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6. Noosa River DMP Ver0 (Combined)
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Concept Dredge Management Plan Noosaville Prepared for Noosa Shire Council By International Coastal Management
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Full text of sections 2 to 67 (of 392)
Section 2
Document Control Sheet
ICM Project Number:
Prepared by: Martin Mulcahy
Title: Senior Coastal Engineer
Company: International Coastal Management
Final Review: Bobbie Corbett
Title: Principal Coastal Engineer
Company: International Coastal Management
Approved for final release: Bobbie Corbett
Title: Principal Coastal Engineer
Company: International Coastal Management
Version History
Version No. Date Changed by Nature of Amendment
DRAFT 12/2022 MM Draft issue for owners consent
V0 27/01/2023 MM / BC Update section 4.1.2 & 5.5.
PacGeo report 2023 available.
This document has been produced by International Coastal Management Pty Ltd (ICM) in accordance with the
terms and limitations of the brief by Noosa Shire Council. In preparing this report, ICM has used information
provided by the Client and others identified herein. ICM does not and shall not assume any responsibility or
liability whatsoever to any third party arising out of any use or reliance by any third party on the content of this
document. This document is not to be used without the express approval Noosa Shire Council.
i
Section 3
Table of Contents
INTRODUCTION............................................................................................................................................. 3
LOCATION .............................................................................................................................................. 3
PROJECT DETAILS ................................................................................................................................ 3
DRAWINGS ............................................................................................................................................. 4
PLANT ..................................................................................................................................................... 5
METHODOLOGY .................................................................................................................................... 5
SITE-SPECIFIC APPROVALS ................................................................................................................ 6
SCOPE OF CONCEPT DREDGE MANAGEMENT PLAN ....................................................................... 6
LEADERSHIP ................................................................................................................................................. 7
LEADERSHIP AND COMMITMENT ........................................................................................................ 7
PLANNING ..................................................................................................................................................... 8
GENERAL OBLIGATIONS ...................................................................................................................... 8
ENVIRONMENTAL PROTECTION ACT 1994................................................................................. 8
LOCAL MAPPING ................................................................................................................................... 8
ACID SULFATE SOILS.................................................................................................................... 8
STATE MAPPING .................................................................................................................................... 9
MATTERS OF STATE ENVIRONMENTAL SIGNIFICANCE ........................................................... 9
CULTURAL HERITAGE................................................................................................................. 10
SITE INVESTIGATIONS ............................................................................................................................... 11
SURVEY ........................................................................................................................................ 11
GEOTECHNICAL INVESTIGATIONS............................................................................................ 12
MARINE PLANTS .......................................................................................................................... 13
DREDGING & NOURISHMENT- ENVIRONMENTAL ASPECTS, OBJECTIVES AND PLANNING
ACTIONS .............................................................................................................................................................. 18
WATER QUALITY ................................................................................................................................. 18
NOISE.................................................................................................................................................... 19
AIR QUALITY, ODOUR AND DUST MANAGEMENT ........................................................................... 19
FLORA AND FAUNA ............................................................................................................................. 20
LAND ..................................................................................................................................................... 21
CULTURAL HERITAGE......................................................................................................................... 22
NOOSA RIVER CARAVAN PARK, HERITAGE IMPACT STATEMENT (HIS) .............................. 22
i
Section 4
WASTE .................................................................................................................................................. 25
OPERATION ................................................................................................................................................. 27
OPERATIONAL PLANNING AND CONTROL ....................................................................................... 27
EMERGENCY PREPAREDNESS AND RESPONSE ............................................................................ 27
OIL SPILL ...................................................................................................................................... 27
INCIDENT REPORTING................................................................................................................ 27
PERFORMANCE EVALUATION .................................................................................................................. 28
MONITORING, MEASUREMENT, ANALYSIS AND EVALUATION ...................................................... 28
GENERAL...................................................................................................................................... 28
COMPLAINTS ............................................................................................................................... 28
EVALUATION OF COMPLIANCE.................................................................................................. 28
INTERNAL AUDIT ................................................................................................................................. 31
MANAGEMENT REVIEW ...................................................................................................................... 31
IMPROVEMENT ........................................................................................................................................... 32
NON-CONFORMITY AND CORRECTIVE ACTION .............................................................................. 32
CONTINUAL IMPROVEMENT .............................................................................................................. 32
DRAWINGS ................................................................................................................................. A-1
APPROVALS............................................................................................................................... B-1
GEOTECHNICAL INVESTIGATIONS ......................................................................................... C-1
MARINE BIOTA IMPACT ASSESSMENT .................................................................................. D-1
CORRECTIVE ACTION & INCIDENT REPORTING ....................................................................E-1
COMPLAINT REGISTER .............................................................................................................. F-1
ii
Section 5
INTRODUCTION
LOCATION
The site location for dredging/nourishment works is within the Noosa River and along the southern foreshore of
the Noosa River between Hilton Esplanade and Weyba Creek (see Figure 1).
Figure 1: Site Location
PROJECT DETAILS
Localised erosion along the Noosa River southern foreshore is occurring due to natural coastal processes and
boat wakes. The foreshore is a high value area for public use and amenity and the ongoing erosion is threatening
vegetation, parkland and infrastructure. Current approvals exist in for parts of this foreshore (Areas 1 – 6),
however erosion hotspots are changing over time and additional areas require protection with sand re-
nourishment.
The Noosaville Dredge Management Plan 2006 has been used for dredging works to date; however, this updated
management plan specifies requirements consistent with present day sediment testing (NAGD 2009) and
environmental monitoring throughout dredging activities.
3
Section 6
The proposed dredging works include the following:
• Dredging Noosa River for the purposes of beach re-nourishment
o Dredging of up to 10,000t
o Existing approved dredge areas expanded to cover the extent from Hilton Esplanade to Weyba
Creek, instead of individual local areas along this extent. Exclusion zones within private lease
jetty areas still applies.
o Dredging to maintain 25m buffer from Fish Habitat Area (considering anticipated batters at the
time of dredging)
o Dredging to generally maintain -2.5m AHD depth, but extends to -4m AHD depth along Hilton
Esplanade where natural surface level is already deeper than -2.5m AHD and suitable sand is
available at depth.
o Dredge material to be sourced from below LAT at the time of works.
o Dredge areas are to target shoals in close proximity to the nourishment area and minimise
dredge depth by targeting shoals.
o Dredging to be undertaken with suitable plant (e.g. small cutter suction dredger with cyclone).
o Dredging is to target uniform extraction across wide area (i.e. avoid digging holes).
o Material is suitable for on-shore placement (consistent sediment testing report, Pacific Geotech
2022)
• Nourishment of foreshore
o Placement of up to 10,000t per year.
o Material is to be sand suitable for nourishment. Any unsuitable material encountered is not to be
placed on the foreshore.
o Nourishment profile is to be consistent with natural foreshore profiles and transition smoothly to
the existing profile at the works extent.
o No impacts on marine plants (including mangrove pneumatophores) is deemed to be achieved
when works are not occurring within 1m of the marine plant or a specialist marine plant expert
provides written advice that the nourishment is beneficial to the stability or health of the marine
plant or stipulates that a smaller offset would result in no impact.
• Existing approved nourishment areas expanded to cover the extent from Hilton Esplanade to Weyba
Creek, instead of individual local areas along this extent. Exclusion zones within private lease jetty areas
still applies. No marine plants (including mangrove pneumatophores / roots) to be removed or damaged
without approval. This is deemed to be achieved when works are not occurring within 1m of the marine
plant, or a specialist marine plant expert provides written advice that the nourishment is beneficial to the
stability or health of the marine plant or stipulates that a smaller offset would result in no impact.
• No works within private lease jetty areas.
DRAWINGS
Dredging and nourishment works are to be performed in accordance with the ICM project drawings (Table 1). For
copy of drawings see Appendix A
4
Section 7
Table 1: Project Drawing Register
Drawing No. Drawing Title Revision Date
NRD-000 Title Page 1 27-01-23
NRD-001 Scheme of works 1 27-01-23
NRD-002 Typical Section 1 27-01-23
NRD-003 Plan 1 1 27-01-23
NRD-004 Plan 2 1 27-01-23
NRD-005 Plan 3 1 27-01-23
NRD-006 Plan 4 1 27-01-23
NRD-007 Plan 5 1 27-01-23
NRD-008 Plan 6 1 27-01-23
PLANT
A cutter-suction dredger is expected to be the most suitable plant for these works. Dredge may need to be fitted
with a cyclone to meet sediment and water quality requirements. Alternate plant is acceptable provided sediment
and water quality requirements are met.
All plant and equipment is to be:
• Registered.
• Current certificate of operation (where applicable).
• Current certificate of survey (where applicable).
• Current and appropriate insurances.
• Appropriately lit and/or marked to the satisfaction of the Harbour Master.
• Clean and maintained in a proper and effective condition.
• Operated in a proper and effective manner.
• Removed from site on completion of the works.
METHODOLOGY
The works are anticipated to be undertaken using a cutter-section dredger and placed directly onshore via floating
pipeline. Works will be undertaken in response to erosion and be ongoing as required, staying within the annual
limit of 10,000t per year.
5
Section 8
SITE-SPECIFIC APPROVALS
Works are to be performed in accordance with the relevant project approvals and permits. A copy of all relevant
permits is to be available on site and onboard any vessels throughout the works.
Table 2: Relevant Approvals
Permit Type Permit Number
Operational Works Permit TBA
Environmental Authority TBA
SCOPE OF CONCEPT DREDGE MANAGEMENT PLAN
The purpose of this Concept Dredge Management Plan is to document a structured program that:
• Sets the environmental objectives or standards to be achieved;
• Identifies the potential environmental harm which may occur from routine operations and establishes, and
documents measures to avoid this harm as far as practicable;
• Identifies extraordinary factors (i.e. abnormal operation, emergencies) that may cause environmental
harm and establishes and documents contingency plans to deal with these;
• Ensures all persons carrying out the activity are aware of the environmental risks, and are trained in the
measures and contingency plans to deal with them;
• Implements monitoring of environmental performance to ensure the effectiveness of the measures and
contingency plans;
• Assists the communication of environmental information throughout the organisation and to the
administering authority; and
• Provides for continual improvement.
A Site-Specific Environment Management Plan is to be developed and implemented by the Contractor and is to
be consistent with:
• Relevant permit conditions.
• Relevant legislation requirements.
• Concept Dredge Management Plan (this document).
• Contract documentation.
This Site-Specific Environment Management Plan is to be reviewed and accepted by the approval holder
(Principal) prior to the works being undertaken.
To achieve the intended outcomes, including enhancing the environmental performance, the dredging contractor
is to establish, implement, maintain and continually improve the plant and vessel specific Safety Management
Systems and this Site-Specific Environmental Management Plan, including the processes needed and their
interactions.
6
Section 9
LEADERSHIP
LEADERSHIP AND COMMITMENT
The Site-Specific Dredge Management Plan prepared by the Contractor shall demonstrate leadership and
commitment with respect to the environment management system, including evidence of a company environment
management policy and corresponding systems and procedures.
7
Section 10
PLANNING
GENERAL OBLIGATIONS
Environmental Protection Act 1994
The Environmental Protection Act 1994 states that we all have a general environmental duty. Meeting the general
environmental duty needs to consider:
• Nature of the harm or potential harm
• Sensitivity of the environment
• Current state of technical knowledge for the activity (i.e. current best practice)
• Likelihood of possible measures being successful
• Financial implications of taking different measures
Environmental harm is defined by the Environmental Protection Act 1994 as 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. It may be caused as a direct or indirect result of the
activity or the combined effect of the activity and other activities or factors.
In the event that failing to fulfil your general environmental duty results in unapproved environmental harm, the
relevant authorities are to be notified within 24 hours of becoming aware of an incident.
LOCAL MAPPING
Acid Sulfate Soils
Local Mapping identifies land as being at or below 5m AHD (Figure 2).
Acid sulfate testing, undertaken during Geotechnical Investigations, is shown in Section 4.1.2.
8
Section 11
Figure 2: Acid Sulfate Soils Overlay (Noosa Shire Mapping)
STATE MAPPING
The following state mapping relevant to the works has been considered.
Matters of State Environmental Significance
The Noosa River has areas of MSES High ecological significance wetlands, wildlife habitat, declared fish habitat
as identified in Figure 3. The endangered and of concern regional ecosystems associated are associated with
beach ridges and bird species which are unlikely to be affected by the proposed dredging and nourishment works.
The area identified for dredging and nourishment maintains a 25m buffer from the adjacent Fish Habitat Area
(Figure 4) consistent with previous approvals and are not considered to be within the potential zone of influence of
the proposed dredging works.
9
Section 12
Figure 3: Site relative to Matters of State Environmental Significance (Source: SPP IMS; Annotated)
Figure 4. Declared Noosa River Fish Habitat Area
Cultural Heritage
The Noosa River Caravan Park at Munna Point is listed on the Queensland Heritage Register (Figure 5).
Figure 5. Munna Point Caravan Park Cultural Heritage Site
10
Section 13
SITE INVESTIGATIONS
Survey
Bathymetric survey of the Noosa River was undertaken by Hydra Logic 2019 (Figure 6), this surface was used to
prepare the dredge design. It is expected that the riverbed surface will vary over time, due to natural sand
migration and flood events.
A sub-bottom survey was undertaken by Acoustic Imaging 2020 that identified potential sand nourishment
sources. It was shown that a source of clean sand is expected adjacent Hilton Esplanade up to 4.5m below
riverbed surface (Figure 7). Given the existing riverbed surface at this location is already up to -4m AHD in this
location, a proposed increase in the dredge depth (deeper than -2.5m AHD for other locations) is proposed for
this area. This is supported by additional sediment testing by Pacific Geotech 2022 (Section 4.1.2).
Figure 6. Bathymetric Survey Noosa River (Hydra Logic, 2019)
11
Section 14
Figure 7. Sub-bottom profiling Noosa River, Hilton Esplanade (Acoustic Imaging, 2020)
Geotechnical Investigations
Soil Surveys 2006
Acid sulfate testing was undertaken in November 2006 by Soil Surveys Engineering P/L as part of the original
Noosaville Dredge Management Plan (2006), with results indicating that:
“there is ample self buffering capacity present in the soils to effectively neutralise any acid that could potentially
be produced. Therefore we recommend that no lime treatment would be required on the samples tested during
this investigation”
BMT 2022
The BMT Sediment Sampling Report, shows that the sand samples were dominated by sand fractions (0.06-2
mm), with a combined average of approximately 93%. There were minor (typically <10%) components of clay (<2
μm), silt (2-60 μm) and gravel (0.2-6 cm) fractions (0.06-2 mm) in samples. There were no cobbles (>6cm) or in
any of the site horizons.
Updated sediment sampling was undertaken by BMT in 2022; however, results were not consistent with the
previous Soil Surveys investigation, showing potential acid sulfates, generally at extremely low levels with one
high spot identified at BH08.
BMT 2022 assessed all samples in accordance with NAGD 2009, providing the following summary:
“Overall, the sediments were relatively clean with no analytes exceeding the relevant NAGD screening levels or
NEPM investigation levels, thus would be suitable for offshore or land-based disposal, with suitable PASS
material management.”
12
Section 15
Pacific Geotech 2023
Subsequent geotechnical investigations and assessment regarding acid sulfates were undertaken by Pacific
Geotech (January 2023), with the following detail regarding acid sulfate management:
“The initial testing indicated an acid sulfate hot spot in the area of BH08. This additional testing has confirmed
the material initially encountered has either been naturally scoured away or is of such an isolated volume so as
to not be significant and acid sulfate treatment will not be required. It is possible that the material was related to
sediment build-up at the outlet of the stormwater drain but this is not considered to be an issue now.”
“The results of the earlier laboratory testing have been reviewed. Considering the proposed dredging
methodology (ie. use of a cyclone separator) and the natural buffering capacity of the sands, treatment for the
acid sulfate neutralisation is not likely to be required. This should be confirmed with validation testing at the time
of the dredging operation. Validation testing should be undertaken at a rate of 1 test per 250m3 of disturbed
material.”
“On the basis of the testing undertaken, all samples provided nett acidity values below the QASSIT defined
action criteria. Therefore, soils disturbed on-site do not require treatment for acid sulfate potential.”
Summary
As such, the sandy sediments are considered to be suitable for nourishment, acid sulfate treatment is not required
and the material is uncontaminated in accordance with NAGD 2009.
Marine Plants
Marine plants include mangroves, seagrass, samphires, saltcouch and saltmarsh plants, algae and other tidal
plants growing adjacent to the tidal zone, landward and seaward. They provide important habitat for fish and are
protected against deliberate damage or destruction under the Fisheries Act 1994.
Biome Consulting have undertaken a marine plants survey on the foreshore at Hilton Esplanade, Gympie Terrace
and Munna Park (Appendix D). The scope of this survey focussed on areas proposed to be dredged and
nourished; it did not include the entire foreshore extent as the presence of marine plants changes over time and
the potential for nourishment to impact on existing marine plants depends on the state of the foreshore at the time
of the works and many sections of foreshore are accreted and currently do not require nourishment.
The following advice is summarised from the report:
“The marine plants on the foreshore and intertidal zone of the river have the potential to be impacted by
the uncontrolled placement of sand over root zones. Where present, seagrasses have the potential for
direct and indirect disturbances from sand extraction.”
“Seagrass surveys were undertaken by wading the shallow areas of the extraction and nourishment sites
and using an underwater drone in the deeper areas. No seagrass was recorded.”
“Marine plants growing in the intertidal and foreshore areas were recorded along the Gympie Terrace and
Hilton Esplanade foreshores and included mangroves (Avicennia and Rhizophora species) and
Casuarina glauca. No marine plants were recorded at Munna Park.”
13
Section 16
“Two Avicennia marina (Grey Mangrove) were recorded in the intertidal zone of the replenishment area
along Gympie Terrace. Seedling mangroves and one established A. marina were recorded at the
interface of the existing and proposed new extraction areas at Hilton Esplanade.”
“It is important to limit the placement of any sediment that may adversely affect soil permeability,
especially around mature trees, which are more prone to suffer than young trees. Ideally, all areas close
to the tree trunk should be kept at original ground level.”
“While most of the marine plants along the foreshore could be avoided, one mangrove [tree number 3 on
the tree survey plan in Appendix D] [Figure 8] requires management of replenishment spoil to minimise
impacts. Two options have been suggested:
1. Replenishment material be place at a depth so that the pneumatophores are not completely
covered (i.e. leave at least 2 cm of the pneumatophores exposed); or
2. Place replenishment material on either side of the tree protection zone of this specimen and
allow natural processes to move the sediment.”
The other mangrove within the impact area [tree number 26 on the tree survey plan in Appendix D] had
no visible pneumatophores at the time of the site inspection and was located within an area subject to
current erosion control measures (i.e. coir logs [Figure 9]”
“The tree protection zones of all other marine plants within the replenishment area along Gympie Terrace
can either be avoided or will benefit from sand replenishment around the root zone.
Many of the Casuarina glauca along Gympie Terrace have had the roots undermined by erosion. Without
replenishment of the sand along this reach of the river, there is a risk these trees will fall [Figure 10]”
While management of only one marine plant (out of 43 marine plants identified), was specified in the Marine
Plants Survey, in order to implement the controls, the limit of works (tree protection zone) needed to be identified
and pegged out prior to works. Given that this DMP is to support an ongoing annual dredging campaign, and
pneumatophore exposure will change over time, it is proposed that prior to dredging a survey of marine plants is
undertaken and any tree protection zones (that require management due to pneumatophore exposure) are to be
pegged out prior to commencement of sand replenishment.
The tree protection zones for T3 (the mangrove currently at risk of impact) is 2.64m (Figure 8). Out of the six
mangroves identified in the marine plants survey, the tree protection zones varied from 0.12m (mangrove
seedlings) to 6.0m (mature plant) (Table 3).
14
Section 17
Table 3. Tree protection zone for mangroves Plant Tree protection zone number (m) T1 6.0 T3 2.64 T26 0.60 T33 0.36 T34 0.12 T35 3.24 In the existing approved drawings for Noosaville Dredging (2004), there were three mangroves identified and a 10m exclusion zone was specified for each plant (Figure 11). Only one of these mangroves was identified in the updated marine plants survey (plant T35). One mangrove was no longer there, and one mangrove was outside of the updated survey area. While plant T35 has a revised tree protection zone of 3.24m, management is not required given no pneumatophores were exposed at the time of survey. Given that pneumatophore exposure is expected to change over time, this highlights the need for regular marine plants surveys and pegging out of tree protection zones prior to each dredging campaign. Figure 8. Grey mangrove T3 at Gympie Terrace foreshore. No replenishment to be undertaken within the tree protection zone (TPZ = 2.64m) for this specimen. 15
Section 18
Figure 9. Mangrove T26 within existing erosion control area (no management required) Figure 10. Gympie Terrace foreshore erosion around tree roots 16
Section 19
International Coastal Management Noosa River 505789mE ~ 7080300mN Fy 505823 E 7080296mN = £ Sif Dredge / Deposition Areq 4 g ion & g 3 4 3 — a a _ LAT J _— / Oe — — \ -——10th__. sase2sime — ~ \ \ 7080269mN 10m ——+} \ =—=— snsren eS \ 0 xg —— 7080205m N AS Retaining Wal oo Figure 11. Previous 10m mangrove exclusion zone on existing approved drawing NRN-A4 a
Section 20
DREDGING & NOURISHMENT- ENVIRONMENTAL ASPECTS, OBJECTIVES
AND PLANNING ACTIONS
As dredging and disposal are occurring at the same time; with dredged material being placed directly onshore,
this section relates to management of both dredging and disposal activities.
WATER QUALITY
The BMT Sediment Sampling Report (2022) indicates that the composition of sand source is shown to be
generally sand (93%), with minor fractions of clay / silt / gravel. Silts and clays have the potential to become
suspended in the water column and create turbid plumes. Tidal flows in this area of the Noosa River are expected
by be <0.5m/s. Tidal plumes are expected to be relatively small as the sediment is predominantly sand. The
dredging activity has been undertaken historically without water quality issues.
The nourishment activity is undertaken concurrently with dredging. The sand is expected to be generally
consistent in colour and grade with the beach that is nourishing. Nourishment area is above LAT and placement
will be on the visible beach above the water level with subsequent reprofiling as required. This will minimise
potential for sediment plumes.
Objective: To minimise impacts of dredging and disposal on water quality.
Issues: Releases of suspended sediment (i.e. turbidity) as part of the dredging activity and placement of
nourishment. Spill of hazardous substances (e.g. fuel or oil) during operations or refuelling.
Performance Criteria: All releases are within permit requirements. No spills or leaks of hazardous substances.
Control Measures:
Responsible
Control Measures
Party
1. Undertake the dredging activity in a manner that minimises the turbid plume as far as practicable. Contractor
2. Implement dredging operational controls as required to ensure water quality requirements are met. This Contractor
may include control of production rates, timing of dredging activity to coincide with more suitable tides
and/or other operational controls.
3. Fuel bunkering to be undertaken by a licenced contractor. Contractor
4. Oils and fuels to be securely stored within designated storage areas. Storage tanks to be either self- Contractor
bunded or bunded with impermeable surfaces and capacity to contain 110% of the largest tank storage
capacity.
5. Undertake the dredging activity and ancillary activities in a manner that minimises the potential for oil, Contractor
grease, scum, litter or other visually objectionable matter to enter the waterways.
6. Oil spill management plan to be implemented. Management Plan to be located on board. Staff are to be Contractor
suitably trained. Suitable oil spill control stations to be located onboard.
7. Plant and equipment is to be clean of silt, pests and other contaminants. Plant to be well maintained. Contractor
Monitoring: Monitoring is to be undertaken in accordance with Table 4.
18
Section 21
NOISE
The Noosa River experiences regular vessel traffic during the day. The foreshore is busy with public amenities
such as parks, pedestrian/ cycling path. The foreshore is also occupied by several restaurants, cafes and other
commercial venues, that will be abutting the dredge/nourishment areas.
By using small dredging plant such as cutter-suction dredger, the noise generated is not expected to be louder
than inherent background noise with a busy waterway.
Objective: To minimise impacts of dredging and disposal works on noise-sensitive receptors.
Issues: Cutter-suction dredger engines and use of spuds for dredge movement are the primary sources of noise
generation.
Performance Criteria: No complaints received.
Control Measures:
Responsible
Control Measures
Party
1. Observe project working hours. Dredging to be limited to Monday - Saturday 6:30am – 6:30pm. No Contractor
dredging work to be undertaken on Sundays or public holidays. Noisy activities are to be scheduled for
the least sensitive times of the day where possible.
2. Noise generated by the activity must not cause environmental nuisance to any sensitive place or Contractor
commercial place.
3. Engines / equipment are to be well maintained at all times in accordance with manufacturer’s Contractor
specifications.
4. Staff to be aware of noise restrictions. Contractor
5. Fit all equipment with mufflers (where applicable) and operate so as to comply with the Environmental Contractor
Protection (Noise) Policy 1997
6. Provide a register to record any noise complaints received. Record details including date, time and Contractor
duration of noise nuisance.
7. In response to a noise complaint, identify the source and check maintenance records to ensure all Contractor
machinery has been maintained. Fit improved noise attenuation (or other appropriate maintenance works)
to any equipment found to be non-compliant with noise standards with and do not use on site until
compliance is achieved.
Monitoring: Monitoring is to be undertaken in accordance with Table 4.
AIR QUALITY, ODOUR AND DUST MANAGEMENT
The dredging works are expected to be undertaken by a single cutter-suction dredger, as such air quality is not
expected to be significantly impacted (i.e. similar to small construction projects).
19
Section 22
As the dredged materials remain wet as it is pumped on-shore, air quality, odour and dust from the material itself
is not anticipated to be a significant issue. Given the nature of the material, odour from the material is not
expected to be a significant issue.
Objective: To minimise impacts of dredging works on air quality.
Issues: Particles, dust and odour generated by dredging equipment & operations.
Performance Criteria: No complaints received.
Control Measures:
Responsible
Control Measures
Party
1. Engines / equipment are to be well maintained at all times in accordance with manufacturer’s Contractor
specifications.
2. Carry out all work and operate all equipment so as to comply with the Environmental Protection (Air) Contractor
Policy 1997 at all times.
3. Staff shall be aware of air quality restrictions. Contractor
Monitoring: Monitoring is to be undertaken in accordance with Table 4.
FLORA AND FAUNA
The dredge area is to maintain a 25m buffer from the designated Noosa River Fish Habitat Area, consistent with
the existing Environmental Authority.
No marine plants are to be impacted due to dredging or nourishment (without obtaining separate approval).
Existing mangroves are present on the Noosa River foreshore. Mangroves have the potential to be impacted by
the uncontrolled placement of sand over root zones. Tree protection zones have been calculated for mangroves
along Hilton Esplanade and Gympie Terrace, although only one of identified marine plants required management
due to exposed pneumatophores. Given that exposure of pneumatophores will change over time, it is proposed
that a marine plants survey is undertaken before each dredging campaign and any mangroves with exposed
pneumatophores be pegged prior to sand replenishment.
Existing trees that are currently being undermined by erosion may be classified as marine plants. It is considered
that sand re-nourishment will generally enhance the survival of any undermined trees and no buffer is required.
Biome (2022) have assessed the marine megafauna likely to be encountered within the Noosa River estuary
(dugong, dolphins and turtles) and they are all capable of foraging in turbid water. Dolphins often stir up bed
sediments when foraging for benthic prey, resulting in limited visibility for prey detection and reliance on
echolocation to detect prey.
Dugongs have poorly developed eyesight and rely on bristles on their upper lip, rather than visual cues, to detect
seagrass food resources. Flatback Turtles are known to feed in turbid shallow waters and may not be directly
20
Section 23
affected by turbid plumes generated by dredging. Other marine turtle species such as Green and Hawksbill Turtle,
which feed on seagrass and/or in reef environments, may avoid areas affected by turbid plumes.
It is expected that marine fauna will avoid the source of underwater noise and their immediate surrounds. Once
operations have been completed, avoidance behaviour is expected to cease.
Objective: To minimise risk of impact of dredging and nourishment works on flora and fauna.
Issues: Injury to marine fauna from vessel strike or dredger operations.
Performance Criteria: No injury to marine mega-fauna. No impact to marine plants except where approved.
Control Measures:
Responsible
Control Measures
Party
1. Beach renourishment is not to cover any exposed mangrove pneumatophores. Marine plants survey to be Contractor
undertaken prior to dredging works and tree protection zone to be pegged out when necessary to avoid
impacts (including when exposed pneumatophores are identified).
2. Seagrasses not to be impacted during dredging. Contractor
3. Beach renourishment is to be undertaken in a manner that does not damage the root systems of any Contractor
undermined trees that are not mangroves. No buffer needs to be observed where there is an expectation
that nourishment will enhance stability.
4. Water quality monitoring to be undertaken in accordance with Table 4. Water quality to be managed in Contractor
accordance with control measures in section 5.1
5. Visual observations shall be undertaken for at least 10 minutes prior to commencement of dredging Contractor
operations and periodically throughout works. Should fauna be observed, operations shall cease until the
spotted animal has moved on.
6. In the event that a marine animal is captured or injured during the course of dredging, DES is to be Contractor
notified (phone 1300 130 372). The incident is to be recorded in the dredge log.
Monitoring: Monitoring is to be undertaken in accordance with Table 4.
LAND
Geotechnical investigations have been undertaken by Soil Survey (2006), BMT (2022) and Pacific Geotech
(2023) (section 4.1.2).
Investigations by BMT (2022) undertaken in accordance with NAGD 2009 (National Assessment Guidelines for
Dredging) for contaminants confirms that sediments are not contaminated and are suitable for onshore disposal.
Testing was undertaken in accordance with QASSIT requirements for acid sulfate soils. While investigations by
BMT (2022) indicate locations with very low levels of potential acid sulfate soils that are not fully offset by the
natural buffering capacity of the soils and one isolated high spot, subsequent testing around the hot spot by
Pacific Geotech (14 November 2022) “confirmed the material initially encountered has either been naturally
21
Section 24
scoured away or is of such an isolated volume so as to not be significant and acid sulfate treatment will not be
required.”
Acid sulfate management of the Noosa River is to be undertaken in accordance with Pacific Geotech
recommendations as follows: “Considering the proposed dredging methodology (ie. use of a cyclone separator)
and the natural buffering capacity of the sands, treatment for the acid sulfate neutralisation is not likely to be
required. This should be confirmed with validation testing at the time of the dredging operation. Validation testing
should be undertaken at a rate of 1 test per 250m3 of disturbed material. … If the validation testing indicates the
material is providing results above 18molH+/tonne (ie. above the action criteria) the material should be neutralised
at the time of dredging”.
Objective: To minimise the impacts of disturbance of soils on the surrounding environment.
Issues: Adverse impacts associated with unexpected sediment types (that may be acidic or contaminated).
Performance Criteria: Compliance with Queensland Acid Sulfate Soils Technical Manual and NAGD (2009).
Control Measures:
Responsible
Control Measures
Party
1. Dredge to be fitted with a cyclone when working in areas that don’t have adequate buffering capacity Contractor
2. Nourishment to consist of suitable sandy sediments ONLY. Dredged sediment to be monitored. In the Contractor
event that sediment types that are unsuitable for nourishment or are indicative of acid sulfates or
contaminated sediment, dredging is to cease or move to an adjacent area.
3. Acid sulfate validation testing to be undertaken at a rate of 1 test per 250m3 of disturbed material. Contractor
In the event that the validation testing indicates the material is providing results above 18molH+/tonne (i.e.
above the action criteria) a geotechnical expert is to be consulted and material is to be neutralised at the
time of dredging”
Monitoring: Monitoring is to be undertaken in accordance with Table 4.
CULTURAL HERITAGE
The dredge and nourishment area has historically been dredged and used for re-nourishment. Given the level of
previous disturbance, it is considered unlikely that items of indigenous cultural heritage significance are present.
Noosa River Caravan Park, Heritage Impact Statement (HIS)
The Noosa River Caravan Park at Munna Point is listed on the Queensland Heritage Register. This site already
has existing approvals for dredging and beach re-nourishment that were obtained during Munna Point Groyne
works.
The closest nourishment works are 2m seaward of an existing building and 3m seaward of camp sites (Figure
12); however, an existing geotextile container retaining wall separates the nourishment area and caravan park at
this location.
22
Section 25
Only the beach area, seaward of the heritage place will be impacted by the dredging and nourishment works. The dredging and nourishment work at this location will increase beach width and reduce the impact of erosion, protecting the caravan and tent sites. The works are considered to have no adverse impact on the heritage site and will provide benefit in maintaining an erosion buffer. Beach access can remain open to the public while nourishment works are undertaken. Figure 12. Location of works adjacent Noosa River Caravan Park Figure 13. Munna Point foreshore, eastern side 23
Section 26
Figure 14 Munna Point foreshore, boat ramp Figure 15. Munna Point foreshore, SFGC groynes and timber retaining wall Figure 16. Munna Point foreshore, northern side / Weyba Creek entrance. 24
Section 27
Objective: To minimise impacts of the works on items of cultural or heritage significance.
Issues: No impacts expected.
Performance Criteria: No disturbance of cultural heritage items.
Control Measures:
Responsible
Control Measures
Party
1. If items are identified that potentially have cultural significance, immediately notify Traditional Owners and Contractor
seek advice.
2. Dredging and nourishment activities at Munna Point Caravan Park to be undertaken in a manner that Contractor
minimises impacts on visual and recreational aesthetics during the works.
3. Public access to be maintained to the foreshore during the works. Contractor
4. On completion, nourishment to form a natural profile and not present safety hazards to users. Contractor
Monitoring: Monitoring is to be undertaken in accordance with Table 4.
WASTE
Dredged sediments are not considered to be waste.
The dredging activity generates wastes, including general rubbish and hazardous wastes.
Objective: To minimise impact of waste generated by the dredging works.
Issues: Release of waste to receiving waters.
Performance Criteria: No loss of waste overboard. No unsuitable disposal of waste.
Control Measures:
Responsible
Control Measures
Party
1. No garbage to be thrown overboard or into the environment. Materials and equipment is to be secured to Contractor
prevent accidental loss overboard, particularly during inclement weather. If garbage accidently ends up in
the water, it is to be retrieved.
2. Waste bins are to have secure lids, be appropriately sized and be disposed of regularly to a suitable Contractor
facility onshore. Waste to be recycled where possible.
3. Hazardous wastes must be stored in an appropriate and secure manner with collection and transport by a Contractor
licenced Contractor.
4. On completion of the works, inspect and remove any waste generated as a result of the works. Contractor
25
Section 28
5. Refueling to be undertaken at an approved facility or in calm waters with the vessel moored alongside a Contractor
suitable area under the supervision of the Engineer.
6. Oil spill management plan to be implemented. Management Plan to be located on board. Staff are to be Contractor
suitably trained. Suitable oil spill control stations to be located onboard.
7. Suitable amenities to be provided onshore. Contractor
8. Major repair and maintenance not to be undertaken on site. Contractor
Monitoring: Monitoring is to be undertaken in accordance with Table 4.
26
Section 29
OPERATION
OPERATIONAL PLANNING AND CONTROL
The Contractor will establish, implement, control and maintain the processes needed to meet environmental
management system requirements and to implement the actions identified in Section 5.
Environmental requirements are to be clearly communicated to subcontractors and external providers as
appropriate.
EMERGENCY PREPAREDNESS AND RESPONSE
Oil Spill
An oil spill management plan is to be prepared by the Contractor and implemented throughout the works.
Incident Reporting
Any marine incidents are to be reported by the Contractor as required by the relevant legislation.
27
Section 30
PERFORMANCE EVALUATION
MONITORING, MEASUREMENT, ANALYSIS AND EVALUATION
General
An environmental monitoring program is to be implemented for the duration of the dredging works to ensure that
the requirements of this Concept Dredge Management Plan and the Contractor’s Site-Specific Environmental
Management Plan are being met. The environmental monitoring methods, frequency and timing, analysis and
evaluation against performance criteria and party responsible for implementing the monitoring are outlined in
Table 4. Results of monitoring that is the responsibility of the Dredging Contractor are to be recorded on the daily
log sheet.
All monitoring, recording and interpreting of parameters are to be undertaken by appropriately qualified persons in
accordance with the requirements of the approval conditions. Where necessary, calibrated equipment that is
properly maintained and suitable for the purpose is to be utilised in a manner consistent with relevant guidelines
and best practice.
The Approval Holder is required to store site-specific environmental monitoring records for a minimum of 5 years
during which period they are to be provided to the administering authority upon request.
Complaints
It is an objective of the project to respond to, investigate and resolve any non-vexatious complaints received
within 24-48 hours.
Details of complaints are to be recorded in a complaint register, recording the details below.
• Date and Time the complaint was received.
• Name and contact details of the complainant.
• Nature of the complaint.
• Investigations undertaken.
• Conclusions formed.
• Actions taken.
Evaluation of Compliance
Analysis and evaluation shall be performed promptly after each monitoring event and any non-conformances
promptly communicated appropriately as such that corrective action can be undertaken if required and the
monitoring frequency adjusted accordingly.
28
Section 31
International Coastal Management 2S
Section 32
Table 4: Environmental Monitoring Requirements
Issues Monitoring Method Frequency/Timing Performance Criteria Responsibility
Water Quality Visual inspection Daily during dredging Visible plume does not extend more than 100m from the dredge area or nourishment Contractor
outlet.
No visible oil, grease, scum, litter, visually objectionable matter or other unapproved
contaminant.
Noise Aural inspection of equipment (dredge Daily during dredging Noise levels consistent with equipment specifications. Contractor
and booster pumps) for excessive noise
Investigation of noise complaints in Within 14 days of Investigation of noise complaints in accordance with permit requirements. Contractor
accordance with permit requirements. complaint
Air quality Visual inspection. Daily during works No excess machinery exhaust. Contractor
Flora / Fauna Visual inspection Daily during works Visual observations for marine mega-fauna shall be undertaken for at least 10 minutes Contractor
prior to commencement of dredging operations and periodically throughout works.
No injured marine mega-fauna or impact to marine plants.
Land Visual inspection Daily during works No unsuitable sediment to be placed as beach nourishment. Contractor
Acid sulfate validation testing 1 test per 250m3 Results below 18molH+/tonne Contractor
Cultural Heritage Visual inspection. Daily during works Any cultural heritage items identified to be notified appropriately. Contractor
Visual inspection Daily during works Maintains safe public access, recreational usage and natural profile of the foreshore Contractor
throughout works and on completion.
Waste Visual inspection Daily during works No uncontained litter/waste from plant associated with the works. Contractor
management
Complaints Complaint Register. As required. Complaints responded to within 24-48 hours and all complaints investigated and Principal
resolved.
30
Section 33
INTERNAL AUDIT
The Contractor’s site-specific management plan is to detail any internal auditing processes.
MANAGEMENT REVIEW
The Contractor’s site-specific management plan is to detail any ongoing management review.
31
Section 34
IMPROVEMENT
NON-CONFORMITY AND CORRECTIVE ACTION
This Concept Dredge Management Plan has outlined areas of environmental management for the works. If
ongoing monitoring of the works identify areas of non-conformance with the requirements of this Concept Dredge
Management Plan, the Contractor shall (where possible, safe and appropriate):
a) React to the Non-Conformity.
1) Take Corrective Action to control and correct it.
2) Deal with the consequences, including mitigating actual adverse environmental impacts.
3) Initial Communication of the Non-conformity
b) Evaluate the need for action to eliminate the causes of the nonconformity.
1) Review the nonconformity.
2) Determine the causes of the nonconformity.
3) Determine if similar nonconformities exist or could potentially occur.
c) Implement any preventative action needed.
d) Review the effectiveness of any corrective action undertaken.
e) Make changes to the environmental system, if necessary.
Communication of the issue to the approval holder (Noosa Shire Council) is required as soon as practicable if the
Non-Conformity included any of the following:
o A complaint regarding any environmental impact caused by the works is received.
o A departure from approved procedure is observed.
o Non-compliance with performance criteria.
o Major non-conformance with management plan.
Notification of agencies is to be undertaken where required.
CONTINUAL IMPROVEMENT
The Contractor shall continually improve the suitability, adequacy and effectiveness of the environmental
management system to enhance environmental performance.
32
Section 35
DRAWINGS
Relevant project drawings
Drawing No. Drawing Title Revision Date
NRD-000 Title Page 1 27-01-23
NRD-001 Scheme of works 1 27-01-23
NRD-002 Typical Section 1 27-01-23
NRD-003 Plan 1 1 27-01-23
NRD-004 Plan 2 1 27-01-23
NRD-005 Plan 3 1 27-01-23
NRD-006 Plan 4 1 27-01-23
NRD-007 Plan 5 1 27-01-23
NRD-008 Plan 6 1 27-01-23
A-1
Section 36
LOCALITY PLAN
SITE NOOSA
International
HEADS
Coastal
Management NOTES
NOOSA RIVER DREDGING
NOOSA SHIRE COUNCIL
SCHEDULE OF DRAWINGS
DRAWING No. DRAWING TITLE DATE REVISION No.
NRD-000 Title Page 27/01/2023 1
NRD-001 Scheme of Works 27/01/2023 1
NRD-002 Typical Section 27/01/2023 1
NRD-003 Plan 1 27/01/2023 1
NRD-004 Plan 2 27/01/2023 1
NRD-005 Plan 3 27/01/2023 1
NRD-006 Plan 4 27/01/2023 1
NRD-007 Plan 5 27/01/2023 1
NRD-008 Plan 6 27/01/2023 1
NRD-009 Existing Approvals 27/01/2023 1
VERTICAL DATUM: - HORIZONTAL DATUM: -
REVISION REGISTER
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
WEBSITE www.coastalmanagement.com.au
PROJECT NAME
Noosa River Dredging
DRAWING TITLE
Title Page
DRAWING No. REVISION:
NRD-000 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 37
LOCALITY PLAN
SITE
NOOSA
HEADS
25
NOOSAVILLE
Noosa River Fish Habitat Area
25
NOTES
25
Drawin
g NRD
T34
T36
T35T33
T35
T33 T37
COPSE
37
OPSE 1
T4
T42
COPSE
OPSE 2
T43
43
-008
07
D-0
NR
wing
Dra Noosa River Caravan
T1
505783 mE
7080270 mN T3
T2 T9-T11
T5 T24 T26 T27 T30 T32
T7
T23 T25 T31
T4 T6 T8 T19 T21 T28 T29
T12
T17 T22
T18 T20
T13-T16
Park Heritage Area
Drawin
g NRD
-003
006
RD-
Drawing NR ing N
D-004 Draw
Drawing NR
D-005
0 320
160
Meters
Existing Vegetation
LAT
MHWS
GENERAL NOTES Extent of Works Fish Habitat Area
Extent
SCOPE OF WORKS Seaward Work
1. Dredging and nourishment up to maximum 10,000 tonnes Area Extent
2. Dredging undertaken periodically as required. Fish Habitat Area
3. No works within private lease jetty areas. 25m Buffer
4. No works within 25m of Noosa River Fish Habitat Area. Nourishment
5. No marine plants to be disturbed without approval. (Profile Type 2)
6. Works at Munna Point are in the Noosa River Caravan Park Heritage Area
Nourishment
Landward Extent
DESIGN BASIS Noosa River Caravan
7. Localised erosion occurs due to natural coastal processes and boat wakes. This impacts foreshore amenity, vegetation, parkland and Park Heritage Area
infrastructure. Dredge Area 1
8. Current approvals exist for dredge and nourishment, but these focus on historic sand shoals and erosion hotspots (refer drawing NRD-009). (-4.0m AHD max depth)
9. The Noosa River is dynamic. Shoals have migrated and additional areas require nourishment.
Dredge Area 2
10. The proposed works provide a more flexible approach for the Noosa River southern foreshore from Hilton Esplanade to Weyba Creek. This
(-2.5m AHD max depth)
will allow Noosa Shire Council to manage dredging and nourishment activities in response to changing conditions.
Nourishment Area
DESIGN CONDITIONS
11. Tide Levels from Queensland Tide Tables 2022 [Munna Point]. VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
HAT +0.63m AHD REVISION REGISTER
MHWS +0.34m AHD - - - - - -
MLWS -0.28m AHD - - - - - -
LAT -0.42m AHD
- - - - - -
12. Bathymetric survey by HydraLogic (25/06/2019).
13. Aerial images from Nearmap dated 17/04/2020. - - - - - -
- - - - - -
DREDGING & NOURISHMENT
1 27.01.23 Initial Issue MM BC AJ
14. All measurements in metres. Dimensions not to be scaled.
DESCRIPTION
15. Dredging is to be undertaken in accordance with the Noosaville Concept Dredge management Plan (ICM, 2023). REV.NO. DATE BY ENG. APP.
16. Material is to be sand suitable for nourishment. Any unsuitable material encountered is not to be placed on the foreshore.
17. Dredging to be undertaken with suitable plant (e.g. small cutter suction dredger with cyclone). International
18. Dredge areas are to target shoals in close proximity to the nourishment area and minimise dredge depth by targeting shoals.
19. Dredging is to target uniform extraction across wide area (i.e. avoid digging holes).
Coastal
20. Nourishment profile is to be consistent with natural foreshore profiles and transition smoothly to the existing profile at the works extent. Management
21. Beach renourishment is not to cover any exposed mangrove pneumatophores. Marine plats survey to be undertaken prior to dredging works OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
and tree protection zone to be pegged out when necessary to avoid impacts (including when exposed pneumatophores are identified). POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
22. Acid sulfate validation testing to be undertaken at a rate of 1 test per 250m³ of disturbed material. In the event that the validation testing WEBSITE www.coastalmanagement.com.au
indicates the material is providing results above 18molH+/tonne (i.e. above the action criteria) a geotechnical expert is to be consulted and
material is to be neutralised at the time of dredging. PROJECT NAME
Noosa River Dredging
MONITORING & MAINTENANCE DRAWING TITLE
23. Foreshore to be monitored periodically, including post-storm events.
24. Dredging to be undertaken as required in response to erosion. Scheme of Works
25. Monitoring of dredging activities to be undertaken in accordance with the Noosaville Concept Dredge management Plan (ICM, 2023). DRAWING No. REVISION:
NRD-001 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 38
LOCALITY PLAN
Nourishment Area
LAT > 9m Profile change from 1V:5H (min) to 1V:4H at LAT. SITE
NOOSA
Dredging profile below LAT. HEADS
Design Profile.
2m
See note 2. Existing Profile
NOOSAVILLE
RL +1m AHD 1V:5H
(min)
MHWS
NOTES
LAT 1. For general notes see NRD-001.
2. Design beach profile to slope at 1V:5H
1V:4 minimum. Profile may be flatter where
0 5 H suitable and existing distance to LAT allows,
2.5
Meters but flatter slope should not extent beyond
Dredge Area 2 Design Depth RL -2.0m AHD LAT. Final nourishment profile to provide
Dredge Area 2 Maximum Depth RL -2.5m AHD adequate navigation access in proximity to
jetties, pontoons & ramps.
Typical Section (Type 1) for wider beach (Distance to LAT >9m) Dredge Area 1 Design Depth RL -3.5m AHD 3. If minimum design beach profile (1V:5H)
Dredge Area 1 Maximum Depth RL -4.0m AHD slope does not intersect with beach at LAT,
Flatter nourishment slope may be adopted where suitable batter to extend below LAT at 1V:4H slope.
Dredging below -2.5m AHD
in Dredge Area 1 only
Profile change from 1V:5H to 1V:4H at LAT.
Nourishment profile continues NSL intersection
below LAT.
LAT < 9m
2m Nourishment Area Existing Profile
Design Profile.
RL +1m AHD
See note 3.
1V:5H
(min)
MHWS
LAT
1V:4
H
Dredge Area 2 Design Depth RL -2.0m AHD
Dredge Area 2 Maximum Depth RL -2.5m AHD
0 5 1V:4
2.5
H
Meters
Dredge Area 1 Design Depth RL -3.5m AHD Nourishment
Dredge Area 1 Maximum Depth RL -4.0m AHD (Profile Type 2)
Tidal Plane
Typical Section (Type 2) for narrower beach (Distance to LAT < 9m) Dredging below -2.5m AHD
Dredge Area 1
(-4.0m AHD max depth)
Nourishment extents below LAT as required. in Dredge Area 1 only Dredge Area 2
(-2.5m AHD max depth)
Nourishment Area
VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
REVISION REGISTER
- - - - - -
- - - - - -
Nourishment Dredge Fish Habitat Area - - - - - -
Area Area 25m Buffer Fish Habitat Area - - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
MHWS OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
LAT Dredge Area 2 Design Depth RL -2.0m AHD POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
Dredge Area 2 Maximum Depth RL -2.5m AHD WEBSITE www.coastalmanagement.com.au
Dredge Area 1 Design Depth RL -3.5m AHD PROJECT NAME
Dredge Area 1 Maximum Depth RL -4.0m AHD Noosa River Dredging
0 15 DRAWING TITLE
7.5
Meters Dredging below -2.5m AHD Typical Section
in Dredge Area 1 only DRAWING No. REVISION:
NRD-002 1
Typical Section (Type 1, cross-section extent) DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 39
LOCALITY PLAN
SITE
NOOSA
HEADS
NOOSAVILLE
NOTES
1. For general notes see NRD-001 &
NRD-002.
Ch:548
NADE
ESPLA
Ch:25
HILTON
Ch:12
HILTON ESPLANADE HILTON ESPLANADE
5
0
0 60
30
Meters
211
808
HI MCH2
EET
ET
LT
O
Existing Vegetation
LAT
MHWS
Fish Habitat Area
Extent
Fish Habitat Area
25m Buffer
Seaward Work Area Extent
Nourishment
(Profile Type 2)
Nourishment
Landward Extent
Dredge Area 1
(-4.0m AHD max depth)
Nourishment Area
VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
REVISION REGISTER
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
WEBSITE www.coastalmanagement.com.au
PROJECT NAME
Noosa River Dredging
DRAWING TITLE
Plan 1
DRAWING No. REVISION:
NRD-003 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 40
LOCALITY PLAN
SITE
NOOSA
HEADS
NOOSAVILLE
NOTES
1. For general notes see NRD-001 &
NRD-002.
100
SP20811
168
SP177646
Ch:548
Ch:1130
SPLANADE
Ch:820
167
NADE
SP223758
N ESPLA
0 60
30
Meters
501
165 RP839229
5
Existing Vegetation
LAT
MHWS
Fish Habitat Area
Extent
Seaward Work Area Extent
Nourishment
(Profile Type 2)
Nourishment
Landward Extent
Dredge Area 1
(-4.0m AHD max depth)
Dredge Area 2
(-2.5m AHD max depth)
Nourishment Area
VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
REVISION REGISTER
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
WEBSITE www.coastalmanagement.com.au
PROJECT NAME
Noosa River Dredging
DRAWING TITLE
Plan 2
DRAWING No. REVISION:
NRD-004 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 41
LOCALITY PLAN
SITE
NOOSA
HEADS
NOOSAVILLE
NOTES
1. For general notes see NRD-001 &
NRD-002.
161
163 162 SP260155
100 164 CP907408 CP907407
SP208113 CP907410
151
166 SP284457
151
Ch:1540
7
MCH83921 SP284457
0 60
30
Meters
ACE
GYMPIE TERR GYMPIE TERRACE
1
Existing Vegetation
LAT
MHWS
Fish Habitat Area
Extent
Seaward Work Area Extent
Nourishment
(Profile Type 2)
Nourishment
Landward Extent
Dredge Area 2
(-2.5m AHD max depth)
Nourishment Area
VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
REVISION REGISTER
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
WEBSITE www.coastalmanagement.com.au
PROJECT NAME
Noosa River Dredging
DRAWING TITLE
Plan 3
DRAWING No. REVISION:
NRD-005 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 42
LOCALITY PLAN
SITE
NOOSA
HEADS
NOOSAVILLE
NOTES
1. For general notes see NRD-001 &
NRD-002.
162
9074
07 16
SP2 1 16
6015
5 CP9 0
0864
9
17
SP2 2
8445
171 7
Ch:2350
15 15
SP2 1 SP2 1 SP2
8445
8445 6 8445
15 7 MCH 9 7 7
SP2 1
Ch:2000
0 60
30
2776 RRACE
Meters 8445
7 GYMPIE TE
RRACE
GYMPIE TE
Existing Vegetation
LAT
MHWS
Fish Habitat Area
Extent
Seaward Work Area Extent
Nourishment
(Profile Type 2)
Nourishment
Landward Extent
Dredge Area 2
(-2.5m AHD max depth)
Nourishment Area
VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
REVISION REGISTER
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
WEBSITE www.coastalmanagement.com.au
PROJECT NAME
Noosa River Dredging
DRAWING TITLE
Plan 4
DRAWING No. REVISION:
NRD-006 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 43
LOCALITY PLAN
SITE
NOOSA
HEADS
NOOSAVILLE
NOTES
1. For general notes see NRD-001 &
NRD-002.
CP 159
901
988
SP 151
284
457
E SP 157 Existing Vegetation
TERRAC 143
Ch:3100
GYMPIE 417 LAT
Ch:2780
0 60
E
30
GYM PIE TERR ACE
Meters GYMPIE TERRAC
MHWS
WILLI
Fish Habitat Area
RUS
Extent
Seaward Work Area Extent
Nourishment
(Profile Type 2)
Noosa River Caravan
Park Heritage Area
Nourishment
Landward Extent
Dredge Area 2
(-2.5m AHD max depth)
Nourishment Area
VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
REVISION REGISTER
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
WEBSITE www.coastalmanagement.com.au
PROJECT NAME
Noosa River Dredging
DRAWING TITLE
Plan 5
DRAWING No. REVISION:
NRD-007 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 44
LOCALITY PLAN
SITE
NOOSA
HEADS
NOOSAVILLE
NOTES
1. For general notes see NRD-001 &
NRD-002.
Ch:35
00
Ch:3585
Ch
:31
00
MUNN
A CRE
SCEN
T
131
417 Existing Vegetation
SP143
0 60 157 LAT
30
417
Meters
SP143 MHWS
Seaward Work Area Extent
Nourishment
(Profile Type 2)
Noosa River Caravan
Park Heritage Area
Nourishment
Landward Extent
Dredge Area 2
(-2.5m AHD max depth)
Nourishment Area
VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
REVISION REGISTER
- - - - - -
- - - - - -
- - - - - -
- - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
WEBSITE www.coastalmanagement.com.au
PROJECT NAME
Noosa River Dredging
DRAWING TITLE
Plan 6
DRAWING No. REVISION:
NRD-008 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 45
LOCALITY PLAN
SITE
NOOSA
HEADS
NOOSAVILLE
NOTES
1. For general notes see NRD-001 &
NRD-002.
Existing Section 86 Permit
Existing Approved
Area 1
Existing Approved
T34
T35
T36
T33 T37
COPSE 1
T42
COPSE 2
T43
Area 2
Existing Section 86 Permit
Existing Approved
Existing Approved Area
Area 6 T1
505783 mE
7080270 mN
T2
T3
T4
T5
T6
T7
T8
T12
T9-T11
T19 T21
T23
T24
T25
T26 T27 T30 T32
T28 T29
T31
Existing Approved
T17 T22
T18 T20
T13-T16
Existing Vegetation
Area 3
LAT
Existing Approved Existing Approved MHWS
Area 5 Area 4
Seaward Work Area Extent
Nourishment
Landward Extent
VERTICAL DATUM: AHD HORIZONTAL DATUM: GDA94/56
REVISION REGISTER
0 320 - - - - - -
160
Meters
- - - - - -
- - - - - -
- - - - - -
- - - - - -
1 27.01.23 Initial Issue MM BC AJ
REV.NO. DATE DESCRIPTION BY ENG. APP.
International
Coastal
Management
OFFICE 50 / G Arm, SYC Marina, Main Beach, 4217, QLD, Australia
POST PO Box 306, Main Beach LPO, Main Beach QLD, 4217, Australia
TELEPHONE +61 7 55640564 FAX +61 7 55329147
WEBSITE www.coastalmanagement.com.au
PROJECT NAME
Noosa River Dredging
DRAWING TITLE
Existing Approvals
DRAWING No. REVISION:
NRD-009 1
DRAWN : MM CHECKED : BC APPROVED : AJ
RPEQ 2876
SIZE: A3 SCALE : As shown DATE : 27 Jan, 2023
Section 46
APPROVALS
Relevant project approvals
Permit Type Permit Number
Operational Works Permit TBA
Environmental Authority TBA
B-1
Section 47
International Coastal Management Appendix C. GEOTECHNICAL INVESTIGATIONS C-1
Section 48
ACID SULFATE SOIL REPORT: Noosa River Dredging Program
Noosa River
Noosa
International Coastal Management
January, 2023
PG-5412
VERSION 3
Section 49
Ref: PG-5412, 2022-11-03, GR VER 3
Author: Peter Elkington
27th January, 2023
International Coastal Management
Email: [email protected] /
[email protected]
ATTENTION: MARTY MULCAHY & BOBBIE CORBETT
Dear Sir,
ACID SULFATE SOIL INVESTIGATION – NOOSA RIVER DREDGING PROGRAM
NOOSA RIVER, NOOSA
Enclosed is a copy of our report for the above project dated January, 2023. An
electronic copy of the report has been issued. This investigation has been undertaken
to supplement the current investigation undertaken for the area that indicated a hot
spot of acid sulfate soils in the area.
Additionally, a deep borehole was drilled adjacent the original borehole (BH01) that
had met refusal above the proposed excavation depth.
Should you have any queries regarding this report, please do not hesitate to contact
Peter Elkington at this office.
Yours faithfully,
P. ELKINGTON (RPEQ 7226)
For and on behalf of
PACIFIC GEOTECH PTY LTD
[email protected]
www.pacgeo.com.au
Section 50
TABLE OF CONTENTS
1.0 INTRODUCTION ................................................................................................... 1
2.0 METHODOLOGY .................................................................................................. 1
3.0 SITE DESCRIPTION................................................................................................ 1
4.0 GEOLOGICAL MODEL ........................................................................................ 2
5.0 LABORATORY TESTING........................................................................................ 3
6.0 ACID SULFATE SOIL LABORATORY TESTING...................................................... 3
7.0 LIMITATIONS ........................................................................................................ 5
Appendices
Appendix A
Notes relating to this report
Appendix B
Borehole Record Sheets
Appendix C
Laboratory Test Certificates
Appendix D
Site Plan
Appendix E
BMT - Noosa River Sediment Sampling Report
Section 51
Project No. PG-5412 Page | 1
January, 2023
Ref: PG-5412, 2022-11-03, GR VER 3
International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa
1.0 INTRODUCTION
This report contains the results of the acid sulfate soil investigation by Pacific Geotech.
The work has been undertaken to further assess a potential acid sulfate hot spot
encountered during the original investigation for the current dredging work.
2.0 METHODOLOGY
The investigation comprised the sampling of 6 boreholes using Piston Sampling
techniques from a custom spud legged work boat and 2 boreholes to depths of 6m
advanced from the work boat using driven split tube sampling equipment.
An additional borehole was drilled from the beach to a depth of 6.0m, adjacent the
BH01 to confirm the soil profile at depth.
The boreholes were located by an experienced geotechnical engineer and locations
were recorded using a hand held GPS.
The soil classification descriptions and field tests were carried out in general
accordance with Australian Standards.
AS 1726 Geotechnical Site Investigations
QASSIT Queensland Acid Sulfate Soil Investigation
Team Dept. of Natural Resources, 'Guidelines
for Sampling and Analysis of Lowland Acid
Sulfate Soils (ASS) in Queensland, 1998' (Oct.
1998, Revision 4.0).
QUEENSLAND State Planning Policy Guideline, December
GOVERNMENT 2013, Acid Sulfate Soils
Borehole records and a site plan showing the test locations are appended to the
report.
The boreholes were sampled for acid sulfate purposes, in addition to geotechnical
sampling. Sampling of the surficial sediments were recovered from a series of the
boreholes, to allow analytical testing of the samples to determine the potential acid
sulfate content.
3.0 SITE DESCRIPTION
The site of the investigation is located within the Noosa River, Noosa.
The area under consideration is immediately adjacent a public boat ramp and is
adjacent the southern bank of the Noosa River.
Refer following aerial image of the location.
Section 52
Project No. PG-5412 Page | 2
January, 2023
Ref: PG-5412, 2022-11-03, GR VER 3
International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa
AERIAL IMAGE
4.0 GEOLOGICAL MODEL
The subsurface profile encountered in the boreholes generally consisted of sand to
the borehole termination depths. Within the sand profile some layers of silty/clayey
sand were noted, particularly adjacent the stormwater outlet from the adjacent park.
The sand was described as very loose in density. Very soft silty/sandy clays were noted
in Boreholes 1 and 1A under an upper-level sands.
Section 53
Project No. PG-5412 Page | 3
January, 2023
Ref: PG-5412, 2022-11-03, GR VER 3
International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa
5.0 LABORATORY TESTING
Testing was carried out on selected samples retrieved from the site investigation
program and was directed towards assessing the testing for acid sulfate presence in
the area previously identified as a hot spot.
Testing was undertaken by Pacific Geotech.
Laboratory testing included:-
• pH/pHfox testing – screening tests to qualitatively assess the acid sulfate soil
potential of the soils.
• Chromium Suite testing – qualitative testing of the acid sulfate soils.
The results of the laboratory testing are presented in Appendix C.
Additionally, historical testing was undertaken for the works as part of the Noosa River
– Sediment Sampling Plan Report by BMT dated 14th April, 2022.
The results of this provided testing are appended to this report.
6.0 ACID SULFATE SOIL LABORATORY TESTING
Laboratory testing was undertaken in general accordance with the
recommendations outlined in the QASSIT 'Acid Sulfate Soils Laboratory Methods
Guidelines 2004'. The results of the testing program are appended to this report.
The testing program comprised of initial screening tests on recovered samples,
followed by quantitative testing using the Chromium Reducible Sulfur (CRS) suite.
Screening Tests
Screening tests were undertaken on each soil sample collected from the bores. Two
small sub-samples of each soil sample were prepared; one sub-sample from each
sample was mixed with approximately 20mL of distilled water, and the other sub-
sample mixed with approximately 20mL of hydrogen peroxide (H2O2), buffered to a
pH of 5.4 with sodium hydroxide.
Slurry pHs were measured with a calibrated pH meter. The pH of the distilled water/soil
slurry (pHF) was measured approximately one hour after mixing, whilst the pH of the
hydrogen peroxide/soil slurry (pHFOX) was measured approximately one to two hours
after mixing.
The pH screening tests can be used for the preliminary identification of a potential or
actual ASS using a combination of three trigger factors as follows:
a) The strength of the reaction with peroxide is a useful indicator but cannot be
used alone. Organic matter and other soil constituents such as manganese
oxides can also cause a reaction.
Section 54
Project No. PG-5412 Page | 4
January, 2023
Ref: PG-5412, 2022-11-03, GR VER 3
International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa
b) A pHFOX value at least one unit below pHF may indicate a potential ASS. The
great the difference between the two measurements, the more indicative the
value is of a potential ASS. The lower the final pHFOX value the better the
indication of a positive result.
c) If the pHFOX is less than 3, and the other two conditions apply, then it strongly
indicates a potential ASS. The more the pHFOX drops below 3, the more positive
the presence of sulfides.
Chromium Suite Analysis
Chromium suite analysis was undertaken to quantify existing soil acidity and potential
future acid generation from possible ASS. A summary of results is given in Table 1.
TABLE 1 CHROMIUM SUITE TESTING SUMMARY
Nett Acidity (incl. AMC) Liming Rate
BH No. Depth (m)
(mol H+/t) (kg CaCO3/t)
0.0-0.2 <1 Nil
08
0.6-1.2 <1 Nil
0.0-0.3 <1 Nil
08.1
0.5-1.0 <1 Nil
0.0-0.2 <1 Nil
08.2
0.6-1.2 <1 Nil
0.0-0.25 <1 Nil
0.8.3
0.5-1.1 <1 Nil
0.2-0.8 <1 Nil
08.4
1.0-1.6 <1 Nil
0.0-0.2 <1 Nil
08.5
0.4-0.8 <1 Nil
The results of the original testing indicated minimal levels of TAA (actual acidity),
low/minor levels of CRS (potential acidity) and in the main, significant levels of ANC
(soil buffering capacity).
These results were generally consistent with the results of the retesting at the hot spot
identified at BH08.
The results of the earlier laboratory testing have been reviewed. Considering the
proposed dredging methodology (ie. use of a cyclone separator) and the natural
buffering capacity of the sands, treatment for the acid sulfate neutralisation is not
likely to be required. This should be confirmed with validation testing at the time of
the dredging operation. Validation testing should be undertaken at a rate of 1 test
per 250m3 of disturbed material.
If the validation testing indicates the material is providing results above 18molH+/tonne
(ie. above the action criteria) the material should be neutralised at the time of
dredging in accordance with the existing soil management plan.
Section 55
Project No. PG-5412 Page | 5 January, 2023 Ref: PG-5412, 2022-11-03, GR VER 3 International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa Summary On the basis of the testing undertaken, all samples provided nett acidity values below the QASSIT defined action criteria. Therefore, soils disturbed on-site do not require treatment for acid sulfate potential. The results of the laboratory testing are appended to this report. The initial testing indicated an acid sulfate hot spot in the area of BH08. This additional testing has confirmed the material initially encountered has either been naturally scoured away or is of such an isolated volume so as to not be significant and acid sulfate treatment will not be required. It is possible that the material was related to sediment build-up at the outlet of the stormwater drain but this is not considered to be an issue now. 7.0 LIMITATIONS We have prepared this report for the Noosa River Dredging Program at Noosa River, Noosa. The report is provided for the exclusive use of International Coastal Management, for this project only and for the purposes outlined in the report. It should not be used by, or relied upon, for other projects on the same or different sites or by a third party. In preparing this report, we have relied upon information provided by the client or their agents. The results are indicative of the subsurface conditions on site only at the specific testing locations. Subsurface conditions can change between test locations and the design and construction should take the spacing of the testing and testing methods adopted and the potential for variation between the test locations. This is not to reduce the level of responsibility accepted by Pacific Geotech, but rather to ensure that the parties who may rely on the information contained in this report are aware of the responsibilities they assume in doing so. P. ELKINGTON (RPEQ 7226) For and on behalf of PACIFIC GEOTECH PTY LTD
Section 56
Project No. PG-5412
January, 2023
Ref: PG-5412, 2022-11-03, GR VER 3
International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa
APPENDICES
Section 57
Project No. PG-5412
January, 2023
Ref: PG-5412, 2022-11-03, GR VER 3
International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa
APPENDIX A
NOTES RELATING TO THIS REPORT
Section 58
Notes Relating to this Report
Reports other particles present (e.g. sandy clay) as set
out below:
The report has been prepared by qualified
personnel, is based on the information Soil
Particle Size
obtained from field and laboratory testing, and Classification
has been undertaken to current engineering Clay less than 0.002mm
standards of interpretation and analysis. Silty 0.002 to 0.06mm
Sand 0.06 to 2mm
Gravel 2 to 60mm
Every care has been taken with the report as it
relates to interpretation of subsurface
Non-cohesive soils are classified on the basis of
conditions, discussion of geotechnical
relative density which can be correlated from
conditions and contains recommendations or
the results of Standard Penetration Test (SPT) as
suggestions for design and construction.
below:
However, unexpected variations in ground
conditions will occur. The potential for this will
SPT ‘N’ Value
depend partly on testing, spacing and Relative Density
(blows/300mm)
sampling frequency. Very Loose less than 4
Loose 4 – 10
If variations are identified, Pacific Geotech Medium Dense 10 – 30
would be pleased to assist with additional Dense 30 – 50
investigations or advice to resolve the matter. Very Dense greater than 50
Copyright Cohesive soils are classified on the basis of
strength (consistency) and can be quantified
This report is the property of Pacific Geotech by the Pocket Penetrometer test, Vane Shear
Pty Ltd. The report may only be used for the test, laboratory testing or engineering
purpose for which it was commissioned and in examination. The strength terms are defined as
accordance with the Terms of Engagement of follows:
proposal. Unauthorised use of this report is
prohibited. Unconfined Compressive
Classification
Strength kPa
Borehole and Test Pit Logs Very Soft less than 25
Soft 25 - 50
The borehole and test pit logs presented in this Firm 50 – 100
report are an engineering and/or geological Stiff 100 – 200
interpretation of the subsurface conditions, and Very Stiff 200 - 400
Hard greater than 400
their reliability will depend to some extent on
Friable strength not attainable – soil
frequency of sampling and the method of crumbles
drilling or excavation.
Rock types are classified by their geological
Interpretation of the information and its
names, together with descriptive terms
application to design and construction should
regarding weathering, strength, defects, etc.
therefore take into account the spacing of
boreholes or pits, the frequency of sampling, Planarity
and the possibility of other than ‘straight line’ CU Curved
variations between the test locations. DIS Discontinuous
IR Irregular
Description and Classification Methods PR Planar
ST Stepped
The description and classification of soils and UN Undulose
rocks used in this report are based on AS 1726.
Soil types are described according to the
predominating particle size and behaviour as
set out in the attached Unified Soil
Classification Table qualified by the percent of
October 2017 pg. 1
Section 59
Roughness Investigation Methods
POL Polished
RJ Rough Test Pits: These are typically undertaken with a
S Smooth backhoe or a tracked excavator, allowing
SL Slickened examination of the insitu soils. Limitations of test
VR Very Rough
pits are the problems associated with collapse
of the pits, disturbance and difficulty of
Defects Type reinstatement and the consequent effects on
BP Bedding Parting close-by structures. Care must be taken if
CL Cleavage construction is to be carried out near test pit
CO Contact locations to either properly recompact the
CS Crushed Seam backfill during construction or to design and
CZ Crushed Zone
construct the structure so as not to be
DB Drilling Break
adversely affected by poorly compacted
DK Dyke
DL Drill Lift backfill at the test pit location.
DZ Decomposed Zone
FC Fracture Hand Auger Drilling: A borehole of typical
FL Foliation diameter of between 50mm to 75mm advance
FZ Fracture Zone manually operated equipment. Premature
HB Handling Break refusal of the hand augers can occur on a
IS Infilled Seam variety of materials such as fill, gravel, hard
JT Joint clays and collapse of the borehole (typically in
H Schistosity non-cohesive soil).
SI Sill
SM Seam Continuous Spiral flight Augers: The borehole is
SS Shear Seam advanced using 65mm to 100mm diameter
SZ Shear Zone
continuous spiral flight augers, which are
VN Vein
withdrawn at intervals to allow sampling and
VO Void
insitu testing. Augers of up to 300mm in
Sampling diameter are used to recover larger volumes of
sample. Samples are returned to the surface
Sampling is undertaken during the fieldwork to by the flights or may be collected after
allow examination of the soil or rock and to withdrawal of the auger flights. Samples can
allow laboratory testing to be undertaken. be disturbed and layers may become mixed.
Augering below the groundwater table can be
Disturbed samples taken during drilling provide less reliable than augering above the water
information on plasticity, grain size, colour, table.
moisture content and minor constituents. Bulk
samples are similar but of greater volume A Tungsten Carbide (TC) bit for auger drilling
required for some test procedures such as CBR into rock can be used to indicate rock strength
testing. and continuity by variation in drilling resistance
and from examination of recovered rock
Undisturbed samples are taken by pushing a fragments but provides only an indication of
thin-walled sample tube, usually 50mm the likely rock strength. Where rock strengths
diameter (known as a U50), into the soil and may have a significant impact on construction
collecting a sample of the soil contained in a feasibility or costs, then further investigation by
relatively undisturbed state. Such samples yield means of cored boreholes may be warranted.
information on structure and strength, and are
necessary for laboratory determination of shear Wash Boring: The borehole is advanced by a
strength and compressibility. Undisturbed bit attached to the end of a hollow rod string,
sampling is generally effective only in cohesive with water being pumped down the drill rods
soils. and returned up the annulus of the borehole,
carrying the drill cuttings. Changes in
Details of the type and method of sampling stratification can be determined from the
used are given on the attached logs. return, together with information from “feel”
and rate of penetration.
Section 60
The borehole can be stabilised through the use using a Cone Penetrometer in general
of drilling mud as a circulating fluid. The term accordance with AS 1289 6.5.1, 1999.
‘mud’ encompasses a range of products
ranging from bentonite to polymers such as In the tests, a 36mm diameter rod with a
Revert or Biogel. conical tip is pushed continuously into the soil,
the reaction being provided by a hydraulic
Continuous Core Drilling: A continuous core ram system. Measurements are made of the
sample is obtained using a diamond tipped end bearing resistance on the cone and the
core barrel. This technique provides a reliable fractional resistance on a separate 135mm
(but relatively expensive) method of long sleeve, immediately behind the cone.
investigation. In rocks, an NMLC triple tube Pore Pressure is recovered through a pore ring
core barrel is used, which gives a core of about located either within, or more usually
50mm diameter. The length of core recovered immediately behind the cone/tip.
is compared to the length drilled and any
length not recovered is shown as CORE LOSS. As penetration occurs (at a rate of
approximately 20mm per second) and data is
Standard Penetration Tests: Standard recorded every 20mm of penetration, the
Penetration Tests (SPT) are used mainly in non- results are presented graphically.
cohesive soils, but can also be used in cohesive
soils as a means of indicating density or The information provided on the plot
strength and also of obtaining a disturbed comprises:
sample. The test procedure is described in
Cone resistance – expressed in mPa
Australian Standard 1289, “Methods of Testing
Sleeve friction – expressed in kPa
Soils for Engineering Purposed”, Test 6.3.1.
Friction ratio – the ratio of sleeve
The test is carried out in a borehole by driving a friction to cone resistance expressed as
50mm diameter split sample tube with a a percentage.
tapered shoe, under the impact of a 63kg Pore pressure in kPa
hammer, with a free fall of 760mm. The sample Tilt of probe (in degrees).
is driven in three successive 150mm increments
and the ‘N’ value is taken as the number of
The ratios of the sleeve resistance to cone
blows for the last 300mm. In dense soils, hard
resistance will vary with the type of soil
clays or weak rock, the full 450mm penetration
encountered, with higher relative friction in
may not be practicable and the test is
clays than in sands. Friction ratios of 1% to 2%
discontinued.
are commonly encountered in sands and rising
The test results are reported in the following to 2% to as high as 8%, and higher in organic
form: soils. Soil descriptions based on cone
resistance and friction ratios are only inferred
In the case where full penetration is and must not be considered as exact.
obtained with successive blow counts
for each 150mm of , say, 4, 6 and 7 Stratification can be inferred from the cone
blows, as and friction traces and from experience and
N = 13 information from nearby boreholes, etc. Where
4, 6, 7 shown, this information is presented for general
In a case where the test is discontinued guidance, but must be regarded as
short of full penetration, say after 15 interpretive.
blows for the first 150mm and 30 blows
Dynamic Cone Penetrometers:
for the next 40mm, as
N > 30
Dynamic Cone Penetrometer (DCP) tests are
15, 30/40mm
carried out by driving a 16mm diameter rod
into the ground with a 9kg sliding hammer
Cone Penetrometer Testing (CPT): Cone
dropping 510mm and counting the blows for
Penetrometer Testing with or without pore
successive 100mm increments of penetration.
pressure measurement (CPTu) is carried out
Section 61
Logs for fill, it may be difficult to reliably determine
the extent of the fill.
The borehole or test pit logs are an
interpretation of the subsurface conditions, and Laboratory Testing
their reliability will depend to some extent on
the frequency of sampling and the method of Laboratory testing is carried out in general
drilling or excavation. accordance with Australian Standard 1289
‘Methods of Testing Soil for Engineering
Interpretation of the information shown on the Purposes’.
logs, and its application to design and
construction, should therefore take into Site Anomalies
account the spacing of the boreholes or test
In the event that conditions encountered on
pits, the method of drilling or excavation, the
site during construction appear to vary from
frequency of sampling and testing and the
those which were expected from the
possibility of other than “straight line” variations
information contained in the report, the
between the boreholes or test pits. Subsurface
company requests that it immediately be
conditions between boreholes or test pits may
notified. Most problems are much more readily
vary significantly from conditions encountered
resolved when conditions are exposed than at
at the borehole or test pit locations.
some later stage.
Groundwater
Review of Design
Where groundwater levels are measured in
Where major civil or structural developments
boreholes, there are several potential
are proposed or where only a limited
problems:
investigation has been completed or where the
Although groundwater may be geotechnical conditions/constraints are quite
present, in low permeability soils it may complex, it is prudent to have a design review.
enter the hole slowly or perhaps not at
Site Inspection
all during the time it is left open.
A localised perched water table may
Pacific Geotech would be pleased to provide
lead to an erroneous indication of the
engineering inspection services for
true water table.
geotechnical aspects of work to which this
Water table levels will vary from time to
report is related:
time with seasons or recent weather
changes and may not be the same at Requirements could range from:
the time of construction.
The use of water or mud as a drilling i. a site visit to confirm that conditions
fluid will mask any groundwater inflow. exposed are no worse than those
Water has to be flushed from the hole interpreted, to
and drilling mud must be washed out ii. a visit to assist the contractor or other
of the hole or ‘reverted’ chemically if site personnel in identifying various
water observations are to be made. soil/rock types such as appropriate
More reliable measurements can be made by footing or pier founding depths, or
installing standpipes from which ongoing iii. full time engineering present on site.
monitoring can be undertaken.
Fill
The present of fill materials can often be
determined only by the inclusion of foreign
objects (e.g. bricks, steel ,etc.) or by distinctly
unusual colour, texture or fabric. Identification
of the extent of fill materials will also depend on
investigation methods and frequency. Where
natural soils similar to those at the site are used
Section 62
Project No. PG-5412
January, 2023
Ref: PG-5412, 2022-11-03, GR VER 3
International Coastal Management – Acid Sulfate Soil Investigation - Noosa River Dredging Program, Noosa River, Noosa
APPENDIX B
BOREHOLE RECORD SHEETS
Section 63
Borehole No.
BH08
Page 1 of 1
Project No.: PG-5412
Client: International Coastal Management Commenced: 30/10/2022
Project Name: Dredging Assessment Logged By: PE
Hole Location: Noosa River Checked By:
Hole Position: 506238.0 m E 7080296.0 m N MGA94 Zone 56
Drill Model and Mounting: Piston Sampler RL Surface: No survey
Hole Diameter: 75 mm Datum: AHD Operator:
Drilling Information Soil Description
Classification
Graphic Log
Samples Material Description
Recovery
Tests Fraction, Colour, Structure, Bedding,
Symbol
Method
Casing
Remarks Plasticity, Sensitivity, Additional
Water
RL Depth
(m) (m)
SP SAND (SP) Very loose, fine to medium grained, grey, some low to medium plasticity fines, wet.
0.20
0.2
SC Clayey SAND (SC) Very loose tine to medium grained, dark grey, medium to high plasticity fines, wet.
0.4
0.60
0.6
SP SAND (SP) Very loose, fine to medium grained, yellow brown, trace low to medium plasticity fines, wet.
PACGEO 1.01.1 LIB.GLB Log PACGEO BOREHOLE PG-5412.GPJ <<DrawingFile>> 13/01/2023 16:36 10.03.00.09 Datgel Lab and In Situ Tool - DGD | Lib: pacgeo 1.01.1 2018-05-15 Prj: Precise 1.01 2016-11-23
0.8
1.0
1.20
1.2
Hole Terminated at 1.20 m
1.4
1.6
1.8
Method Water Samples and Tests Remarks
AS - Auger Level (Date) U - Undisturbed Sample
RR - Rock Roller D - Disturbed Sample 1. Water depth = 1.2m.
WB- Washbore Inflow SPT - Standard Penetration Test 2. Drilled out of workboat.
B - Bulk Sample
Classification Symbols and
Support Soil Descriptions
C - Casing
Based on Unified Soil
Classification System
Section 64
Borehole No.
BH08.01
Page 1 of 1
Project No.: PG-5412
Client: International Coastal Management Commenced: 30/10/2022
Project Name: Dredging Assessment Logged By: PE
Hole Location: Noosa River Checked By:
Hole Position: 506253.0 m E 7080306.0 m N MGA94 Zone 56
Drill Model and Mounting: Piston Sampler RL Surface: No survey
Hole Diameter: 75 mm Datum: AHD Operator:
Drilling Information Soil Description
Classification
Graphic Log
Samples Material Description
Recovery
Tests Fraction, Colour, Structure, Bedding,
Symbol
Method
Casing
Remarks Plasticity, Sensitivity, Additional
Water
RL Depth
(m) (m)
SP SAND (SP) Very loose, fine to medium grained, grey, some low to medium plasticity fines, wet.
0.2
0.4
0.50
SP SAND (SP) Very loose, fine to medium grained, dark grey, some low to medium plasticity fines, wet.
0.6
PACGEO 1.01.1 LIB.GLB Log PACGEO BOREHOLE PG-5412.GPJ <<DrawingFile>> 13/01/2023 16:36 10.03.00.09 Datgel Lab and In Situ Tool - DGD | Lib: pacgeo 1.01.1 2018-05-15 Prj: Precise 1.01 2016-11-23
0.8
1.00
1.0
Hole Terminated at 1.00 m
1.2
1.4
1.6
1.8
Method Water Samples and Tests Remarks
AS - Auger Level (Date) U - Undisturbed Sample
RR - Rock Roller D - Disturbed Sample 1. Water depth = 1.3m.
WB- Washbore Inflow SPT - Standard Penetration Test 2. Drilled out of workboat.
B - Bulk Sample
Classification Symbols and
Support Soil Descriptions
C - Casing
Based on Unified Soil
Classification System
Section 65
Borehole No.
BH08.02
Page 1 of 1
Project No.: PG-5412
Client: International Coastal Management Commenced: 30/10/2022
Project Name: Dredging Assessment Logged By: PE
Hole Location: Noosa River Checked By:
Hole Position: 506188.0 m E 7080298.0 m N MGA94 Zone 56
Drill Model and Mounting: Piston Sampler RL Surface: No survey
Hole Diameter: 75 mm Datum: AHD Operator:
Drilling Information Soil Description
Classification
Graphic Log
Samples Material Description
Recovery
Tests Fraction, Colour, Structure, Bedding,
Symbol
Method
Casing
Remarks Plasticity, Sensitivity, Additional
Water
RL Depth
(m) (m)
SP SAND (SP) Very loose, fine to medium grained, grey, some low to medium plasticity fines, wet.
0.20
0.2
SC Clayey SAND (SC) Very loose tine to medium grained, dark grey, medium to high plasticity fines, wet.
0.4
0.60
0.6
SP SAND (SP) Very loose, fine to medium grained, yellow brown, trace low to medium plasticity fines, wet.
PACGEO 1.01.1 LIB.GLB Log PACGEO BOREHOLE PG-5412.GPJ <<DrawingFile>> 13/01/2023 16:36 10.03.00.09 Datgel Lab and In Situ Tool - DGD | Lib: pacgeo 1.01.1 2018-05-15 Prj: Precise 1.01 2016-11-23
0.8
1.0
1.20
1.2
Hole Terminated at 1.20 m
1.4
1.6
1.8
Method Water Samples and Tests Remarks
AS - Auger Level (Date) U - Undisturbed Sample
RR - Rock Roller D - Disturbed Sample 1. Water depth = 1.3m.
WB- Washbore Inflow SPT - Standard Penetration Test 2. Drilled out of workboat.
B - Bulk Sample
Classification Symbols and
Support Soil Descriptions
C - Casing
Based on Unified Soil
Classification System
Section 66
Borehole No.
BH08.03
Page 1 of 1
Project No.: PG-5412
Client: International Coastal Management Commenced: 30/10/2022
Project Name: Dredging Assessment Logged By: PE
Hole Location: Noosa River Checked By:
Hole Position: 506149.0 m E 7080284.0 m N MGA94 Zone 56
Drill Model and Mounting: Piston Sampler RL Surface: No survey
Hole Diameter: 75 mm Datum: AHD Operator:
Drilling Information Soil Description
Classification
Graphic Log
Samples Material Description
Recovery
Tests Fraction, Colour, Structure, Bedding,
Symbol
Method
Casing
Remarks Plasticity, Sensitivity, Additional
Water
RL Depth
(m) (m)
SP SAND (SP) Very loose, fine to medium grained, grey, some low to medium plasticity fines, wet.
0.2
0.25
SC Clayey SAND (SC) Very loose tine to medium grained, dark grey, medium to high plasticity fines, wet.
0.4
0.55
SP SAND (SP) Very loose, fine to medium grained, yellow brown, trace low to medium plasticity fines, wet.
0.6
PACGEO 1.01.1 LIB.GLB Log PACGEO BOREHOLE PG-5412.GPJ <<DrawingFile>> 13/01/2023 16:36 10.03.00.09 Datgel Lab and In Situ Tool - DGD | Lib: pacgeo 1.01.1 2018-05-15 Prj: Precise 1.01 2016-11-23
0.8
1.0
1.10
Hole Terminated at 1.10 m
1.2
1.4
1.6
1.8
Method Water Samples and Tests Remarks
AS - Auger Level (Date) U - Undisturbed Sample
RR - Rock Roller D - Disturbed Sample 1. Water depth = 1.7m.
WB- Washbore Inflow SPT - Standard Penetration Test 2. Drilled out of workboat.
B - Bulk Sample
Classification Symbols and
Support Soil Descriptions
C - Casing
Based on Unified Soil
Classification System
Section 67
Borehole No.
BH08.04
Page 1 of 1
Project No.: PG-5412
Client: International Coastal Management Commenced: 30/10/2022
Project Name: Dredging Assessment Logged By: PE
Hole Location: Noosa River Checked By:
Hole Position: 506214.0 m E 7080326.0 m N MGA94 Zone 56
Drill Model and Mounting: Piston Sampler RL Surface: No survey
Hole Diameter: 75 mm Datum: AHD Operator:
Drilling Information Soil Description
Classification
Graphic Log
Samples Material Description
Recovery
Tests Fraction, Colour, Structure, Bedding,
Symbol
Method
Casing
Remarks Plasticity, Sensitivity, Additional
Water
RL Depth
(m) (m)
SP SAND (SP) Very loose, fine to medium grained, grey, some low to medium plasticity fines, wet.
0.20
0.2
SC Clayey SAND (SC) Very loose tine to medium grained, dark grey, medium to high plasticity fines, wet.
0.4
0.6
PACGEO 1.01.1 LIB.GLB Log PACGEO BOREHOLE PG-5412.GPJ <<DrawingFile>> 13/01/2023 16:36 10.03.00.09 Datgel Lab and In Situ Tool - DGD | Lib: pacgeo 1.01.1 2018-05-15 Prj: Precise 1.01 2016-11-23
0.80
0.8
SP SAND (SP) Very loose, fine to medium grained, yellow brown, trace low to medium plasticity fines, wet.
1.0
1.2
1.4
1.60
1.6
Hole Terminated at 1.60 m
1.8
Method Water Samples and Tests Remarks
AS - Auger Level (Date) U - Undisturbed Sample
RR - Rock Roller D - Disturbed Sample 1. Water depth = 1.8m.
WB- Washbore Inflow SPT - Standard Penetration Test 2. Drilled out of workboat.
B - Bulk Sample
Classification Symbols and
Support Soil Descriptions
C - Casing
Based on Unified Soil
Classification System
The text continues on section 68.