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Approved Plans OPW25-0057
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BIORETENTION SYSTEM SPECIFICATIONS 9. TRANSITION LAYER 14.4. PLANTS SUPPLIED TO SITE MUST:
TRANSITION LAYERS PREVENT FILTER MEDIA MIGRATING INTO THE DRAINAGE LAYER. 14.4.1. BE GROWN IN CLEAN, WEED- AND PEST-FREE CONDITIONS;
1. REFERENCED DOCUMENTS BIORETENTION SYSTEMS TOLERANCES 9.1. MATERIALS 14.4.2. BE WELL DEVELOPED, SUN-HARDENED AND CONTAIN A FULLY ESTABLISHED ROOT
THE FOLLOWING DOCUMENTS ARE INCORPORATED INTO THIS SPECIFICATION BY REFERENCE: BIORETENTION ELEMENT TOLERANCE (UNLESS SPECIFIED OTHERWISE) BALL THAT DOES NOT CRUMBLE WHEN REMOVED FROM ITS CONTAINER.
9.1.1. TRANSITION LAYER SHALL BE MINIMUM THICKNESS OF 100 mm COARSE SAND
1.1 STANDARDS UNLESS OTHERWISE SPECIFIED (TYPICALLY 1 mm PARTICLE SIZE DIAMETER) WITH <2% 14.4.3. BE AT LEAST 200 MM HIGH.
+ /- 25 mm (+/- 15 mm FOR STREETSCAPE
1.1.1. AS 1289 - METHODS OF TESTING SOILS FOR ENGINEERING PURPOSES HYDRAULIC STRUCTURES FINES.
SYSTEMS) 14.4.4. SHOW NO SIGN OF PEST AND DISEASE
1.1.2. AS 1289.5.4.1-2007- SOIL COMPACTION AND DENSITY TESTS--COMPACTION CONTROL 9.1.2. A PARTICLE SIZE DISTRIBUTION FOR THE SAND SHALL BE OBTAINED TO ENSURE 14.4.5. SHOW NO SIGNS OF NUTRIENT DEFICIENCY
EARTHWORKS + /-50 mm
TEST--DRY DENSITY RATIO, MOISTURE VARIATION AND MOISTURE RATIO THAT IT MEETS THE FOLLOWING CRITERIA (VICROADS).
UNDER-DRAINAGE +/- 25 mm 14.4.6. BE FREE FROM WEEDS
1.1.3. AS 1289.5.7.1-2006 - SOIL COMPACTION AND DENSITY TESTS--COMPACTION CONTROL 9.1.3. D15 (TRANSITION LAYER) ≤ 5 X D85 (FILTER MEDIA)
14.4.7. BE CLEARLY LABELLED
TEST--HILF DENSITY RATIO AND HILF MOISTURE VARIATION (RAPID METHOD) DRAINAGE AND TRANSITION LAYERS + 25 mm 9.2. TESTING
14.4.8. BE SUPPLIED IN A CONTAINER THAT IS AT LEAST: 90 MM HIGH X 50 MM WIDE
1.1.4. AS 2758 - AGGREGATES AND ROCK FOR ENGINEERING PURPOSES +/- 25 mm+/- A SAMPLE OF THE PROPOSED TRANSITION LAYER IS TO BE PROVIDED TO THE
14.5. PREPARING FILTER MEDIA: UNLESS SPECIFIED OTHERWISE, EACH PLANT MUST RECEIVE AT
1.1.5. AS 4419 - SOILS FOR LANDSCAPING AND GARDEN USE 40 mm FOR FILTER MEDIA >300 m² PROVIDED THE SUPERINTENDENT FOR APPROVAL PRIOR TO INSTALLATION. THE SUPERINTENDENT MAY
SURFACE LEVEL LEAST 10 G OF SLOW-RELEASE NATIVE FERTILIZER IN GRANULAR OR TABLET FORM.
1.1.6. AS 4454 - COMPOSTS, SOIL CONDITIONERS AND MULCHES AVERAGE EXTENDED DETENTION REQUIREMENT IS REQUIRE THE TRANSITION LAYER TO BE TESTED TO ENSURE ITS PARTICLE SIZE.
PRE-HYDRATED WATER CRYSTALS MAY BE APPLIED AT 1-2%%% BY WEIGHT.
WITHIN 25 mm OF THE DESIGN REQUIREMENT.
1.2 OTHER PUBLICATIONS 14.6. MULCH MUST BE APPLIED IN ACCORDANCE WITH THE DESIGN DRAWINGS, BE APPLIED PRIOR
1.2.1. GUIDELINES FOR SOIL FILTER MEDIA IN BIORETENTION SYSTEMS (FAWB) - THE EMBANKMENTS AND BUNDS -25 mm, + 50 mm 10. DRAINAGE LAYER TO PLANTING, PROVIDE COVERAGE OF THE SOIL AND NOT EXCEED 75 MM THICKNESS, AND
CURRENT VERSION OF THE GUIDELINE CAN BE FOUND AT http://www.monash.edu.au/fawb/ DRAINAGE LAYERS CONVEY INFILTRATED WATER INTO THE SLOTTED UNDER-DRAINAGE PIPES. BE KEPT 50 MM CLEAR OF PLANT STEMS. UNLESS OTHERWISE SPECIFIED, MULCH SHOULD
1.2.2. CONSTRUCTION AND ESTABLISHMENT GUIDELINES - SWALES, BIORETENTION BE FINE SUGAR CANE MULCH SECURED IN PLACE BY A LOOSE WEAVE JUTE NET PINNED AT
7. MAINTENANCE ACCESS 10.1 MATERIALS 500 MM CENTRES.
SYSTEMS AND WETLANDS (WATER BY DESIGN) http://waterbydesign.com.au/ceguide/
MAINTENANCE ACCESS IS PROVIDED IN ACCORDANCE WITH THE DESIGN DRAWINGS. 10.1.1. DRAINAGE LAYER SHALL BE COMPRISED OF FINE GRAVEL (NOMINAL 2-5 mm) WITH 14.7. FILTER MEDIA SURFACE AND PLANT STOCK ARE TO BE WATERED IMMEDIATELY PRIOR TO
1.2.3. TRANSFERRING OWNERSHIP OF VEGETATED STORMWATER ASSETS (WATER BY <2% FINES AND A MINIMUM SATURATED HYDRAULIC CONDUCTIVITY OF 400 mm/hr. THE
DESIGN) http://waterbydesign.com.au/transferguide/ PLANTING. UNLESS OTHERWISE SPECIFIED, PLANTS SHOULD BE PLANTED IN CLUMPS OF
DEPTH OF THE DRAINAGE LAYER SHALL ENSURE AT LEAST 50 mm OF AGGREGATE COVER THE SAME SPECIES, AND LARGE MONOCULTURES AVOIDED.
1.2.4. TRANSFERRING OWNERSHIP OF VEGETATED STORMWATER ASSETS (WATER BY 8. FILTER MEDIA OVER ALL PERFORATED UNDER-DRAINAGE PIPES.
14.8. PLANT METHOD MUST MINIMISE SOIL COMPACTION AND ENSURE THAT ALL ROOTS ARE
DESIGN) http://waterbydesign.com.au/transferguide/ 10.1.2. A PARTICLE SIZE DISTRIBUTION FOR THE GRAVEL SHALL BE OBTAINED TO ENSURE
8.1. MATERIALS COVERED BY AT LEAST 10 - 20 MM OF SOIL, AVOID COVERING PLANT CROWNS.
1.2.5. BIORETENTION TECHNICAL DESIGN GUIDELINES (WATER BY DESIGN) THAT IT MEETS THE FOLLOWING BRIDGING CRITERIA (VICROADS): D15 (DRAINAGE LAYER) ≤ 5
A FUNDAMENTAL PART OF BIORETENTION SYSTEMS IS THE FILTER MEDIA. THE MAIN ROLE OF THE 14.9. UNLESS SPECIFIED OTHERWISE, THE FOLLOWING IRRIGATION SCHEDULE APPLIES DURING
http://waterbydesign.com.au/techguide/ X D85 (TRANSITION LAYER)
FILTER MEDIA IS TO SUPPORT VEGETATION AND REMOVE POLLUTANTS. FILTER MEDIA SHOULD BE PLANT ESTABLISHMENT (AT 2.5 - 5 L PER PLANT PER WEEK) - WEEK 1-5 FIVE WATERINGS PER
1.2.6. WATER SENSITIVE URBAN DESIGN FIELD GUIDE (WATER BY DESIGN) LOAMY SAND THAT HAS HIGH PERMEABILITY WHEN COMPACTED. IT SHOULD NOT CONTAIN ANY 10.2. TESTING WEEK - WEEK 6-10 THREE WATERINGS PER WEEK - WEEK 11-15 TWO WATERINGS PER WEEK
RUBBISH OR DELETERIOUS MATERIAL. THE LOAMY SAND SHOULD CONTAIN SOME ORGANIC A SAMPLE OF THE PROPOSED DRAINAGE LAYER IS TO BE PROVIDED TO THE - THEREAFTER AS REQUIRED TO SUSTAIN PLANTS UNTIL SUCCESSFUL ESTABLISHMENT
MATTER TO IMPROVE WATER-HOLDING CAPACITY AND PLANT HEALTH, BUT IT SHOULD BE LOW IN SUPERINTENDENT FOR APPROVAL PRIOR TO INSTALLATION. THE SUPERINTENDENT MAY
2. ABBREVIATIONS AND DEFINITIONS NUTRIENT CONTENT. THE FILTER MEDIA MUST BE COMPLIANT WITH AS4419 - SOILS FOR
14.10. REPLANTING MUST OCCUR DURING THE ESTABLISHMENT PERIOD IF LESS THAN 90% OF
REQUIRE THE DRAINAGE LAYER TO BE TESTED TO ENSURE ITS PARTICLE SIZE. PLANTS SURVIVE.
2.1. THE BIORETENTION SYSTEM SPECIFICATION CONSISTS OF THE FOLLOWING ABBREVIATIONS LANDSCAPING AND GARDEN USE, AND MEET THE FOLLOWING REQUIREMENTS:
AND DEFINITIONS: 14.11. SUCCESSFUL PLANT ESTABLISHMENT IN BIORETENTION SYSTEMS IS CONSIDERED WHEN
11. UNDER-DRAINAGE THE PLANTS ARE ROBUST AND SELF-SUSTAINING, AND MEET THE FOLLOWING CRITERIA. -
2.2. FILTER: SOIL LAYER WHICH ACTS AS A POLLUTANT FILTER AND SUPPORTS PLANT GROWTH.
VEGETATION MUST COVER AT LEAST 90% OF THE BIORETENTION SURFACE WITH MULCH
2.3. IMPERMEABLE LINERS: THE LINER THAT PREVENTS WATER MOVEMENT BETWEEN THE 11.1. MATERIALS
FILTER AND THE SURROUNDING SOILS AND DEFINES THE EDGE OF THE SYSTEM.
FILTER MEDIA REQUIREMENTS COVERING THE REMAINDER (< 10% MULCH VISIBLE FROM ABOVE) - AVERAGE
EITHER SLOTTED RIGID PIPE (HDPE OR SIMILAR) OR AG-PIPE CAN BE USED FOR GROUNDCOVER PLANT HEIGHT MUST BE GREATER THAN 500 MM. - PLANTS MUST BE
TEST METHOD IN UNDER-DRAINAGE AS SPECIFIED IN THE CONSTRUCTION DRAWINGS. WHEN INSTALLING, THE HEALTHY AND FREE FROM DISEASE. - NO WEEDS OR LITTER TO BE PRESENT.
2.4. TRANSITION LAYER: LAYER TO SEPARATE FILTER LAYER FROM THE DRAINAGE LAYER TO PARAMETER REQUIREMENT
ACCORDANCE WITH FOLLOWING SPECIFICATIONS SHALL BE CONSIDERED:
AVOID MIGRATION OF SOILS FROM THE FILTER TO THE DRAINAGE LAYER
SATURATED HYDRAULIC
2.5. DRAINAGE LAYER: RELATIVELY FREE DRAINING LAYER TO CONVEY INFILTRATED WATER TO ASTM f1815-11 50 - 500 mm/hr (200 PREFERRED) 11.1.1. TYPICALLY 100 MM-SLOTTED HDPE PIPE IS THE PREFERRED TYPE OF RIGID PIPE.
CONDUCTIVITY 15. CERTIFICATION AND CHAIN OF CUSTODY
THE UNDERDRAINAGE. 11.1.2. THE SLOTS IN THE PIPE SHALL NOT ALLOW THE DRAINAGE LAYER AGGREGATE TO
pH AS 4419 5.5 - 7.5 15.1. THE FOLLOWING CERTIFICATION AND THE CHAIN OF CUSTODY APPLIES TO BIORETENTION
2.6. UNDER-DRAINS: SLOTTED DRAINS COLLECT TREATED STORMWATER FROM THE DRAINAGE FREELY ENTER THE PIPE (UNDER-DRAINAGE WITH SLOT WIDTH OF 2 mm OR SMALLER IS
ELECTRICAL CONDUCTIVITY AS 4419 <1.2 dS/m MEDIA:
LAYER AT THE BASE OF THE BIORETENTION SYSTEM. PREFERRED).
<800 mg/kg 15.1.1. THE SUPPLIER AND CONTRACTOR ARE RESPONSIBLE FOR ENSURING THE
NITROGEN CONTENT AS 4419 11.1.3 UNDER-DRAINAGE PIPES MUST NOT BE SURROUNDED BY ANY GEOFABRIC OR SOCK.
BIORETENTION MEDIA MEETS THE SPECIFICATIONS OUTLINED IN THESE GUIDELINES
3. TEST METHODS AND STANDARDS PHOSPHORUS CONTENT AS 4419 <40 mg/kg 11.2. INSTALLATION AND THAT THE CORRECT MATERIAL IS DELIVERED TO SITE. THE SUPPLIER MUST
3.1. THE FOLLOWING TEST METHODS AND STANDARDS ARE TO BE USED AS SPECIFIED IN THE 3% - 10% 11.2.1. THE MAXIMUM SPACING OF UNDER-DRAINS FOR BIO-RETENTION SYSTEMS <100 m2 IS ARRANGE FOR TESTING OF THE FILTER MEDIA BY A SOIL LABORATORY CERTIFIED
ABOVE GUIDELINES WHEN CONDUCTING TESTS ASSOCIATED WITH THIS SPECIFICATION: WHERE ORGANIC CONTENT IS 1.5 m FROM CENTRE TO CENTRE. FOR BIORETENTION SYSTEMS >100 m2 THE MAXIMUM FOR THE METHODS IN ACCORDANCE WITH THE REQUIREMENTS LISTED ABOVE. ON
BELOW THIS THRESHOLD, THE SPACING CAN BE INCREASED TO 2.0 - 2.5 m IF SPECIFIED IN THE CONSTRUCTION DRAWINGS. THE BASIS OF THE TESTING, THE SOIL LABORATORY AND SUPPLIER MUST CERTIFY
3.2. THE HYDRAULIC CONDUCTIVITY OF POTENTIAL FILTER MEDIA SHALL BE MEASURED USING THE MATERIAL MEETS THESE SPECIFICATIONS. THE SUPPLIER MUST PROVIDE THE
ORGANIC CONTENT AS 4419 FILTER MEDIA MAY BE AMELIORATED 11.2.2. THE UNDER-DRAINS SHALL BE SLOPED TOWARDS THE OUTLET PIT (MIN. 0.5%
THE ASTM F1815-11 METHOD CERTIFICATION AND LABORATORY TEST RESULTS TO THE CONTRACTOR WITH THE
BY ADDING 50 mm OF COMPOST AND LONGITUDINAL GRADE) AND THE BASE OF FILTRATION TRENCH SHALL BE FREE FROM
3.3. PARTICLE SIZE DISTRIBUTION: AS1289.3.6.1 - 1995 TINING IT INTO THE TOP 150 mm OF LOCALISED DEPRESSIONS. FOR BIORETENTION SYSTEMS WITH A SATURATED ZONE A 0% SUPPLY DOCKET.
3.4. 3.4. SOILS FOR LANDSCAPING AND GARDEN USE: AS4419 - 2003. FILTER MEDIA. PIPE GRADE IS ACCEPTABLE. 15.1.2. THE CONTRACTOR PROVIDES A COPY OF THE SUPPLIER'S CERTIFICATION, TEST
CLAY & SILT 3 - 6% (<0.05 mm) 11.2.3. ALL JUNCTIONS AND CONNECTIONS SHALL BE APPROPRIATELY SEALED. RESULTS AND SUPPLY DOCKET TO THE SITE SUPERINTENDENT OR BIORETENTION
VERY FINE SAND 5 - 30% DESIGNER FOR REVIEW.
4. MATERIALS (0.05 - 0.15 mm) 11.2.4.UNDER-DRAINAGE PIPES SHALL BE SEALED INTO THE OVERFLOW PIT.
15.1.3. FOLLOWING REVIEW OF THE CERTIFICATION, TEST RESULTS AND THE SUPPLY
4.1. MATERIALS SHALL MEET THE REQUIRED SPECIFICATIONS DETAILED IN SECTION 8 FILTER FINE SAND 10- 30% (0.15 - 0.25 mm) 11.2.5. ALL UNDER DRAINAGE PIPES TO HAVE RAISED CLEAN OUT POINTS CONSTRUCTED DOCKET, THE SITE SUPERINTENDENT OR BIORETENTION DESIGNER APPROVES
PARTICLE SIZE DISTRIBUTION AS 1289.3.6.1 - 1995 FROM NON-SLOTTED PIPES WHICH EXTEND TO 150 mm ABOVE FILTER MEDIA SURFACE
MEDIA, SECTION 9 TRANSITION LAYER, SECTION 10 DRAINAGE LAYER, SECTION 11 UNDER MEDIUM TO COARSE SAND 40- 60% INSTALLATION OF THE BIORETENTION MEDIA.
DRAINAGE, SECTION 12 PERMEABLE LINER, SECTION 13 IMPERMEABLE LINER AND SECTION (0.25 - 1.0 mm)
15.1.4. THE RELEVANT SECTIONS OF THE BIORETENTION MEDIA SIGN-OFF FORM AS PER
14 LANDSCAPING OF THIS DOCUMENT. ALL MATERIALS MUST BE CERTIFIED BY THE COARSE SAND 7 - 10% (1.0 - 2.0 mm)
SUPPLIER WITH CERTIFICATION AND DELIVERY FINE GRAVEL <3% (2.0 - 3.4%) 12. PERMEABLE LINER (WHERE SPECIFIED) THE CONSTRUCTION AND ESTABLISHMENT GUIDELINES (WATER BY DESIGN) SHOULD
BE COMPLETED AND SIGNED. THIS SIGN-OFF FORM IS PROVIDED AS PART OF THE
4.2. SUPPLY DOCKETS SHALL BE PROVIDED ON REQUEST TO CERTIFY THE MATERIAL DELIVERED 12.1. A PERMEABLE GEOTEXTILE LINER FABRIC MUST BE USED TO LINE THE OUTSIDE OF THE
CONSTRUCTION CERTIFICATION BY THE SITE SUPERINTENDENT OR BIORETENTION
IS THE MATERIAL TESTED. BIORETENTION SYSTEM.
DESIGNER.
12.2. THE LINER MUST EXTEND AT LEAST 500 mm BEYOND THE TOP OF THE SIDES AND MUST BE
SOURCE: GUIDELINES FOR SOIL FILTER MEDIA IN BIORETENTION SYSTEMS (FAWB) AND KEYED INTO BATTER AND COVERED BY AT LEAST 200 mm OF TOPSOIL.
5. TIMING AND EROSION AND SEDIMENT CONTROL BIORETENTION TECHNICAL DESIGN GUIDELINES (WATER BY DESIGN) 16. HOLD POINTS
12.3. THE LINER MUST BE RESISTANT TO ALL SOIL ACIDS AND ALKALIS, RESISTANT TO
5.1. THE TIMING OF CIVIL AND LANDSCAPE WORKS FOR BIORETENTION SYSTEMS MUST BE FILTER MEDIA MUST BE FREE OF WEEDS AND PROPAGATES. OTHER CHARACTERISTICS OF THE MICROORGANISMS AND COMPLY WITH THE REQUIREMENTS OF AS3706.12 AND AS3706.13. 16.1. THE FOLLOWING HOLD POINTS MUST BE OBSERVED IN ACCORDANCE WITH THE MOST
CAREFULLY PLANNED TO ENSURE THAT BOTH THE BIORETENTION SYSTEM AND THE FILTER MEDIA REQUIRED FOR PLANT GROWTH SHOULD BE CONFIRMED WITH A SOIL ANALYSIS OR
RECENT WATER BY DESIGN CONSTRUCTION CHECKLISTS AND SUPERINTENDENT APPROVAL
DOWNSTREAM WATERWAYS, ARE NOT IMPACTED BY STORMWATER AND SEDIMENT (E.G. CONFIRMED WITH A HORTICULTURIST/LANDSCAPE ARCHITECT.
IS REQUIRED FOR WORKS TO PROCEED:
THROUGH BEST PRACTICE EROSION AND SEDIMENT CONTROL). IN PARTICULAR, THE 13. IMPERMEABLE LINER (WHERE SPECIFIED)
16.0.1. PRESTART MEETING
DRAINAGE LAYER, TRANSITION LAYER AND FILTER MEDIA MUST NOT BE PLACED UNTIL THE 8.2. TESTING FREQUENCY 13.1. MATERIALS LINER OPTIONS INCLUDE CLAY, GEOSYNTHETIC BENTONITE CLAY LINERS OR
RISK OF HIGH SEDIMENT LOADING FROM UPSTREAM CONSTRUCTION ACTIVITIES HAS BEEN 16.0.2. COMPLETION OF HYDRAULIC STRUCTURES AND UNDER-DRAINAGE
SUITABLE FILTER MEDIA CAN BE DELIVERED TO SITE OR IMPORTED SAND CAN BE AMELIORATED HIGH-DENSITY POLY ETHYLENE (HDPE) LINERS. REFER TO THE PROJECT DRAWINGS FOR
MITIGATED. THE CONSTRUCTION SEQUENCE MUST BE APPROVED BY THE SUPERINTENDENT. LINER DETAILS. 16.0.3. PRIOR TO PLACING FILTER MEDIA
TO MEET THE ABOVE SPECIFICATION. IN EITHER CASE, THE MEDIA SHALL BE TESTED AGAINST THE
IF WITHIN MORETON BAY REGIONAL COUNCIL, THE BIORETENTION STRUCTURE SHOULD BE 16.1.4. AFTER PLACEMENT OF FILTER MEDIA (PRIOR TO APPLYING MULCH AND PLANTING).
ABOVE PARAMETERS AT ONE SAMPLE PER 500 m3 OF FILTER MEDIA. FOR SOIL SUPPLIED TO SITE, 13.2. INSTALLATION INSTALLATION MUST BE IN ACCORDANCE WITH MANUFACTURERS
TURFED DURING THE ON MAINTENANCE PERIOD AND LANDSCAPED AT THE OFF
TESTING MUST BE UNDERTAKEN ON THE ACTUAL MATERIAL TO BE DELIVERED TO THE SPECIFICATIONS AND DESIGN DRAWINGS AND ACHIEVE THE FOLLOWING:
MAINTENANCE STAGE.
BIORETENTION SYSTEM. THE SUPPLIER AND CONTRACTOR WILL BE RESPONSIBLE FOR ENSURING 13.2.1. THE LINERS SHALL BE KEYED INTO THE BATTERS AND TO THE EMBANKMENTS.
5.2. EROSION AND SEDIMENT CONTROL DURING CONSTRUCTION MUST BE DELIVERED IN THE FILTER MEDIA MEETS THE SPECIFICATION AND THE CORRECT MATERIAL IS DELIVERED TO
17. COMPLIANCE TESTING (FOR ON OR OFF MAINTENANCE)
ACCORDANCE WITH ALL LEGISLATIVE REQUIREMENTS INCLUDING, WHERE REQUIRED, THE 13.2.2.LINERS MUST BE SEALED AROUND PROTRUSIONS SUCH AS OUTLET PIPES. 17.1. COMPLIANCE TESTING MUST BE IN ACCORDANCE WITH CHAPTER 5 OF TRANSFERRING
SITE PRIOR TO INSTALLATION.
PREPARATION OF SITE-SPECIFIC ESC PLAN/S IN ACCORDANCE WITH CURRENT BEST 13.2.3 MUST ACHIEVE A MAXIMUM PERMEABILITY OF 1X10-9M/S OWNERSHIP OF VEGETATED STORMWATER ASSETS (WATER BY DESIGN). CHECKLISTS MUST
PRACTICE EROSION AND SEDIMENT CONTROL (E.G. IECA 2008, OR LATER VERSION). BE COMPLETED AND SIGNED BY THE SUPERINTENDENT.
8.3. INSTALLATION AND COMPACTION
WHEN INSTALLING, THE FOLLOWING SPECIFICATIONS SHALL BE APPLIED: 14. LANDSCAPING
6. EARTHWORKS AND HYDRAULIC STRUCTURES 14.0. REFER TO LANDSCAPE DESIGN DRAWINGS.
DISCLAIMER: IT IS THE RESPONSIBILITY OF THE CERTIFYING REGISTERED PROFESSIONAL
8.3.1. FILTER MEDIA SHALL BE INSTALLED AND COMPACTED IN TWO LIFTS FOR DEPTHS OF OVER ENGINEER TO ENSURE THESE STANDARD NOTES ARE ADAPTED TO THE SPECIFIC NEEDS OF THE
6.1. THE CONSTRUCTION OF HYDRAULIC STRUCTURES MUST ENSURE THE DESIGN LEVELS ARE 500 mm. COMPACTION SHALL BE LIGHT AND EVEN ACROSS THE SURFACE. 14.1. BATTER SLOPES MUST HAVE MIN 200 mm TOPSOIL WHICH MUST BE TESTED BY A
ACHIEVED. BUNDS/ EMBANKMENTS SURROUNDING THE SYSTEM SHALL BE AT CORRECT PROJECT. IT IS EXPECTED THAT ADDITIONAL DRAWING NOTES WOULD BE REQUIRED TO COVER
8.3.2. THE TOP SURFACE OF THE DRAINAGE LAYER, TRANSITION LAYER AND THE FILTER MEDIA NATA-ACCREDITED LABORATORY IN ACCORDANCE WITH AS 4419. OTHER IMPORTANT PROJECT ISSUES (E.G. WORKPLACE HEALTH AND SAFETY, ENVIRONMENTAL
LEVELS. THE BELOW TABLE SUMMARISES THE CONSTRUCTION TOLERANCES FOR EACH
ELEMENT OF A TYPICAL BIORETENTION SYSTEM. LAYER SHALL BE LEVEL AND FREE FROM LOCALISED DEPRESSIONS TO ENSURE EVEN 14.2. SUBSOILS TO BE CULTIVATED TO 150 mm PRIOR TO PLACING TOPSOIL ON BATTER SLOPES. PROTECTION, EROSION AND SEDIMENT CONTROL, ETC). HEALTHY WATERWAYS, IPWEA AND ALL
DISTRIBUTION OF STORMWATER FLOWS ACROSS THE SURFACE AND PREVENT LOCALISED 14.3. PLANTING DENSITIES AND SPECIES MUST BE CONSISTENT WITH THE LANDSCAPE DESIGN CONTRIBUTORS TO THIS DOCUMENT ACCEPT NO LIABILITY FOR THE USE, MISUSE OR ANY
6.2. BIORETENTION SYSTEMS TOLERANCES (SEE CHART BELOW) OMISSION OR INACCURACY IN THIS DOCUMENT.
PONDING. DRAWINGS. NO SUBSTITUTIONS SHOULD BE MADE UNLESS APPROVED BY THE
- 8.3.3. FILTER FABRIC MUST NOT BE USED BETWEEN DRAINAGE LAYER, TRANSITION LAYER AND SUPERINTENDENT.
THE FILTER MEDIA LAYERS OR WRAPPED AROUND THE UNDER-DRAINAGE Check all dimensions before commencement of work.
APPROVED PLAN IT IS THE RESPONSIBILITY OF THE Check Site boundary dimensions from the Title plans
Check Building Boundary clearances by set out.
CONTRACTOR TO CONTACT THE RELEVANT
OPW25/0057 AUTHORITIES TO CONFIRM THE LOCATION OF Notwithstanding the information supplied on this drawing,
the location, depth and extent of underground or overhead
ALL EXISTING SERVICES PRIOR TO THE
NOOSA COUNCIL COMMENCEMENT OF EXCAVATION services are to be confirmed and protected on site by the
contractor prior to commencement of works.
20 AUG 2025 Approved
Checked - CT Drawing title - Project - PROPOSED 1 INTO 3 Site - Project No. 233467 Sheet No. C362
Design - SK Drawn - SK D 24/03/2025 UPDATED PROJECT NAME SK BIORETENTION BASIN NOTES DEVELOPMENT 62 LAKE MACDONALD DRIVE, Digital Ref :
C362 BIORETENTION BASIN
NOTES Issue : D
C 14/03/2025 UPDATED LOT LAYOUT SK
Scales - AS SHOWN B 20/09/2024 ISSUE FOR APPROVAL SK COVEY ASSOCIATES PTY LTD 124 DUPORTH AVENUE Client -
NOOSA COUNCIL COOROY This Document is copyright and shall not be copied
A 10/01/24 ISSUE FOR CLIENT REVIEW SK
ABN 59 137 305 992 PO BOX 16 without written approval, nor shall it be used except
Document Stage - APPROVAL (07) 5443 7777 MAROOCHYDORE QLD 4558 for the Development and the Site Specified.
Issue Date Description By [email protected]
c:\12dS\data\12DSERVER\233467_2957\DWG Covey\OPW\Uncontrolled\C362 BIORETENTION BASIN NOTES.dwg Plot 4 July 2025 - 5:07 PM
Document Set ID: 23931062
Version: 1, Version Date: 15/07/2025
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