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Attachment 3 - Stormwater Management Plan 1856-SBSMP-01 v5 (December 2019) · RAL18/0023
Plans and drawings: the text below has words only, no drawings.
SITE-BASED STORMWATER
MANAGEMENT PLAN
In Association with the
Reconfiguration of a Lot for the
Proposed Subdivision
at
Noosa Civic
28 Eenie Creek Road, Noosaville
Lot 3 on SP246584
for
Stockwell Pty Ltd
Ref: 1856-SBSMP-01_Version 5.0
December 2019
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DOCUMENT INFORMATION
Document Title: Site-Based Stormwater Management Plan
Document Reference No. 1856-SBSMP-01 – Version 5.0
Commissioned By: Stockwell Pty Ltd
Prepared By: Barlow Shelley Consulting Engineers Pty Ltd
Author: Vincent Vicic (BEng, GradIEAust)
Reviewed & Authorised By: Cameron Landreth (BEng (Hons), NER, RPEQ)
DOCUMENT CONTROL
Version Date Author Reviewer
1.0 8th March, 2019 Vincent Vicic Cameron Landreth
2.0 17th April, 2019 Vincent Vicic Cameron Landreth
3.0 15th May, 2019 Cameron Landreth Cameron Landreth
4.0 25th September, 2019 Cameron Landreth Cameron Landreth
5.0 2nd December, 2019 Cameron Landreth Cameron Landreth
“©2019 Barlow Shelley Consulting Engineers Pty Ltd All Rights Reserved. Copyright in the whole and every part of this
document belongs to Barlow Shelley Consulting Engineers Pty Ltd and may not be used, sold, transferred, copied or
reproduced in whole or in part in any manner or form or in or on any media to any person without the prior written consent
of Barlow Shelley Consulting Engineers Pty Ltd”
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EXECUTIVE SUMMARY Barlow Shelley Consulting Engineers Pty Ltd has been commissioned by Stockwell Pty Ltd to undertake a Site Based Stormwater Management Plan (SBSMP) for the proposed subdivision development at Lot 3 on SP246584 Eenie Creek Road, Noosaville, Queensland. An assessment of the stormwater quality requirements has been carried out in accordance with the Noosa Council Planning Scheme 2017. Stormwater quality improvement devices (SQIDs) are proposed to treat the road reserve, which is greater than 2,500 m2, therefore pollutant reduction targets must be met as per the Noosa Council Planning Scheme (2017) and Qld SPP (2017). A treatment train consisting of bioretention systems and a vegetated swale are proposed to mitigate pollutant load to meet the WSUD pollutant load reduction targets. The total bioretention filter area is 243m2 and the total swale length is 20m. The bioretention systems are situated in the road reserve or proposed drainage reserve and will be designed in accordance with the WSUD technical guidelines. When the individual lots created by this proposed subdivision are developed, they will require SQIDs to satisfy stormwater runoff pollutant removal targets. Updates to the MUSIC model parameters have been included in this version of the report. Modelling that includes the treatment of stormwater from pavement and a bushfire access track to the rear of Lots 11-15 is also included, as well as minor updates to catchments and stormwater management strategy resulting from ongoing design development. For ease of reference, any changes to the previous report are made in red text.
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CONTENTS 1.0 INTRODUCTION..................................................................................................... 1 2.0 SITE DESCRIPTION ............................................................................................... 2 3.0 PROPOSED DEVELOPMENT ................................................................................ 3 4.0 STORMWATER QUALITY MANAGEMENT ........................................................... 4 4.1 CONSTRUCTION PHASE .................................................................................. 5 4.2 OPERATIONAL PHASE ..................................................................................... 7 4.3 MUSIC Modelling ............................................................................................. 10 5.0 CONCLUSION ...................................................................................................... 19 6.0 LIMITATIONS OF THIS REPORT......................................................................... 20 7.0 REFERENCES...................................................................................................... 21 8.0 CLOSURE ............................................................................................................ 22
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APPENDICES APPENDIX A - Preliminary Plans by Barlow Shelley Consulting Engineers APPENDIX B - Stormwater Quality Objectives – Construction Phase
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1.0 INTRODUCTION
Barlow Shelley Consulting Engineers Pty Ltd was commissioned by Stockwell Pty Ltd to
prepare a Site Based Stormwater Management Plan (SBSMP). The plan relates to the
proposed subdivision development located on Lot 3 on SP246584 Eenie Creek Road,
Noosaville, Queensland (Refer to Figure 1.1 – Locality map of the site).
Lot 3 SP246584
Figure 1.1 Locality map of site
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2.0 SITE DESCRIPTION
The site is legally described as, Lot 3 on SP246584 Eenie Creek Road, Noosaville,
Queensland. It lies within the Local Government area of Noosa Council. Figure 2.1 below
shows the proximity of the site to Noosa Heads, and is approximately 5km to the South-
West of Noosa Heads.
Noosa Heads
Noosa Civic
Noosaville
Property boundary
Area = 31.7297 ha
Figure 2.1 Aerial image of site in Noosaville
The site has a total area of 31.7297ha and is developed as Noosa Civic, and vegetated with
existing bushland. The site is zoned as Open Space Conservation and Shire Business
Centre (SBC). The site is surrounded by similar zoned properties.
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3.0 PROPOSED DEVELOPMENT The proposed development consists of 25 lots. An internal road services the proposed lots. The proposed development will comprise the construction and/or installation of the following components for land use purposes: · site earthworks and buildings (future) · access driveway and car parks · stormwater drains · other ancillary services · landscaping. Once the development has been completed, all disturbed portions of the site will be rehabilitated or covered by some form of protection against soil erosion and the transportation of suspended solids from the site. These improvements will include structures, paved areas and landscaping. Site Based Stormwater Management Plan Page 3 of 22 1856-SBSMP-01_Version 5.0 (December 2019)
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4.0 STORMWATER QUALITY MANAGEMENT
This Site Based Stormwater Management Plan includes Stormwater Quality Management
guidelines for the construction phase of the development. The development will implement
stormwater quality management for construction and operational phases as per Qld SPP
(2017), Council’s PSP, and the Water Sensitive Urban Design (WSUD) Technical Manual
by Healthy Waterways. The efficiency of the Stormwater Quality Improvement Devices
(SQID’s) during operational phase have been assessed with a MUSIC model as outlined in
Section 4.3 of this report. Refer to the Stormwater Management Layout in Appendix A
showing the catchment boundaries and treatment nodes proposed for the development.
The proposed allotments remain vacant as part of the subdivision development. Given the
proposed use of the allotments, development of each lot would trigger a Material Change
of Use application. Each future development shall provide its own SQID's to satisfy
stormwater runoff pollutant removal targets for the specific lot. The SQID's modelled with
this report are to address stormwater runoff from the road reserves only.
This version of the Stormwater Quality Management Plan has been updated to include the
proposed bushfire access driveway and parking either side along the back of Lots 12-15.
These pavements will be introduced with the subdivision works so the stormwater
MUSIC model has been updated to include SQIDs to treat these impervious portions of the
lot only.
It is suggested, as discussed with Council representatives, that a property notation be
applied to these Lots (11-15) to clarify the function of this bioretention basin that would be
present at the rear of these lots. The property notation will also identify that lots with an area
less than 2,500m2 would also be required to provide stormwater quality treatment, whereas
the Qld SPP(2017) normally excludes a lot of this size from application of the design targets.
The proposed notation reads as follows:
A stormwater quality management plan will be required as part of any
submission to the Local Council. This management plan will address
treatment of stormwater runoff from the proposed development footprint in
accordance with the design pollutant removal targets in the Qld State
Planning Policy (2017) and the Noosa Plan.
<Additional wording for Lots 12-15>
The bioretention basin at the rear of this lot is designed to treat the existing
hardstand pavement area only, as provided with the greater subdivision
works.
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4.1 CONSTRUCTION PHASE
4.1.1 Pollutants
Typical pollutants generated during the construction phase of a development are listed in
Table 4.1 below.
Pollutant Potential Source Priority
Litter Paper, construction packaging, food packaging, High
cement bags, off cuts
Sediment Unprotected exposed soils and stockpiles during High
earthworks and building works
Hydrocarbons Fuel and oil spills, leaks from construction High
equipment and temporary car park areas.
Toxic Materials Cement slurry, asphalt primer, solvents, cleaning Medium
agents, wash waters (e.g. From tile works)
Alkaline Cement slurry and wash waters High
substances
Table 4.1 Typical Construction Phase Pollutants
4.1.2 Potential Impacts
Construction activities can have a potential impact on water quality. Removal of vegetation,
earthworks and changes to drainage patterns can result in erosion and sediment being
washed into waterways. This can impact on the physical-chemical parameters of the
receiving water, decline in the health of aquatic ecosystems, and overall aesthetics.
Potential impacts to the receiving waters surrounding the development site will be
minimized during the construction phase with typical measures as outlined below. These
measures should be adequately detailed on erosion and sediment control plans as part of
the development’s Operational Works application.
4.1.3 Performance Objectives
The amount of runoff traversing and discharging from the site while under construction
should be kept to a minimum. This will restrict soil erosion and mobilisation of sediments
and pollutants through and off the site.
Stormwater runoff at discharge points during the construction phase shall comply with the
objectives detailed in Table A in Appendix 2: Stormwater Management Design Objectives,
Part G, SPP (2017).
4.1.4 Control Measures
The following are typical treatment measures that should be implemented before the
commencement of any construction works. Detailed erosion and sediment control
procedures are to be based on the erosion and sediment control plans lodged at the
Operational Works phase.
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Maintenance Maintenance of erosion and control treatment measures (such as sediment fences) will be undertaken if it is observed that they have not been properly installed or the capacity of the measure falls below 75%. Minimise Disturbed Areas Only clear land which will be actively under construction in the near term (e.g. within the next 3-6 months). Stabilise Disturbed Areas Provide temporary stabilisation of disturbed soils whenever active construction is not occurring on a portion of the site. Provide permanent stabilisation during finish grade and landscape the site. Protect Slopes and Channels Safely convey runoff from the top of the slope and stabilise temporary and permanent channel crossings as quickly as possible and ensure that increases in runoff velocity caused by the project do not erode the channel. Diversions of Upslope Runoff To prevent the contamination of clean runoff, upslope runoff should be diverted away from areas of exposed soil. This may be achieved by installing tightly abutting sandbags, creating a ‘sandbag perimeter bank’ to divert flow. Sediment Fences and Inlet Protection Delineate site perimeter to prevent disturbing areas outside the project limits. Sediment fences should be installed around the perimeter of works to ensure contaminated runoff is filtered and sediment is trapped before leaving the site. Sandbags or geofabric should also be placed around/over existing stormwater inlets/grates throughout the site to ensure that any contaminated runoff is filtered before it enters the existing piped stormwater network. Retain Sediment Retain sediment-laden waters from disturbed, active areas within the site. Stabilised Vehicle Entry/Exit Point To minimise the transport of sediment off site, a stabilised entry/exit point should be constructed. All vehicles entering and leaving the site must use this designated entry/exit point. Site Based Stormwater Management Plan Page 6 of 22 1856-SBSMP-01_Version 5.0 (December 2019)
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Stockpiles Stockpile locations should be identified before the commencement of works. Ideally, they should be located in a flat area at least 15m from any water body or stormwater inlet. Sediment fences should be installed downslope of all erodible stockpiles, and upslope protection measures should be used (i.e. sandbags or sediment fence) to divert runoff in the event of rain. At the end of each working day stockpiles should be covered with geofabric if rain or high winds are forecast. Street Sweeping Ensure that local roads are swept as required. This will minimise the potential for sediment tracked onto the road to be washed into the stormwater system. If a large quantity of sediment is being tracked onto the surrounding streets the stabilised entry/exit point may need to be raked or reinforced with rock to provide more effective sediment removal for vehicles. Erosion Control Matting and Permanent Stabilisation Exposed areas onsite should be permanently stabilised (i.e. with turf) as the construction works progress. Erosion control matting or mulching should be used as a temporary measure to stabilize exposed areas before permanent stabilisation can be undertaken. Monitoring Monitoring and recording of the performance of the drainage control devices including are to be undertaken in accordance with local government requirements. It is further recommended that the proposed construction works are undertaken during periods of dry weather to reduce the potential for sediment to be transported off site during construction. 4.2 OPERATIONAL PHASE The internal drainage system has been designed to include SQIDs in the water quality treatment train for the proposed development. Refer to the conceptual drainage plans in Appendix A for details. 4.2.1 Bioretention Basin Bioretention basins are densely vegetated filtration devices, where runoff (for small/frequent storm events) enters the basin and is filtered through a filter media layer (e.g. sandy loam) as it percolates downwards. Bioretention basins often have an extended detention volume above the filter media which increases the volume of runoff treated through the system. The runoff is treated as it passes through the system through fine filtration, absorption, and Site Based Stormwater Management Plan Page 7 of 22 1856-SBSMP-01_Version 5.0 (December 2019)
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some biological uptake. Refer to Figure 4.1 below showing a typical cross section of a
bioretention basin.
Figure 4.1 Typical cross section of a bioretention basin
Bioretention provides a number of functions including:
· Reduce the velocity of runoff;
· Trap sediment and associated pollutants; and
· Reduce concentrations of nutrients such as Nitrogen and Phosphorous.
The detailed design, construction and maintenance of bioretention basins should be in
accordance with the ‘WSUD Technical Design Guidelines’. Plant species for bioretention
basins within this development should be selected based on WSUD Technical Design
Guidelines, and the integration with the landscape design.
Establishing Bioretention Basins
The establishment period for plant species before the vegetation is mature and fully
functional is typically two years. During this period, regular site maintenance and monitoring
is crucial to the success of the basin as a treatment device
4.2.2 Bioretention Street Tree (Tree Pit)
Bioretention Street Trees are a combination of a bioretention system and a street tree. They
are typically designed to be small systems able to accommodate trees suitable for use in
streetscapes and shrubs for additional nutrient uptake and aesthetics.
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Figure 4.2 Typical cross section of a bioretention street tree (Source IPWEA standard drawing DS-077) Site Based Stormwater Management Plan Page 9 of 22 1856-SBSMP-01_Version 5.0 (December 2019)
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4.3 MUSIC Modelling
MUSIC (Version 6.2, eWater), a pollutant export modelling program has been used to model
both the expected pollutant loads generated by the development and the effectiveness of
WSUD treatment options selected.
4.3.1 Split Catchment Approach
The MUSIC model is based on a split catchment approach, modeled as various catchments
representing the different surface types in accordance with the guidelines and available site
information. Split catchment surface information can be found in Table 4.2 below. The
fraction impervious was calculated from proposed sealed pavement areas, and rounded up
to the nearest 5% to account for minor adjustments in detailed design.
Surface Type % Imperviousness
Road Reserve Varies (75% / 70% / 60%)
Table 4.2 Adopted % Imperviousness
Table 4.3 lists the total areas for the surface type in the catchment that was used in the
model. The total area is the proposed total extent of the road reserve area. Refer to the
Catchment Plan in Appendix A demonstrating these areas within the proposed development.
Node Area (ha)
West Hofmann Drive (South-1) 0.1350
West Hofmann Drive (North) 0.2247
West Hofmann Drive (South-2) 0.1091
Road A 0.2424
Road B 0.4000
Upper Road C 0.2368
Lower Road C 0.3569
North Road & Part Roundabout 0.2419
Sub - Total 2.5358
Lot 11-15 Car Parks and Driveways 0.5155
Total 3.0513
Table 4.3 Surface Area of Nodes
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4.3.2 MUSIC Meteorological Data
Cooroy DPI (Station 40059) meteorological data was selected for the MUSIC analysis. The
10-year climate period was selected in accordance with Table 3.1 of the guidelines. The
rainfall and evapo-transpiration data for the period of 01/01/1973 to 31/12/1983, with a 6-
minute time step was used in the model.
Input parameters for the rainfall-runoff, source nodes and treatment devices were also
obtained from the guidelines. The following parameters were selected based on a
commercial/industrial development.
4.3.3 Rainfall-Runoff Parameters
The rainfall-runoff parameters listed in Table 3.7 of MUSIC guidelines were used in the
model. The parameters recommended by the guideline are as shown in Table 4.4 below.
PARAMETER Commercial/Industrial
Rainfall threshold (mm) 1
Soil storage capacity (mm) 18
Initial storage (% capacity) 10
Field capacity (mm) 80
Infiltration capacity 243
Coefficient a
Infiltration capacity 0.6
Exponent b
Initial depth (mm) 50
Daily recharge rate (%) 0
Daily baseflow rate (%) 31
Daily deep seepage rate (%) 0
Table 4.4 Recommended rainfall-runoff parameters
4.3.4 MUSIC Pollutant Export Parameters Split Catchment Land Use (Commercial)
TSS log10
TP log10 values TN log10 values
Surface values
Flow Type
Type St. St. St.
Mean Mean Mean
dev. dev. dev.
Baseflow Roof N/A N/A N/A N/A N/A N/A
parameters
Roads 0.78 0.39 -0.6 0.50 0.32 0.30
Ground 0.78 0.45 -1.11 0.48 0.14 0.20
Level
Stormflow Roof 1.30 0.44 -0.89 0.36 0.25 0.32
Parameters
Roads 2.43 0.38 -0.30 0.34 0.37 0.34
Ground 1.92 0.44 -0.59 0.36 0.25 0.32
Level
Table 4.5 MUSIC Export Parameters Split Catchment Land Use (Industrial)
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4.3.5 MUSIC Treatment Node Parameters (Post Developed Site)
Bioretention Basins
Figure 4.33 to Figure 4.5 show the parameters for the bioretention basins.
Figure 4.3 Bioretention node parameters for the new North Roundabout
Figure 4.4 Bioretention node parameters for Upper Road C catchment (Combined Node)
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Figure 4.5 Bioretention node parameters for Lower Road C Catchment
Figure 4.6 Bioretention node parameters for Road B Street Trees (combined node)
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Figure 4.7 Bioretention node parameters for Road A
Figure 4.8 Bioretention node parameters for Hofmann Drive (north side)
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Figure 4.9 Bioretention node parameters for Hofmann Drive (south side in front of Lot 16)
Figure 4.10 Bioretention node parameters for Hofmann Drive (south side in front of Lot 15)
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Figure 4.11 Bioretention node parameters for basins in Lots 12-15 for car parking and driveway pavements
Vegetated Swale
Figure 4. shows the parameters for the vegetated swale node in the MUSIC model.
Figure 4.12 Vegetated Swale Node Parameters
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Buffer
Figure4.13 shows the parameters for the buffer node in the MUSIC model. This is applied
where runoff from the bushfire access driveway pavement will runoff via sheet flow to the
surrounding ground
Figure 4.12 Bufffer Node Parameters
4.3.6 MUSIC Model Results
Figure 4.14 shows the MUSIC model treatment train layout and results from the proposed
stormwater quality improvement devices (SQIDs), which is also shown on drawings
1856/SW01-SW05 in Appendix A. The results as shown below were generated using the
stochastic option as per the guidelines.
Figure 4.14 MUSIC Model Results
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All load-based pollutant reduction efficiencies are met in accordance with the Table A in Appendix 2: Stormwater Management Design Objectives, Part G, SPP (2017) included in Appendix B. The bioretention treatment nodes for the car parking pavements in Lots 12-15 are modelled as all the same size for consistency at planning stage. It is recommended that the MUSIC file be updated as part of the Operational Works design to correctly capture batters and extended detention, final pavement catchments etc. with the construction drawings for these works. The Noosa Plan, Division 20-Water Sensitive Design Code, table 14-61 Specific Outcome S1.5 requires that stormwater discharging to naturally acidic areas are managed to prevent eutrophication. Council representatives have identified that areas to the south of Lot 11 and 12, including the covenant land incorporated within Lot 12, are naturally acidic areas. To manage this, it is recommended that stormwater outlets from post treatment systems and runoff from both Lots 11 and 12 should occur to the surface at a lower level to the lot pad so that discharged water has sufficient room to disperse across the ground, absorbing nitrogen and reducing the runoff pH from contact with decomposing leaf litter. To achieve this, a rock pad generally in accordance with the design specification in QUDM-2017 is proposed at these outlet to the treatment system and pipe discharge for Lot 12, with the exception that the rock pad flares at 1:1 instead of 1:5 to encourage flow dispersion. The piped discharge for Lot 11 is to the drainage system in Road B. Any runoff from the rear of the lot is to be buffered by groundcover vegetation areas either side of the bushfire access track. This maintains the flow regime as sheet runoff and allows the surface water to be in contact with the soils and natural vegetation of the area as it moves south, to correctly balance the pH before entering the acidic areas. Site Based Stormwater Management Plan Page 18 of 22 1856-SBSMP-01_Version 5.0 (December 2019)
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5.0 CONCLUSION
This site-based stormwater management plan has reviewed the stormwater quality
management at the proposed development at Noosaville, Queensland.
Based on this assessment the following conclusions have been made:
· The proposed development includes Stormwater Quality Improvement Devices being
bioretention basins and vegetated swales treating post-developed flows from the
proposed road reserve only, in accordance with the Qld SPP (2017). The total amount
of treatment devices are as follows:
o Vegetated swale (total length) = 20m
o Buffered area = 50m2
o Bioretention basin (total area) = 243m2
In the event the individual lots created by this subdivision are developed, they will require
SQIDs to satisfy stormwater runoff pollutant removal targets for each specific lot.
In summary, stormwater leaving the site will satisfy the pollutant removal criteria in Council’s
Planning Scheme and the Qld SPP.
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6.0 LIMITATIONS OF THIS REPORT This Site Based Stormwater Management Plan (SBSMP) has been tailored to report on issues in the areas of interest, as detailed above. The information in this report is not to be used outside of the subject area. We consider that this SBSMP accurately considers conditions at the area of interest at the time the SBSMP was developed and based on information supplied to us by second and third parties. This SBSMP is to be reviewed, if site conditions change in the future. This SBSMP has been undertaken for the specific purposes of the Stockwell Pty Ltd, as detailed in our correspondence to them, and is solely for their use. This SBSMP should only be used in full and may not be used to support objectives other than those set out herein, except where written approval, with comments, are provided by Barlow Shelley Consulting Engineers. Barlow Shelley Consulting Engineers accept no liability with respect to the accuracy of information supplied by second and third parties. Site Based Stormwater Management Plan Page 20 of 22 1856-SBSMP-01_Version 5.0 (December 2019)
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7.0 REFERENCES Department of Infrastructure, Local Government and Planning (July 2017), State Planning Policy, DILGP, Brisbane. Institute of Public Works Engineering Australasia, Queensland (2017), Queensland Urban Drainage Manual – Fourth Edition, IPWEAQ, Queensland. Water by Design (2014). Bioretention Technical Design Guidelines (Version 1.1). Healthy Waterways Ltd, Brisbane. Site Based Stormwater Management Plan Page 21 of 22 1856-SBSMP-01_Version 5.0 (December 2019)
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8.0 CLOSURE Should further information be required please contact: AUTHORED BY: _______________________________ VINCENT VICIC – ENGINEER BEng GradIEAust For and on behalf of: BARLOW SHELLEY CONSULTING ENGINEERS (AUST) PTY LTD REVIEWED & APPROVED BY: _________________________________________ CAMERON LANDRETH – DIRECTOR (RPEQ 19358) BEng (Hons), NER, RPEQ For and on behalf of: BARLOW SHELLEY CONSULTING ENGINEERS (AUST) PTY LTD Site Based Stormwater Management Plan Page 22 of 22 1856-SBSMP-01_Version 5.0 (December 2019)
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A
Appendix
Preliminary Plans by Barlow Shelley Consulting Engineers
- Drawings 1856/SW01-SW07
Prepared by Barlow Shelley Consulting Engineers
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RIVE
ANN D
HOFM
LOT 9
DB
E
IV
R
ROA
D
Y
RO A
H
AD ER
A LT
A
W
LOT 16
SWALE 20m
BIO-RETENTION
B
AD LOT 10
RO
LOT 13
LOT 11
LOT 12
E
IV
R
D
Y
A
H
ER
BIO-RETENTION LT
A
W
OUTLET SCOUR
PROTECTION TO
QUDM SPECS.
LEGEND - EXISTING SERVICES
EXISTING SEWER DN225 uPVC SN8
EXISTING SEWER DN150 uPVC SN8
DRIVEWAY FOR TABLE DRAIN
EXISTING DN150 OPVC PN16 WATERMAIN
COVENANT EXISTING DN250 DI PN35 WATERMAIN
EXISTING DN610 WATERMAIN
LEGEND - NEW WORKS EXTENT
STORMWATER DRAINAGE
EXTENT OF AC SEAL
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY
IVE
DR
ROAD CENTRELINE
Y
HA
PROJECT: JOB NUMBER
ER
REV DATE DESCRIPTION BY CHKD SCALE APPROVED
1856
T
AL
J 02-12-19 REVISED FOR COMMENT MM CL
AHD
W
DATUM SHEET: OF
B
C
16-07-19
13-08-19
REVISED FOR INFORMATION REQUEST
REVISED DRIVEWAYS & PATHWAYS
MM
JP
CL
CL DESIGN MM
0 10 20 30 40 50m ................. 1 7
D 28-08-19 REVISED ADDED LINK ROAD MM CL Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
E 25-09-19 UPDATE SW CL CL (RPEQ 19358)
SCALE 1:1000 A3
F 1/11/19 REVISED FOR COUNCIL RFI MM CL DESIGN CHECK CL
DRAWING STATUS
07 5443 8285
SW01 J
G 1/11/19 REVISED FOR COUNCIL RFI MM CL [email protected] www.barlowshelley.com.au
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL
H 21-11-2019 DRAFT FOR COMMENT ONLY MM CL Barlow Shelley Consulting Engineers PO Box 899, Maroochydore,4558 ABN 89 215 591 077
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BIO-RETENTION CATCHMENT 3659m2
LOT 4
KERB ADAPTOR INLETS
TO BIO-RETENTION
BASIN - TYPICAL
LOT 6
LOT 5
H
O
FM
A
N
BIO-RETENTION
N
D
2 LOT 8
R
CATCHMENT 1102m
CATCHMENT 2247m2
IV
E
LOT 15
BIO-RETENTION
RIVE
ANN D
BIO-RETENTION HOFM
CATCHMENT 4060m2 LOT 9
B
D CATCHMENT 2680m2
ROA
OUTLET SCOUR
PROTECTION TO RO
QUDM SPECS. AD
2 A DISCHARGE INTO EXISTING
CATCHMENT 1332m STORMWATER NETWORK
LOT 16
SWALE 20m
LOT 14
BIO-RETENTION
B
AD LOT 10
RO
BIO-RETENTION
CATCHMENT 3652m2 LEGEND - NEW WORKS EXTENT
OUTLET SCOUR LOT 13
LOT 11
PROTECTION TO STORMWATER DRAINAGE
QUDM SPECS.
EXTENT OF AC SEAL
BIO-RETENTION
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
LOT 12
EXTENT OF 2m WIDE CONCRETE FOOTPATH
E EXTENT OF COMMERICAL DRIVEWAY
IV
R
D
AY
H
ER
A LT
ROAD CENTRELINE
W
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD SCALE APPROVED
1856
J 02-12-19 REVISED FOR COMMENT MM CL
DATUM AHD SHEET: OF
B
C
16-07-19
13-08-19
REVISED FOR INFORMATION REQUEST
REVISED DRIVEWAYS & PATHWAYS
MM
JP
CL
CL DESIGN MM
0 10 20 30 40 50m ................. 2 7
D 28-08-19 REVISED ADDED LINK ROAD MM CL Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
E 25-09-19 UPDATE SW CL CL (RPEQ 19358)
SCALE 1:1000 A3
F 1/11/19 REVISED FOR COUNCIL RFI MM CL DESIGN CHECK CL
DRAWING STATUS
07 5443 8285
SW02 J
G 1/11/19 REVISED FOR COUNCIL RFI MM CL [email protected] www.barlowshelley.com.au
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL
H 21-11-2019 DRAFT FOR COMMENT ONLY MM CL Barlow Shelley Consulting Engineers PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Page 31
LOT 21
HO
FM
AN
N
DR
IV
E
LOT 19
REFER TO TYPICAL TURFED
SWALE DETAIL ON SW07
LOT 18
LOT 17
H
O
FM
A
N
N
D
R
LEGEND - NEW WORKS EXTENT IV
E
STORMWATER DRAINAGE
EXTENT OF AC SEAL
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
BIO-RETENTION
EXTENT OF COMMERICAL DRIVEWAY
LOT 4
ROAD CENTRELINE
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD SCALE APPROVED
1856
J 02-12-19 REVISED FOR COMMENT MM CL
DATUM AHD SHEET: OF
B
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16-07-19
13-08-19
REVISED FOR INFORMATION REQUEST
REVISED DRIVEWAYS & PATHWAYS
MM
JP
CL
CL DESIGN MM
0 10 20 30 40 50m ................. 3 7
D 28-08-19 REVISED ADDED LINK ROAD MM CL Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
E 25-09-19 UPDATE SW CL CL (RPEQ 19358)
SCALE 1:1000 A3
F 1/11/19 REVISED FOR COUNCIL RFI MM CL DESIGN CHECK CL
DRAWING STATUS
07 5443 8285
SW03 J
G 1/11/19 REVISED FOR COUNCIL RFI MM CL [email protected] www.barlowshelley.com.au
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL
H 21-11-2019 DRAFT FOR COMMENT ONLY MM CL Barlow Shelley Consulting Engineers PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Page 32
OUTLET
OUTLET
D
R OA
ED
-N AM
UN
CATCHMENT 2419m2
BIORETENTION
E
Y DRIV
ER HA
WALT
NEW STORMWATER
CATCH PIT
NEW STORMWATER
CATCH PIT
LOT 3
CATCHMENT 2368m2
4.004 Ha
LEGEND - NEW WORKS EXTENT
STORMWATER DRAINAGE
EXTENT OF AC SEAL
KERB & CHANNEL (B1 TYPE 450mm CHANNEL) LOT 7
2.963 Ha
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY
CATCHMENT 3659m2
E
Y DRIV
ROAD CENTRELINE
ER HA
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD SCALE APPROVED
1856
WALT
J 02-12-19 REVISED FOR COMMENT MM CL
DATUM AHD SHEET: OF
B
C
16-07-19
13-08-19
REVISED FOR INFORMATION REQUEST
REVISED DRIVEWAYS & PATHWAYS
MM
JP
CL
CL DESIGN MM
0 10 20 30 40 50m ................. 4 7
D 28-08-19 REVISED ADDED LINK ROAD MM CL Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
E 25-09-19 UPDATE SW CL CL (RPEQ 19358)
SCALE 1:1000 A3
DESIGN CHECK CL
DRAWING STATUS
07 5443 8285
SW04 J
G 1/11/19 REVISED FOR COUNCIL RFI MM CL [email protected] www.barlowshelley.com.au
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL
Barlow Shelley Consulting Engineers PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Page 33
LOT 23
2.61 Ha
W
AL
TE
R
HA
Y
DR
IV
E
OUTLET OUTLET
LOT 2
LEGEND - NEW WORKS EXTENT
U
N
-N
AM
STORMWATER DRAINAGE
ED
R
EXTENT OF AC SEAL
O
AD
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY
ROAD CENTRELINE
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD SCALE APPROVED
1856
J 02-12-19 REVISED FOR COMMENT MM CL
DATUM AHD SHEET: OF
B
C
16-07-19
13-08-19
REVISED FOR INFORMATION REQUEST
REVISED DRIVEWAYS & PATHWAYS
MM
JP
CL
CL DESIGN MM
0 10 20 30 40 50m ................. 5 7
D 28-08-19 REVISED ADDED LINK ROAD MM CL Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
E 25-09-19 UPDATE SW CL CL (RPEQ 19358)
SCALE 1:1000 A3
F 1/11/19 REVISED FOR COUNCIL RFI MM CL DESIGN CHECK CL
DRAWING STATUS
07 5443 8285
SW05 J
G 1/11/19 REVISED FOR COUNCIL RFI MM CL [email protected] www.barlowshelley.com.au
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL
Barlow Shelley Consulting Engineers PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Page 34
EE
NI
E
CR
EE
K
RO
AD
EE
LOT 22 NI
E
CR
EE
K
RO
A D
DRIVE
NN
F MA
HO
NN
FMA
HO
UN
-N
AM
ED
RO
AD
LEGEND - NEW WORKS EXTENT
STORMWATER DRAINAGE
EXTENT OF AC SEAL
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY
ROAD CENTRELINE
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD SCALE APPROVED
1856
J 02-12-19 REVISED FOR COMMENT MM CL
DATUM AHD SHEET: OF
B
C
16-07-19
13-08-19
REVISED FOR INFORMATION REQUEST
REVISED DRIVEWAYS & PATHWAYS
MM
JP
CL
CL DESIGN MM
0 5.0 10 15 20 25m ................. 6 7
D 28-08-19 REVISED ADDED LINK ROAD MM CL Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
E 25-09-19 UPDATE SW CL CL (RPEQ 19358)
SCALE 1:500 A3
F 1/11/19 REVISED FOR COUNCIL RFI MM CL DESIGN CHECK CL
DRAWING STATUS
07 5443 8285
SW06 J
G 1/11/19 REVISED FOR COUNCIL RFI MM CL [email protected] www.barlowshelley.com.au
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL
Barlow Shelley Consulting Engineers PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Page 35
BDY
4.00m
1.00m 2.00m 2.00m
<2.5%
1:2 1:2
TYPICAL TURFED SWALE DETAIL
NOT TO SCALE
1.5m 2.0m 1.0m
TEMPORARY TURF
RL = + 500MM FROM
FILTER MATERIAL
50mm TOP SOIL
0.15
1:3 MIN
1:2
GOETEXTILE FABRIC
WRAPPED OVER COMPLETE
FILTER MEDIA
TEMPORARY TURF OVER 50mm SOIL BIORETENTION BASIN
AND GOETEXTILE LAYER' REFER TO FUTURE MACROPHYTE PLANTING REFER TO TYPICAL
DETAIL A TO SUIT GROUND CONDITIONS CROSS SECTION.
WITH MULCH LAYER (REFER
LANDSCAPING DRAWINGS)
DRAINAGE PIPES
BIORETENTION DETAIL
POLY LINER NOT TO SCALE
BIO-RETENTION - TYPICAL SECTION
NOT TO SCALE
FILTER CLOTH OR ORGANIC GEOTEXTILE MATTING FIXED TO
PERIMETER OF WALLS TO AVOID RUNNELLING OF WATER
BETWEEN PIT AND SOIL INTERFACE. 300 WIDE, 100 COVER. FIELD INLET PIT TYPE 1
WITHOUT CONCRETE
C.I. CAP TO EXTEND FUTURE PLANTING TO APRON (IPWEA STD DWG
PROPOSED EDGE APPROX. 150mm ABOVE LANDSCAPE PLANS D-0050
RESTRAINT (ER2 TYPE) BASIN SURFACE OVERFLOW PIT 300mm
ABOVE BIORETENTION FSL
MEDIA LEVEL TEMPORARY TURF
1:2 AND TOP SOIL 1:2
3%> <3%
BIORETENTION 600
100
1:4 FILTER MEDIA
1:4
COARSE SAND 100
5-10mm GRAVEL 200
PVC DRAINS CONNECT PVC OUT
INTO GRATED PIT.
SWALE - TYPICAL SECTION GRADE AT 0.5%
NOT TO SCALE CONCRETE VEE 300mm TYPICAL BIORETENTION SCHEMATIC AND DETAILS
WIDE
NOT TO SCALE
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD SCALE APPROVED
1856
J 02-12-19 REVISED FOR COMMENT MM CL
DATUM AHD SHEET: OF
B
C
16-07-19
13-08-19
REVISED FOR INFORMATION REQUEST
REVISED DRIVEWAYS & PATHWAYS
MM
JP
CL
CL DESIGN MM
0 5.0 10 15 20 25m ................. 7 7
D 28-08-19 REVISED ADDED LINK ROAD MM CL Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
E 25-09-19 UPDATE SW CL CL (RPEQ 19358)
SCALE 1:500 A3
F 1/11/19 REVISED FOR COUNCIL RFI MM CL DESIGN CHECK CL
DRAWING STATUS
07 5443 8285
SW07 J
G 1/11/19 REVISED FOR COUNCIL RFI MM CL [email protected] www.barlowshelley.com.au
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL
Barlow Shelley Consulting Engineers PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Page 36
Appendix
Stormwater Quality Objectives – Construction Phase
- SPP (2017), Part G, Appendix 2, Table A. Department of Infrastructure, Local
Government & Planning (DILGP).
- Healthy Waterways Guidelines for Building Sites
Page 37
Table B: Post construction phase - stormwater management design objectives Application: (1) A material change of use for an urban purpose that involves premises 2500 metres? or greater in size and: (a) will result in six or more dwellings; or (b) an impervious area greater than 25 per cent of the net developable area. (2) Reconfiguring a lot for urban purposes that involves premises 2500 metres? or greater in size and will result in six or more lots. Climatic region YTS) (ae Nod Reductions in mean annual load from unmitigated development (%) Total Total Total (TCs) Waterway stability Ere. Pe Cred nee) pollutants management solids (TSS) (TP) (TN) Peru South East Queensland 80 60 45 90 Limit the peak 1-year ARI event discharge within the receiving Central Queensland (north) 75 60 40% 90 waterway to the pre-development peak Central Queensland (south) 85 60 45 90 14, i 16, Cape York , Wet tropics and 80 60 40 90 1-year ARI discharge dry tropics Western Queensland** 85 60 45 90 Notes: © Mapping of climatic regions is available on the State Planning Policy Interactive Mapping System. ¢ In lieu of modelling, the default bio-retention treatment area to comply with load reduction targets for all Queensland regions in 1.5 per cent of the contributing catchment area. ¢ Water stability objective applies if development drains to an unlined waterway within or downstream of the site where a risk of increased erosion exists due to changes in hydrology. Local government may also require application of the waterway stability objective where there are planned future rehabilitation works to return a lined channel to a natural channel design. © The SPP Water quality guidance material provides advice on the measures that demonstrate compliance with table B. Note: Applies to population centres greater than 25,000 persons. Note: Mackay Regional Council has adopted a 35 per cent reduction for TN. Note: Townsville City Council has adopted a 65 per cent reduction for TP. page 82
Page 38
Part 2: Construction phase — stormwater management design objectives for temporary drainage works Temporary drainage works PM ee CC Cem LC! PEL Cer Mrs PPro meld ey murs > Drainage structure 1in 2 year 1in5 year 1in 10 year 3 ARI/39% AEP ARI/18% AEP ARI/10% AEP 2 Where located immediately up-slope of an occupied 1in10 year ARI/10% AEP & property that would be adversely affected by the failure or overtopping of the structure Culvert crossing 1in 1 year ARI/63% AEP Part 3: Construction phase — stormwater management design objectives for emergency spillways on temporary sediment basins Drainage structure PM el CC Cem LC! PU ne Re Puc is cer PMC PPP MUO ry Emergency spillways on temporary sediment basins 1in 10 year 1in 20 year 1in 50 year ARI/10% AEP ARI/5% AEP ARI/2% AEP Note: Refer to IECA 2008 Best Practice Erosion and Sediment Control (as amended) for details on the application of the Construction Phase requirements. Advice should be obtained from a suitably qualified person e.g. Certified Practitioner in Erosion and Sediment Control, or Registered Professional Engineer Queensland, with appropriate knowledge and experience in erosion and sediment control design and implementation. State Planning Policy page 81
Page 39
Controlling stormwater pollution on your building site MHEALTHY WATERWAYS = uae tla sae
Page 40
ML aL DTCs Introduction Boece These guidelines provide a practical guide to best practice techniques to minimise stormwater pollution from building sites. They are designed to help people involved in the building industry comply with their statutory environmental duties and avoid large fines. Erosion and sediment control on Uc erecta} eE-1im L611 ae | <= TtaNViT ce) ay any =181 21) Ser The following fact sheets provide practical examples of recommended control measures. Included is an easy- to-follow daily site checklist to guide site supervisors. 110 (0) go) A 1 C) [- Af To lta] CC01 10) @ Erosion and sediment control daily site check list IY e-Tl alee [I Xe) (Ce) : : : : @ Erosion and sediment control on residential Building operations.........................0.. building sites @ Erosion control @ Sediment control ® Drainage control Storage of materials on hard surfaces.............. CCTCoTe) oX-Yo N o1¥ Cel] ate (0) <n Erosion and Sediment Control Management Plans .. . 3) Building operations @ Storage of materials on hard surfaces Grouped building lots @ Erosion and Sediment Control Management Plans Erosion and sediment control BEST PRACTICE daily site check list Best practice is the management of an activity to ensure environmental harm is minimised using cost-effective An erosion and sediment contro! check list has been measures. These practices are assessed against national developed to assist builders and site supervisors and international standards. managing the task of control measure maintenance. SAVE MONEY TIME AND ENERGY Some of the benefits to home owners, builders and the building industry include: For further information on erosion and sediment control, contact your local council. all-weather site access improved wet weather working conditions LEGEND sites do not get boggy less mud and dust problems ~ Best practice reduced stockpile losses reduced clean-up costs ~ Not best a better public image Practice more marketable sites fewer public complaints ¢ reduced risk of fines ¢ better fishing for everyone e healthier waterways. National and international experience shows that the cost of effective pollution management on building sites is greatly reduced within the first few years as builders become experienced with the various techniques.
Page 41
What are the impacts? Soil, sediment and litter from building sites can be major sources of stormwater pollution, and can cause: * negative impacts on recreational fishing and the seafood industry * sediment build-up within waterways which can lead to weed growth ¢ loss of valuable topsoil * significant public safety problems when washed onto roads and intersections Mud and dirt on road after rain due to poor on-site erosion and sediment control e — blocked drains and water sensitive urban design features leading to flooding and increased maintenance costs to the community * — significant harm to the environment of freshwater and marine systems through the loss of valuable seagrass habitat for marine creatures * — public health issues from increased algal blooms * reduced recreational opportunities due to increased turbidity Sediment moving out of Moreton Bay into the ocean through Jumpinpin Erosion and sediment control on residential building sites Principles of effective stormwater pollution control include: ¢ — sensible site planning * — diversion of up-slope water (where appropriate) * — stabilised site entry/exit point ¢ — minimisation of site disturbance and duration of disturbance ¢ installation of sediment controls along the lower edge of the site * appropriate location and protection of stockpiles * — early connection of roofwater downpipes * trap on-site run-off from tool, paint and concrete washing and brick, tile and concrete cutting * continual monitoring and maintenance of all control measures * compaction of backfilled trenches * revegetation and stabilisation of the site * — development and implementation of Erosion and Sediment Control Management Plans when appropriate. Control measures in place on a residential building site
Page 42
MLL LL SITE PLANNING When planning the site layout, building location and earthworks, it is possible to minimise the number of control devices needed for the sediment control zone, and their interference with the building process, with a little forward thinking. Suggestions are to: * — minimise the reshaping of the land ¢ — direct stormwater to flow around the building area and any unstable batters ¢ — allow room for a sediment barrier, eg. sediment fence, to be located along the lower side of the disturbance * — design the home to suit the property type, eg. construct pole homes on steep properties * avoid the permanent use of long, steep and unstable driveways * avoid the use of exposed aggregate concrete surfaces in areas where the wash-off cannot be contained. ST Ye taco Alt) The sediment control zone is any area of land disturbance which has potential for the erosion of sediments. This area should be protected by a downslope sediment control fant Te lc Mel are (A [ao Good site planning Poor site planning — stockpile over sediment fence, materials and toilet stored outside building site Environmental law The Environmental Protection Act 1994, Environmental Protection (Water) Policy 1997 and the Integrated Planning Act 1997 are important pieces of legislation that control the way in which soil erosion and sediment are required to be dealt with on building and development sites. PENALTIES Breaches of the Environmental Protection (Water) Policy 1997 may result in: * — on-the-spot fines under the Environmental Protection (Water) Policy 1997 (ranging from $300 to $600) * prosecutions under the Integrated Planning Act 1997 or the Environmental Protection Act 1994 (fines of thousands of dollars or prison sentences for serious offences) * the prosecution of individuals and/or companies. Council officer explaining the Environmental Protection (Water) Policy 1997
Page 43
Erosion controls MINIMISE DISTURBANCE ¢ — Earthworks should be kept to a minimum, and should only be commenced immediately prior to building works. ¢ — Maintain as much soil coverage as possible with the use of grass, leaf litter and mulch, gravel or erosion control blanket (ECB) or matting. * — Vegetation located down-slope of the work site assists in filtering out sediment. Where practicable, maintain kerb vegetation such as grass and turf strips in a healthy state during the building process. STOCKPILES ° Stockpiles and building materials should not be stored on the footpath or within the road reserve. Permission must be obtained from your Council to store materials in these areas otherwise fines may be imposed. . Minimise stockpile losses with the use of covers. ° All stockpiles and building materials should be located within the sediment control zone, for example up-slope of a sediment fence. ° Stockpiles must not be located within an overland flow Stockpiles without protection path. SERVICE TRENCHES Backfill service trenches, cap with topsoil, and compact to a level at least 75-100 mm above the adjoining ground level (either manually or with a small machine). This allows for some subsidence of the fill material, and ensures the fill is sufficiently compacted to avoid erosion at a later time. (Note that trenches must be backfilled in accordance with AS3500). EROSION CONTROL BLANKETS OR MATTING Erosion control blankets or matting can be used to minimise soil erosion and stormwater pollution from sites by: * — containing high erosion risk soils ¢ — stabilising steep slopes. SITE REHABILITATION All areas disturbed by building activities should be promptly and progressively stabilised, using techniques such as revegetation and landscaping, so they no longer act as sources of sediment. MULCHING AND GARDEN BEDS To minimise soil loss, mulch should be applied to open Rehabilitate the site promptly to reduce the chances garden beds at a depth of 75-100 mm. of further erosion This will assist in plant establishment, minimise water loss and help to control weeds. Ensure that mulch is stabilised on unstable slopes (e.g. batters and riparian areas) to avoid it washing away and ultimately entering waterways.
Page 44
MLL LL Sediment control STABILISED ENTRY/EXIT POINT (RUMBLE PAD) ¢ — Manage entry/exit point (rumble pad) so that sediment is not tracked laos off the site. ; ¢ Restrict site access to one stabilised location. * Recommended construction method for stabilising access points is a 150-200 mm deep pad of minimum 40 mm crushed rock. ¢ — The pad should be at least 2 metres wide and extend from the kerb to the building slab. ¢ Where the entry/exit pad slopes towards the road, a 200 mm high bund (hump) should be installed across the pad to deflect stormwater run-off to the side where it can be filtered by a sediment fence. Stabilised gravel entry/exit point (rumble pad) Note: The location of the permanent driveway may not be an appropriate location for the construction entrance. SEDIMENT BARRIERS/FENCES ¢ Install sediment barriers along the lower side of the soil disturbance. ¢ The most efficient sediment barrier for building sites is specially-manufactured geotextile sediment fencing. * — Sediment fences on building sites are usually wire-tied to steel or hardwood posts (wire-tied sediment fences have the advantage of being more readily unhooked from their support posts). * The support posts are spaced no greater than 2 metres apart and the sediment fence buried to a depth of 200 mm. ¢ — For public safety and sediment control Sediment fence efficiency, sediment barriers should not be located outside property boundaries without Council approval. * — Sediment barriers should only be placed on the road as a last resort. * — Sediment barriers placed in front of roadside stormwater inlets are rarely as effective as onsite controls and at best usually result in the sediment being washed down the street and into the nearest open gully inlet. * — Only use proper geotextile sediment fence fabric. Don’t use filter cloth or shade cloth. USE OF SIGNS im an Fhe Public signs that warn of the need for proper sediment control devices and c : _ maintenance are becoming more widely used. Contact your council for further . AL, information. Sediment control information signage
Page 45
MAINTENANCE OF CONTROL MEASURES All erosion, sediment and drainage control measures need to be regularly checked and maintained in good working order. Best practice includes anticipation of potential risks and being prepared for abnormal circumstances and emergencies. These measures include: * — Stockpile extra sediment fence fabric and posts on-site to facilitate emergency repairs. * — Reapply crushed rock to the entry/exit pad (rumble pad) when sediment build-up occurs. ¢ — Repair eroded drainage channels with rock, turf or erosion control blankets or matting. e — Ensure built-up sediment is removed at regular intervals from sediment barriers. * — Check and replace/repair sediment barriers daily if they are ripped, damaged or no longer anchored. Excessive sediment deposits must be removed from entry/exit point (rumble pad) and Drainage control additional crushed rock applied DIVERSION OF UP-SLOPE WATER ¢ Where practicable, divert up-slope water around the disturbed area. e — Stormwater can be diverted with the use of small turf or geotextile lined catch drains, or with the use of diversion banks. ¢ — Diverted stormwater should be discharged onto stable ground (for example turfed areas) and should not be diverted into neighbouring properties unless written permission is obtained from the land owner(s). EARLY ROOF WATER CONNECTION * Temporary or permanent downpipes should be installed as soon as practicable after the roof is laid. * Early connection of roof water to the stormwater system will reduce site wetness and the generation of on-site mud. This has been shown to reduce downtime following storm events and decrease the average building construction time. Temporary roof water connection
Page 46
MLL LL Building operations Prior to commencing building work ¢ Obtain all necessary permits, licences and approvals. ¢ Prepare a site specific Erosion and Sediment Control (ESC) Management Plan and have all necessary ESC materials available. e Avoid clearing vegetation and excavating until ready to build. e¢ Where necessary in new estates, temporary revegetation may be required. Points to consider as part of building operations * — Tool and paint washing, brick, tile or masonry cutting and water-cooled cutting activities should be done within the property boundaries. * — All waste water should be contained on-site where possible. ¢ — Activities should be carried out on a permeable surface or up-slope of an infiltration trench. * — Vehicles should not be parked on the footpath area or verge where they can damage essential vegetation and transport dirt onto the road. * Contain waste concrete washed from trucks, mixers and barrows on site; do not wash out into stormwater systems as this can clog drains and cause flooding during storm events. LITTER AND BUILDING WASTE All hard waste should be stored on-site in a way that prevents material loss caused by wind or water. Smaller materials such as litter should be contained in covered bins or litter traps formed on three sides by a geotextile wind break or similar device. When travelling to and from the site, secure load to prevent wind blown litter polluting our waterways and roadsides. One way to properly store building waste Poor litter and building waste storage SITE CLEAN-UP Remove accidental spills of soil or other materials from the road, gutter or any location outside the control of the primary sediment barrier: ¢ immediately if it is raining or likely to rain during the day * at least upon completion of the day's work (even if rainfall is unlikely during the night) * use a broom and shovel instead of hosing to clean hard surfaces. * — clean up food packaging after meal breaks as this litter can enter stormwater systems and waterways. Following storms, the road reserve and sediment barriers should be Undertake regular site clean-ups inspected and excess sediment residue removed.
Page 47
CONCRETE MIXER CLEAN-UP Fully contain concrete waste washed from trucks and mixer units on-site and store where it cannot be washed from the site, harming the environment. EXPOSED AGGREGATE CONCRETE SURFACES ¢ Builders need to demonstrate how they intend to prepare exposed aggregate surfaces without allowing cement residue to flow into stormwater drains or waterways. ¢ Where practicable, wash cement residue onto pervious surfaces or fully contain it within temporary sediment dams created from tightly stacked sand bags. ¢ When suitably dry, shovel cement residue into a waste disposal bin. ¢ — Atno time should cement residue or wastewater run-off enter the roadside gutter. This may make it impractical on some sites for exposed aggregate driveways to be constructed. In such cases, an alternative driveway finish must be used. Storage of materials on hard surfaces Whenever possible, materials should be stockpiled within the sediment control zone and, where necessary, covered with waterproof sheeting to minimise the potential for transport of sediments in stormwater. Materials may be temporarily stored on hard surfaces only where it is necessary to place erodible material on hard surfaces to undertake work and no other reasonable options are available. Don't store stockpiles on hard surfaces without suitable protection Grouped building lots When one builder controls more than one building lot, combined-lot sediment control structures may be placed down-slope if: ¢ the combined sediment control measures provide a level of protection at least equal to that provided by individual lot protection ¢ — The builder accepts responsibility for the ongoing monitoring and maintenance of sediment control devices * suitable drainage and erosion control measures are applied to each building lot ¢ — asuitable sign is placed in a prominent location outside each lot and/or at the entrance of the estate indicating such controls are in place.
Page 48
MLL LL \ Erosion and Sediment Control Management Plans Where appropriate, discuss the submission of a management plan with the appropriate building control body. These plans need to communicate to all - builders, subcontractors, private certifiers, home owners and regulators involved in the building - how stormwater pollution will be controlled on the site. EROSION AND SEDIMENT CONTROL INSTALLATION SEQUENCE 1. 2. 3. 4. 5. 6. 7. 8. 9. 1 0. Revegetate or otherwise stabilise the site. Establish a single stabilised entry/exit point (rumble pad). Install sediment fence(s) along the low side of the site. Divert up-slope water around the work site and appropriately stabilise any drainage channels. Clear only the areas necessary (maintaining vegetation on footpath). Stockpile topsoil within the sediment control zone. Stabilise exposed earth banks (for example, with vegetation or erosion control blankets). Install on-site waste receptacles (mini-skips, bins, wind-proof litter receptors). Install roof downpipes as soon as practicable after the roof is laid. Ensure that all control measures are maintained in good working order. * Stockpile is located behind the sediment fence * Stockpile has not been placed behind the sediment fence ¢ Good site planning ¢ Building waste and litter has not been placed in the skip ¢ Turf strip well maintained ¢ Poor site planning and management ¢ Sediment fence well constructed and in correct location Note: Diagrams and selected photos courtesy of Catchments & Creeks Pty Ltd.
Page 49
SUPPORTED BY >. a Teo Patong Gold Coast City Council Dedicated to a better Brisbane QMBA aN fol r le MVE ie Housing Industry Builders Association Association Ltd 417 Wickham Terrace PO Box 3573 Brisbane QLD 4000 South Brisbane OLD 4101 Ph: (07) 3404 6444 Ph: (07) 3846 1298 Fax: (07) 3832 2361 Fax: (07) 3846 3794 www.masterbuilders.asn.au www.hia.com.au Copyright 2006 These guidelines are protected by Australian copyright law. For permission to use any of the material, contact the Brisbane City Council or Gold Coast City Council. Some photographs and drawings are owned by Catchments & Creeks Pty Ltd. aaa LANG ae ees all inthe same boat _- = > - www.healthywaterways.org we ’ Tre waren aT Saat tasteemy Beesit = Treen
Used in these records
Attachment 3 - Stormwater Management Plan 1856-SBSMP-01 v5 (December 2019).pdfRelated documentApplication case desk ↗
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