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16-003302-4702
From the archive 16-003302- Stage 4&5.zip, inside Operational Works Application OPW17/0055. File date in the archive: 2017-02-10 15:27.
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BIO RETENTION BASIN CONSTRUCTION SEQUENCE NOTES:
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, STAGED AS FOLLOWS:
1. FUNCTIONAL INSTALLATION - BASIN CONSTRUCTION INCLUDING EARTHWORKS, INLETS, OUTLET STRUCTURES, SUBSOIL DRAINAGE,
TRANSITION LAYERS, FILTER MATERIAL, PROTECTIVE LAYERS AND EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE
UNDERTAKEN BY THE CIVIL CONTRACTOR. THE FILTER MEDIA WITHIN THE BIO RETENTION BASIN IS TO BE COVERED WITH A
PROTECTIVE GEOFABRIC LAYER (BIDIM A12 OR EQUIVALENT), THEN COVERED WITH 75MM OF TOPSOIL AND TURFED OR GRASS
SEEDED TO THE SATISFACTION OF COUNCIL. SILT FENCES ARE TO BE ERECTED AROUND THE OUTSIDE OF THE BASIN. BASIN WITH
PROTECTIVE LAYERS TO BE UTILISED AS A SEDIMENT BASIN FOR THE DURATION OF SUBDIVISION WORKS AND TO COMPLETION OF FILTER MEDIA - DEPTH 600mm SANDY
BUILDING CONSTRUCTION PHASE. ACCEPTANCE OF THE COMPLETED SUBDIVISION WORKS ON AND OFF MAINTENANCE BY COUNCIL IS LOAM CONSISTENT WITH CURRENT
TO EXCLUDE THE PROTECTIVE LAYERS WITHIN THE BIO BASINS. CONTRACTOR TO ENSURE INVERT LEVELS OF ALL SUBSOIL DRAINS FAWB SPECIFICATIONS
ARE SURVEYED PRIOR TO PLACING TRANSITION LAYER TO CONFIRM A MINIMUM 0.50% GRADE AND SUPPLY WITH AS CONSTRUCTED TRANSITION LAYER - DEPTH 100mm
DOCUMENTATION. COARSE SAND - NOMINAL PARTICLE SIZE 1mm
2. BUILDING CONSTRUCTION - THE PROTECTIVE GEOFABRIC AND GRASS LAYER AND THE EROSION AND SEDIMENT CONTROL MEASURES C.I. CAP. EXTEND CAP TO 150mm x 150mm CONCRETE
ARE TO REMAIN IN PLACE DURING THE BUILDING CONSTRUCTION PHASE. THE BUILDING CONSTRUCTION PHASE IS TO BE THE TIME APPROX. 100mm ABOVE SURROUND TO CLEANOUT RISER LINER TO EXTEND 300mm INTO MEDIA
FOR COMPLETION OF 75% OF THE BUILDING CONSTRUCTION AND SITE ESTABLISHMENT WORKS ON ALLOTMENTS OR 12 MONTHS BIO-RETENTION SURFACE. AND BE FIXED TO PERIMETER OF PIT
FOLLOWING HAND OVER OF ROAD TO COUNCIL (FROM A SUCCESSFUL OFF MAINTENANCE INSPECTION) AND SUBJECT TO SCREW CAP FIXED USING 3 SCREWS
SUCCESSFUL INFILTRATION TEST (REFER NOTE 4 FOR DETAILS), WHICHEVER IS SHORTER. THE MAINTENANCE OF THE BASINS STORMWATER QUALITY W.S.L.
INCLUDING INLETS, OUTLETS AND EROSION AND SEDIMENT CONTROL MEASURES IS TO BE UNDERTAKEN BY THE CIVIL CONTRACTOR
0.30m
FOR THE DURATION OF THE BUILDING CONSTRUCTION PHASE. EXTEND LINER 300mm
3. OPERATIONAL ESTABLISHMENT - FOLLOWING COMPLETION OF THE BUILDING CONSTRUCTION PHASE, THE TURF, TOPSOIL AND UNDER TOPSOIL AND PIN TYPE 1 FIELD INLET
PROTECTIVE GEOFABRIC IS TO BE REMOVED AND THE BASIN RE-PLANTED WITH VEGETATION AND LANDSCAPING AS PER THE TO EMBANKMENT SURFACE LEVEL,
INVERT LEVEL, AND
50mm MIN.
LANDSCAPE DESIGN DRAWINGS. WORKS UNDERTAKEN FOR OPERATIONAL ESTABLISHMENT ARE TO BE UNDERTAKEN BY OTHERS SUBSOIL DRAIN CLEANOUT - PVC 0.50m
COVER
AND WILL BE SUBJECT TO A SEPARATE ACCEPTANCE BY COUNCIL FOR ON AND OFF MAINTENANCE. MIN. SIZE AS SPECIFIED.
PIPE (NON SLOTTED) AND CONNECTOR
4. IN-SITU INFILTRATION TEST - AN IN-SITU INFILTRATION TEST WILL BE REQUIRED PRIOR TO ON-MAINTENNACE BEING GRANTED BY CLEANOUTS AT HEAD OF SUBSOIL
COUNCIL. THE TEST WILL NEED TO ACHIEVE AN AVERAGE RATE OF 120mm/h INFILTRATION (WITHIN APPROPRIATE TOLERANCES) WITH
50mm
DRAIN AS SHOWN ON PLAN
MIN
AT LEAST 3 SAMPLE LOCATIONS AROUND THE BASIN. ANOTHER IN-SITU INFILTRATION TEST WILL BE REQUIRED FOR
OFF-MAINTENANCE. GRAVEL DRAINAGE LAYER
- DEPTH VARIES (200mm MIN)
TO SUIT GRADE OF SUBSOIL PIPES.
PROVIDE BIDUM A12 OR
BIO RETENTION PARTICLE SIZE DISTRIBUTION AND PROPERTIES GUIDE: 5-7mm AGGREGATE NO FINES
HDPE LINER - REFER NOTE
SOURCE: (BIOFILTRATION MEDIA GUIDELINES (VERSION 3.01), PREPARED BY THE FACILITY FOR ADVANCING WATER BIOFILTRATION OUTLET PIPE -
UPVC JOINT TO 150Ø SMOOTH WALLED SLOTTED 225Ø UNSLOTTED PVC
(FAWB), JUNE 2009.) & (BIO-RETENTION TECHNICAL DESIGN GUIDELINES (VERSION 1) PREPARED BY 'WATER BY DESIGN' (OCTOBER 2012) SIZE AS SPECIFIED
CONNECTION RISER PVC PIPE - MIN 0.5% GRADE COLLECTOR PIPE - MIN 0.5% GRADE
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.
· pH - AS SPECIFIED FOR 'NATURAL SOILS AND SOIL BLENDS' 5.5-7.5 (pH 1:5 IN WATER) RL 99.40m AHD
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
1 30.01.17 ORIGINAL ISSUE NA BF FOR APPROVAL PALM LAKE WORKS PTY LTD PALM LAKE RESORT STORMWATER QUALITY
2 NOT FOR CONSTRUCTION STAGE 4 & 5
3 1:20 0.2 0 0.2 0.4 0.6 0.8 1 A1
NOTES & DETAILS
4 DESIGN APPROVED 1:40 A3 19 TRADING POST ROAD - COOROY
5 ANDREW McPHAIL RPEQ 6921 PROJECT No. DRAWING No. REVISION
6 DISCLAIMER
7
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 A
8 FOR & ON BEHALF OF CALIBRE CONSULTING (QLD) PTY LTD
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