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Attachment 7- Site Based Stormwater Management Plan
Attached to the e-mail Response to Information Request - 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 2.0
April 2019
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Page 2
DOCUMENT INFORMATION
Document Title: Site-Based Stormwater Management Plan
Document Reference No. 1856-SBSMP-01 – Version 2.0
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
“©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”
Page 3
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 125m2 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.
Page 4
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 ...................................................................................................... 17 6.0 LIMITATIONS OF THIS REPORT......................................................................... 18 7.0 REFERENCES...................................................................................................... 19 8.0 CLOSURE ............................................................................................................ 20
Page 5
APPENDICES APPENDIX A - Preliminary Plans by Barlow Shelley Consulting Engineers APPENDIX B - Stormwater Quality Objectives – Construction Phase
Page 6
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 20 1856-SBSMP-01_Version 2.0 (April 2019)
Page 9
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. Site Based Stormwater Management Plan Page 4 of 20 1856-SBSMP-01_Version 2.0 (April 2019)
Page 10
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 20 1856-SBSMP-01_Version 2.0 (April 2019)
Page 12
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 20 1856-SBSMP-01_Version 2.0 (April 2019)
Page 13
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 20 1856-SBSMP-01_Version 2.0 (April 2019)
Page 15
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 (taken
from the guidelines).
Surface Type % Imperviousness
Road Reserve 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.
Node Area (ha)
West Hofmann Drive C1 0.1150
West Hofmann Drive C2 0.2545
West Hofmann Drive C3 0.1250
Road A 0.2265
Road A Bypass 0.0270
Road B 0.4070
Driveway and Reserve 0.2270
Total 1.3820
Table 4.3 Surface Area of Nodes
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.
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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 (Industrial)
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 0.45 -1.11 0.48 0.14 0.20
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 0.44 -0.30 0.36 0.25 0.32
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 4.3 and Figure 4.5 show the parameters for the bioretention basins.
Figure 4.3 Bioretention node parameters Street Tree Pit West Hofmann Drive C1
Figure 4.4 Bioretention node parameters West Hofmann Drive C2
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Figure 4.5 Bioretention node parameters West Hofmann Drive C3
Figure 4.6 Bioretention node parameters Road A
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Figure 4.7 Bioretention node parameters Street Tree Pits Road B
Figure 4.8 Bioretention node parameters Driveway and Reserve
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Vegetated Swale
Figure 4.9 shows the parameters for the vegetated swale node in the MUSIC model.
Figure 4.9 Vegetated Swale Node Parameters
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4.3.6 MUSIC Model Results
Figure 4.10 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 4.10 MUSIC Model Results
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.
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Page 22
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 Bioretention basin (total area) = 125m2
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 18 of 20 1856-SBSMP-01_Version 2.0 (April 2019)
Page 24
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 19 of 20 1856-SBSMP-01_Version 2.0 (April 2019)
Page 25
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 20 of 20 1856-SBSMP-01_Version 2.0 (April 2019)
Page 26
Appendix
Preliminary Plans by Barlow Shelley Consulting Engineers
- Drawings 1856/SW01-SW05
Prepared by Barlow Shelley Consulting Engineers
Page 27
RIVE
ANN D
HOFM RO E
AD
SWALE 20m BIO-RETENTION IV
R
A BASIN 20m² D
Y
A
H
ER
LT
A
W
ROAD B
TREE PITS 15m² TREE PITS 15m²
LOT 16
4525m²
B
AD
RO
LOT 10
4733m²
EXISTING
ROUNDABOUT
LOT 13
LOT 11
4117m²
4999m²
LOT 12
7972m²
E
IV
R
D
Y
A
H
ER
LT
A
W
LEGEND - EXISTING SERVICES
EXISTING SEWER DN225 uPVC SN8
EXISTING SEWER DN150 uPVC SN8
EXISTING DN150 OPVC PN16 WATERMAIN
EXISTING DN250 DI PN35 WATERMAIN
EXISTING DN610 WATERMAIN
LEGEND - NEW WORKS EXTENT
EXTENT OF AC SEAL
EXTENT OF CUT EARTHWORKS
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY
E
RIV
ROAD CENTRELINE
YD
STORMWATER DRAINAGE
HA
R
PROJECT: JOB NUMBER
TE
REV DATE DESCRIPTION BY CHKD DRAWN
I GDETAL
IS SCALE APPROVED PROPOSED SUBDIVISION 1856
AL
AT WALTER HAY DRIVE, NOOSAVILLE
W
DATUM AHD SHEET: OF
DESIGN MM
0 10 20 30 40 50m ................. FOR STOCKWELL PTY LTD
1 7
Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
(RPEQ 19358)
SCALE 1:1000 A3 p 07 5443 8285 STORMWATER LAYOUT PLAN 1 OF 6
DESIGN CHECK CL
DRAWING STATUS e [email protected] w www.barlowshelley.com.au
SW01
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL a PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Barlow Shelley Consulting Engineers
Page 28
BIO-RETENTION
BASIN 30m²
BIO-RETENTION LOT 4
BASIN 20m² 2365m²
HO
FM
AN
N
DR
IV
E
LOT 5 BIO-RETENTION
2307m² BASIN 20m²
LOT 6 LOT 8
2473m² 3257m²
LOT 15
4247m² LOT 9
3274m²
RIVE
ANN D
HOFM RO
TREE PITS 15m² AD
A
TREE PITS 5m²
ROAD B
TREE PITS 15m²
LOT 16
4525m²
LOT 14
4005m²
B
AD
RO
LOT 10
4733m²
LEGEND - EXISTING SERVICES
EXISTING
EXISTING SEWER DN225 uPVC SN8
ROUNDABOUT
EXISTING SEWER DN150 uPVC SN8
EXISTING DN150 OPVC PN16 WATERMAIN
EXISTING DN250 DI PN35 WATERMAIN
EXISTING DN610 WATERMAIN
LOT 13 LEGEND - NEW WORKS EXTENT
LOT 11
4117m²
4999m²
EXTENT OF AC SEAL
EXTENT OF CUT EARTHWORKS
LOT 12
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
7972m²
EXTENT OF 2m WIDE CONCRETE FOOTPATH
E
IV
R
D
Y EXTENT OF COMMERICAL DRIVEWAY
A
H
ER
LT ROAD CENTRELINE
A
W STORMWATER DRAINAGE
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD DRAWN
I GDETAL
IS SCALE APPROVED PROPOSED SUBDIVISION 1856
AT WALTER HAY DRIVE, NOOSAVILLE
DATUM AHD SHEET: OF
DESIGN MM
0 10 20 30 40 50m ................. FOR STOCKWELL PTY LTD
2 7
Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
(RPEQ 19358)
SCALE 1:1000 A3 p 07 5443 8285 STORMWATER LAYOUT PLAN 2 OF 6
DESIGN CHECK CL
DRAWING STATUS e [email protected] w www.barlowshelley.com.au
SW02
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL a PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Barlow Shelley Consulting Engineers
Page 29
HO
FM
LOT 21
4288m²
AN
N
DR
IV
E
FH
LOT 20
2149m²
LOT 19
2235m²
LOT 18
2542m²
LOT 17
2716m²
LEGEND - EXISTING SERVICES
EXISTING SEWER DN225 uPVC SN8
EXISTING SEWER DN150 uPVC SN8
EXISTING DN150 OPVC PN16 WATERMAIN
EXISTING DN250 DI PN35 WATERMAIN
EXISTING DN610 WATERMAIN H
O
FM
LEGEND - NEW WORKS EXTENT A
N
N
D
EXTENT OF AC SEAL R
IV
E
EXTENT OF CUT EARTHWORKS
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY 60
3.
S
N
ROAD CENTRELINE
STORMWATER DRAINAGE
LOT 4
2365m²
HO
PROJECT: JOB NUMBER
F
REV DATE DESCRIPTION BY CHKD DRAWN
I GDETAL
IS SCALE APPROVED
M
PROPOSED SUBDIVISION 1856
AN
AT WALTER HAY DRIVE, NOOSAVILLE
N
DATUM AHD SHEET: OF
................. 3 6
DR
DESIGN MM
0 10 20 30 40 50m FOR STOCKWELL PTY LTD
IV
DRAWING NUMBER REV
E
Director: CAMERON LANDRETH DRAWING TITLE:
DRAWN MM
(RPEQ 19358)
SCALE 1:1000 A3 p 07 5443 8285 STORMWATER LAYOUT PLAN 3 OF 6
DESIGN CHECK CL
DRAWING STATUS e [email protected] w www.barlowshelley.com.au
SW03
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL a PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Barlow Shelley Consulting Engineers
Page 30
EE
NI
E
CR
EE
K
RO
AD
U
LOT 2
N
-N
9550m²
AM
ED
R
O
AD
EXISTING
ROUNDABOUT
D
OA
DR
ME
-NA
UN
LEGEND - EXISTING SERVICES
EXISTING SEWER DN225 uPVC SN8
EXISTING SEWER DN150 uPVC SN8
EXISTING DN150 OPVC PN16 WATERMAIN
EXISTING DN250 DI PN35 WATERMAIN
EXISTING DN610 WATERMAIN
LEGEND - NEW WORKS EXTENT
RIVE
HAY D
EXTENT OF AC SEAL
ER
EXTENT OF CUT EARTHWORKS
WALT
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY
ROAD CENTRELINE
STORMWATER DRAINAGE
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD DRAWN
I GDETAL
IS SCALE APPROVED PROPOSED SUBDIVISION 1856
AT WALTER HAY DRIVE, NOOSAVILLE
DATUM AHD SHEET: OF
DESIGN MM
0 10 20 30 40 50m ................. FOR STOCKWELL PTY LTD
4 6
Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
(RPEQ 19358)
SCALE 1:1000 A3 p 07 5443 8285 STORMWATER LAYOUT PLAN 4 OF 6
DESIGN CHECK CL
DRAWING STATUS e [email protected] w www.barlowshelley.com.au
SW04
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL a PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Barlow Shelley Consulting Engineers
Page 31
K
RO
AD
LOT 23
5055m²
LOT 24
6079m²
LOT 25
1.497 Ha
EE
NI
E
CR
EE
K
RO
AD
LEGEND - EXISTING SERVICES
EXISTING SEWER DN225 uPVC SN8
EXISTING SEWER DN150 uPVC SN8
EXISTING DN150 OPVC PN16 WATERMAIN
U
LOT 2 EXISTING DN250 DI PN35 WATERMAIN
N
-N
9550m²
EXISTING DN610 WATERMAIN
AM
ED
LEGEND - NEW WORKS EXTENT
R
O
AD
EXTENT OF AC SEAL
EXTENT OF CUT EARTHWORKS
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY
ROAD CENTRELINE
EXISTING
ROUNDABOUT STORMWATER DRAINAGE
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD DRAWN
I GDETAL
IS SCALE APPROVED PROPOSED SUBDIVISION 1856
AT WALTER HAY DRIVE, NOOSAVILLE
DATUM AHD SHEET: OF
DESIGN MM
0 10 20 30 40 50m ................. FOR STOCKWELL PTY LTD
5 6
Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
(RPEQ 19358)
SCALE 1:1000 A3 p 07 5443 8285 STORMWATER LAYOUT PLAN 5 OF 6
DESIGN CHECK CL
DRAWING STATUS e [email protected] w www.barlowshelley.com.au
SW05
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL a PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Barlow Shelley Consulting Engineers
Page 32
EE
NI
E
CR
EE
K
RO
AD
EE
LOT 22 NI
E
3827m² CR
EE
K
RO
AD
DRIVE
NN
FMA NEW SEWER CONNECTION FROM
HO EXISTING SEWER MANHOLE
N N
MA PRE-TAP CONNECTION
HOF FROM EXISTING DN250
WATERMAIN FOR LOT 22
LEGEND - EXISTING SERVICES
UN EXISTING SEWER DN225 uPVC SN8
-N EXISTING SEWER DN150 uPVC SN8
AM
ED EXISTING DN150 OPVC PN16 WATERMAIN
RO
AD EXISTING DN250 DI PN35 WATERMAIN
EXISTING DN610 WATERMAIN
LEGEND - NEW WORKS EXTENT
EXTENT OF AC SEAL
EXTENT OF CUT EARTHWORKS
KERB & CHANNEL (B1 TYPE 450mm CHANNEL)
EXTENT OF 2m WIDE CONCRETE FOOTPATH
EXTENT OF COMMERICAL DRIVEWAY
ROAD CENTRELINE
STORMWATER DRAINAGE
PROJECT: JOB NUMBER
REV DATE DESCRIPTION BY CHKD DRAWN
I GDETAL
IS SCALE APPROVED PROPOSED SUBDIVISION 1856
AT WALTER HAY DRIVE, NOOSAVILLE
DATUM AHD SHEET: OF
DESIGN MM
0 10 20 30 40 50m ................. FOR STOCKWELL PTY LTD
6 6
Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
(RPEQ 19358)
SCALE 1:1000 A3 p 07 5443 8285 STORMWATER LAYOUT PLAN 6 OF 6
DESIGN CHECK CL
DRAWING STATUS e [email protected] w www.barlowshelley.com.au
SW06
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL a PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Barlow Shelley Consulting Engineers
Page 33
1.5m 2.0m 1.0m
TEMPORARY TURF
RL = + 500MM FROM
FILTER MATERIAL
50mm TOP SOIL
0.300
MIN
1:3
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)
100Ø SUBSOIL
DRAINAGE PIPES
BIORETENTION DETAIL
POLY LINER NOT TO SCALE
BIO-RETENTION - TYPICAL SECTION
NOT TO SCALE
FIELD INLET PIT TYPE 1
FILTER CLOTH OR ORGANIC GEOTEXTILE MATTING FIXED TO WITHOUT CONCRETE
PERIMETER OF WALLS TO AVOID RUNNELLING OF WATER APRON (IPWEA STD DWG
PROPOSED EDGE D-0050
RESTRAINT (ER2 TYPE) BETWEEN PIT AND SOIL INTERFACE. 300 WIDE, 100 COVER. OVERFLOW PIT 300mm
FUTURE PLANTING TO ABOVE BIORETENTION FSL
C.I. CAP TO EXTEND
APPROX. 150mm ABOVE LANDSCAPE PLANS MEDIA LEVEL TEMPORARY TURF
BASIN SURFACE AND TOP SOIL
3%> <3%
BIORETENTION 600
100
1:4 FILTER MEDIA
1:4
COARSE SAND 100
5-10mm GRAVEL 200
Ø100 - Ø150 SLOTTED
PVC DRAINS CONNECT Ø375 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 DRAWN
I GDETAL
IS SCALE APPROVED PROPOSED SUBDIVISION 1856
AT WALTER HAY DRIVE, NOOSAVILLE
DATUM AHD SHEET: OF
DESIGN MM
0 50 100 150 200 250m ................. FOR STOCKWELL PTY LTD
7 7
Director: CAMERON LANDRETH DRAWING TITLE: DRAWING NUMBER REV
DRAWN MM
(RPEQ 19358)
SCALE 1:5000 A3 p 07 5443 8285 TYPICAL STORMWATER SECTIONS
DESIGN CHECK CL
DRAWING STATUS e [email protected] w www.barlowshelley.com.au
SW07
This drawing is not to be copied or amended without written permission from
DATE 21-02-19 FOR APPROVAL a PO Box 899, Maroochydore,4558 ABN 89 215 591 077
Barlow Shelley Consulting Engineers
Page 34
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 35
Appendix 2 — Stormwater management design objectives Table A: Construction phase — stormwater management design objectives Application: © Applies to all climatic regions. Part 1 Construction phase — stormwater management design objectives Issue Desired outcomes Drainage control 1, Manage stormwater flows around or through areas of exposed soil to avoid contamination. 2. Manage sheet flows in order to avoid or minimise the generation of rill or gully erosion. 3. Provide stable concentrated flow paths to achieve the construction phase stormwater management design objectives for temporary drainage works (part 2). 4. Provide emergency spillways for sediment basins to achieve the construction phase stormwater management design objectives for emergency spillways on temporary sediment basins (part 3). Erosion control 1, Stage clearing and construction works to minimise the area of exposed soil at any one time. 2. Effectively cover or stabilise exposed soils prior to predicted rainfall. 3. Prior to completion of works for the development, and prior to removal of sediment controls, all site surfaces must be effectively stabilised* using methods which will achieve effective short-term stabilisation. Sediment control 1. Direct runoff from exposed site soils to sediment controls that are appropriate to the extent of disturbance and level of erosion risk. 2. Allexposed areas greater than 2500 metres? must be provided with sediment controls which are designed, implemented and maintained to a standard which would achieve at least 80% of the average annual runoff volume of the contributing catchment treated (i.e. 80% hydrological effectiveness) to 50mg/L Total Suspended Solids (TSS) or less, and pH in the range (6.5-8.5). Litter, hydrocarbons and other 1. Remove gross pollutants and litter. contaminants 2. Avoid the release of oil or visible sheen to released waters. 3. Dispose of waste containing contaminants at authorised facilities. Waterway stability and flood 1. Where measures are required to meet post-construction waterway stability objectives flow management (specified in table B), these are either installed prior to land disturbance and are integrated with erosion and sediment controls, or equivalent alternative measures are implemented during construction. 2. Earthworks and the implementation of erosion and sediment controls are undertaken in ways which ensure flooding characteristics (including stormwater quantity characteristics) external to the development site are not worsened during construction for all events up to and including the 1 in 100 year ARI (1% AEP). ® Note: Drainage, erosion and sediment controls should be appropriate to the risk posed by the activity for the relevant climatic region e.g. considering the potential soil loss rate, monthly erosivity or average monthly rainfall. © Note: An effectively stabilised surface is defined as one that does not, oris not likely to result in visible evidence of soil loss caused by sheet, rill or gully erosion or lead to sedimentation water contamination. page 80
Page 36
Part 2: Construction phase — stormwater management design objectives for temporary drainage works Ue AACE Eton eed eta ice eee Cem oe LiLe| PU Tees pee wi eliidird Phe smelt) pee Muar Drainage structure 1in 2 year 1in5 year 1in 10 year ARI/39% AEP AR1/18% AEP ARI/10% AEP Where located immediately up-slope of an occupied 1in 10 year ARI/10% AEP property that would be adversely affected by the failure or overtopping of the structure Culvert crossing 1in1year ARI/63% AEP Part 3: Construction phase — stormwater management design objectives for emergency spillways on temporary sediment basins Drainage structure Anticipated operation design life and PES Reus Beaudry PEM Cy rd 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 37
Table B: Post construction phase — stormwater management design objectives Application: (a) 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. fete teressatei) Design objectives Reductions in mean annual load from unmitigated development (%) Total Total Total foro) Waterway stability STs eT (| phosphorus aces 4) POU CMU CLE lil’ solids (TSS) (TP) (TN) PT South East Queensland 80 60 45 90 Limit the peak 1-year ARI event discharge within the receiving Central Queensland (north) 75 60 4o%s 90 waterway to the pre-development peak Central Queensland (south) 85 60 45 90 Cape YANKS, wet tropics and 80 60% 40 90 1-year ARI discharge dry tropics Western Queensland’ 85 60 45 go 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
Controlling stormwater pollution on your building site raat Ua, Ce ul Wee TE 7 F | a
Page 39
a Le LT ya
a | x | : |
av Pe os ea ‘ 7
cy Introduction
What are the impacts?.............:-. ETS 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
residential building sites.......... Pee
Ula VT ce at palsa0) £211) ieee aS eae eee Pa
The following fact sheets provide practical examples
of recommended control measures. Included is an easy-
to-follow daily site checklist to guide site supervisors.
Erosion controls. .
Sediment control.........-..--
5 a Erosion and sediment contro! daily site check list
ie} |ay- le |= al eo) a) so) RP area rarer eer a eye ee
@® Erosion and sediment control on residential
1=0T] Ce Tate Me) 0-1 6-1 (¢) «era 4 building sites
Erosion control
@ Sediment control
Drainage control
Erosion and Sediment Control] Management Plans . . . Building operations
Storage of materials on hard surfaces..............
Grouped building lots...........
@ Storage of materials on hard surfaces
@ Grouped building lots
@ Erosion and Sediment Control Management Plans
CUTE) 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 control 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
reduced stockpile losses
reduced clean-up costs
a better public image
more marketable sites
fewer public complaints
reduced risk of fines
better fishing for everyone
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 40
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 e 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 ¢ 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 41
on your building site : rs 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. Sediment Control Zone 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 measure or device: 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. 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 42
Erosion controls eazam=z 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 path. Stockpiles without protection 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 contro! blankets or matting can be used to minimise soil erosion and stormwater pollution from sites by: * containing high erosion risk soils ¢ — stabilising steep slopes. 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 43
ay La site Sediment control STABILISED ENTRY/EXIT POINT (RUMBLE PAD) ¢ Manage entry/exit point (rumble pad) so that sediment is not tracked 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. Note: The location of the permanent driveway may not be an appropriate location for the construction entrance. ¢ — Install sediment barriers along the lower side of the soil disturbance. Stabilised gravel entry/exit point (rumble pad) © 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 efficiency, sediment barriers should not be located outside property boundaries without Council approval. Sediment fence ¢ 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 Public signs that warn of the need for proper sediment control devices and maintenance are becoming more widely used. Contact your council for further information. Sediment control information signage
Page 44
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. ¢ — 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. 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. © — 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 45
on your building site . fe 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. © 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. 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 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 46
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.
¢ 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.
e 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 eezzz
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 contro] measures are applied to each building lot
¢ a suitable sign is placed in a prominent location outside each lot and/or at the entrance of the
estate indicating such controls are in place.