation and prior to connecting.

Contractor ENSR

3. Inspection of leachate collection and header leachate collection pipe drilling pattern.

All pipes. Contractor ENSR

4. Inspection of all leachate sump extraction pipe work and drilling pattern.

During installation. Contractor ENSR

5. Inspection of pipe welding and jointing.

During installation. Contractor ENSR

6. Survey of leachate pipe alignment by licensed surveyor

Prior to aggregate installation. Contractor

7. Inspection of leachate drainage blanket aggregate.

Upon delivery aggregate and prior to installation.

Contractor ENSR

8. Inspection of leachate drainage blanket construction including aggregate placement and geotextile filter fabric installation.

During installation. Contractor Auditor

ENSR

9. Inspection of side wall leachate drainage system construction.

During installation, prior to placement of waste against side walls.

Contractor ENSR

Auditor

10. Survey of top of rock and rock thickness by licensed surveyor.


Contractor

11. Review of survey information. Review of grades, levels and thickness to confirm a minimum of 300 mm has been achieved.

Auditor Contractor ENSR




7.2 Construction Quality Assurance Performance Indicators The following parameters shall be used as a guide to assist in confirming that the above parameters have been achieved during the construction of the leachate collection system.

Table 12: CQA Performance Indicators – Leachate Collection System

Item Parameter Performance Indicator 1. Inspection of pipe type and size. All leachate pipes to be HDPE pipe and

in accordance with the sizes outlined in the Specification and Drawings.

2. Inspection of leachate collection and header leachate collection alignment and spacing.

25 m maximum offset between 110 dia leachate collection (LC) pipe lines, 160 dia header leachate collection liner located for drainage into sump.

3. Inspection of leachate collection and header leachate collection pipe drilling pattern.

Pipes have been drilled in accordance with the drawings and are clean, free of drill fragments, mud and dirt.

4. Inspection of all leachate sump extraction pipe work and drilling pattern.

Extraction pipes (600 mm) installed within leachate sump and drilled to the specified requirements.

5. Inspection of pipe welding and jointing. Pipes to be connected via extrusion welding, butt welding or electrofusion to the specified requirements.

6. Survey of leachate pipe alignment by licensed surveyor.

Review of survey information shows pipe alignments as per the requirements of the Specification and Drawings.

7. Inspection of leachate drainage blanket aggregate.

Grading data of material shall confirm compliance with the requirements of the Specification.

8. Inspection of leachate drainage blanket construction.

Only approved equipment being used to construct the blanket and requirements of Specification are being met. Aggregate not thinner than 300 mm over the floor and bridging layer being implemented for truck traffic. Geotextile filter fabric has been installed over the full finished surface of the top of the leachate drainage aggregate.

9. Inspection of side wall leachate drainage system construction.

Approved drainage material installed to 200 mm thickness (minimum) over side walls prior to waste placement on walls. First layer of drainage material to be installed to a minimum vertical height of 2.5 m on all side walls. Remaining drainage layers to be installed during operations and shall be maintained at a minimum 500 mm height above the level of waste lift.

10. Survey of top of rock and rock thickness by licensed surveyor.





Item Parameter Performance Indicator 11. Review of survey information. Review of grades, levels and thickness to

confirm a minimum of 300 mm has been achieved.

8.0 Auditor Verification

To satisfy the EPA that the performance objectives of the CQA Plan have been achieved, the GTA and TPCC will provide the ENSR with their respective reports and ENSR will provide the EPA accredited Auditor with a construction verification report to outline the cell construction.

Once the Auditor is satisfied that the cell has been constructed appropriately, the Auditor will provide a construction audit report to verify that the works have been undertaken in accordance with the EPA approved design documents.

8.1 Milestone and Hold Points To ensure key components in the cell construction are progressively approved, the CQA Plan details milestone and hold points which have been marked as in the construction quality assurance parameter tables. Auditor approval will be obtained at each milestone / hold point prior to commencing with the next stage of construction. These milestones include:

Table 13: Milestones & Hold Points

Item Key Elements 1 – Subgrade Even sub-base surface with no significant movement.

2 – Groundwater Relief System Physical drainage infrastructure, no significant surface groundwater seeps or pooling.

3 – Clay Liner Materials Material properties satisfy specifications.

4 – Clay Liner Construction Physical works, construction techniques, testing procedures, works supervision, geotechnical testing.

5 – Side Wall Construction Physical works, construction techniques, testing procedures, works supervision, geotechnical testing.

6 – Geosynthetic Liner System Material properties satisfy specifications, liner installation and welding satisfy the Specification.

7 – Leachate Collection System Drainage material specifications, collection pipes properties and pipe spacing.






Construction Quality Assurance Plan October 2008


Figure












Appendix A: Corrective Action Request








Appendix A – EXAMPLE CORRECTIVE ACTION REQUEST FORM Description Of

The Issue Specific Problem Identified

Remedial Measure

Proposed

Remedial Measure

Performance

Confirmation Of Success Of

Remedial Measure

E.g. Density testing of liner

E.g. Density targe not achieved

E.g. re-compact area

E.g. Area rolled with 6 passes of vibrating sheep’s foot roller

E.g. Area retested and required density achieved

Signature:

Signature: Signature:

Date:

Date: Date




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Construction Quality Assurance Plan Clayton Road Landfill ... · Prepared for: Clayton Road Landfill Joint Venture PO Box 5133 Clayton Vic 3168 Construction Quality Assurance Plan