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Spoil and Contaminated Materials Management Sub-Plan

for `Design & Construction of Port Botany Expansion' of Sydney Ports Corporation

Document No: PLAN-EN-020[1W]

PLAN-EN-020 [1W] Spoil & Contaminated Materials Mgmt Sub-Plan.doc

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Table of Contents

1 2 3 4 5 6 7 8 9 10 GOALS, OUTCOMES, KEY ISSUES............................................................................3 MCOA REQUIREMENTS ..............................................................................................6 EIS REQUIREMENTS ...................................................................................................6 DEED AND PSTR REQUIREMENTS............................................................................7 MITIGATION MEASURES ............................................................................................8 MONITORING ...............................................................................................................9 TRAINING AND RESOURCES ...................................................................................10 CONSULTATION AND CONTACTS...........................................................................11 REFERENCES AND REVISIONS ...............................................................................12 INCIDENT PLANNING AND RESPONSE ..................................................................13 LOCATION OF CONTAMINATED SEDIMENTS ....................................14



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The purpose of this plan is to address contamination issues during construction by providing general procedures for the disposal and management of any contaminated materials. It is intended to inform construction supervisors, engineers and foremen of procedures for dealing with contaminated materials. Activity-specific work method statements are developed prior to works being undertaken for the project in various zones and sites. These method statements prevent and/or minimise potential adverse environmental impacts of identified and unanticipated contaminated materials. This Sub-Plan is intended to be a dynamic working document and have the flexibility to incorporate change as the extent of any contaminated material disturbed by construction activity becomes known. This Sub-Plan has been prepared to: Identify locations of sediment contamination that may be disturbed during construction; Develop appropriate measures to mitigate potential adverse impacts; and Provide on site personnel with sufficient guidance when contaminated spoil or soil is encountered. The issue of Acid Sulphate Soils is not covered under this plan--but is addressed in the Acid Sulphate Soils Management Sub-Plan (PLAN-EN-005).


Contaminated materials encountered are managed in accordance with all statutory and project-specific requirements. Reuse all dredged spoil on site--no dredged spoil to be taken off-site.


No water pollution over background levels from contaminated sediment, as indicated by water quality monitoring. Any soil that cannot be re-used on site disposed of appropriately according to DECC waste classification guidelines.

Key Issues

Site investigations by SPC indicate that low levels of contamination are present in sediments within the dredge area and Penrhyn Estuary. The EIS and subsequent site investigations concluded that contaminant concentrations are sufficiently low that encapsulation within the reclamation area is a suitable management action for dredged spoil. Location and Type of Contamination Appendix 1 indicates the locations of all boreholes developed as part of site investigations prior to the commencement of works. Locations where sediment contamination exceeds the Interim Sediment Quality Guidelines (ISQG)-Low trigger value (ANZECC, 2000) are marked in red. Locations where no sediment contamination was found are marked in green. The site investigations used to determine the location of contaminant exceedances includes: data derived from the EIS document prepared by URS in 2003; data derived from the Geotechnical and Sediment Quality Investigation documents prepared by Douglas Partners in December 2006; data derived from the supplementary 2007 site investigations by Douglas Partners; and data derived from 2008 site investigations by Golder Associates along Foreshore Road and in Sir Joseph Banks Park. The spatial spread of the contaminants exhibits no discernable pattern or associated source, with contaminant exceedances present in most locations across the proposed expansion area and within Penrhyn Estuary. Similarly, the depth of the contaminant exceedances within these areas varies from the surface to depths of up to 20.0m. This notwithstanding, the majority of identified contamination is located at depths less than one metre.

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Site investigations were undertaken by Golder Associates in May 2008 to investigate the utilities route along the south side of Foreshore Road, and in August 2008 through Sir Joseph Banks Park. These areas were tested for a range of potential contaminants including VOC, BTEX and TPH as well as sulphates, chlorides, pH. None of these were found at levels that would indicate contamination, and it was concluded that any excess soil could be reused on-site. Known Contaminants Based on the results presented in the above mentioned site investigations, the following are identified contaminants of concern in sediments: Inorganics ­ Arsenic, Cadmium, Chromium, Copper, Mercury; and Organics ­ Endrin, Benzo(a)pyrene, Total PAH, Tributyltin (TBT). Note that B(a)P and Total PAH were only identified to exceed the ISQG-Low in one duplicate sample, but not within its associated primary sample. Concentrations of these contaminants only marginally exceed the ISQG-Lower values (trigger values), are typically less than the ISQG-High values. This is true for all samples excluding Arsenic at 1324A and Mercury at E30 which are above the ISQG-High values. Locations of Contaminant Disturbance As the identified contaminants do not appear to be clustered within a single hotspot, there is potential for disturbance of contaminants during dredging works, based on the location and vertical extent of dredging activities. As most of the contaminant exceedances are located at depths less than one metre, disturbance is considered likely. Those contaminants located at depths greater than the proposed vertical extent of dredging exhibit a reduced potential for disturbance. Based on the dredging design: Dredging of the Tug Channel to depths of 1.0m to 7.0m has the potential to disturb: Cadmium contamination at 0.5m depth, and chromium contamination at 1.0m depth, at sampling location E19; Dredging of the Tug Manoeuvring Channel to depths of 8.0m has the potential to disturb: Endrin contamination at 0.0m depth at sampling location 1301, and Mercury contamination at 0.0 to 0.5m depth at sampling location E5; Dredging of E1 to depths of 15.5m has the potential to disturb the: Copper contamination at 0.0m depth at sampling location D2, and Mercury contamination at 0.0 to 0.5m depth at sampling location D1; Dredging of the Berthing Basin to depths of 16.5m, and trenching to a depth of 30.0m (or rock), has the potential to disturb the: Arsenic contamination at 4.5m depth at sampling location 1312A, Mercury contamination at 0.0-0.5m depth, and arsenic contamination at 20.0m depth, at sampling location R11, Mercury contamination at 0.0-0.4m depth at sampling location S8, Mercury contamination at 0.0-0.2m depth at sampling location S10, Mercury contamination at 0.0-0.2m depth at sampling location S12, and Arsenic contamination at 18.7m depth at sampling location 1307A; Dredging of the New Commercial Navigation Channel to depths of 16.5m has the potential to disturb the: Mercury contamination at 0.0-0.4m depth at sampling location S5,

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Mercury contamination at 0.0-0.45m depth at sampling location S7, Mercury contamination at 0.0-0.35m depth at sampling location S9, and Mercury contamination at 0.0-0.35m depth at sampling location S11. Based on the dredging and reclamation design, locations where contaminants exceed the ISQG-High values will be not be disturbed, as these areas will be filled as part of the Public Boat Ramp works (1324A) or inter-tidal habitat zone (E29, E30, E31). It does not appear that the remainder of the identified contamination, such as that at CP05, will be disturbed as a result of dredging works. Management Strategies Strategies to manage contamination are, in order of priority: deposit dredged spoil within the reclamation area, including areas identified as containing low levels of contaminated sediment; and avoid disturbance of contaminants in Penrhyn Estuary, using clean on-site materials to cover existing contaminated sediments in the creation of the inter-tidal zone, and undertaking habitat enhancement works. Limited further sampling and analysis may be required at some locations to more accurately characterise areas of contamination and any appropriate handling and disposal techniques required. Statutory Requirements Contaminated Land Management Act 1997 (NSW) Where contaminated material is found, storage and disposal procedures are to comply with the Contaminated Land Management Act 1997. Protection of the Environment Operations Act 1997 (NSW) Section 120 requires that activities must not cause water pollution; Section 148 states DECC must be notified in the event of actual or threatening material harm to the environment. Environmental Refer to CFEMP Appendix 5. Aspects & Impacts Licence & Permit Requirements No licence or permits are required.

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Original Ref. B2.12 Relevant Requirement Dredging operations may not commence until a sediment sampling study has been undertaken in accordance with the Australian and New Zealand Guidelines for Fresh and Marine Water Quality (2000) and CSIRO's Handbook for Sediment Quality Assessment, and any subsequent recommendations for the management of the sediment during construction are adopted. Reference SPC completed this study. Recommendations are included in estuary and inter-tidal habitat design and construction methods. CM4



Dredged spoil shall not be disposed of outside the construction area in Botany Bay, or in other NSW state waters. For the purpose of this condition, the construction area shall be those area identified as "area to be dredged" and "area to be reclaimed", as generally outlined in Figure 8.4 of the document referred to under condition A1.1b.





Original Ref. Chapter 18.3.4 Paragraph 5 Relevant Requirement The proposed habitat enhancement for shorebirds would involve disturbance to the sand dunes within Penrhyn Estuary. However, the sand in these dunes is above mean high water mark and is at low risk of containing contaminated sediment. Sand from the dunes may be spread over the top of areas with existing contamination, capping and causing little disturbance to any contaminated sediment which may be located beneath. It is expected that some dredged material consisting of fine marine silt and mud would be selected during dredging operations for creation of ecological habitat in Penrhyn Estuary. This material may have to be temporarily stockpiled prior to being spread over the intertidal flats to be created as part of the Penrhyn Estuary habitat enhancement works. The precise quantities of this material would depend on the volume of this material available in the dredged area and the required volume for habitat enhancement purposes. It is not intended to dispose of any dredged material offsite. Excavated soil generated during site preparation activities would be stockpiled for reuse in landscaping activities surrounding the new terminal area. Any soil which cannot be disposed of in this manner would be transported offsite to a licensed landfill, after appropriate classification of the material is carried out in accordance with the EPA's Environmental Guidelines: Assessment, Classification & Management of Liquid & Non-Liquid Wastes (1999). Limit disturbance of contaminated sediment in Penrhyn Estuary. Erosion control measures would be implemented to control dispersion of sediment in disturbed areas. Some contaminated sediments would be capped with clean material. Any offsite material used in the reclamation would be Virgin Excavated Natural Material (VENM) or "clean fill". Reference CM3


Chapter 34.4.1 Paragraph 5

Section 1


Chapter 34.4.1 Paragraph 7



EIS Ch 37, 37.2, Ch18; 18.5.1 COI Primary Submission 6.4.1 COI Primary Submission 6.4.1

CM3, Soil & Water Management Sub-Plan CM7



Prior to use of any dredged material in Penrhyn Estuary appropriate testing would be undertaken to determine that the material is not contaminated and is ecologically suitable for the creation of intertidal flats.


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Original Ref. PSTR Section 8.7 Relevant Requirement a. b. c. The Contractor must make its own arrangements for temporary or permanent stockpiles of dredged or earthworks materials arising from the Contractor's Work. Materials which are not suitable for incorporation in the Project Works, other than surplus dredged material and unsuitable dredged material, must be disposed of outside the Project Site. Stockpiles located on land outside the Project Site are subject to the land owners' and occupiers' written consent, compliance with the Law, consent of relevant Authorities and compliance with the Environmental Documents. Stockpiles must not be placed in drainage lines, channels or paths. The disposal of surplus dredged and unsuitable dredged material must comply with section 7.4. Reference Section 1 CM5 It is not anticipated that any stockpiles are required outside the Project site. CM5


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Site establishment



Mitigation measures CM1. Contain dredged sediment including identified contamination within the reclamation. Mix contaminated sediments with inert sandy sediments within the reclamation area to minimise and dilute contamination impacts. CM2. Review background information and undertake additional site investigation if required to determine the location of any contamination in the seabed area to be excavated for estuary substrate. CM3. Limit sediment disturbance within Penrhyn Estuary when undertaking enhancement works. IND CM4. Ensure that dredged spoil is not removed from the project area. CM5. Place unsuitable dredged material in the designated spoil dumping area. CM6. Classify excess soil material, remove and dispose of off-site at an approved landfill in accordance with DECC waste classification guidelines.

Relevant Location

Relevant Approval conditions

Accountability Project Manager ­ Dredging Project Manager ­ Foreshore, Environmental Manager Project Manager Foreshore Project Manager ­ Dredging Project Manager ­ Dredging Project Manager ­ Foreshore, Environmental Manager Project Managers, Environmental Manager

Timing During dredging Prior to construction

Dredge zone & EIS ch18 reclamation area Estuary substrate dredging area Penrhyn Estuary Entire project Dredge area Foreshore areas COI Primary Submission section 6.4.1 EIS ch18; 18.5.1, ch37; 37.2 MCOA B2.10A PSTR 8.7 PSTR 8.7

During excavation During dredging During dredging During excavation

CM7. Ensure that any offsite material used is Virgin Excavated Natural Material (VENM) or clean fill, as defined by DECC Waste Classification Guidelines Part 1 2008.

Reclamation areas

COI Primary Submission section 6.4.1

During construction

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Monitoring Item If required, sampling of seabed in vicinity of area to be excavated for estuary substrate. If required, sampling of excess soil material. Frequency If required, once prior to commencement of substrate excavation If required, once prior to removal of soil material Applicable standards Interim Sediment Quality Guidelines (ANZECC, 2000) DECC Waste Classification Guidelines Responsibility Environmental Manager Reporting Monthly Report

Environmental Manager

Monthly Report

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Training Induction to address: Locations and types of known contaminants; Risks associated with contaminated sediments; Matters identified by the term `IND' (Induction) in the mitigation measures section Environmental Manager to provide specific briefing/instruction to: Ecological specialists working in Penrhyn Estuary regarding contamination; Birds Australia staff working in Penrhyn Estuary regarding contamination; Staff undertaking estuary earthworks regarding contamination. Toolbox talks to be conducted on: No specific issues

Resources Boats/barges; Sampling equipment & consumables; Laboratory; Protective clothing; Environment Officers, Environmental Manager, Project Manager - Dredging.

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Consultation Agencies / Stakeholder Sydney Ports Corporation (SPC) Details / Outcomes Approval of sub-plan required. Comments on draft to be incorporated in final version.

Position / Role Project Director Environmental Manager Environmental Representative Construction Manager ­ Civil Works Construction Manager ­ Dredging & Reclamation Project Manager ­ Dredging & Reclamation Project Manager ­ Foreshore & Estuary


Name Vince Newton Quentin Pitts Quentin Pitts John Taylor Hans Hoornaert Ive De Schutter Steve Glover

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Related Documents Appendix 1 - Identified Locations of Contamination (from DP site investigations) Marine Works Management Plan Construction Plan

References Interpretive Report on Geotechnical and Sediment Quality Investigations (Douglas Partners, Dec 2006) (INF021+) Further contamination investigations by Douglas Partners, 2007 (INF1047) Interim Sediment Quality Guidelines (ANZECC, October 2000) Handbook for Sediment Quality Assessment (CSIRO, 2005) Site Investigations for ASS and Aggressivity Assessment and Waste Classification along a Proposed Utilities Pipeline, Port Botany Expansion, Foreshore Road, Botany, NSW (Golder Associates, 27 May 2008) Australian and New Zealand Guidelines for Fresh & Marine Water Quality (ANZECC, 2000) Waste Classification Guidelines Part 1 ­ Classifying Waste DECC April 2008

Revision, Control & Amendment Revisions to this sub-plan will be made as required and in accordance with PSP-004 `Project Documentation'. The Environmental Manager will review outstanding issues and comments provided by the Verifier and SPC's Representative and address these either: in time to be endorsed by the Verifier and reviewed by SPC's Representative prior to commencement of any related activities or work; or at the next Management Review of the plan as outlined in the Project Management Plan.

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Incident Planning & Response Response to emergency situations will be undertaken in accordance with the Project Emergency Response & Incident Management Plan and environmental procedures. An emergency situation is an event that could present significant risk to the environment, personnel or the community, as determined by the Environment Manager or the Environmental Representative. Environmental incidents will be reported immediately to a Supervisor who will contact either the Environment Manager, or Environmental Officer if the Environment Manager is unavailable. All incidents will be investigated and the appropriate course of action will be taken to address the issues. Environmental incidents that harm or are likely to harm the environment will be reported to DECC (131 555) in accordance with the Protection of the Environment Operations Act 1997 ­ Duty to Notify. The Environmental Representative has the authority and independence to require reasonable actions to avoid or minimise unintended or adverse environmental impacts, and failing the effectiveness of such actions, to instruct that relevant actions be ceased immediately should an adverse impact on the environment be likely to occur. Potential incidents that could arise during the works include the following: Issue no 1. Incident Unanticipated contaminated soil requires offsite disposal. Response Classify the sediment. Notify SPC of the requirement to remove the sediment from the project site. Once approval is received from SPC, transport to a suitable waste facility. Responsibility Environmental Manager

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Appendix 1:

Location of Known Contaminated Sediments

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Locations of Contaminated Sediment ­ red indicates contamination at borehole, green indicates no contamination.

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