Council archive · source document
3. Effluent Disposal Report · MCU19/0117
WATER WISE DESIGN
3-43 Hunter St Hervey Bay
PO BOX 5485, Torquay QLD 4655
Phone: 07- 41253510
Fax: 07- 41251802
Email – [email protected]
WATER WISE DESIGN
20/08/19
Hydraulic Services Consultant
A.H.S.C.A QBSA 886793
Site and Soil Evaluation for 90 Beach Rd Noosa North Shore
The Site and Soil Evaluation and design were carried out in accordance with the following
standard and documents: -
AS 1547 – On Site Domestic Waste Water Management
Department of Natural Resources Code of Practice
AS1726-1993 Geotechnical Site Investigations
AS2698 Poly pipe and fittings for Irrigation and rural application
Development Guideline for Water Quality Management SEQ water
Plumbing Code of Australia.
The task was to design a waste water management system to treat and dispose of the
treated effluent from a new 4 bedroom home. The effluent will be treatment with a 4000
Litre Septic Tanks to an Advanced Enviro Septic Disposal area of 39m².
Site and Soil Evaluation Procedure
The following procedures were followed: -
A desk top study to review relevant planning issues.
A site assessment to record topography, geography and geology.
An assessment of site exposure and suitability.
Evaluation and determination of risk to the environment relevant to on site sewage
systems.
Calculation of the Design Irrigation Rate.
Determination and design of the most appropriate sewage facility.
Determination and design of the most appropriate land application facility.
Note: - The applicant is responsible for supplying the stamped and approved
documents to the Effluent Disposal Contractor. The applicant or the contractor
shall give 48 hours notice of time of inspection of effluent disposal area to Water
Wise Design.
Sincerely,
Christopher Searle
WATER WISE DESIGN
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3/43 Hunter Street, Hervey Bay QLD
PO Box 5485, Torquay QLD 4655
Phone: 07 4125 3510
Mobile: 0414 953 963
[email protected]
ON-SITE EFFLUENT DISPOSAL REPORT
For
PROPOSED DEVELOPMENT AT 90 BEACH ROAD
NOOSA NORTH SHORE
Prepared by Water Wise Design Pty Ltd
3/43 Hunter St
Hervey Bay 4655
Ph 07 41253510
Date 20/08/19
Page 1 of 8
Page 3
3/43 Hunter Street, Hervey Bay QLD
PO Box 5485, Torquay QLD 4655
Phone: 07 4125 3510
Mobile: 0414 953 963
[email protected]
INTRODUCTION
1.1 Purpose of Report
The effluent disposal report was commissioned by Mark Bain Construction Pty
Ltd and relates to a proposed treatment of effluent on 1 house dwellings.
1.2 Scope of Report
The report addresses issues relating to the on-site treatment and disposal of
wastewater and the potential export of pollutants from the propose complex.
The report assesses the suitability of the site for on-site effluent disposal and for
the management of sewage within the development.
References used in compiling this report are:-
Department of Local Government, Plumbing and Drainage Act Queensland
Plumbing and Wastewater Code & AS 1547-2012.
Page 2 of 8
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3/43 Hunter Street, Hervey Bay QLD
PO Box 5485, Torquay QLD 4655
Phone: 07 4125 3510
Mobile: 0414 953 963
[email protected]
THE SITE and SOIL ASSESSMENT
2.1 General
The land is at 90 Beach Rd Noosa North Shore. Currently is a natural bush
vegetation. The site is located on sand.
2.2 Slopes and Drainage
Gentle Slope on site is from west to east, drainage is to the eastern boundary
which will be used as a stormwater drainage channel to discharge to road culvert.
These works will be documented by the civil engineer.
2.3 Geology and Soils
Global Testing soil test indicates a sand soil. This is consistent throughout the
whole area. The permeability is 1.0-3.0 = 35mm/week and this indicates the soil
is Category 1 Fine to coarse sand and being structureless.
2.4 Vegetation
The vegetation covering the site is grass & scattered trees.
2.5 Bulk Density
Adequate for effluent disposal (soil structure massive).
Page 3 of 8
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3/43 Hunter Street, Hervey Bay QLD
PO Box 5485, Torquay QLD 4655
Phone: 07 4125 3510
Mobile: 0414 953 963
[email protected]
2.6 Hydraulic Conductivity
The soils on the proposed site are sand massive structure hydraulic
conductivities the amount for these soils is aprox1.0-3.0 =35mm/week
The conclusion is that the results indicate the soil is very good for drainage and
an Evapotranspiration-absorption trench will supply the treatment needs to each
dwelling. We are looking to use an Advanced Enviro-Septic treatment disposal
area. This will provide Secondary Quality Effluent.
SITE SUITABILITY ASSESSMENT
The Department of Local Government Queensland Plumbing and
Wastewater Code is the guidelines used in preparing this report.
3.1 Flood Potential
The location of the site is above flood level.
3.2 Aspect and Land Area
No parts of the site are sufficiently obscure from the sun or wind to
be ineffectual for effluent disposal. There is sufficient land area for
effluent disposal.
3.3 Slope
Areas recommended as effluent disposal site, will be in the building envelop of
each dwelling. The AES Disposal area can be installed on slope, but the
construction of the disposal area will follow the contours of the land with
diversion mound so that overland flow / stormwater will not enter the disposal
area.
Page 4 of 8
Page 6
3/43 Hunter Street, Hervey Bay QLD
PO Box 5485, Torquay QLD 4655
Phone: 07 4125 3510
Mobile: 0414 953 963
[email protected]
3.4 Runoff
The dwellings roof water piped to tank then kerb.
Surface water sheet spread to front of land.
3.5 Surface Dampness
The site is well drained.
3.6 Landform
The recommended disposal sites are not in areas on foot slopes,
drainage plains or incised channels.
3.7 Geology
The underlying strata will not present any constraints to the
proposed effluent disposal due to the underlying
sand soil.
3.8 Groundwater
Nil encountered.
3.9 Setback Distances
Minimum distances from property boundaries and water courses
are all well within those prescribed by AS/ANZ 1457:2012 effluent
disposal areas from buildings are similarly complied with.
Page 5 of 8
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3/43 Hunter Street, Hervey Bay QLD
PO Box 5485, Torquay QLD 4655
Phone: 07 4125 3510
Mobile: 0414 953 963
[email protected]
EFFLUENT LOADING RATE
4.1 Introduction
The proposed development consists of 1 Dwellings of 4 bedroom and 7 person
have been allowed for.
The loading rates have been calculated based AS 1547:2012.
4.2 Australian Standard 1547:2000
From AS/ANZ 1547:2012 appendix 4.2 D Typical Domestic Waste-Water Flow
Design Allowances a 7 person dwelling with town water & standard water saving
devices.
Typical waste water flow allowance in L/person/day = 145.
This equates to total effluent generation per day by 7 persons by 145L/s =1160
Ls per day. .
The Method of disposal can be a 4000 litre storage tanks / All purpose Septic
Tank to a 39m² in ground Disposal area.
Page 6 of 8
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3/43 Hunter Street, Hervey Bay QLD
PO Box 5485, Torquay QLD 4655
Phone: 07 4125 3510
Mobile: 0414 953 963
[email protected]
ON-SITE DISPOSAL SYSTEM
5.1 Introduction
The on-site sewerage management system involves two primary components: -
treatment and disposal.
5.2 Effluent Treatment & Disposal
The treatment of each dwelling will be from a 4000 litre all- purpose septic tank.
This system is a primary treatment and will have no pumps (each site will need to
be reviewed), the gravity flow from the house to the septic tank, then to the
Advance Enviro-Septic disposal area. The required size of the effluent disposal
area from AS 1547 is 39m².
5.5 Servicing & Maintenance
The All-purpose septic tank will be pumped out each 5 years to remove the
bacterial crust, tank is to be filled with water. AES have a maintenance manual.
Regards,
Chris Searle
Director, Principal Designer
P: 0414 953 963
E: [email protected]
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Water Wise Design – 4125 3510 / 0414 953 963 Page 8 of 8 [OCR of page images] Water Wise Design — 4125 3510 / 0414 953 963 Page 8 of 8
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Advanced Enviro-septic Design Calculator V8.6 ©
"Always the BEST Option" until site and soil conditions rule it out.
Site
90 Beach Rd Noosa North Shore State Qld Post Code 4655
Address
Client
Date of Site Visit
Name
Designer Lic
Designers Designers Ph
Number
Name Number
Lic (eg.QBCC)
Plumber Ph Plumb / Drainer
Plumber
Number Lic Number
Name
Council Designers AES
Date 21/08/2019
Area Cert Number
This Calculator is a guide only, receiving soil classification, surface water, water tables and all other site constraints addressed by the qualified designer.
System Designers site and soil calculation data entry IMPORTANT NOTES
Enter the AES litre/meter loading rate, "30" for Advanced Secondary or "38" Secondary 30 >> This design is for an ADVANCED SECONDARY system
Is this a new installation Y or N y >> Minimun single vent size is 80mm or 2 x 50mm house vents
Number of person 8 a septic tank outlet filter is NOT RECOMMENDED
Daily Design Flow Allowance Litre/Person/Day 145
Number of rows required to suit site constrants 3 >> Longer AES runs are better than multiplule short runs.
Infiltration surface Soil Category as established by site and soil evaluation. CATEGORY 1
Design Loading Rate based on site & soil evaluation DLR (mm/day) 30
Bore log depth below system Basel area 2 >> Min depth below basel area is 600 mm to establish water table or restrictive layer
Enter System footprint Slope in % for standard AES systems to calculate extension
1 >> Some Councils have minimum falls to Land application areas ?
Is this design a gravity system with no outlet filter? Y or N y >> A House Vent & LOW VENT required on this system
PLEASE CHECK YOU HAVE FALL FROM TANK TO AES SYSTEM PIPES
COMMENTS :- " The outcome must be important to everyone. "
- Designers need to be familar with special requirements of Local Authorities. IE - Minimun falls from Septic tank outlets to Land application areas. etc
- Plumbers are reminded to practice good construction techniques as per AS 1547 and as provided on AES installation instructions supplied with components.
AES System Calculator Outcomes AES dimensions
Total System load - litres / day (Q). 1160 l/d AES System System Extension
Min Length of AES pipe rows to treat loading 12.9 lm Lth m : (L) 15.6 15.6
Number of FULL AES Pipe lengths per row 5 lths Width m:(W) 1.80 0.68
Sand Depth
Total Capacity of AES System pipe in Litres 3180 ltr. 0.75 0.15
:
AES Additional infiltration extension required 10.6 m2 Area m2 28.1 10.6
DO YOU WISH TO 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 .
for this Basic Serial design is 15.6 x 2.48 = 38.7 m2 total
Code AES System Bill of Materials. Chankar Environmental Use Only
AES-PIPE AES 3 mtr Lths required 15 lths
AESC AESC Couplings required 12 ea
AESO AESO Offset adaptors 6 ea
AESODV AES Oxgen demand vent 1 ea
AES-IPB AES 100mm Inspection point base 2 ea
AES Equ AES Speed Flow Equaliser ea
AES DESO Double Offset Adaptors ea
TOTAL SYSTEM SAND REQUIRED (Guide Only) 27 m3
PLEASE email your AES CALC and Drawings to
[email protected] [email protected]
> The AES Calculator is a design aid to allow checking of the AES components and configuration and is a guide only. Site and soil
conditions referencing the AS 1547 standard are calculated and designed by a Quailified Designer.
> Chankar Environmental has no responsibility for the soil evaluation, loading calculations or DLR entered by the designer for this calculator.
> AES pipes can be cut to lenght on site. They are supplied in 3 meter lths only.
AES-Design-V8.6-Calculator © Copy Right - Chankar Environmental pty ltd 14/3/2016
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