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Effluent Disposal Report - RFI - RAL26-0015 · RAL26/0015
M & K Bennett Pty Ltd
As Trustee for The Bennett Family Trust
Trading as Onsite Wastewater Design
ABN : 15204820396 ACN : 615325794
QBCC Lic : 15034580
E : [email protected]
W : www.wastewaterdesign.com.au
M : 0493 615 672
Effluent Disposal Report
Client: J. Franz
Address: Proposed Lot 7, 434 Lake Cooroibah Road,
Cooroibah
Job #: 24/377
RPD: 78SP116879
Council: Noosa Shire Council
Proposed Development: Proposed New Lot
Report Date: 14/07/26
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Page 2
Introduction
The purpose of this report is to evaluate and design a suitable on-site treatment system
and disposal area in accordance with AS 1547 – 2012, the Queensland Plumbing and
Wastewater Code, The Environmental Protection Act, The Plumbing and Drainage Act and
Local Council requirements. The report relates exclusively to the above site and the
proposed and or existing buildings shown on the plan only. All measurements and levels
shown are as accurate as possible with the information provided these are to be used for
locating the onsite effluent disposal system only.
Site Description
Weather Conditions Fine
Slope 2%
Slope Stability N/a
Vegetation Grassed, scattered mature trees
Watercourses Dams
Site exposure Sun & wind
Salinity Nil
Surface condition Nil cracks, seepage, or compaction
Boulders & Rock outcrops Nil
Will water from uphill traverse the area May
Water table Present 400mm
Soil Category (AS1547-2012 Table M1)
Boreholes 0-600mm
BH 1, BH2 Cat 4
Silty Sand, Grey
Perc Result: 0.25 Clay Loams
Weakly Structured
0.12-0.5m/d
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Page 3
Design Calculations
(The Disposal area is solely based upon the below calculation; no additional loads are to
be connected. Additional bedrooms, buildings or residents could result in failure)
Number of Buildings 1
Number of Bedrooms 4
Number of Persons (Max) 6
Adopted DIR 3
(Lower rate used due to high water table)
Litres per person per day (Tank supply) 120
Calculations 6x120 = 720/3=240
Minimum Disposal Area Required 240sqm (min)
Available Reserve area 100%
Type of Treatment
The site is to be provided with an approved (By Department of Housing and Public Works)
Advanced Secondary ASTP. The installer is to ensure the proposed final local of the
system provides sufficient fall and does not cause audible disturbance to nearby
residence.
Disposal Area & Treatment Requirements
The disposal area required is 240sqm (min).
The irrigation area is to be Covered Surface Drip Irrigation and consist of pressure
compensating dripper lines laid atop of the existing ground surface spaced
approximately 800mm apart and covered with 150mm of mulch.
The area is to be planted out with water tolerant shrubs.
The installer is to ensure the HSTP is located at least 150mm above any flood levels.
The installer is to ensure the HSTP location does not cause damage to existing or
proposed footing systems, the HSTP should be anchored to prevent flotation.
All materials used are to be approved, fit for use and new. All pipework must be rated to
150% of the pump shut off.
The HSTP is to be fitted with a discharge filter with a suitable aperture, to prevent blocking
of the irrigation type installed. This should be accessible and cleaned regularly.
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Page 4
All stormwater from upslope is to be diverted area from the area. A shallow spoon drain is to be constructed uphill of the irrigation area if deemed necessary to divert water around the area. A 150mm high retention mound is to be installed downhill to capture any runoff if deemed necessary. The installer is to ensure the pump within the HSTP is sufficient to operate and pressure the proposed irrigation system but does not over pressurize and cause the sprinklers to aerosol. The pipework from the HSTP shall be 25-32mm dia. purple line poly, buried within a 200mm thick sand bed to prevent damage if deemed necessary. Control valves may be necessary to control flow and prevent misting. Spray plumes are to be a maximum of 2m in dia. & 0.5m High. The installer should install non return valves if needed. The area should be constructed so there is no pooling or run off. Two warning signs stating “Recycled Water, Avoid Contact, Do Not Drink” are to be installed around the disposal area. All work is to be carried out by suitably licensed person. If soil or site conditions are found to be different from the investigation or failure is observed, contact us immediately. Performance Solution (Turf Valves) The design has considered site and soil conditions and has also been discussed with the landowner. The irrigation area has been designed using correct DIR and hose design as per local Council requirements. The spray from the sprinklers shall not exceed 500mm in height, 2000mm in dia. and be heavy droplet in nature that prevents misting and drift. All pipework and materials used are to be new, meet relevant standards and be fit for use. The irrigation area must be provided with a treatment plant manufacturer approved method of isolation to allow the homeowner to move the sprinklers on a regular basis. This isolation must not harm the treatment plant and not allow the sprinklers to come during the moving of said sprinklers. (Sprinklers should be moved a minimum of every 3-4 days however this will depend on usage and soil type) Category 4 soils or better will assist in even distribution of treated effluent however regular movement of sprinklers is needed to avoid runoff, ponding, or failure. 4 of 6
Page 5
Maintenance and Operation of System (Owners responsibilities)
• Scrape all dishes to remove fats, grease, etc. before washing.
• Don't use a garbage grinder.
• Use biodegradable soaps.
• Use a low phosphorus detergent.
• Don't use powerful bleaches.
• Don't put sanitary napkins and other hygiene products into the system.
• Spray or irrigation areas should have access restricted.
• Divert surface water away from land application area.
• No vehicles or stock should be allowed on trenches, beds or irrigation areas.
• Deep rooting trees or shrubs should not be grown over absorption trenches or
pipes.
• Where purple movable hoses (turf Valves) have been installed it is the owners
responsibility to move. (Generally, every 2-3 days)
• If the designed area is grassed, it must be mowed and maintained regularly to
encourage evaporation.
• Effluent is not to be disposed of outside the designed area.
• Vegetable gardens and/or fruit trees should not be planted within or near areas,
where there is a possibility of airborne spray coming into contact with the plant.
• Structures should not be constructed near disposal areas that encourage people to
congregate.
• Play areas and equipment should be well away from areas where there is no
possibility of spray coming into contact with humans.
• Treatment plants and septic tanks are to be desludged every 3-5 years.
• We will not be liable for any Council Inspection, submission or reviewing fees due to
changes in report or plan requested by client or Council.
• If any part of this design is unclear, please call before buying products or installing.
• This report must be approved by the local authority and appropriate permits issued
before any work can be undertaken.
• The owner is to install water saving fixtures where possible.
• Large loads such as clothes washing should be spread out over the week.
• The installer is to contact Local Authorities prior to burying the system for a site
inspection and certification. If we are required to inspect, additional fees will
apply.
• Follow the manufacturer's instructions, relevant codes, standards and guidelines for
installation, servicing, maintaining, and cleaning the system and irrigation
area/trenches/beds.
Site Setbacks
Set back distances as per local council policies and AS1547 -2012 are to be met some of
these setbacks when Advanced Secondary with Surface Irrigation is used are;
10M from a watercourse, dam, table drain, bore etc.
10M from a dwelling or habitable building.
2M from a boundary/driveway if it slopes away or is level with that boundary/driveway.
4M from boundary/driveway if it slopes towards that boundary/driveway
6M from an inground water tank
6M from pool edge.
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Page 6
Proposed Disposal Area Authorized Signatory WM Excnnet? Matt Bennett 6 of 6
Page 7
Notes
Levels shown are
approximate and are
sourced from local council
mapping or information 800mm
provided by the client.
150mm Mulch
These levels are solely to
demonstrate the
functionality of the system.
Covered Surface Irrigation Diagram
Actual floor height is to be
confirmed with the builder
prior to installation.
All pipe work from the
structure to the proposed
system should be covered
and adequately vented and
be vermin/insect proof.
All work carried out should
meet relevant
codes/standards and be
done by an appropriately
qualified and licensed
person.
Proposed system should be Dripper
constructed in a way to
maximize
Lines
evapotranspiration and
minimize potential pooling
and runoff.
25-32mm Purple Line Poly
If plans were not available
at the time of investigation
further reporting and
design work may be
needed prior to council
submission and installation.
Care is to be taken not to
sompact,smear or damage
the soil structure during
installation (This can lead
to premature failure).
If structures have been
built since our initial
investigation (Including
neighboring structures)
please contact us to
confirm this will not
adversely effect the design.
Final landscaping and
installation should
discourage and limit causal
pedestrian access.(By way
of plantings, border,
mounds, visual and or
physical deterrents)
The owner should obtain
knowledge on how to use
and maintain the proposed
system. Most of this is
available from your chosen
supplier/installer.
This report must be
approved by the local
council prior to any work
commencing.
M & K Bennett Pty Ltd ATF The Bennett
Abbreviations Family Trust T/A
BH : Borehole DCP : Dynamic Cone Penetrometer Onsite Wastewater Design
PT : Percolation Test HD : Heavy Droplet Lilac Sprinkler Gympie, QLD.
TV : Turf Valve RWT : Rain Water Tank QBCC # 150 345 80
E: [email protected]
W: www.wastewaterdesign.com.au
P: 0493615672
Page 8
Notes
Levels shown are
approximate and are
sourced from local council
mapping or information
N
provided by the client.
These levels are solely to
demonstrate the Proposed Advanced
functionality of the system. Secondary ASTP
Actual floor height is to be
confirmed with the builder Possible
prior to installation. Residence
All pipe work from the
structure to the proposed Proposed Covered Surface
system should be covered Irrigation Area - 240sqm
and adequately vented and (20 x 12m)
be vermin/insect proof.
All work carried out should
meet relevant
codes/standards and be
BH1 BH2
done by an appropriately
qualified and licensed x.
person. Appro 30
30m m
Proposed system should be Min. 10 App
1 0m m r
constructed in a way to Slope 2% Mi ox.
n.
maximize
Reserve Area
evapotranspiration and Dam
minimize potential pooling
and runoff.
If plans were not available
at the time of investigation
further reporting and
design work may be
needed prior to council
submission and installation.
Care is to be taken not to
sompact,smear or damage
the soil structure during
installation (This can lead
to premature failure).
If structures have been
built since our initial
investigation (Including
neighboring structures)
please contact us to
confirm this will not
adversely effect the design.
Final landscaping and
installation should
discourage and limit causal
pedestrian access.(By way
of plantings, border,
mounds, visual and or
physical deterrents)
The owner should obtain
knowledge on how to use
and maintain the proposed
system. Most of this is
available from your chosen
supplier/installer.
This report must be
approved by the local
council prior to any work
commencing.
M & K Bennett Pty Ltd ATF The Bennett
Client- J. Franz Abbreviations Family Trust T/A
Site - Proposed Lot 7, 434 Lake Cooroibah BH : Borehole DCP : Dynamic Cone Penetrometer Onsite Wastewater Design
Date - 14/07/26 PT : Percolation Test HD : Heavy Droplet Lilac Sprinkler Gympie, QLD.
Job# - 24/377 TV : Turf Valve RWT : Rain Water Tank QBCC # 150 345 80
Scale - 1 : 900 @ A4 (Site features are approximate-Do not scale) E: [email protected]
W: www.wastewaterdesign.com.au
P: 0493615672
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