Council archive · source document
Appendix C - Effluent Disposal Report · MCU26/0099
....
Site and Soil Evaluation . . . . .
Client: R. Wilks
Location
267 Louis Bazzo Drive
Pomona, QLD
(Lot 8 on RP854337)
Report No: 260176 (A)Rev-A
Date: 14/09/2026
Phone: 0428 310 453
Email: [email protected]
Address: 174 Railway Road, Cooran Qld 4569
Australian Soil Investigations Pty Ltd
ABN: 11147854439
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Page 2
ON-SITE EFFLUENT DISPOSAL REPORT:
Introduction:
Australian Soil Investigations have conducted a Site and Soil Assessment at the above allotment for the purpose
of determining the most suitable means of on-site effluent disposal. On-site testing for this assessment was
performed in accordance with AS 1547-2012-“On-Site Domestic Wastewater Management and the Queensland
Plumbing and Wastewater Code. Field work for this assessment was undertaken, on the 16/04/2025.
ASI has been asked to provide a design for a two bedroom dwelling.
Site description:
The allotment is located within the Noosa Regional Council and is contained within a rural residential area.
The slope within the allotment is generally linear. The slope within the area best suited for effluent disposal is in
the order of 4%.
On-Site Assessment:
During our site evaluation consideration was given to the following:
the available area for the primary siting of absorption areas (Land Application Area) and alternative
sightings.
the risk of prejudicing adjoining property and underground water supplies, by seepage or run off from
the site.
permeability, soil type and soil depth.
drainage, and envisaged seasonal changes in ground water level.
general climate.
slope and the effects of seepage and water run-off from surrounding higher ground.
On-Site Testing:
Three test holes were excavated in the positions shown in the attached site sketch. These holes were 100mm
diameter x 600 mm deep for the purpose of site soil assessment in accordance with the AS 1547-2012. A
further 100mm diameter hole was excavated to determine the soil profile. The site was then classified in
accordance with AS 1547–2012 On-Site Wastewater Management for the purposes of effluent disposal.
Results:
Site Observations
Yes No
Suitable Area for siting a Land Application Area
Setback requirements to waterways
Adequate area for a Reserve area
Is there Adequate Soil Depth above rock or the water table
Is the Soil Type Satisfactory
Is the potential of runoff from the proposed area OK
Is there a potential for groundwater seepage
AUSTRALIAN SOIL INVESTIGATIONS Page 2 of 6 ASI Ref: 260176 (A)Rev-A
Page 3
Soil Borehole Results
Depth Soil Description
0-300 Silty Clay
Light to med clay, dark brown, moist
Moderate structure. (Cat 4)
300-1200 Silty Clay CH
Med to heavy clay, red mottled grey, moist
Moderate structure. (Cat 5)
1200-2000 Silty Clay CH
med to heavy clay, pale grey mottled red, moist
Moderate structure. (Cat 5)
2000 Borehole Terminated
Constant Head Method permeability results
The following design criteria is applicable for the following disposal methods:
Test Site:
1 2 3
Fall (mm) 25 25 25
Time (mins) 51 45 43
(secs) 7 28 39
Indicative Permeability (Ksat) 0.0783 0.0880 0.0916
Soil Category 5 5 5
Indicative Permeability
Test Site: 1 2 3
Soil Category 5 5 5
Structure Moderate Moderate Moderate
Indicative Permeability 0.06-0.12 0.06-0.12 0.06-0.12
DLR 5 5 5
Recommendations:
Based upon our Site and Soil Assessments we recommend the following method of On-Site Effluent Disposal
should be used.
Disposal System Recommendations:
Based on our site assessment and testing we recommend that the most appropriate disposal method to be:
Advanced Secondary Treatment
With an AES Transpiration Bed
For the disposal of the treated effluent within the Land Application Area we recommend;
An Advanced Enviro Septic System (AES)
AUSTRALIAN SOIL INVESTIGATIONS Page 3 of 6 ASI Ref: 260176 (A)Rev-A
Page 4
REFER TO AES CALCULATOR FOR AES BED SIZING.
Recommendations and construction guidelines for AES beds:
Ensure all manufacturers installation guidelines and requirements are strictly adhered to.(Copy of installation
requirements included in appendix).
Installers must use specified filter material.
Avoid excavation when the soil is damp;
Where smearing has occurred, rake the smeared soil to reinstate a more natural soil surface,
taking care to use fine tines and effect surface penetration only;
Plan excavation work only when the weather is fine, if rain is forecast then cover trenches, if open,
protect them from rain damage;
In permanently wet areas or when construction cannot be delayed until fine weather conditions are
achieved, smearing of soil surfaces may be alleviated via the use of gypsum (an application of
1kg/m2 may be utilised);
Avoid compaction by not having people stand on the finished trench or bed floor, and when
excavating by machine, having the bucket fitted with ‘raker teeth’ and excavate in small ‘bites’ to
minimise compaction;
When sited on sloping ground, beds should be excavated perpendicular to the line of fall or surface
contours;
Trench and bed inverts should be level;
Diversion drain to be excavated above slope of land application area.
Septic Tanks:
The septic tank size shall be in accordance with the local authorities requirements. The tank must be de-
sludged at regular intervals to ensure its performance is maintained.
Backfilling:
The filter media should be placed in the trench by excavator or bucket or a shoot, and not dumped in.
Dumping is likely to cause soil damage to both the trench base and the side walls. Such damage is also likely
when backfilling is placed over in-situ filter media during or after period of heavy rainfall. The filter media for
AES system should be clean washed material suitable to manufacturers specifications. Note: ASTM Standard C-
33(Concrete sand) meets requirements. Trenches and beds will be covered with soil which should not be more
permeable than the surrounding natural soil. A protective barrier should be laid over the filter media to prevent
ingress by cover material.
Where the trench is being covered by cast in-situ concrete or other paving, plastic film or a suitable synthetic
fabric should cover the trenches to prevent concrete infiltration or ingress or bedding fines.
Preparation of irrigation area:
When a proposed irrigation area has a low permeability, it is particularly important to ensure that the
permeability of the soil in the irrigation area is improved and maintained and that there is an adequate cover of
porous and fertile topsoil to act as immediate storage of effluent applied to it, and to support rapid growth of
vegetation on the area to maximise evapo-transpiration.
It is recommended that topsoil be imported to improve rapid growth of vegetation and improve the evapo-
transpiration process.
AUSTRALIAN SOIL INVESTIGATIONS Page 4 of 6 ASI Ref: 260176 (A)Rev-A
Page 5
Requirements of irrigation system:
All irrigation pipe work and fittings shall comply with all parts of AS 1477 or AS 2698.2. The distribution
irrigation lines should be buried to a minimum depth of 100mm. There shall be no cross connection between
any irrigation pipe work and the potable water supply. Any pipe work used for the transport of effluent included
treated effluent must be lilac in colour
Along the boundary of the surface irrigation area there shall be at least two warning signs clearly visible to
inform the occupants of the premises that recycled water is used for irrigation. Each sign shall comply with AS
1319 and have:
(a) lettering visible at 3m and
(b) wording: Recycled Water
Avoid Contact
DO NOT DRINK
Prior to the use of the system, the warning signs and the landscaping and surface preparation must be
completed. The Land Application Area must also be inspected and approved for use by Australian Soil
Investigations.
Siting of the Land Application Area:
The current Code of Practice for On-site Sewerage Facilities provides minimum horizontal/vertical separation
distances for Land Application Areas. They are as follows;
Property Boundaries Upslope from the Area - 2.0m
Property Boundaries Downslope from the Area - 4.0m
Dwellings or buildings - 4.0m
In ground swimming Pools - 6.0m
In-ground potable Water Tanks - 15.0m
Dams, Watercourses or Bores - 10.0m
Vertical distance to water table - 1.2m
In no instance shall Effluent be used for irrigation of fruit or vegetables.
No Vehicle loading or children’s recreational areas to be applied or constructed within the Land
Application Area.
System Maintenance:
The owner of the property shall ensure that all manufacturers maintenance procedures are undertaken in
accordance with the local authority and the manufacturers recommendations for what ever system is installed.
The owners guide for AES systems should be downloaded from www.actiontanks.com.au. All guidelines and
recommendations are to be adhered to.
System Installation:
Installation of the system must be undertaken by a qualified plumber in accordance with local authority
requirements and in accordance with the relevant Australian Standards and Australian Building Code. If
installing an AES system installer must have completed AES accreditation. Installation to be in accordance with
AES installation instructions.
NOTE: The system is not to be installed or utilized without Plumbing approval from Council.
The building is not to be occupied without Building and Plumbing approval. Permit Numbers are
to be provided to the installer and designer.
AUSTRALIAN SOIL INVESTIGATIONS Page 5 of 6 ASI Ref: 260176 (A)Rev-A
Page 6
Definitions: Design Loading Rate (DLR) The long term acceptance rate (LTAR), reduced by a factor of safety, expressed in L/m 2/day or mm/day as applied to the horizontal design area of a land application system. Durable Aggregate An aggregate with the grading requirements specified in AS 2758.1 for single-size course aggregate for nominal sizes from 20mm - 40mm. Geotextile Any permeable durable synthetic textile material used with foundations, soil, rock, earth or other geotechnical engineering related material. Land Application Area The designated area of land and reticulation system used for the disposal of the treated effluent. LTAR The long term average rate an effluent can be adsorbed into the soil of a disposal system, expressed in litres per square meter per day. LTAR is dependant on effluent quality, permeability and organic loading. Permeability The rate clean water is transmitted through a soil, expressed in meters per day. Water Reduction Fixtures Fixtures include 11/5.5 litre water closets, shower flow restrictors, aerator taps and water conserving washing machines. Report Limitations: The log sections in this report should be representative of the soil conditions over this site, however, soil conditions can change dramatically over short distances. The person responsible for installing the system must observe the soil profile and ensure it matches the soil profiles recorded in this report. If soil conditions differ from those recorded by us, we must be immediately notified so that further investigation can be carried out and the system design modified if necessary. This work may involve additional fees and costs. This company will not accept any responsibility for additional costs to any party as a result of soil variations. In writing this report, we have also considered all the information supplied to us by our client. Should the client or his agent have omitted to supply us with relevant information, our report may be irrelevant and/or inappropriate. We do not take responsibility for the consequences in such cases and we will make an additional charge if as a result, more testing or rewriting of this report is necessary. The operation of the disposal system is dependant upon the hydraulic load, the type of the material entering the system and the maintenance of the system. As these factors are beyond the control of this company we do not take any responsibility for the long term adequacy of any disposal system constructed on this site or the consequences of its malfunction. W. Holmes – QBCC - 1120066 For and on behalf of: AUSTRALIAN SOIL INVESTIGATIONS – QBCC - 15072110 AUSTRALIAN SOIL INVESTIGATIONS Page 6 of 6 ASI Ref: 260176 (A)Rev-A
Page 7
Advanced Enviro-Septic Design Calculator V11.0 MULTI-BED©
MINIMUM DAILY FLOW 1,200 Lpd
AES The World Leader in Passive Solutions ©
Site Address 267 Louis Bazzo Drive, Pomona State QLD Post Code 4568
Client Name R. Wilks Date of Site Visit 16/4/2026
Designers Designers Ph Designer Lic
W R Holmes Australian Soil Investigations 0428 310 453 1120066
Name Number (e.gQBCC)
Plumber Ph Plumb / Drainer
Lic Plumber TBA TBA TBA
Number Lic Number
Designers AES
Council Area Noosa 25 Date 14/9/2026
Cert Number
Calculator is a guide only, receiving soil classification, surface water, water tables and all other site constraints addressed by qualified designer
System Designers site and soil calculation data entry IMPORTANT NOTES
Enter AES L/m pipe loading rate "38" Secondary 38 >> This design is for SECONDARY
Is this a new installation Y or N Y >> Minimun single vent size is 80mm or 2x50mm house vents
Number of AES BEDS 1 >> Input the number of AES Beds 1 to 4
Number of Bedrooms 3 >> Not used in ANY Calculation. If not known 0 or leave blank.
Number of persons 5 >> Septic outlet filter NOT RECOMMENDED GRAVITY Systems
Daily Design FLOW Allowance Litre/Person/Day 120
Minimum AES Pipe Daily Flow (GOVERNMENT REGULATED) L/Day 1200 >> Government Requirement
Number of AES Pipe ROWS required per BED 4 >> Longer AES runs are better than multiplule short runs.
Infiltration Soil Category from site/soil evaluation per AS/NZS1547 5 >> Catagory may require design considerations. Refer AS1547
Design Loading Rate based on site & soil evaluation DLR (mm/day) 8 >> Soil conditioning may be necessary. Refer AS1547
Soil Bore log depth 2.0m >> Check water table, restrictive layers, etc
Is this design a GRAVITY system with no outlet filter? Y or N Y >> GRAVITY. House Vent & LOW VENT on AES bed is required
PLEASE CHECK YOU HAVE FALL FROM TANK TO AES SYSTEM PIPES 75
COMMENTS :- " The outcome must be important to everyone. "
- Ripping receiving surface is required in clay soil structures Cat 4,5,6. Refer to AS 1547. Always excavate & rip parallel to the site slope/AES pipe.
- Specialist soils advice & design techniques will be required for clay dominated soil having dispersive or shrink/swell behaviour. Refer AS1547
- Designers need to be familar with special requirements of Local Authorities (Minimum falls from Septic tank outlets to Land application areas etc
- Good construction techniques as per AS1547 are especially important in these soil types. Refer AS1547 & AES installation Instructions
1200
AES System Calculator Outcomes AES dimensions For ONE Bed
AES System System Extension
Total System load - litres / day (Q). 600 l/d
Length:(L) 9.60m 9.60m
7.89 Min Length of AES pipe rows to treat loading 7.89 lm
Width:(W) 2.25m 5.56m
Number of FULL AES Pipe lengths per row 3 lths
Sand Depth
Total Capacity of AES System pipe in Litres 2544 ltr. 0.75m 0.15m
:
AES Additional infiltration extension required 53.4 m2 Area m2 21.6 m^2 53.4 m^2
USE CUT LENGTHS OF PIPE IN THIS DESIGN? (ENTER Y)
IF YOU WISH TO USE A TRENCH EXTENSION DESIGN OPTION ENTER "Y" Enter Custom Width in metre
AES INFILTRATION FOOT PRINT AREA - L = Q / ( DLR x W) Length Width Minimum AES foot print required
AES Bed 1 9.60m x 7.81m = 75.0 m2 per AES Bed
OVERALL AES TOTAL FOOTPRINT 9.60m x 7.81m = 75.0 m2 TOTAL
AES pipes are best centered in the trench parallel to the site slope
Code AES System Bill of Materials. Chankar Environmental Use Only
AES-PIPE AES 3 metre Lengths required 12 lths
AESC AES Couplings required 8 ea
AESO AES Offset adaptors 8 ea
AESODV AES Oxygen demand vent 1 ea
“Nature's Wastewater Solutions”
AESODV AES Oxygen demand vent EXTRA MULTI BEDS 1 ea
AES-IPB AES 100mm Inspection point base 2 ea
TD Kit 4 4 Hole Distribution Box Kit 1 ea
Digitally signed by Kane Dickson
TD Kit 7 7 Hole Distribution Box Kit ea DN: cn=Kane Dickson, o=Chankar
VS43-4 Sweet Air Filter VS43-4 ea Environmental Pty Ltd ,
ou=Advanced Enviro-Septic ,
AES DESO Double Offset Adaptors ea
email=designreview@enviro-
TOTAL SYSTEM SAND REQUIRED (Estimate Only) 29 m3 septic.com.au, c=AU
Date: 2026.09.14 13:38:14 +10'00'
Please email your AES Calculator (EXCEL FORMAT), Site Layout & AES Design to
[email protected] [email protected]
> The AES Calculator is a design guide ONLY to allow checking of the AES components and BED configuration.
> Site and soil conditions referencing AS1547 are calculated and designed by a Qualified Wastewater Designer.
> Chankar Environmental accepts no responsibility for the soil evaluation, loading calculations or DLR entered by the designer for this calculator.
> AES pipes can be cut to length on site. They are supplied in 3 meter lengths only.
> AES ONLY supply AES components as detailed in the above Bill of Materials.
> SEPTIC Tank & other components including APPROVED SAND will need to be sourced from other suppliers. Refer to www.enviro-septic.com.au .
AES-Design-V11.0-Multi-bed Calculator © Copy Right - Chankar Environmental Pty Ltd 15/2/2024 Ph: 07 5474 4055
Page 8
Surface
Drainage Good.
Vegetation Grasses &
Scattered Trees
BH 2
Borehole location.
ABN11 147 854 439
Slope Title: SITE PLAN - On-Site Effluent Disposal
measured as a percentage gradient from
AUSTRALIAN
high ground to low ground. SOIL INVESTIGATIONS Project R. Wilks, 267 Louis Bazzo Drive
Pomona
Rev.
DO NOT DIMENSION OFF THIS DIAGRAM. Date: Sep 2026 Drg No.260176-ABS .A
Page 9
AUSTRALIAN
SOIL INVESTIGATIONS
Title DETAIL PLAN - AES
Project
Rev.
Date: Drg No.
[OCR of page images]
SO00L
SEPTIC
TANK
pore ADAPTER __NSPECTION POINT
COUPLINGS RAISED CONNECTOR
' }
H ny i :
of] — Z .
Ss
300 9000
300
9600
TYPICAL BED LAYOUT & SECTION
TOP SOIL/GRASS
LOW VENT
BACK FILL
[ INSPECTION POINT
INSPECTION POINT
APPROVED SAND
ain DRAIN
300 | x
5560
7810
CRIP & SCARIFY 300mm
ABSORPTION BED TYPICAL SECTION APPLY GYPSUM 1kg/m’2
General Notes :
1. The Plumber is responsible for locating all existing services within and adjacent
the allotment prior to commencing the work.
2. This drawing is to be read in conjunction with the attached details and the
specifications and requirements of Australian Soil Investigations Absorption Report.
3. The installation is to be in strict accordance with AS 1547-2012, Local
Authority requirements and Australian Soil Investigations Absorption Report.
4. The work is to be undertaken and completed by a registered plumber.
5. Refer to Australian Soil Investigations report for all setback distances.
6. Disposal areas must be protected from inflow of surface water by bunds,
drains or mounding of surface as required.
7. Extension bed may be placed either side of AES pipes on level ground. Must
be placed on the downslope side on sloping sites.
8. Ensure system footprint is adequately ripped prior to placement of media and
pipework. Rip paralell to contours and system pipes.
ABN11 147 854 439
AUSTRALIAN
SOIL INVESTIGATIONS
174 Railway Road Cooran
ABN11 147 854 439
Title) DETAIL PLAN - AES
Project 267 Louis Bazzo Drive
Pomona
Date: Sep 2026 Drg No. 260176
Used in these records
Appendix C - Effluent Disposal Report.pdfRelated documentApplication case desk ↗
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