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Approved Plans OPW17/0055
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BIO RETENTION BASIN CONSTRUCTION SEQUENCE NOTES:
B
THE CONSTRUCTION AND ESTABLISHMENT OF BIO RETENTION BASINS IS TO BE IN ACCORDANCE WITH COUNCILS 'INFRASTRUCTURE -
INSTALLATION AND CONSTRUCTION REQUIREMENTS MANUAL - SECTIONS 3.4 AND 8.5.1, AND STORMWATER MANAGEMENT
CONSTRUCTION AND MAINTENANCE PLAN FOR COOROY RETIREMENT COMMUNITY DATED FEB 2017 AND AS FOLLOWS:
1. CIVIL WORKS FUNCTIONAL INSTALLATION – INITIALLY THE BASIN LOCATIONS MUST BE USED AS A SEDIMENT BASINS OR TRAPS. ONCE
NOOSA COUNCIL
THERE IS 80% GROUNDCOVER OF THE UPSTREAM CATCHMENT DISCHARGING TO THE BASIN, THE FUNCTIONAL ELEMENTS OF THE
BIORETENTION DEVICES WILL BE UNDERTAKEN. THIS INCLUDES INSTALLATION OF FUNCTIONAL ELEMENTS (E.G. INLETS, OUTLETS
STRUCTURES, SUBSOIL DRAINAGE, TRANSITION LAYERS AND FILTER MEDIA) MUST BE UNDERTAKEN AS PER THE METHODOLOGY
APPROVED PLAN
DETAILED IN SECTION 3.9.1 IN THE WATER BY DESIGN CONSTRUCTION AND ESTABLISHMENT GUIDELINES (2011). THE FUNCTIONAL
ELEMENTS MUST BE PROTECTED FROM CONSTRUCTION SEDIMENT LOADS BY:
OPW17/0055 13 APR 2017 FILTER MEDIA - DEPTH 400mm SANDY
LOAM CONSISTENT WITH CURRENT B
· SEDIMENT FENCES AROUND THE PERIMETER OF THE SYSTEMS. FAWB SPECIFICATIONS
· LAYING A TEMPORARY FILTER CLOTH (OR 25MM THICK LAYER OF COURSE SAND AND 25MM OF TOPSOIL) OVER THE TRANSITION LAYER - DEPTH 100mm
BIORETENTION FILTER. THIS WILL BE KEPT IN PLACE DURING THE FINALISATION OF CIVIL WORKS AND THE BUILDING PHASE. COARSE SAND - NOMINAL PARTICLE SIZE 1mm
C.I. CAP. EXTEND CAP TO 150mm x 150mm CONCRETE
· SUBJECT TO TIMEFRAME OF BUILDING WORKS TOPSOIL CAN BE SEEDED. SURROUND TO CLEANOUT RISER LINER TO EXTEND 300mm INTO MEDIA
APPROX. 100mm ABOVE
2. BUILDING PHASE CONSTRUCTION – DURING THIS PHASE THE BIORETENTION DEVICES MUST CONTINUE TO OPERATE AS TEMPORARY AND BE FIXED TO PERIMETER OF PIT
BIO-RETENTION SURFACE.
SEDIMENT BASINS OR TRAPS. SEDIMENT FENCES MUST REMAIN AROUND THE PERIMETER OF THE SYSTEMS (BOTH AROUND THE
SCREW CAP FIXED USING 3 SCREWS
FILTER MEDIA AND THE TOP OF BATTER) TO RESTRICT SEDIMENT INFLOW. CLEAR INDICATIONS OF THE RESTRICTION OF TRAFFIC TO
STORMWATER QUALITY W.S.L.
THE BIORETENTION DEVICE MUST ALSO BE DISPLAYED.
0.30m
3. LANDSCAPE / OPERATIONAL ESTABLISHMENT – WHEN THE BUILDING PHASE IS 80% COMPLETE IN THE UPSTREAM CATCHMENT, THE EXTEND LINER 300mm
TEMPORARY PROTECTIVE MEASURES AND ACCUMULATED SEDIMENTS WITHIN THE SYSTEMS MUST BE REMOVED. THE BASIN MUST UNDER TOPSOIL AND PIN TYPE 1 FIELD INLET
BE PLANTED WITH VEGETATION AND LANDSCAPED IN ACCORDANCE WITH THE APPROVED LANDSCAPE PLANS. SUFFICIENT WATERING TO EMBANKMENT SURFACE LEVEL,
AND REMOVAL OF WEEDS FOLLOWING PLANTING MUST BE UNDERTAKEN IN ACCORDANCE WITH SECTION 3.9.3 OF THE WATER BY INVERT LEVEL, AND
50mm MIN.
SUBSOIL DRAIN CLEANOUT - PVC 0.50m
COVER
DESIGN CONSTRUCTION AND ESTABLISHMENT GUIDELINES (2011). MIN. SIZE AS SPECIFIED.
PIPE (NON SLOTTED) AND CONNECTOR
4. IN-SITU INFILTRATION TEST - AN IN-SITU INFILTRATION TEST WILL BE REQUIRED PRIOR TO PRACTICAL COMPLETION BEING GRANTED
CLEANOUTS AT HEAD OF SUBSOIL
BY COUNCIL. THE TEST WILL NEED TO ACHIEVE AN AVERAGE RATE OF 120mm/h INFILTRATION (WITHIN APPROPRIATE TOLERANCES)
50mm
DRAIN AS SHOWN ON PLAN
MIN
WITH AT LEAST 3 SAMPLE LOCATIONS AROUND THE BASIN. ANOTHER IN-SITU INFILTRATION TEST WILL BE REQUIRED FOR AT END OF
DEFECTS LIABILITY PERIOD. GRAVEL DRAINAGE LAYER
- DEPTH VARIES (200mm MIN)
TO SUIT GRADE OF SUBSOIL PIPES.
PROVIDE BIDUM A12 OR
5-7mm AGGREGATE NO FINES
BIO RETENTION PARTICLE SIZE DISTRIBUTION AND PROPERTIES GUIDE: HDPE LINER - REFER NOTE
SOURCE: (BIOFILTRATION MEDIA GUIDELINES (VERSION 3.01), PREPARED BY THE FACILITY FOR ADVANCING WATER BIOFILTRATION UPVC JOINT TO 150Ø SMOOTH WALLED SLOTTED 225Ø UNSLOTTED PVC OUTLET PIPE -
(FAWB), JUNE 2009.) & (BIO-RETENTION TECHNICAL DESIGN GUIDELINES (VERSION 1) PREPARED BY 'WATER BY DESIGN' (OCTOBER 2012) CONNECTION RISER PVC PIPE - MIN 0.5% GRADE COLLECTOR PIPE - MIN 0.5% GRADE SIZE AS SPECIFIED
TO SLOTTED PIPE AND MAX 2.5m SPACINGS
MATERIAL COMPOSITION RANGE GUIDE: FILTER MEDIA SPECIFICATION
CLAY AND SILT <3% (<0.05mm) TYPICAL BIO RETENTION BASIN SUBSOIL DRAIN
VERY FINE SAND 5-30% (0.05-0.15mm)
FINE SAND 10-30% (0.15-0.25mm)
CLEAN OUT AND FILTER MEDIA SPECIFICATIONS
MEDIUM TO COARSE SAND 40-60% (0.25-1.0mm) SCALE 1:20 (A1)
COARSE SAND 7-10% (1.0-2.0mm)
FINE SAND <3.0% (2.0-3.4mm)
WHILE TOTAL CLAY AND SILT CONTENT OF 3% IS RECOMMENDED, A CLAY AND SILT CONTENT UP TO 6% IS ACCEPTABLE PROVIDED:
· THE SATURATED HYDRAULIC CONDUCTIVITY IS BETWEEN 100mm/hr & 300mm/hr AND
· THE REMAINING MATERIAL MEETS THE COMPOSITION RANGE SPECIFIED ABOVE.
900x900 PRIMARY 900x900 SECONDARY
SOIL SPECIFICATIONS: OUTLET CONTROL PIT OUTLET CONTROL PIT
· TOTAL NITROGEN CONTENT - <1000mg/kg RL 100.15m AHD
· ORTHOPHOSPHATE CONTENT - <80mg/kg SOILS WITH TOTAL PHOSPHORUS CONCENTRATIONS >100mg/kg SHOULD BE TESTED FOR RL 100.00m AHD
POTENTIAL LEACHING. WHERE PLANTS WITH MODERATE PHOSPHORUS SENSITIVITY ARE TO BE USED, TOTAL PHOSPHORUS
CONCENTRATIONS SHOULD BE <20mg/kg) 2x Ø250 ORIFICE
· ORGANIC MATTER CONTENT - AT LEAST 3% (w/w). AN ORGANIC CONTENT LOWER THAN 3% IS LIKELY TO HAVE TOO LOW A WATER AT IL 99.40
HOLDING CAPACITY TO SUPPORT HEALTHY PLANT GROWTH. IN ORDER TO COMPLY WITH BOTH THIS AND THE TOTAL NITROGEN AND
ORTHOPHOSPHATE CONTENT REQUIREMENTS, A LOW NUTRIENT ORGANIC MATTER WILL BE REQUIRED. RL 99.40m AHD
· pH - AS SPECIFIED FOR 'NATURAL SOILS AND SOIL BLENDS' 5.5-7.5 (pH 1:5 IN WATER)
300mm
· ELECTRICAL CONDUCTIVITY - AS SPECIFIED FOR 'NATURAL SOILS AND SOIL BLENDS' <1.2 dS/m.
BIO RETENTION INSTALLATION NOTES:
THE PLACEMENT OF DRAINAGE, TRANSITION AND FILTER MEDIA LAYERS MUST BE UNDERTAKEN CAREFULLY TO ENSURE CORRECT DEPTH,
SLOPE AND COMPACTION:
DEPTH: FILTER MEDIA SHOULD BE INSTALLED AND COMPACTED IN TWO LIFTS FOR DEPTHS OVER 500mm.
SLOPE: THE TOP SURFACE OF THE DRAINAGE LAYER, TRANSITION LAYER AND FILTER MEDIA LAYER SHOULD BE FLAT. A SPREADER BAR
SHOULD LEVEL THE SURFACE OF EACH LAYER. 1 x Ø375 RCP
COMPACTION: THE FILTER MEDIA MUST BE LIGHTLY COMPACTED DURING INSTALLATION TO PREVENT THE MIGRATION OF FINE PARTICLES. THIS RL 98.00m AHD
CAN BE ACHIEVED WITH A SINGLE PASS OF A LIGHT ROLLER SUCH AS A DRUM LAWN ROLLER. A VIBRATING PLATE CAN ALSO BE USED TO
COMPACT SMALL BIO RETENTION SYSTEMS OR 'POZITRACK' LOADER CAN BE USED FOR LARGE SYSTEMS. ENSURE ONLY ONE COMPACTING
PASS IS MADE OVER THE MEDIA FOR LIGHT COMPACTION.
ROCK ARMOURING NOTES:
1. ROCKS TO BE DURABLE BLUE STONE OR OTHERWISE APPROVED BY SUPERINTENDENT. FILTER MEDIA REFER TYPICAL SUBSOIL DRAINAGE 1 x Ø300 ORIFICE
2. EACH ROCK SHALL BE: BIORETENTION DETAIL
- ANGULAR IN SHAPE (PROMOTES INTERLOCKING)
- FREE FROM OVERBURDEN, SPOIL, SHALE AND
ORGANIC MATERIAL.
3. NEITHER BREADTH NOR THICKNESS OF A SINGLE ROCK SHALL BE LESS THAN ONE HALF ITS LENGTH (ie THE ROCK SHALL BE CHUNKY NORTHERN BASIN OUTLET PIT DETAIL
RATHER THAN FLAT). SCALE 1:20 (A1)
4. ROCKS TO BE PLACED AND INTERLOCKED INTO POSITION AND BUILT UP TO FINAL LEVELS SHOWN, ENSURING COVERAGE OF SCALE 1:40 (A3)
GEOFABRIC.
5. GAPS BETWEEN THE ROCKS ARE TO BE FILLED BY DROPPING SMALL ROCKS INTO GAPS AND LOCKING INTO POSITION WITH A
CROWBAR.
6. ALL ROCKWORK TO BE PLACED OVER BIDIM A24 OR EQUIVALENT.
7. FOR ROCK SIZED SPECIFIED AS D50 ON THE DRAWINGS, THIS CORRESPONDS TO THE MEDIAN DIAMETER OF WHICH HALF OF THE ROCK
SIZES SHALL BE GREATER AND HALF OF THEM SHALL BE SMALLER. THE ROCK SHALL BE WELL GRADED AND HAVE A MAXIMUM SIZE
NO GREATER THAN 30% AND A MINIMUM SIZE NO LESS THAN 30% SMALLER THAN D50. FOR EXAMPLE IF D50 = 400mm IS SPECIFIED, THE
EQUIVALENT ROCK DIAMETER RANGES FROM 280 to 520mm.
N.S.C. REF NO. MCU15/0111 & REC15/0031
REVISION DATE ISSUE DETAILS DRAWN DESIGN DRAWN STATUS SCALE CLIENT PROJECT DRAWING TITLE
A 30.01.17 ORIGINAL ISSUE NA BF FOR APPROVAL PALM LAKE WORKS PTY LTD PALM LAKE RESORT STORMWATER QUALITY
B 14.03.17 COUNCIL RFI RESPONSE - AMENDED TO COUNCILS REQUIREMENTS BF BF NOT FOR CONSTRUCTION STAGE 4 & 5
1:20 0.2 0 0.2 0.4 0.6 0.8 1 A1
NOTES & DETAILS
DESIGN APPROVED 1:40 A3 19 TRADING POST ROAD - COOROY
ANDREW McPHAIL RPEQ 6921 PROJECT No. DRAWING No. REVISION
DISCLAIMER
C 2015 www.calibreconsulting.co
16-003302
ALL DIMENSIONS TO BE CHECKED ON SITE BY CONTRACTOR PRIOR TO
CONSTRUCTION. USE WRITTEN DIMENSIONS ONLY, DO NOT SCALE.
4702 B
FOR & ON BEHALF OF CALIBRE CONSULTING (QLD) PTY LTD
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