Council archive · source document
RFI - Attachment B - Stormwater Quality Engineering Response · 132008.1128.04
Original PDF page 1, section 1. The text section number identifies this passage in the reader.
Memorandum
Date: Monday, 31 August 2020 Pages: 5
To: Noosa Shire Council Copy: Blue Care
From: Lance May, Calibre Professional Services Ref: 18-001942
Subject: 18-001942 - Sunrise beach Interim RAC Water Quality – Response to RFI Item 3
1. Introduction
The proposed retirement and aged care development, located at Grasstree Court, Sunrise Beach is comprised of two
primary sites being the Residential Aged Care (RAC) and Retirement Living (RL) sites. The overarching water quality
investigation prepared for development (Ref: 18-001942WCSMP.01.B), approved under 132008.1128.02,was prepared
under the previous staging arrangements, which included the RAC site and part of the RL site being constructed in an
initial phase (Stage 1) with the remainder of the RL site being developed in subsequent stages. The water quality
treatment strategy is a “development wide” solution whereby the Stormwater Quality Improvement Devices (SQIDs) for
both sites contribute to the Development’s water quality treatment train.
As part of the current requested change to the Development Application the staging of the development has been
amended to remove the initial phase of the RL site from Stage 1. Noosa Council has raised an Information Request
seeking advice in relation to water quality management during the interim phase, where only the RAC is developed. This
investigation has been prepared to respond to this information request and assess specifically the performance of the
water quality treatment measures in place during the period where only the RAC site is developed and there are no works
on the RL site.
2. Modelling
2.1 Model Set-up
In order to analyse the water quality reductions achieved for the RAC site the ultimate MUSIC model for the development
was adopted and the specific nodes for the RL site were removed, leaving only the relevant RAC information.
As this assessment is an interim measure, it is proposed that the ultimate RAC SQIDs remain unchanged (in a physical
sense) such that there is no change to the ultimate water quality treatment strategy.
In addition, it was identified that there was an area of ground approximately 720m 2 in the north eastern corner of the site
that should not be identified as developable area as it is identified as an area not to be altered as part of the
development. This area includes the protected Glossy Black Cockatoo food trees and the immediately adjacent area and
root zones.
Turning Knowledge
Into Value
Page 1
See the original
The page text is free to read. Viewing or downloading an original file needs an account.
Log in to see the originalFull text of the other 12 sections
Section 2
Memorandum
18-001942 - Sunrise Beach Interim RAC Water Quality
Figure 1 - MUSIC Model Set Up
2.2 Treatment Strategy
The onsite treatment strategy proposed for the RAC site and currently included as part of the OPW design package
(extract attached) is as summarised generally follows:
1. All built ground areas are collected within an internal pipe drainage system and conveyed towards the treatment
devices at the northern boundary of the site;
2. A minimum one quarter of the roof area from the building will be diverted to a 30,000L tank with captured
rainwater being plumbed in for internal and external reuse;
3. Flows from the pipe system and rainwater tank overflow are directed to a 50m 2 bioretention basin. The inlet of
the bioretention basin includes an appropriately sized coarse sediment forebay;
4. Overflow and treated flows from the bioretention basin is directed to an infiltration basin with a floor area of
45m2.
It is noted that only within this interim MUSIC model was the infiltration basin also modelled alongside the bioretention
basin. Typically infiltration basins aren’t modelled in MUSIC within SEQ for a number of reasons including:
Turning Knowledge
Into Value
Page 2
Section 3
Memorandum
18-001942 - Sunrise Beach Interim RAC Water Quality
1. Soils in SEQ are predominantly clay and hence have low infiltration ability;
2. Generally there is minimal geotechnical investigations undertaken at the time of MUSIC modelling to validate any
infiltration assumptions and hence it is conservatively assumed that there could be a shallow ground water table
level; and
3. Infiltration basins are generally only suitable for treating TSS and GP pollutants as TN and TP can pass through
the infiltration basin into the groundwater.
For the interim period, however infiltration has been modelled as per the above MUSIC model layout. The MUSIC
Modelling Guidelines allow this infiltration to be modelled following a site based assessment ‘depending on localised soil
and groundwater conditions’ (Section 4.1. Water by Design 2010. MUSIC Modelling Guidelines).
The site based assessment has confirmed that the use of an infiltration basin is suitable on the RAC site for the following
reasons:
1. Comprehensive geotechnical investigations have been undertaken to confirm the onsite conditions are suitable
for the use of an infiltration basin being that the insitu sand has a high hydraulic conductivity and boreholes down
to two (2) metres in depth revealed no presence of a shallow groundwater condition. The vegetation identified in
the area is also consistent with a deeper ground water. The full geotechnical report has been previous provided
to Noosa Shire Council within the overarching report 18-001942.WCSMP.01.B with relevant borehole logs
attached to this memorandum.
2. Runoff from the built areas of the development are currently achieving the necessary water quality reductions for
TN and TP with the proposed 50m2 bioretention basin. The infiltration basin has been modelled for its beneficial
effects in filtering out TSS (ie. dirt and sediment) which is an inherent ability of infiltration basins as they filter
flows through the insitu sand material.
3. Results and Recommendations
After completing the required MUSIC modelling the following results were confirmed:
Firstly it was confirmed (see below Figure 2) that the built areas of the site are effectively achieving the required
reductions for TP and TN at the outlet of the bioretention basin with only TSS failing to achieve its required 80% reduction
target. This shows that the infiltration basin can be utilised for the treatment of TSS (only).
Turning Knowledge
Into Value
Page 3
Section 4
Memorandum
18-001942 - Sunrise Beach Interim RAC Water Quality
Figure 2 - Treatment Train Effectiveness at the Bioretention Basin Outlet (Prior to Infiltration)
The below figure is the MUSIC output for the treatment train effectiveness of the RAC site in the interim stage. As can be
seen the necessary 80% reduction for TSS, 60% reduction for TP, 45% reduction for TN and 90% reduction for GP are
being achieved.
Figure 3 - Treatment Train Effectiveness for the RAC Site
The above investigation has been completed to confirm the RAC site can sufficiently achieve water quality reductions for
the RAC site in the interim Stage 1. As part of future works on the RL site a large bioretention basin has been proposed
and once completed negates the need to include the above mentioned infiltration basin in the MUSIC modelling.
Erosion and sediment control measures must be suitably designed, constructed and maintained throughout the
construction phase of the development.
Turning Knowledge
Into Value
Page 4
Section 5
Memorandum
18-001942 - Sunrise Beach Interim RAC Water Quality
Calibre has undertaken the above investigations in consultation with Noosa Shire Council to assess the risk of the
development to the surrounding environment and has concluded that the water quality treatments proposed are adequate
for the site. In addition to this, it is noted these reductions have been achieved to a much higher standard than other SEQ
Councils at the request of Council Officers and also completed in accordance with the Girraween Stormwater
Management Plan, which again has meant a much higher water quality outcome has been achieved.
Should you have any further queries please don’t hesitate to contact the undersigned,
Lance May (RPEQ 19400)
Senior Engineer – Water and Environment
ATTACHMENTS
1. Bore Hole Logs
2. Engineering Drawings
Turning Knowledge
Into Value
Page 5
Section 6
BH7 Tectonic Geotechnical Pty Ltd
PO Box 899
BH8 Buderim Qld 4556
Office: 07 5478 9016
Email: [email protected]
PROJECT:
BH1 PROPOSED AGED CARE
DEVELOPMENT, GRASSTREE
COURT, SUNRISE BEACH
BH2
Grass Tree Court TITLE:
SITE PLAN
CLIENT:
BH9 BH3 CALIBRE GROUP
BH5 DRAWN: DATE:
BAZ 24/09/2018
BH10 CHECKED: DATE:
BH4 SKD 24/09/2018
BH6
SCALE:
AS SHOWN
LEGEND:
APPROX. BOREHOLE
LOCATIONS
APARTMENTS
AGED CARE COMPLEX
INFILTRATON BASINS
Scale Bar
Notes:
Imagery courtesy of Nearmap [9/9/2018] 0 40 m 80m PROJECT NO.: FIGURE: REV:
18248 1 0
Section 7
Borehole No.
BH7
Page 1 of 1
Engineering Log - Borehole Project No.: 18248
Client: Calibre Group Commenced: 12/09/2018
Project Name: Proposed Aged Care Facility Completed: 12/09/2018
Hole Location: Lot 6 - RP901384 Logged By: BZ
Hole Position: 509940.0 m E 7078812.0 m N MGA94 Zone 56 Checked By: DJQ
Drill Model and Mounting: Boxer 322D Inclination: -90° RL Surface: 28.3 m (estimated)
Hole Diameter: 90 mm Bearing: 360° Datum: AHD Operator: CSI Soil Testing
Drilling Information Soil Description Observations
Relative Density
Classification
Penetration
Pocket
Consistency
Graphic Log
Samples Material Description DCP TEST
Penetrometer
Condition
Recovery
Tests soil type: plasticity or particle characteristics,
Moisture
UCS
Symbol
Method
secondary and minor components, colour
Water
Remarks RL Depth (kPa)
(m) (m) 0 5 10 15 20 25
100
200
300
400
500
SM Silty SAND, fine to medium grained, dark grey HW
and grey, with trace of organic material VL HW
SP SAND, fine to medium grained, pale grey, with
trace of silt fines
Not Encountered
L
1 M
AS
MD
2
Hole Terminated at 2.00 m
Target depth reached
TECTONIC 2.00.2 LIB.GLB Log 1 TECTONIC BOREHOLE 18248A.GPJ <<DrawingFile>> 28/09/2018 09:42 10.0.000 Datgel Lab and In Situ Tool - DGD | Lib: Tectonic 2.00.2 2016-10-13 Prj: Tectonic 2.00 2016-02-16
3
4
5
6
Method Penetration Water Samples and Tests Moisture Condition Consistency/Relative Density
AD/T-Auger Drilling TC Bit No resistance Level (Date) U - Undisturbed Sample D - Dry VS - Very Soft
RR - Rock Roller ranging to D - Disturbed Sample M - Moist S - Soft
RD - Rotary Drilling refusal Inflow SPT - Standard Penetration Test W - Wet F - Firm
NMLC -Rock Core Partial Loss VSt - Very Stiff
HA - Hand Auger Complete Loss H - Hard
Plastic Limit VL - Very Loose
Graphic Log/Core Loss L - Loose
Classification Symbols < PL MD - Medium Dense
Core recovered (hatching and Soil Descriptions D - Dense
indicates material) = PL
Based on Unified Soil < PL VD - Very Dense
Core loss Classification System
Section 8
Borehole No.
BH8
Page 1 of 1
Engineering Log - Borehole Project No.: 18248
Client: Calibre Group Commenced: 12/09/2018
Project Name: Proposed Aged Care Facility Completed: 12/09/2018
Hole Location: Lot 6 - RP901384 Logged By: BZ
Hole Position: 509886.0 m E 7078787.0 m N MGA94 Zone 56 Checked By: DJQ
Drill Model and Mounting: Boxer 322D Inclination: -90° RL Surface: 27.0 m (estimated)
Hole Diameter: 90 mm Bearing: 360° Datum: AHD Operator: CSI Soil Testing
Drilling Information Soil Description Observations
Relative Density
Classification
Penetration
Pocket
Consistency
Graphic Log
Samples Material Description DCP TEST
Penetrometer
Condition
Recovery
Tests soil type: plasticity or particle characteristics,
Moisture
UCS
Symbol
Method
secondary and minor components, colour
Water
Remarks RL Depth (kPa)
(m) (m) 0 5 10 15 20 25
100
200
300
400
500
SM Silty SAND, fine to medium grained, dark grey HW
and grey, with organics and silt fines HW
VL HW
SP SAND, fine to medium grained, pale grey, with HW
trace of silt fines HW
Not Encountered
1 M
AS
L
MD
2
Hole Terminated at 2.00 m
Target depth reached
TECTONIC 2.00.2 LIB.GLB Log 1 TECTONIC BOREHOLE 18248A.GPJ <<DrawingFile>> 28/09/2018 09:43 10.0.000 Datgel Lab and In Situ Tool - DGD | Lib: Tectonic 2.00.2 2016-10-13 Prj: Tectonic 2.00 2016-02-16
3
4
5
6
Method Penetration Water Samples and Tests Moisture Condition Consistency/Relative Density
AD/T-Auger Drilling TC Bit No resistance Level (Date) U - Undisturbed Sample D - Dry VS - Very Soft
RR - Rock Roller ranging to D - Disturbed Sample M - Moist S - Soft
RD - Rotary Drilling refusal Inflow SPT - Standard Penetration Test W - Wet F - Firm
NMLC -Rock Core Partial Loss VSt - Very Stiff
HA - Hand Auger Complete Loss H - Hard
Plastic Limit VL - Very Loose
Graphic Log/Core Loss L - Loose
Classification Symbols < PL MD - Medium Dense
Core recovered (hatching and Soil Descriptions D - Dense
indicates material) = PL
Based on Unified Soil < PL VD - Very Dense
Core loss Classification System
Section 9
. |.
.|. ROADWORKS & DRAINAGE NOTES
.|.
PROPOSED 1.50m WIDE CONCRETE .|. 1.0m WIDE SWALE WITH 1 IN 3
FOOTPATH IN ACCORDANCE WITH
5
.|.PROPOSED
.|. .|. .|. FIRE .|. .|. .|. .|. .|.
.|. .|. TRAIL
RP890947 BATTERS AT 0.5% MIN GRADE 1. ALL DIMENSIONS ARE IN METRES UNLESS OTHERWISE SHOWN.
IPWEA STD DRG RS-065
.|. .|. .|.
.|. .|.
1/7
2. CONTRACTOR TO LIAISE WITH ALL THE RELEVANT SERVICE
AUTHORITIES TO ASCERTAIN SERVICES PRESENT ON-SITE. ANY
.|. .|.
PROPOSED SEWER ALTERATION WORKS TO SERVICES WILL BE CARRIED OUT BY THAT
.|.
(Ø375)
CONNECTION POINT SERVICE AUTHORITY ONLY.
.|.
.|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|.
.|.
) 3. THE CONTRACTOR SHALL NOTIFY THE SUPERINTENDENT PRIOR TO
.|.
0
x30
(600
.
.|. .
|.
.
1/2 COMMENCEMENT OF DEMOLISHING ANY EXISTING STRUCTURES
|.
2.600 1/3
(Ø750) |. .|
. .|.
.
5.400
|. .
TYPICAL WITHIN THE SITE AREAS.
.|. .11/1
|.
10
20
30
40
0.000
.|. . |.
95
|. .| .|. .|.
.8
4. NOT WITHSTANDING THE LIMITS OF CUTTING AND FILLING SHOWN
.|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|. .|.
(Ø5
45
) 9/1 10/1 . .|. .|.
25)
6 00 ON THE CROSS SECTIONS, THE ACTUAL LIMITS SHALL BE
(Ø
.|.
PROPOSED BIO BASIN REFER
6.200
DETERMINED ON-SITE BY THE SUPERINTENDENT DURING
.|. .|.
(Ø45
.|.
4.800 LAYOUT PLAN ON SHEET CONSTRUCTION AND SIMILARLY THE FINISHED SURFACE
.|.
0)
.|.
5002-400 FOR DETAILS
.|.
CONTOURS MAY BE ADJUSTED BY WRITTEN DIRECTION OF THE
.|.
.|.
.|.
.|.
|.
SUPERINTENDENT DURING CONSTRUCTION AFTER AMENDED
.|.
PROPOSED TYPE A HEAVY VEHICLE 50
.
2/2
|. . .|.
|. .
|.
5.400
.|.
|. .
DRAWINGS HAVE BEEN APPROVED BY COUNCIL.
.|.
|. .
CROSSING IN ACCORDANCE WITH
|.
.
.
|.
.|.
|. . .|.
IPWEA STD DRG RS-051
.|.
7/1
. |. .
.
. .
|.
|. .
5. ALL ALLOTMENT FILL IS TO BE COMPACTED TO THE REQUIREMENTS
.|.
.|.
|. .
|. .
BIO
OF AS3798-2007 AND IN ACCORDANCE WITH CURRENT SCC.
.|.
7
|.
5.400
|.|.
SPECIFICATIONS.
.
BA
|.
RP890947
.. .
|. .
G R A
.|. .|.
S
.|
.
IN
|.
|.
.|.
.|.
60 6. VERGE AND BATTERS TO HAVE A MINIMUM OF 75mm TOPSOIL AND
.|. .|. .|. PROPOSED INFILTRATION
D R I V E W A Y 2 .|. FULL WIDTH TURF IF ORDERED.
6.200
BASIN REFER LAYOUT PLAN ON
.|. .|.
SHEET 5002-400 FOR DETAILS
S S T
7. MATCH TO EXISTING AC PAVEMENT EXTENSION OR WIDENING TO
.|. |.
|. .
62 BE IN ACCORDANCE WITH IPWEA STD DRG RS-170.
.|.
.89
.
90
80
70
112.532
110
100
.|.
7
5.400
INF BA
.|.
.|.
(Ø525)
8. SUBGRADE TEST RESULTS TO BE FORWARDED TO
.|.
ILT SIN
.|.
RAC SITE SUPERINTENDENT FOR DETERMINATION OF BOX DEPTHS PRIOR TO
RA
.|. .|.
R E E
TIO
|. .|. .|. .|.
.|.
FFL: 30.600 EXCAVATION TESTS SHALL INCLUDE SOAKED CBR AND/OR OTHER
N
TESTS AS REQUESTED BY THE SUPERINTENDENT.THE
6 CONTRACTOR SHALL ALLOW ADEQUATE TIME FOR COUNCIL
27.841
RP901384 APPROVAL OF PAVEMENT DESIGN.
.|. .
0.000
10
20
PROPOSED 1.5m WIDE CONCRETE
9. LEVELS FOR KERB AND CHANNELLING/EDGE OF PAVEMENT
.|.
FOOTPATH IN ACCORDANCE WITH .|. .|. .|. .|. .|. .|. .|.
.|. CONSTRUCTION ARE AT EQUAL INTERVALS AT LIP OF CHANNEL
D R I V E W A Y 1 IPWEA STD DRG RS-065 .|.
.|. .|. .|. .|. .|.
UNLESS SHOWN OTHERWISE.
.
|. .|
6/1
.|. .
1/4 10. SIDE DRAINS TO BE CONSTRUCTED UNDER ALL KERBS AND ALL
5)
37
.|. .|. .|. .|. .|. .|. .|. KERB AND CHANNEL AS PER SCC STANDARDS. REFER TO SCC STD
(Ø
.|. .|. .|. .|. .|. DRG RS-140 FOR DETAILS.
11. ALL STORMWATER PIPES UNDER ROADWAYS AND FOOTPATHS
(Ø525)
5.400
SHALL BE CLASS '2' R.C.P R.R.J. UNLESS NOTED OTHERWISE.
PROPOSED 1.5m WIDE CONCRETE 12. THE STORMWATER PIPE CLASSES HAVE BEEN DESIGNED FOR
FOOTPATH IN ACCORDANCE WITH SERVICE LOADS ONLY, AND THE CONTRACTOR SHALL ASSESS
ANTICIPATED CONSTRUCTION LOADS AND UPGRADE THE PIPE
(Ø375) IPWEA STD DRG RS-065
1/5 5/1 CLASSES, IF NECESSARY, IN ACCORDANCE WITH A.S 3725-1989. AT
THE CONTRACTORS Section 10
COST.
3/1 1/1
(Ø52
4/1
5)
2/1 13. ALL LOTS NOT DRAINING TO A PROPERTY PIT TO HAVE 2 KERB
.|. .|. .|.
.|. .|. .|.
ADAPTORS . KERB ADAPTORS SHOWN ARE INDICATIVE ONLY AND
.|. .|. .|.
(Ø525)
.|. .|. .|.
.|. .|.
(Ø450) (Ø375)
ARE TO BE INSTALLED IN ACCORDANCE WITH SCC STD DRG RS-081.
.|. .|.
C O U
14. CONCRETE FOOTPATHS TO BE INSTALLED BY THE CIVIL
CONTRACTOR UNLESS OTHERWISE NOTED. REFER TO SCC STD
DRG RS-065 FOR CONSTRUCTION DETAILS.
PROPOSED EASEMENT WIDENING BIN WASH-DOWN AREA. DRAIN
R T
TO SANITARY PLUMBING 8
RP901384
PROPOSED WORKS
PROPOSED TYPE B HEAVY VEHICLE LEGEND PROPOSED LIMIT OF WORKS
CROSSING IN ACCORDANCE WITH
EXISTING FEATURES DESIGN CONTOURS
IPWEA STD DRG RS-051
EXISTING KERB AND CHANNEL PROPOSED EARTHWORKS PAD
EXISTING FOOTPATH CONSTRUCTED AS EXISTING KERB PROPOSED EDGE OF DECK LINE
PART OF GRASSTREE COURT PACKAGE. PROPOSED DRIVEWAY CENTRELINE
EXISTING ROAD CENTRELINE
REFER DRAWING SET 3001 FOR DETAILS .|. .|. .|. EXISTING TOP OF BANK PROPOSED TABLE DRAIN
.|. .|. .|. PROPOSED TOP OF BANK
EXISTING TOE OF BANK
EXISTING STORMWATER PROPOSED TOE OF BANK
EXISTING WATERMAIN BLOCKWORK WALL CONSTRUCTED AS
PART OF EARTHWORKS PACKAGE
EXISTING TELECOMMUNICATION
NOTES: PROPOSED STRUCTURAL WALL (BY OTHERS)
· REFER SHEET 5002-113 FOR STORMWATER EXISTING TELECOMMUNICATION
DRAINAGE LONG SECTIONS EXISTING SEWERMAIN PROPOSED STORMWATER
· REFER SHEET 5002-116 FOR STORMWATER EXISTING SEWER RISING MAIN PROPOSED SEWER
DRAINAGE STRUCTURE DETAILS
· REFER SHEET 5002-117 FOR STORMWATER PROPOSED CONCRETE PAVEMENT
DRAINAGE SPLITTER DETAILS
PROPOSED CONCRETE FOOTPATH
PROPOSED VEGETATED BATTER
FILE: 5002-106.dwg DATE: 11-01-2019 USER: SHAUN PILCHER
XREFS: X-18-001942-5002-TITLE, X-18-001942-5001-TREES, X-18-001942-5002-BASE, X-18-001942-5002-CONTS, X-18-001942-SURVEY, X-18-001942-3001-BASE
DESIGN DRAWN CHECK APPROVED DATE STATUS SCALE CLIENT PROJECT DRAWING TITLE
FIRST AMENDMENT DETAILS Calibre Professional Services (QLD) Pty Ltd
ISSUE CB NV SP SP 04.02.19
TENDER Level 3, 16 Innovation Parkway BLUE CARE SUNRISE BEACH ROADWORKS & DRAINAGE
A CB CB SP SP 14.02.19 ISSUED FOR APPROVAL Birtinya QLD Australia 4575
A
M B CR CR SP SP 09.04.20 BASIN AMENDMENTS NOT FOR CONSTRUCTION 0 2.5 5 7.5 10 12.5 15 17.5 20
Telephone 07 5314 2520
Facsimile 07 5314 2522
RESIDENTIAL AGED CARE (RAC) LAYOUT PLAN
E
C CR CR SP SP 30.07.20 ISSUED FOR TENDER
N
D
M D
APPROVED SCALE 1:250 (A1) SCALE 1:500 (A3) ROADWORKS & DRAINAGE
E BY: SHAUN PILCHER RPEQ 14593 DISCLAIMER
PROJECT No. DRAWING No. REVISION
E
N ALL DIMENSIONS TO BE CHECKED ON SITE BY CONTRACTOR
F
T
S
G SIGN: DATE: 30.07.20
C calibregroup.com PRIOR TO CONSTRUCTION. USE WRITTEN DIMENSIONS ONLY,
DO NOT SCALE.
18-001942 5002-106 C
Section 11
Section 12
Section 13
Used in these records
RFI - Attachment B - Stormwater Quality Engineering Response.pdfRelated documentApplication case desk ↗
About this file
- File size
- 5.1 MB (large file)
- File type
No other editions are linked here.
Original file
Log in to download the original file
The download may take up to a minute.