Engineering Drawings Part 2 - OPW14/0197

 

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Cl. CAP. EXTEND CAP TO

APPROX. 100mm ABOVE
BIO-RETENTION SURFACE.

SCREW CAP FIXED USING 3 SCREWS

EXTEND LINER 300mm UNDER

FILTER MEDIA - DEPTH 600mm SANDY
LOAM CONSISTENT WITH CURRENT
FAWB SPECIFICATIONS

TRANSITION LAYER - DEPTH 100mm
COARSE SAND - NOMINAL PARTICLE SIZE 1mm

150mm x 150mm CONCRETE
SURROUND TO CLEANOUT RISER

[
STORMWATER QUALITY W.S.L 0

 

LINER TO EXTEND
AND BE FIXED TO

 

 

0.30m

 

TOPSOIL AND PIN TO EMBANKMENT ——*—~

SUBSOIL DRAIN CLEANOUT - PVC PIPE (NON
SLOTTED) AND CONNECTOR CLEANOUTS AT
HEAD OF SUBSOIL DRAIN AS SHOWN ON PLAN

   

 

 

 

GRAVEL DRAINAGE LAYER - DEPTH

 

VARIES (200mm MIN) TO SUIT GRADE OF
SUBSOIL PIPES. 2-4mm AGGREGATE NO FINES

UPVC JOINT TO
CONNECTION RISER
TO SLOTTED PIPE

  

 

 

 

 

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300mm INTO MEDIA
PERIMETER OF PIT

kK

[" TYPE 1 FIELD INLET
pe

SURFACE LEVEL, INVERT LEVEL,
AND SIZE AS SPECIFIED.

 

50mm

 

PROVIDE BIDUM A12 OR
HDPE LINER - REFER NOTE

 

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150% SMOOTH WALLED SLOTTED
PVC PIPE - MIN 0.5% GRADE
AND MAX 2.5m SPACINGS

TYPICAL BIO RETENTION BASIN SUBSOIL DRAIN
CLEAN OUT AND FILTER MEDIA SPECIFICATIONS

ROCK ARMOURING NOTES:

1. ROCKS TO BE DURABLE BLUE STONE OR OTHERWISE
APPROVED BY SUPERINTENDENT.

2. EACH ROCK SHALL BE

- 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 RATHER THAN FLAT).

4, ROCKS TO BE PLACED AND INTERLOCKED INTO
POSITION AND BUILT UP TO FINAL LEVELS SHOWN,
ENSURING COVERAGE OF 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 Dso 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 Dso. FOR EXAMPLE
IF Dso = 400mm IS SPECIFIED, THE EQUIVALENT ROCK
DIAMETER RANGES FROM 280 to 520mm.

 

NOTE:

APPROPRIATENESS OF GEOTEXTILE LINER AS
AN ALTERNATIVE TO HDPE LINER TO BE
ASSESSED BY GEOTECHNICAL ENGINEER AT
CONSTRUCTION STAGE FOLLOWING TESTING OF
INSITU SOILS.

 

 

 

 

NOTES:

1, REFER DRAWING N13078-128 TO N13078-130
FOR BASIN SECTIONS AND DETAILS.

2. REFER DRAWING N13078-107 TO N13078-109
FOR EARTHWORKS NOTES AND DETAILS.

 

 

 

f NBOI8-(BLdug ATE: 12-02-2004 TIME: 1439

Xref’s: X-NIB078-TIT USR: leigh fry

SCALE 1:20 (A1)

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.

COMPACTION: THE FILTER MEDIA MUST BE LIGHTLY
COMPACTED DURING INSTALLATION TO PREVENT THE
MIGRATION OF FINE PARTICLES. THIS 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’ BOBCATS CAN BE USED FOR LARGE SYSTEMS.
ENSURE ONLY ONE COMPACTING PASS IS MADE OVER THE
MEDIA FOR LIGHT COMPACTION.

we UNSLOTTED PVC

COLLECTOR PIPE - MIN 0.5% GRADE

 

PROVIDE 300mm
THICK CONCRETE

\ omer PIPE -

SIZE AS SPECIFIED

INFILL

 

1.0m WIDE, 0.45m DEEP, 0.20m
THICK CONCRETE (SL81 MESH
CENTRAL) SUPPORT UNDER PIPE

TYPICAL OUTLET THROUGH ROCKWALL DETAIL

 

SCALE 1:50 (A1)

BIO RETENTION BASIN CONSTRUCTION SEQUENCE NOTES:

it CONSTRUCTION AND ESTABLISHMENT OF BIO RETENTION BASINS IS TO BE STAGED AS FOLLOWS:
FUNCTIONAL INSTALLATION - ONCE THE MAJORITY OF THE SUBDIVISION WORKS ARE COMPLETE, THE
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.
ACCEPTANCE OF THE COMPLETED SUBDIVISION WORKS ON AND OFF MAINTENANCE BY COUNCIL IS TO
EXCLUDE THE PROTECTIVE LAYERS WITHIN THE BIO BASINS.

2, BUILDING CONSTRUCTION - THE PROTECTIVE GEOFABRIC AND GRASS LAYER AND THE EROSION AND
SEDIMENT CONTROL MEASURES ARE TO REMAIN IN PLACE DURING THE BUILDING CONSTRUCTION PHASE.
THE BUILDING CONSTRUCTION PHASE IS TO BE THE TIME FOR COMPLETION OF 12 MONTHS FOLLOWING
COMPLETION OF THE SUBDIVISION WORKS OR AS CONDITIONED BY THE LOCAL COUNCIL, WHICHEVER IS
SHORTER. THE MAINTENANCE OF THE BASINS INCLUDING INLETS, OUTLETS AND EROSION AND SEDIMENT
CONTROL MEASURES IS TO BE UNDERTAKEN BY THE CIVIL CONTRACTOR FOR THE DURATION OF THE
BUILDING CONSTRUCTION PHASE.

3. OPERATIONAL ESTABLISHMENT - FOLLOWING COMPLETION OF THE BUILDING CONSTRUCTION PHASE, THE
TURF, TOPSOIL AND PROTECTIVE GEOFABRIC IS TO BE REMOVED AND THE BASIN RE-PLANTED WITH
VEGETATION AND LANDSCAPING AS PER THE LANDSCAPE DESIGN DRAWINGS. WORKS UNDERTAKEN FOR
OPERATIONAL ESTABLISHMENT ARE TO BE UNDERTAKEN BY OTHERS AND WILL BE SUBJECT TO A
SEPARATE ACCEPTANCE BY COUNCIL FOR ON AND OFF MAINTENANCE.

4, IN-SITU INFILTRATION TEST - AN IN-SITU INFILTRATION TEST WILL BE REQUIRED PRIOR TO
ON-MAINTENANCE BEING GRANTED BY COUNCIL. THE TEST WILL NEED TO ACHIEVE AN AVERAGE RATE
OF 180mm/h INFILTRATION (WITHIN APPROPRIATE TOLERANCES) WITH AT LEAST & SAMPLE LOCATIONS
AROUND THE BASIN. ANOTHER IN-SITU INFILTRATION TEST WILL BE REQUIRED FOR OFF-MAINTENANCE.

BIO RETENTION PARTICLE SIZE DISTRIBUTION AND PROPERTIES GUIDE:
SOURCE: (BIOFILTRATION MEDIA GUIDELINES (VERSION 3.01), PREPARED BY THE FACILITY FOR ADVANCING
WATER BIOFILTRATION (FAWB), JUNE 2009.) & (BIO-RETENTION TECHNICAL DESIGN GUIDELINES (VERSION 1)
PREPARED BY ‘WATER BY DESIGN’ (OCTOBER 2012)

MATERIAL COMPOSITION RANGE GUIDE:

CLAY AND SILT <3% (<0.05mm)
VERY FINE SAND 5-30% (0.05-0.15mm)
FINE SAND 10-30% (0.15-0.25mm)
MEDIUM TO COARSE SAND 40-60% (0.25-1.0mm)
COARSE SAND 71-00% (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.

SOIL_SPECIFICATIONS:

© TOTAL NITROGEN CONTENT - <1000mg/kg

© ORTHOPHOSPHATE CONTENT - <80mg/kg SOILS WITH TOTAL PHOSPHORUS CONCENTRATIONS >100mg/kg
SHOULD BE TESTED FOR POTENTIAL LEACHING. WHERE PLANTS WITH MODERATE PHOSPHORUS
SENSITIVITY ARE TO BE USED, TOTAL PHOSPHORUS CONCENTRATIONS SHOULD BE <20mg/kg)

© ORGANIC MATTER CONTENT - AT LEAST 3% (w/w). AN ORGANIC CONTENT LOWER THAN 3% IS
LIKELY TO HAVE TOO LOW A WATER 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)

© ELECTRICAL CONDUCTIVITY - AS SPECIFIED FOR ‘NATURAL SOILS AND SOIL BLENDS’ <1.2 dS/m.

 

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AMENDMENT DETAILS.

 

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DESIGN CHECK

 

 

 

 

 

 

 

 

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DRAWN CHECK|

 

"SCALE (METRES 7 MIGROFIUM No,

AS SHOWN

PROJECT No.

N13078

 

SURVEYOR: RPS
1 INNOVATION PARKWAY,

"APPROVED.

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Ph (07) 5436 7888 Fax (07) 5493 6630

FOR & ON BEHALF QF BROWN CONSULTING (QLD) PTY LTD

CLIENT

BIRTINYA QM PROPERTIES

 

PROJECT

LAKE DOONELLA NOOSA
STAGE C1 - C6

SHAUN PILCHER RPE. 14593}
MATHEW HILL RPEQ 11578
BRENT THOMAS RPEQ 7862

 

 

 

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Ble OSD Fink OSD N13078-131