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Acid sulfate Management Plan Reference Document OPW19-0239 · OPW19/0239
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NOOSA COUNCIL
REFERENCE DOCUMENT
OPW19/0239 23 DEC 2019
Acid Sulfate Soils Management Plan
Proposed Unit Development
217-219 Gympie Terrace, Noosaville
Prepared for:
Gympie Terrace Noosaville Pty Ltd
C/- Ms Sasha Hopkins
The A Team Property Group
PO Box 523
Bentleigh East VIC 3165
Report Number: J000799-003-R-Rev0
April 2019
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Gympie Terrace Noosaville Pty Ltd
Record of Issue
Method of
Company Client Contact Version Date Issued
Delivery
C/- Ms Sasha Hopkins
Gympie Terrace Noosaville Pty Ltd The A Team Property Rev0 April 2019 Electronic
Group
J000799-003-R-Rev0 Page i
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Gympie Terrace Noosaville Pty Ltd Table of Contents 1.0 INTRODUCTION .................................................................................................................................... 1 2.0 OBJECTIVES ......................................................................................................................................... 1 3.0 PROPOSED DEVELOPMENT ............................................................................................................... 1 4.0 SITE DESCRIPTION .............................................................................................................................. 2 5.0 OVERVIEW OF ENVIRONMENTAL ISSUES ........................................................................................ 2 5.1 ASS Summary ........................................................................................................................................ 2 5.2 Groundwater ........................................................................................................................................... 3 5.3 Potential Environmental Impacts ............................................................................................................ 3 5.3.1 Summary of ASS Management Requirements................................................................................... 3 6.0 MANAGEMENT PROCEDURES ........................................................................................................... 4 7.0 RESPONSIBILITIES ............................................................................................................................... 4 8.0 NON-CONFORMANCE AND CORRECTIVE ACTION .......................................................................... 4 9.0 AUDITING ............................................................................................................................................... 4 10.0 COMMUNITY RELATIONS .................................................................................................................... 4 11.0 TRAINING ............................................................................................................................................... 5 12.0 LIMITATIONS ......................................................................................................................................... 5 Tables Table 1: Liming Rates ........................................................................................................................................ 2 Table 2: Summary of Groundwater Conditions ................................................................................................. 3 Table 3: Potential Environmental Impacts ......................................................................................................... 3 Appendices Appendix A Basement Level & Elevation Plan Appendix B Acid Sulfate Soil Management Procedures Appendix C Limitations J000799-003-R-Rev0 Page ii
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Gympie Terrace Noosaville Pty Ltd
Definitions
Environmental Protection Act 1994
Environmental Harm - Any adverse effect, or potential adverse effect (whether temporary or
permanent and of whatever magnitude, duration or frequency) on an
environmental value, and includes environmental nuisance.
Environmental Nuisance - Any unreasonable interference or likely interference with an environmental
value caused by
(a) noise, dust, odour, light; or
(b) an unhealthy, offensive or unsightly condition because of
contamination; or
(c) another way prescribed by regulation.
Material Environmental Harm - Is environmental harm (other than environmental nuisance)
(a) that is not trivial or negligible in nature, extent or context; or
(b) that causes actual or potential loss or damage to property of an
amount of, or amounts totalling, more than the threshold amount but
less than the maximum amount; or
(c) that results in costs of more than the threshold amount but less than
the maximum amount being incurred in taking appropriate action to
(i) prevent or minimise the harm; and
(ii) rehabilitate or restore the environment to its condition before
the harm.
“Maximum amount” means the threshold amount for serious environmental
harm.
“Threshold amount” means $5,000 or, if a greater amount is prescribed by
regulation, the greater amount.
Serious Environmental Harm - Is environmental harm (other than environmental nuisance)
(a) that causes actual or potential harm to environmental values that is
irreversible, of a high impact or widespread; or that causes actual or
potential harm to environmental values of an area of high
conservation value of special significance; or
(b) that causes actual or potential loss or damage to property of an
amount of, or amounts totalling, more than the threshold amount; or
(c) that results in costs of more than the threshold amount being incurred
in taking appropriate action to
(i) prevent or minimise the harm; and
(ii) rehabilitate or restore the environment to its condition before the
harm.
“Threshold amount’ means $50,000 or, if a greater amount is
prescribed by regulation, the greater amount.
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Gympie Terrace Noosaville Pty Ltd Glossary ANC Acid Neutralising Capacity ANZECC Australian & New Zealand Environmental Conservation Council ARMCANZ Agricultural and Resource Management Council of Australia and New Zealand DES Department of Environment and Science ASS MP Acid Sulfate Soil Management Plan NATA National Association of Testing Authorities PASS Potential Acid Sulfate Soil pHF Field pH pHFOX pH following rapid oxidation with hydrogen peroxide QASSIT Queensland Acid Sulfate Soils Investigation Team TAA Titratable Actual Acidity TPA Total Potential Acidity CRS Chromium Reducible Sulfur J000799-003-R-Rev0 Page iv
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Gympie Terrace Noosaville Pty Ltd
1.0 INTRODUCTION
This Acid Sulfate Soil Management Plan (ASS MP) has been prepared by Core Consultants Pty Ltd (Core) in
order to manage and minimise the ASS environmental impacts during construction of a proposed unit
development at 217 to 219 Gympie Terrace, Noosaville (the site).
This ASS MP references the results of a Geotechnical and ASS Investigation undertaken by Core (refer
Core report J000799-002-R-Rev0, dated December 2018). The procedures contained within this ASS MP
should be updated and revised to address conditions encountered that vary from those indicated by
investigations or where alternative construction methodologies are adopted.
The ASS MP was prepared with consideration of the following documents:
Queensland Acid Sulfate Soil Technical Manual: Soil Management Guidelines V4.0, 2014. Dear, S-E.,
Ahern, C. R., O'Brien, L. E., Dobos, S. K., McElnea, A. E., Moore, N. G. & Watling, K. M. Department
of Science, Information Technology, Innovation and the Arts, Queensland Government;
Guidelines for Sampling and Analysis of Lowland Acid Sulfate Soils in Queensland, 1998; Ahern, CR.,
Ahern, M.R. and Powell;
State Planning Policy, July 2014 (SPP14);
State Planning Policy – state interest guideline, Water quality, August 2014;
Environmental Protection Act 1994;
Environmental Protection Policy (Water) 2009.
A copy of the ASS MP and associated forms, registers and records shall be kept at the site office during the
construction stage of the development.
2.0 OBJECTIVES
The objective of the ASS MP is to mitigate or control potential impacts relating to the disturbance of ASS
across the site. Disturbance includes the excavation of ASS and potential dewatering of ASS impacted
groundwater.
3.0 PROPOSED DEVELOPMENT
The proposed development is to comprise a three-storey apartment building with a single level basement
carpark (excavation depth of approximately 2 m). A concept sketch of the proposed development is shown in
Image 1.
Image 1: Concept sketch of proposed development (Image from Chris Clout Design, Dwg No. C4.0).
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4.0 SITE DESCRIPTION
The site is located at 217 to 219 Gympie Terrace, Noosaville; covering a total area of approximately
0.11 hectares.
The site was generally flat and clear at the time of our investigation, comprising short grass and a few small
to medium sized trees located in the south east corner.
Site conditions at the time of our investigation are shown in Photograph 1.
Photograph 1: Site conditions at the time of fieldwork, looking south west from borehole BH1.
5.0 OVERVIEW OF ENVIRONMENTAL ISSUES
This section provides a brief overview of environmental issues related to ASS associated with the excavation
stage of the proposed development.
5.1 ASS Summary
The results from this investigation indicate that low levels of existing acidity and potential ASS (PASS) are
distributed throughout the natural sands across the site.
The SPP14 Guidelines require that the level of treatment for management of ASS is based on treatment of
all existing and potential acidity. The results of the laboratory testing have been accumulated in an Acid-
Base Account to give the Net Acidity for each sample in units of mol H+/tonne as presented in Table C1 of
our geotechnical report (ref. J000799-002-Rev0). This value has been calculated from sulfur trail potential
acidity (SCr) plus actual acidity (TAA).
Liming rates have been calculated in kg CaCO3/m³ using a factor of safety (fineness factor) of 1.5 and an
assumed bulk density of 1.8 tonne/m3. Calculation of liming rates required for full neutralisation of combined
existing and potential acidity are presented in Table 1.
Table 1: Liming Rates
Material Type Depth Treatment Rate
0 m – 1 m BGL 5 kg CaCO3/m³
Natural Sands
Below 1 m BGL 15 kg CaCO3/m³
Note: * Below Ground Level
** Liming rate based on maximum values.
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5.2 Groundwater
Groundwater inflow was encountered between approximately 1.2 m BGL and 1.5 m BGL during our
investigation. Table 2 summarises the groundwater conditions encountered on 14 November 2018.
Table 2: Summary of Groundwater Conditions
Borehole Location Groundwater Depth m BGL (~RL m AHD)
BH1 1.5 (0.27)
BH2 1.2 (0.55)
BH3 1.5 (0.20)
BH4 1.5 (0.17)
Groundwater measured in the standpipe in borehole BH1 was 2 m BGL (~RL -0.25 m) on 14 November
2018.
Given the site’s close proximity to the Noosa River, groundwater levels will likely vary with tidal influence and
prevailing weather conditions. Previous experience in the area indicates that the groundwater level can rise
close to the ground surface following periods of heavy or prolonged rainfall.
Provided that the retaining and dewatering system installed to support the basement excavation is able to
‘cut-off’ groundwater flows from the sands, seepage should be limited to flows emanating from sandy
materials in the base of the single level basement excavation. It should be possible to collect such seepage
by shallow gravel filled drains graded to a sump(s) from which the water could be removed from the
excavation to sewer or stormwater by submersible pumps (following treatment if necessary, depending on
the results of groundwater testing).
5.3 Potential Environmental Impacts
Potential environmental impacts associated with ASS disturbance during earthworks and construction for the
proposed development are summarised below in Table 3, along with the level of risk and management
strategies to mitigate the risk.
Table 3: Potential Environmental Impacts
Activity Issue Level of Risk to the Environment Mitigation Strategies
Acid formation and
transport due to Lime neutralisation treatment of
disturbance (by These works present a medium risk. excavated ASS and verification
excavation) of existing testing.
acidity and/or PASS.
Proposed
earthworks Release of acidic and/or
Regular water quality monitoring
and metals impacted waters
Medium to low level risk and treatment (if required) prior to
construction from within excavations to
discharge off-site.
surface waters.
Regular groundwater quality
Potential adverse impacts
monitoring and development of
to groundwater quality due Low level of risk
contingency measures (if
to earthworks activities.
required).
5.3.1 Summary of ASS Management Requirements
Provided the proposed ASS management procedures are effectively implemented and monitored throughout
the construction phase of the development, it is considered that there should be limited internal or external
ASS environmental impacts attributable to soils with existing or potential acidity.
The relevant issues, which are of significance when considering existing and potential acidity management
for the earthworks phase of this development, are:
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Treatment and validation of excavated soils with existing or potential acidity
Stockpiling, handling and transport of soils with existing or potential acidity
Potential adverse impacts to groundwater or surface water quality on site or within the surrounding
environment arising from the disturbance of soils with existing or potential acidity (if not managed
correctly).
6.0 MANAGEMENT PROCEDURES
The management procedures required to address the potential ASS issues associated with the earthworks
phase of the proposed development are presented in Appendix B, and include the following:
Procedure A: Management of ASS
Procedure B: Treatment and Verification of Excavated ASS
Procedure C: Monitoring of Water Quality
7.0 RESPONSIBILITIES
This section outlines the responsibilities to manage, document and report on ASS issues for the project.
The Project Manager is responsible for ensuring that all requirements of the ASS MP are met during the
project.
The Site Supervisor is responsible for ensuring the strategies and procedures prescribed in the ASS
MP are implemented at the site in accordance with the specified performance criteria.
The Environmental Manager is responsible for reviewing compliance with the ASS MP and
development of actions to address non-conformance.
All other site personnel are responsible for implementing strategies and procedures prescribed in the
ASS MP, as applicable to their work activities.
8.0 NON-CONFORMANCE AND CORRECTIVE ACTION
Any non-conformance to the ASS MP must be addressed as soon as is practical. The personnel responsible
for the non-conformance must be notified immediately for purposes of issuing rectification instructions.
9.0 AUDITING
The Environmental Manager will be responsible for ensuring that an auditing program is implemented for
construction and treatment works. The audit program shall aim to ensure compliance with the ASS MP and
relevant statutory requirements.
The Environmental Manager shall appoint an experienced ASS practitioner to conduct regular auditing of
activities and ASS management measures. Given the expected earthworks period, a weekly auditing
schedule is recommended. The frequency of these audits may gradually decrease if a high level of
compliance with the ASS MP is evident.
The audit shall take the form of a visual inspection of the works and associated control measures and a
review of monitoring data. A written record of auditing undertaken shall be maintained, including details on
the date of the audit; activities undertaken; observations made and any non-conformances identified. A copy
of the audit report shall be forwarded to the Environmental Manager within 2 days of the audit.
10.0 COMMUNITY RELATIONS
Concerns raised by the community (or other parties) in relation to ASS will be directed to the Environmental
Manager for action.
The Environmental Manager shall maintain a concerns register recording the following information:
1) Details: Name, address and phone number of party raising the concern.
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2) Nature of concern: Detail of issue, date of incident, people involved, and location.
3) Action taken or required: Any action proposed or undertaken to address the concern, including time and
date.
4) Response to action: Was the complainant satisfied with the outcome of the actions taken, if not, what
else needs to be done, or is it outside the scope of the development works.
5) Prevention or re-occurrence: What action has been taken by the nominated responsible person to
ensure the problem will not re-occur.
11.0 TRAINING
All site staff of Mosaic, and contractors, will be required to undergo a site induction covering all the elements
of the ASS MP. The induction will aim to instil environmental awareness by personnel including:
Introduce and explain the duty of care required under the Environmental Protection Act 1994.
Introduce the ASS MP and the responsibilities it places on all contractors and consultants.
Explain the various subordinate components of the ASS MP and the reporting and monitoring
procedures of the ASS MP and how they work.
Explain how to use the environmental procedures and plans in the ASS MP.
The content of the induction program will be endorsed and presented by the Site Supervisor, or delegate.
12.0 LIMITATIONS
Should you require any further information please contact the undersigned. We draw your attention to the
document, Limitations, which is included in Appendix C.
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Gympie Terrace Noosaville Pty Ltd Core Consultants Pty Ltd Yours sincerely, Simon Maggiora Walter Mastenbroek BE(Civil) MIEAust CPEng NER RPEQ MEngPr MSc BSc (Hons) PMP NER CPEng RPEQ Associate, Senior Geotechnical Engineer Associate, Senior Geotechnical Engineer SM/CK/WM/sm A.B.N. 75 603 384 050 J000799-003-R-Rev0 Page 6
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Gympie Terrace Noosaville Pty Ltd Appendix A Basement Level & Elevation Plan J000799-003-R-Rev0 Page 7
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FLOOD HEIGHT 2700 Section 1 SCALE: 1: 100 — LC CHRIS CLOUT DESIGN www.chriscloutdesign.com.au OFFICE 1/20 DUKE STREET. SUNSHINE BEACH 4567 E: [email protected] P: (07) 54748 107 9ace 1127508 [ail GENERAL NOTES: Use written dimensions only. DO NOT scale drawings. Contractors to verify all dimensions on site prior to commencing works. Site location in accordance with engineers details. These drawings are to be read in conjunetion with engineers design and details, the accompanying building specification and schedule offinishes. Ifin doubt, please request clarification. DO NOT ASSUME. PROJECT Proposed New Residence PROJECT NAME: WET EDGE VILLAS CLIENT: Sasha Hopkins SITE ADDRESS: Lot 1-RP66483 & Lot 4-RP70165,217-219 Gympie Terrace, Noosaville 4567 DRAWING TITLE: SECTION DATE: 18/10/18 SCALE 1:100 @A2 DRAWN BY: c.cLOUT ISSUE: CONCEPT SKETCH DRAWING No: C5.0
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Gympie Terrace Noosaville Pty Ltd Appendix B Acid Sulfate Soil Management Procedures J000799-003-R-Rev0 Page 8
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PROCEDURE A
Management of Acid Sulfate Soils
A1. GENERAL
The procedures outlined below are provided for the management of the excavation, stockpiling,
handling and transport of acid sulfate soils (ASS). It is proposed to either treat ASS materials in-situ
during excavation or transport to an onsite ASS treatment area as soon as practicable. The Site
Supervisor or their delegated representative will be responsible for the excavation, stockpiling,
handling and transport of excavated ASS materials. The Site Supervisor or their delegated
representative will also be responsible for the supervision of in-situ treatment, and management of
the treatment area, and for ensuring that the excavated ASS is remediated and verified in accordance
with the ASS MP and associated procedures.
A2. OBJECTIVES
1) Appropriately manage the stockpiling, handling and transport of confirmed and suspected ASS
materials
2) Comply with conditions of licences, permits or other approvals issued for the project.
A3. STATUTORY REQUIREMENTS AND GUIDELINES
1) Queensland Acid Sulfate Soil Technical Manual: Soil Management Guidelines V4.0, 2014. Dear, S-
E., Ahern, C. R., O'Brien, L. E., Dobos, S. K., McElnea, A. E., Moore, N. G. & Watling, K. M.
Department of Science, Information Technology, Innovation and the Arts, Queensland
Government
2) Ahern, CR., Ahern, M.R. and Powell, Guidelines for Sampling and Analysis of Lowland Acid Sulfate
Soils in Queensland, 1998
3) State Planning Policy – state interest guideline, Water quality, August 2014
4) Environmental Protection Act 1994
5) Environmental Protection Policy (Water) 2009
A4. MANAGEMENT MEASURES
A4 (A). MANAGEMENT OF EXCAVATIONS
An earthworks strategy shall be developed to plan and track movement, treatment and verification of
ASS materials.
Should groundwater inflow be considered excessive during basement excavations, alternative
construction methodologies will be considered to mitigate the possible impacts of lowered
groundwater levels and the potential oxidation of surrounding sediments.
All waters collected from groundwater and surface water inflow into excavations via seepage and
runoff must be retained, monitored and appropriately treated to comply with the appropriate discharge
criteria (Procedure C) prior to discharge off site or re-use on site.
A4 (B). STOCKPILING, HANDLING AND TRANSPORT OF ASS
Wherever practical the earthworks handling should involve transport directly from cut to treatment
areas and stockpiling of untreated soils with existing or potential acidity should be avoided. The
recommended maximum time period for which soils can be temporarily stockpiled without treatment
is 18 hours (overnight) for coarse sandy material and 3 days, (e.g. a weekend, 66 hours) for fine textured
silty clay material. The option of in-situ treatment may also be considered. However, treated soil will
still need to be stockpiled in an appropriate area for verification testing prior to removal off-site.
All confirmed ASS materials encountered during excavations will be transported to the designated ASS
treatment area or treated in-situ and stockpiled for verification sampling. Accurate details of material
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PROCEDURE A
Management of Acid Sulfate Soils
movements must be kept by the Site Supervisor or their delegated representative with respect to
volumes, origin, material type and destination.
Due care is to be taken when transporting saturated/supersaturated soils and sediments (e.g. wet,
silty/sandy material).
Any ASS materials that cannot be transported in the time frame detailed above must be stockpiled on
site on a suitably prepared storage area and the following additional management measures should be
followed:
Stockpiles are to be contained by bunds with stormwater runoff directed to a collection sump.
Bunds are to be constructed from low permeability materials that are not ASS.
A guard layer of neutralising agent (minimum 5 kg/m2) should be spread across the soil surface
prior to placement of the stockpile. The rate of neutralising agent applied should be based on 0.3
times the average total potential plus existing acidity for every 1 m height of soil in the stockpile.
The surface area of the stockpile is to be minimised by shaping and possibly capping or covering
to prevent moisture loss and rainfall entry.
A5. Responsibilities
During stockpiling, handling and transport the following levels of responsibility shall exist:
The Site Supervisor or their delegated representative is responsible for ensuring that the
requirements of the ASS MP are communicated to site staff.
The Site Supervisor or their delegated representative is responsible for ensuring the
management strategies and procedures prescribed in the ASS MP are implemented at the site.
All other site personnel are responsible for implementing and undertaking the management
strategies and procedures prescribed in the ASS MP, as applicable to their work activities.
A6. MONITORING AND REPORTING
Records shall be kept by the Site Supervisor or their delegated representative to verify volumes of
soils excavated and transported for treatment.
In addition, specific details regarding volumes, origin, material type and destination, in conjunction
with a photographic record of site development works associated with soil movements, should be
maintained by the Site Supervisor or their delegated representative.
The Site Supervisor or their delegated representative shall be responsible for ensuring that the
excavated ASS materials are managed in accordance with details provided above.
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PROCEDURE B
Treatment and Verification of Excavated ASS
B1. GENERAL
The procedures outlined below are provided for the on-site treatment and verification of identified ASS
materials located across the proposed development site to be excavated during earthworks and
construction.
B2. OBJECTIVES
Appropriately treat and manage ASS materials so as to minimise adverse effects on the natural and
built environment (including infrastructure).
Comply with conditions of licences, permits or other approvals issued for the project.
B3. STATUTORY REQUIREMENTS AND GUIDELINES
1) Queensland Acid Sulfate Soil Technical Manual: Soil Management Guidelines V4.0, 2014. Dear, S-E.,
Ahern, C. R., O'Brien, L. E., Dobos, S. K., McElnea, A. E., Moore, N. G. & Watling, K. M. Department of
Science, Information Technology, Innovation and the Arts, Queensland Government
2) Ahern, CR., Ahern, M.R. and Powell, Guidelines for Sampling and Analysis of Lowland Acid Sulfate
Soils in Queensland, 1998
3) State Planning Policy – state interest guideline, Water quality, August 2014
4) Environmental Protection Act 1994
5) Environmental Protection Policy (Water) 2009
B4. TREATMENT MEASURES
B4 (a) Earthwork Strategy
An earthworks strategy shall be developed to plan and track movement, treatment and verification of
confirmed ASS materials.
B4 (b) Treatment Facility
A treatment area shall be constructed within the site in general accordance with the requirement detailed in
Soil Management Guidelines, 2014 (refer Figure B4-1) and the following additional requirements:
The treatment area should be located within a suitable area of the site on non-ASS materials.
The treatment area shall be prepared by stripping vegetation, topsoil and soil containing significant
amounts of organic material and compacting the surface with a smooth drum roller. An area of at least
1 m width shall be left between the treatment area and bunds to allow collection of runoff and direction
to sumps. Refer to Procedure C for monitoring and treatment requirements applicable to collected
waters.
A guard layer of fine ground agricultural lime shall be applied to the treatment areas prior to placement
of soils at a minimum rate 5 kg/m2 for each 1 m height of soil to be treated.
The treatment facility shall be inspected on a daily basis and maintained to prevent escape of soils or water
from the facility.
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PROCEDURE B
Treatment and Verification of Excavated ASS
Figure B4-1: Schematic cross-section of a treatment pad, including a compacted clay layer, guard
layer, leachate collection system and containment with bund
B4 (c) ASS Treatment
Excavated ASS materials shall be placed into identified treatment lots (not more than 250 m3) within the
treatment area where the material shall be spread in layers and allowed to dry (if required). The overall layer
thickness shall be a maximum 300 mm loose thickness.
Where required, drying shall be enhanced by mechanical methods (rotary hoe, disc plough, etc) to create a
relatively homogenous, friable material prior to addition of lime for neutralisation.
Maintain soil moisture through the following methods: controlled irrigation; covering with plastic to reduce
evaporation; or application of lime soon after excavation of moist soils. These measures will improve the
dispersion of lime throughout the soil profile.
Liming rates have been calculated in kg CaCO3/m³, using a factor of safety (fineness factor) of 1.5 and an
assumed bulk density of 1.8 tonne/m3. Calculation of liming rates required for full neutralisation of combined
actual and potential acidity are presented in Table B1.
Table B1: Liming rates
Material Type Depth Treatment Rate
0 m – 1 m BGL 5 kg CaCO3/m³
Natural Sands
Below 1 m BGL 15 kg CaCO3/m³
Note: * Below Ground Level
** Liming rate based on maximum values.
These liming rates can be immediately adopted for lime neutralisation treatment.
In-situ treatment may also be carried out. This would involve the application of lime to the surface of the soil
at a rate sufficient to treat a soil thickness of 300 mm. The lime should then be mixed through the soil profile
(to a maximum depth of 300 mm) with an excavator, and validation samples collected. Once the 300 mm
layer has been treated and removed the process can start again and continue until the depth of excavation is
reached.
It should be noted that should this process be adopted then the offsite disposal location would be required to
have a bunded area for stockpiling of the treated soil until verification results have confirmed appropriate
lime treatment.
The following management measures should be followed at the offsite disposal location:
Stockpiles are to be contained by bunds with stormwater runoff directed to a collection sump. Bunds are
to be constructed from low permeability materials.
The surface area of the stockpile is to be minimised by shaping and possibly capping or covering to
prevent moisture loss and rainfall entry.
Each stockpile will require tracking to allow for future lime treatment should it be required.
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PROCEDURE B
Treatment and Verification of Excavated ASS
B4 (e) Verification Testing
Verification samples shall be collected for treated material at a rate of 1 sample per 250 m3. The samples
shall be formed by compositing materials from three randomly selected locations. Samples shall be
collected over the full thickness of the treated lot. The Chromium Suite shall be conducted on each sample
to confirm net acidity by Acid Base Accounting.
B5. PERFORMANCE CRITERIA
To confirm adequate lime treatment, laboratory testing must demonstrate the following:
A neutralising capacity of more than 1.5 times the sum of existing plus potential acidity, all measured in
the same units (and using a minimum safety factor of 1.5) and
A pHKCL value of equal or greater than 6.5
B6. CONTINGENCY MEASURES
Additional lime treatment and further verification testing shall be conducted where adequate neutralisation is
not initially indicated.
B7. PERFORMANCE INDICATORS
Item Performance Indicator
An appropriate earthworks strategy has been prepared to track
Earthworks strategy
characterisation, treatment and verification of each earthworks lot.
Liming rates Correct liming rates have been applied
Verification samples collected for each identifiable 250 m3 of treated material
Treatment verification If verification shows material has a positive net acidity, additional treatment
has been employed
Non conformance All non-conformances have been reported and rectified
B8. MONITORING AND REPORTING
Records shall be kept to verify volumes of soils transported to the treatment facility or treated in-situ.
The Site Supervisor shall be responsible for ensuring that samples are collected at a rate of 1 per 250 m3, if
the above liming rates are not used, to formulate more specific liming rates.
The Site Supervisor shall be responsible for ensuring that lime neutralisation and verification tests are
completed for each 250 m3 of excavated ASS material.
The Site Supervisor shall maintain a register of testing results and a record of inspections.
A summary report of all test results and inspections shall be complied by the Site Supervisor each week and
retained on site.
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PROCEDURE C
Monitoring of Water Quality
C1. GENERAL
The procedures outlined below are provided to monitor and manage water quality in open excavations and
run-off collection in treatment areas. Contingency measures are also provided for treatment and discharge of
minor amounts of water.
C2. OBJECTIVES
Appropriately monitor waters entering open excavations
Appropriately manage waters to be discharged from open excavations
Appropriately monitor and treat (if required) run-off collected in treatment areas
Appropriately monitor groundwater to identify water quality changes that may indicate ASS impact
Comply with conditions of licences, permits or other approvals issued for the project
C3. STATUTORY REQUIREMENTS AND GUIDELINES
1) State Planning Policy – state interest guideline, Water quality, August 2014
2) Queensland Acid Sulfate Soil Technical Manual: Soil Management Guidelines V4.0, 2014. Dear, S-E.,
Ahern, C. R., O'Brien, L. E., Dobos, S. K., McElnea, A. E., Moore, N. G. & Watling, K. M. Department of
Science, Information Technology, Innovation and the Arts, Queensland Government
3) Environmental Protection Act 1994
4) Environmental Protection Policy (Water) 2009
C4. IMPLEMENTATION MEASURES
The following provides a list of the environmental control measures for management of surface water and
groundwater at the site:
Water quality monitoring will be undertaken in accordance with C5
All surface water run-off and groundwater seepage within excavations is to undergo monitoring to
determine if treatment is required for quality correction prior to off-site discharge, or reuse on site
Agricultural lime or caustic soda will be kept on site at all times for pH adjusting of waters before
discharging
Discharge to surface waters, sewers or stormwater should meet with the requirements and conditions of
the disposal permit issued for the project
Two groundwater monitoring wells shall be installed external to the proposed basement excavation (one
on the northern side of the basement and one on the southern side). Groundwater monitoring wells
shall be monitored four times over a period of one month before earthworks and construction
commence to establish baseline levels of the following parameters;
Field measurements of pH, redox potential (Eh or ORP), dissolved oxygen, standing water level and
electrical conductivity (EC)
Laboratory measurements chloride, sulfate, total acidity, total alkalinity, dissolved aluminum
(filtered), and dissolved iron (filtered)
C5. INSPECTION AND MONITORING
C5 (a) Surface Water Monitoring
Waters from dewatering (if required) and all surface water run-off and groundwater seepage within
excavations shall be monitored prior to discharge during earthworks and construction works. Surface water
shall be monitored for pH, dissolved oxygen, suspended solids, oil, grease floating scum, litter and total and
dissolved aluminium and iron.
April 2019
J000799-003-R-Rev0 – Procedure C 1/3
Page 21
PROCEDURE C
Monitoring of Water Quality
Surface water not meeting the performance criteria specified in Section C6 will require treatment prior to
discharge.
C5 (b) Groundwater Monitoring
During construction (excavation works) monitoring of groundwater shall comprise fortnightly monitoring
of the following:
Field measurements of pH, redox potential (Eh or ORP), standing water level and electrical
conductivity (EC)
Laboratory measurements chloride, sulfate, total acidity, total alkalinity, and total and dissolved
aluminum and iron
Post construction monitoring comprising four groundwater monitoring events over a period of two
months for the following parameters:
Field measurements of pH, redox potential (Eh or ORP), standing water level and electrical
conductivity (EC)
Laboratory measurements chloride, sulfate, total acidity, total alkalinity, dissolved aluminium
(filtered), and dissolved iron (filtered)
Extension of the post construction monitoring program beyond this will be determined by a suitably qualified
Environmental Consultant following review of post construction results.
C6. PERFORMANCE INDICATORS
C6 (a) Surface Water Performance Indicators
The following adopted performance indicators are considered as acceptable outcomes in relation to
ASS and disposal of all waters including stormwater run-off, groundwater seepage and leachate from
ASS will achieve the following quality prior to release from the site.
Parameters Units Performance Indicator
pH pH Within the range of 6.5 – 8.5 pH units
Suspended Solids mg/L < 50 mg/L
Dissolved Oxygen mg/L > 6.0 mg/L
Oil, grease, floating scum, litter n/a No visible plume or evidence
Dissolved Iron mg/L <0.3 mg/L
Dissolved Aluminium mg/L <0.2 mg/L
April 2019
J000799-003-R-Rev0 – Procedure C 2/3
Page 22
PROCEDURE C
Monitoring of Water Quality
C6 (b) Groundwater Performance Indicators
Baseline Site Specific Criteria
Parameters* Units Performance
Range
Baseline - 0.3 pH unit change below
Yet to be the lower baseline range and an
pH pH
determined upper limit of 8.5
Aluminium Yet to be
mg/l +/- 10% of baseline range
(dissolved) determined
Aluminium Yet to be
mg/l +/- 10% of baseline range
(total) determined
Iron Yet to be
mg/l +/- 10% of baseline range
(dissolved) determined
Yet to be
Iron (total) mg/l +/- 10% of baseline range
determined
* Note that total acidity/alkalinity & chloride/sulfate ratio should also be monitored, but no performance limits are set
C7. CONTINGENCY MEASURES
All surface waters (any waters collected in excavations) and precipitates that cannot be contained and
treated for discharge off site, are to be removed and disposed of through trade waste or another lawful
method.
C8. MONITORING & REPORTING
The Site Supervisor shall be responsible for ensuring all on-site monitoring listed in section C5 is conducted
at the required frequency.
The Site Supervisor shall maintain a register of all on-site testing results and a record of inspections.
A summary report of all test results and inspections shall be compiled by the Site Supervisor each week and
submitted to the Project Manager.
The Site Supervisor shall inform the Project Manager of non-compliance upon detection. The Project
Manager shall inform Council of such non-compliances as soon as practicable and instigate an assessment
of the impact.
April 2019
J000799-003-R-Rev0 – Procedure C 3/3
Page 23
Gympie Terrace Noosaville Pty Ltd Appendix C Limitations J000799-003-R-Rev0 Page 9 [OCR of page images] Gympie Terrace Noosaville Pty Ltd Appendix C Limitations J000799-003-R-RevO Page 9
Page 24
LIMITATIONS This Document has been provided by Core Consultants Pty Ltd (“Core”) subject to the following limitations: This Document has been prepared for the particular purpose outlined in Core’s proposal and no responsibility is accepted for the use of this Document, in whole or in part, in other contexts or for any other purpose. The scope and the period of Core’s Services are as described in C o r e ’s proposal, and are subject to restrictions and limitations. Core did not perform a complete assessment of all possible conditions or circumstances that may exist at the site referenced in the Document. If a service is not expressly indicated, do not assume it has been provided. If a matter is not addressed, do not assume that any determination has been made by Core in regards to it. Conditions may exist which were undetectable given the limited nature of the enquiry Core was retained to undertake with respect to the site. Variations in conditions may occur between investigatory locations, and there may be special conditions pertaining to the site which have not been revealed by the investigation and which have not therefore been taken into account in the Document. Accordingly, additional studies and actions may be required. In addition, it is recognised that the passage of time affects the information and assessment provided in this Document. Core’s opinions are based upon information that existed at the time of the production of the Document. It is understood that the Services provided allowed Core to form no more than an opinion of the actual conditions of the site at the time the site was visited and cannot be used to assess the effect of any subsequent changes in the quality of the site, or its surroundings, or any laws or regulations. Any assessments made in this Document are based on the conditions indicated from published sources and the investigation described. No warranty is included, either express or implied, that the actual conditions will conform exactly to the assessments contained in this Document. Where data supplied by the client or other external sources, including previous site investigation data, have been used, it has been assumed that the information is correct unless otherwise stated. No responsibility is accepted by Core for incomplete or inaccurate data supplied by others. Core may have retained subconsultants affiliated with Core to provide Services for the benefit of Core. To the maximum extent allowed by law, the Client acknowledges and agrees it will not have any direct legal recourse to, and waives any claim, demand, or cause of action against, Core’s affiliated companies, and their employees, officers and directors. This Document is provided for sole use by the Client and is confidential to it and its professional advisers. No responsibility whatsoever for the contents of this Document will be accepted to any person other than the Client. Any use which a third party makes of this Document, or any reliance on or decisions to be made based on it, is the responsibility of such third parties. Core accepts no responsibility for damages, if any, suffered by any third party as a result of decisions made or actions based on this Document. Limitations Page 1 of 1 Date: 12/07/2018 FRM-065 Uncontrolled When Printed Issue: 1.02
Page 25
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BOARD OF PROFESSIONAL ENGINEERS OF QUEENSLAND Mr Simon Andrew Maggiora Core Consultants Pty Ltd LO) Date Registered 7/10/2015 From @) Type Engineer Category Status Active Date Registered to 6/30/2020 Share this page Ht) i & Profile Company Core Consultants Pty Ltd Registration # 12467 Area of Engineering Civil Contact Number 07 5475 5900 Assessment Entity Informal Simon Restriction on Registration Social Profiles There are no social profiles defined. Business Address Address 52 Second Avenue MAROOCHYDORE QLD 4558 Phone 07 5475 5900 Sign In SEARCH THE REGISTER
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