Council archive · source document
1890 Effluent Disposal Review · MCU20/0022
Effluent Disposal Review
Proposed Residences
17 March 2020
Job No: SER 1890
Client
GJ Gardner Homes
(Sunshine Coast North)
Site Location
#292/ Lot 7 (RP 858525)
Illoura Place
Cooroibah QLD 4565
Geotechnical Soils Pty Ltd
ABN: 15 895 975 485
Sunshine Coast, Queensland
Office: 0413 951 991
[email protected]
www.geotechnicalsoils.com.au
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Page 2
Effluent Disposal Review
1 Introduction
1.1 At the request of GJ Gardner Homes (Sunshine Coast North), Geotechnical Soils have
undertaken an effluent disposal review for the proposed residence and cottages, on
#292/ Lot 7 (RP858525) Illoura Place, Cooroibah QLD 4565
1.2 The purposes of the review were to:
Review existing report documents
Conduct a site walkover
Establish soil parameters
Design an effluent land application area
1.3 Review procedures were in accordance with the following:
AS1289 – Methods of testing of soils for engineering purposes.
AS1547 – On-site domestic wastewater management (2012)
AS1726 – Geotechnical Site Investigations
Department of Natural Resources, “On-site Sewerage Code” (July 2002)
Queensland Plumbing and Wastewater Code (2019)
1.4 Existing documents referenced include:
Noosa Shire Council - Flood Overlay Mapping
Extract of Registered Plan (RP 858525)
Google Earth - Aerial Photograph
Axis Surveys - Contour / Identification Survey, site no:1906585, sheets: 1-4, dated
10/12/19
Soil Investigation by Geotechnical Soils, ref SER 1890, dated 16/12/19
Architectural Plans by GJ Gardner Homes, job no: GJGSCN 190219a, pages:1-4,
dated: 19/12/19 (residence)
Architectural Plans by GJ Gardner Homes, job no: GJGSCN 1902186, pages:1-4,
dated: 11/2/20 (cottages)
1.5 The proposed residence is of 5 bedrooms /7-person occupancy with tank water supply
and standard water saving devices installed. Additionally, there are three serviced
cottages of 2-bedroom configuration. A design effluent loading of 3 persons per cabin.
A design effluent loading of 120litres/person/day (Table H1) has been adopted.
Page 2
Page 3
2 Site Description
2.1 Land Description
The allotment is 3.777ha in area, and generally of taper, elongated rectangular shape.
Regionally the allotment is upon a broad, drainage deficient plain. There are a number
of shed/ residential structures (3) established and visual evidence of placed fill over
various areas.
Three separate construction areas advised-:
- residential structure to rear lot third
- detached cottages (3) within the central lot third
It is understood all residential / cottage structures are to be established as 'slab-on-
ground'. It is anticipated all building areas will be subject to some filling. All existing fill
should be deemed as 'uncontrolled'. It is also suggested all existing filling within the
building areas should be removed and replaced in a professional manner. On-site
effluent disposal required with tank water supplied. Photographs attached.
2.2 Vegetation
Cleared melaleuca bushland with large gum trees over higher contours(main residence).
Groundcover includes short/ long pasture grasses. Refer to photographs.
2.3 Crossfall
Contours within identified building areas are shown on PLATE 1/ 2 and 3. Also on PLATE
6 are contours and Council's flood inundation line. In general contours fall to the west
and broadly divergent within the rear lot half. Contour generally range from RL 10 metres
to 8 metres. The Q100 appears to be around RL 8.3 metres. Earthworks has included
minor filling to the main residence area and moderate filling within the adjoining cottages
areas.
2.4 Drainage
The Council flood contour overlay plan attached as PLATE 6 and appears to
approximate RL 8.3 metres. Poor/ very poorly drained allotment. The Council Flood
Study is attached as APPENDIX B.
2.5 Regional Geology
A regolith of the Tiaro Coal Measures that is typically represented by leached, kaolinised
clays based on siltstone, mudstone and sandstone rock types. A veneer of sandy
'slopewash' can overlie the clay profile.
2.6 Soil Investigation
To establish representative details, ten boreholes were advanced at selected locations.,
Test locations are shown on PLATE 2/3 with subsoil profiles/ test values in APPENDIX
A. Boreholes advanced by a small vehicle mounted drilling rig and dynamic cone
penetrometer testing at selected locations.
Page 3
Page 4
Main Residence:-
Represented by boreholes 1-5. Minor filling identified with a raised platform at BH 1/2
while BH 3 appears to represent a remnant fire pit. The BH 4/5 represent the
undisturbed divergent flank. Silty/ clayey SAND topsoils transition to (CL/CH) sandy/
silty CLAYS. No rock within 2.3 metres of the surface. The clays are (CH) at depths
ranging 0.6/1.0 metres. Uncontrolled fill depths up to 0.7metres. The residual clays are
of stiff consistencies.
Detached Cottages:-
Represented by boreholes 6/7. A silty / clayey / gravelly SAND upper soil profiles
extended to 0.35/ 0.65 metres depth. Clays (CH) below and extend beyond 2.2 metres.
The upper sandy profile was medium dense/ dense and with stiff clays. Additional
boreholes 8 -10 revealed moderate fill depths and with some rock cobbles insitu. The
land surface is irregular and suggests an extended time-line of filling. Filling of 0.4/ 1.0
metres with the fill a (CL/CH) sandy CLAY. Dynamic cone penetrometer test values
enhanced by gravel insitu the fill. The remnant silty topsoils have not been stripped prior
to filling. The profile transitions to (CH) clays below 1.05 - 1.3 metres depth. The filling
is uncontrolled. Moderate consistency subsoils.
2.7 Groundwater
Not encountered but seasonally likely
3 Effluent Disposal Site Assessment
3.1 Site assessment procedures were in accordance with AS1547 – 2012 (D3.1.2)
(modified procedure) were applied to the revealed soil profile.
3.2 We would conclude the review areas are represented by the soil categories:
4 – clay loam to 5 – light clay
We propose a conservative design soil category of 5 – light clay
3.3 Due to the proximity of the Q100 flood contours, soil profile and structure, we propose
two separate effluent systems. One system for the residence and separate system for
the three detached cottages. The systems will produce ‘modified’ advanced secondary
effluent quality and combine this with fixed surface irrigation for land application.
Page 4
Page 5
3.4 Effluent Quality
In accordance with the Department of Natural Resources (DNR) – “On-site Sewerage
Code”, the appropriate method of on-site disposal is proportional to the effluent quality.
Effluent quality is defined by three broad categories:
Primary effluent - typically outflow from a septic tank will be disposed in a conventional
absorption trench system.
Secondary effluent - where aerobic microorganisms biologically degrade organic matter.
(AWTS - aerated wastewater treatment system / aerobic sand filtration).
Advanced Secondary effluent - a modified secondary treatment system where the
nutrients including nitrogen and phosphorous are reduced to environmentally
acceptance levels.
Effluent Quality
“Modified” Advanced
Secondary Effluent
mg/L
Biochemical Oxygen Demand <10
Suspended Solids <30
Total Nitrogen <25
Total Phosphorus <10
Thermotolerant Coliform (org/100mL) <10
3.5 For each given effluent quality, the criteria for exclusion and separation also varies,
with reference to the Queensland Plumbing and Wastewater Code, 2019:
Recommended horizontal separation distances for subsurface land application areas
Horizontal Separation
Feature
Distance (m)
Property boundaries, pedestrian paths and walkways, 2
recreation areas
Water edge of a swimming pool 6
Dwellings, recreation areas 10*
Notes: For primary effluent, the distance from an in-ground portable water tank must be 15 metres.
The separation distances are based on a spray plume with a diameter not exceeding 1m or a plume height
not exceeding 0.3m above the finished surface level. Distances are given in metres from the edge of the
irrigate wetted area to any point of thefeature.
Page 5
Page 6
Recommended horizontal separation distances for protection of water quality
Recommended
Feature
Horizontal Separation
• Top of bank of permanent water course; Distance
• Top of bank of Intermittent water course;
“Modified” Advanced
• Top of bank of a lake;
Secondary effluent: 10 metres
• Top water level of a surface water source used for agriculture,
(horizontal)
aquaculture or stock purposes;
• Easement boundary of unlined open stormwater drainage
channel or drain.
“Modified” Advanced
Bore or a dam used or likely to be used for human and/or
Secondary effluent: 10 metres
domestic consumption.
(horizontal)
“Modified” Advanced
Unsaturated soil depth to a permanent water table. Secondary effluent: 0.3
metres (vertical)
Notes:
The separation distances are recommended and the local government may upon considering the
public health and environmental risks reduce or increase the distances given.
4 Design Consideration
4.1 Design Parameters (Residence)
The “design” soil category is based on 5 – light clay.
The inferred design-loading rate (DIR) for these soil types is 3mm/day
Wastewater flow allowance for the residence is 120 litres/person/day
For a five-bedroom residence, we have allowed for 7 persons
A spa bath is not proposed
Total loading = 840 litres/day
4.2 Calculated Irrigation Area
For a design irrigation rate (DIR) of 3mm /day, this results in an irrigation area of
280m2.
4.3 Noosa Council require a minimum 9 fixed sprinklers per 100m² of effluent application
area. We propose twenty-five (25) fixed sprinklers.
Page 6
Page 7
4.4 Design Parameters (Cottage)
The “design” soil category is based on 5 – light clay.
The inferred design-loading rate (DIR) for these soil types is 3mm/day
Wastewater flow allowance for the residence is 120 litres/person/day
For a two-bedroom cottage, we have allowed for 3 persons (three cottages)
Total loading = 360 litres/day per cabin
4.5 Calculated Irrigation Area
For a design irrigation rate (DIR) of 3mm /day, this results in an irrigation area of
360m2.
4.6 Noosa Council require a minimum 9 fixed sprinklers per 100m² of effluent application
area. We propose thirty (30) fixed sprinklers.
4.7 Precautions
The client proposes to adopt surface irrigation methods, which will require the effluent
to be disinfected. The following precautions should be observed:
Land Application Area:
Not to be used for purposes that compromise the effectiveness of the system or
access for future maintenance purposes.
Be used only for effluent application.
Have boundaries clearly delineated by appropriate vegetation or other type of
border.
Have no runoff or seepage of effluent beyond the designated areas.
Irrigation System:
Distribute the effluent evenly within the designated areas.
Control the droplet size, throw and plume height of the sprinkler system so that
the risk of aerosol dispersion and effect of wind drift distributing any effluent
beyond the designated area is negligible.
Have warnings, complying with AS 1319 or NZS/AS 1319, at the boundaries
of the designated areas in at least two places, clearly visible to property users,
with wording such as, “Recycled Water – Avoid Contact – DO NOT DRINK” .
Ensure that the effluent does not come into contact with people, domestic or
farm animals of any crops intended for human consumption.
Page 7
Page 8
4.8 Proposed System: (Residence)
The client proposes to dispose of the effluent to the north and northwest of the
residential area, established as a linear projection along the driveway and across the
northern face of the residence.
The system will consist of the following:
The application areas will be established as a mulched and shrubs can be
established at each outlet.
A typical layout is shown on PLATE 4.
A 25mm diameter delivery line (purple stripe of flagged) from the treatment system.
The line is to be buried.
25 fixed sprinklers (wobblers or rota-frame) are to be established on a 300mm hard
riser and configured as 5 X 5 sprinklers and sequential lateral dosing by a 6-port
indexing valve.
The sprinklers are to be 3 metres apart, 3 metres from the driveway and 10 metres
from the residence.
The indexing valve should be adjacent the highest contour of the application area.
With a 1.0 throw allowance (AS 1547, M 9.4.3/e) effluent is excluded from within 3
metres of the driveway, property boundary and with 10 metres of the residence.
Mulch is to be placed within a 1.0 metres radius of each sprinkler outlet.
4.9 Proposed System: (Cottages)
The client proposes to dispose of the effluent to the centrally and to the east/ southeast.
The system will consist of the following:
The application areas will be established as a mulched and shrubs can be
established at each outlet.
A typical layout is shown on PLATE 5.
A 25mm diameter delivery line (purple stripe of flagged) from the treatment system.
The line is to be buried.
30 fixed sprinklers (wobblers or rota-frame) are to be established on a 300mm hard
riser and configured as 6 X 5 sprinklers and sequential lateral dosing by a 6-port
indexing valve.
The sprinklers are to be 3 metres apart, 3 metres from the driveway and laterals 10
metres from a cottage.
The indexing valve should be adjacent the highest contour of the application area.
With a 1.0 throw allowance (AS 1547, M 9.4.3/e) effluent is excluded from within 3
metres of the driveway, property boundary and with 10 metres of the residence.
Mulch is to be placed within a 1.0 metres radius of each sprinkler outlet.
The treatment plant electronic box must be above the Q100 flood contour.
Page 8
Page 9
4.10 Surface irrigation methods of effluent land application are appropriate for this site due
to:
Rural residential parcel
Solar orientation
Clay subsoil (friable)
Landscaping opportunities
4.11 In 1993, Beavers and Gardner completed a scientifically based alternative into
calculating set back distances using the “Viral Die-off Method”, [Beavers, P.D. and
Gardner, E.A. (1993), Prediction of virus transport through soils, Australian Water
and Wastewater Association, Technical Papers of the 15th Federal Convention, Gold
Coast, Australia, 18-23 April 1993 (Volume 2, pp 530-535)]. This applies only to the
wastewater moving in saturated soils, for example, in shallow groundwater beneath an
absorption trench or surface irrigation area. “Modified” Advanced Secondary effluent
is to be excluded 10 metres from a defined watercourse or dam (directional
separation distance), however, using the Beavers Gardner Viral Die-off Method for
virus inactivation over distance:
=
∙ ∙
Where the parameters are as follows:
t = Travel time in days. This is the time required for viruses originating in the
wastewater to be inactivated (i.e. reduced t acceptable numbers by
natural mortality processes) as they move down gradient in the
groundwater. A typical value of 22 days is used.
K = Saturated hydraulic conductivity m/day [Permeability “P” may be used for
K]
i = Hydraulic gradient m/m [use surface slope as approximation]
= Effective porosity of the soil [generally use 0.2, or 0.1 for sand free of
fines]
D = The seatback distance (metres) that the groundwater has travelled during
the travel time (22 days). This refers to the subsurface wastewater
movement, and not, for example, to wastewater flowing over the ground
surface from irrigation areas of failing absorption trenches.
Page 9
Page 10
If the following parameter values are input into the formula:
t = 22;
K = 0.12 (representative)
I = 0.025 (1:40);
= 0.2;
an indicative setback distance (D) of less than one metre results. This is less than
the 10 metres horizontal setback distance adopted. Further, there are no dams, and/or
watercourses within 10 metres from the proposed effluent land application area
5 Conclusion
5.1 Soil absorption properties and site features are adequate for on-site effluent disposal
provided the recommendations made herein are followed and/or amended by a
licensed plumber or suitably qualified-system designer.
5.2 The homeowner should fully inform themselves about the on-site wastewater system
on their property and its operation and maintenance. The supplier and/or installer
of the treatment system will supply their operation and maintenance guideline.
5.3 Attached as APPENDIX B is a generic operation and maintenance guideline relevant
to secondary and advanced secondary effluent qualities.
Yours faithfully
Graham Smith
QBCC 150 384 77
Geotechnical Soils Pty Ltd
QBCC 150 384 82
Page 10
Page 11
APPENDIX A Sub Soil Profiles [OCR of page images] D Sub Soil Profiles
Page 12
Soil Investigation Summary
Client GJ GARDNER HOMES SUNSHINE COAST NORTH Date 16/12/2019
Site Address Lot 7, RP 858525, #292 Illoura Place, Cooroibah 4565 Job No SER 1890
Test No. 1
Location Main Residence - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments
0.1 1 2.1
100 Fill Sandy CLAY low-medium plasticity, grey brown/ orange brown, CL
fine-medium sands, with silt, some medium-coarse gravel, trace 0.2 4 2.2
cobbles, slightly moist, soft/firm. 0.3 7 2.3
250 Silty SAND fine-medium sands, dark grey, trace clay/gravel, SM 0.4 7 2.4
slightly moist/moist, medium dense.
0.5 4 2.5
500 Clayey SAND fine-medium sands, yellow brown, trace fine SC
gravel, slightly moist/moist, medium dense. 0.6 4 2.6
1000 Silty CLAY medium plasticity, orange yellow brown/ orange, with CL (friable) 0.7 4 2.7
fine sand, trace fine gravel, moist, stiff. 0.8 3 2.8
1700 Silty CLAY high plasticity, orange red brown with grey mottle, CH
some fine sand, moist, stiff.
0.9 4 2.9
2200 Silty CLAY high plasticity, maroon/ white, trace fine sand/fine- CH END 1.0 4 3.0
medium gravel, moist, stiff. 1.1 3 3.1
1.2 3 3.2
1.3 3 3.3
1.4 4 3.4
1.5 3 3.5
1.6 3 3.6
1.7 3 3.7
1.8 3 3.8
1.9 3 3.9
2.0 3 4.0
Test No. 2
Location Main Residence - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments
0.1 1 2.1
350 Fill Sandy CLAY low plasticity, grey brown/ orange brown, fine- CL
coarse sands, some fine-coarse gravel, trace cobbles, slightly 0.2 1 2.2
moist, soft/firm. 0.3 3 2.3
450 Silty SAND fine-medium sands, grey/ grey yellow, some clay, SM 0.4 2 2.4
slightly moist/moist, medium dense.
0.5 4 2.5
700 Clayey SAND fine-medium sands, grey yellow/ yellow brown, SC
some silt, trace fine gravel, moist, medium dense. 0.6 6 2.6
850 Sandy CLAY low-medium plasticity, yellow brown/ orange yellow CL 0.7 6 2.7
brown, fine-coarse sands, some fine gravel, moist, stiff. 0.8 5 2.8
1500 Silty CLAY high plasticity, orange red brown with grey yellow CH
0.9 4 2.9
mottle, some fine-medium sand, moist, stiff.
2300 Silty CLAY high plasticity, maroon/ orange with light grey/ white CH END 1.0 5 3.0
mottle, trace fine gravel/fine sand, moist, stiff/very stiff. 1.1 3 3.1
1.2 3 3.2
1.3 3 3.3
1.4 3 3.4
1.5 3 3.5
1.6 3 3.6
1.7 3 3.7
1.8 3 3.8
1.9 3 3.9
2.0 5 4.0
14/40 Claude Boyd Parade Office: 0413 951 991
"PRIMEX BIZ HUB" [email protected]
Bells Creek QLD 4551
Page 13
Soil Investigation Summary
Client GJ GARDNER HOMES SUNSHINE COAST NORTH Date 16/12/2019
Site Address Lot 7, RP 858525, #292 Illoura Place, Cooroibah 4565 Job No SER 1890
Test No. 3
Location Main Residence - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments
0.1 1 2.1
200 Fill SAND fine-medium sands, black, with clay, some silt, slightly SP
moist, loose/medium dense. 0.2 3 2.2
500 Fill Clayey SAND fine-coarse sands, orange yellow brown, with fine SC 0.3 4 2.3
gravel, dry, loose/medium dense. 0.4 3 2.4
700 Fill Clayey SAND fine-coarse sands, dark grey yellow, with silt, some SC (ash insitu) 0.5 9 2.5
fine gravel, dry, loose/medium dense.
0.6 6 2.6
1000 Sandy CLAY medium-high plasticity, orange red brown with CH
yellow mottle, fine-medium sands, with silt, trace fine gravel, 0.7 6 2.7
moist, stiff/very stiff. 0.8 6 2.8
1800 Silty CLAY high plasticity, red/ red brown with grey mottle, some CH
0.9 6 2.9
fine sand, moist, stiff.
2300 Silty CLAY high plasticity, maroon/ red with white mottle, some CH END 1.0 5 3.0
fine-medium gravel, trace fine sand, moist, stiff. 1.1 4 3.1
1.2 4 3.2
1.3 3 3.3
1.4 3 3.4
1.5 3 3.5
1.6 4 3.6
1.7 3.7
1.8 3.8
1.9 3.9
2.0 4.0
Test No. 4
Location Main Residence / Effluent- see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments Effluent Soil Cat.
0.1 1 2.1
150 Clayey SAND fine-medium sands, dark grey SC 3 - Massive
brown, with silt, slightly moist/moist, 0.2 3 2.2
loose/medium dense. 0.3 3 2.3
300 Sandy CLAY low plasticity, grey yellow brown, CL 4 - Moderately 0.4 2 2.4
fine-medium sands, moist, stiff.
0.5 3 2.5
750 Sandy CLAY low-medium plasticity, yellow CL 5 - Strongly
brown/ orange yellow, fine-medium sands, 0.6 3 2.6
some silt, trace fine gravel, moist, stiff/very 0.7 3 2.7
stiff.
0.8 3 2.8
1400 Silty CLAY high plasticity, orange red yellow CH 6 - Strongly
brown, with fine-medium sand, trace fine 0.9 4 2.9
gravel, moist, stiff. 1.0 4 3.0
1800 Silty CLAY high plasticity, mottled white/ red/ CH 6 - Weakly
1.1 3 3.1
maroon/ orange yellow, trace fine gravel/fine
sand, moist, stiff. 1.2 3 3.2
2200 CLAY high plasticity, light grey/ white with END 6 - Weakly 1.3 3 3.3
maroon mottle, with silt, trace fine
sand/medium-coarse gravel, lenses of (GC)
1.4 4 3.4
clayey GRAVEL, moist, stiff. 1.5 4 3.5
1.6 3 3.6
1.7 3 3.7
1.8 3.8
1.9 3.9
2.0 4.0
14/40 Claude Boyd Parade Office: 0413 951 991
"PRIMEX BIZ HUB" [email protected]
Bells Creek QLD 4551
Page 14
Soil Investigation Summary
Client GJ GARDNER HOMES SUNSHINE COAST NORTH Date 16/12/2019
Site Address Lot 7, RP 858525, #292 Illoura Place, Cooroibah 4565 Job No SER 1890
Test No. 5
Location Effluent (main residence) - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments Effluent Soil Cat.
0.1 2.1
250 Clayey SAND fine-medium sands, dark grey SC 3 - Massive
brown, with silt, slightly moist/moist, 0.2 2.2
loose/medium dense. 0.3 2.3
600 Silty CLAY medium plasticity, yellow brown, CL 5 - Strongly 0.4 2.4
with fine-medium sand, trace fine gravel,
moist, stiff/very stiff. 0.5 2.5
1200 Silty CLAY high plasticity, red/ red brown/ CH 6 - Strongly 0.6 2.6
yellow brown, with fine-medium sand, trace 0.7 2.7
medium-coarse gravel, moist, stiff.
0.8 2.8
1500 Silty CLAY high plasticity, light grey/ white/ CH END 6 - Weakly
maroon, trace fine gravel/fine sand, moist, 0.9 2.9
stiff. 1.0 3.0
1.1 3.1
1.2 3.2
1.3 3.3
1.4 3.4
1.5 3.5
1.6 3.6
1.7 3.7
1.8 3.8
1.9 3.9
2.0 4.0
Test No. 6
Location Detached Cottage - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments
0.1 3 2.1
200 Silty SAND fine sands, grey / dark grey yellow, trace clay, dry, SM
loose/medium dense. 0.2 4 2.2
350 Silty SAND fine sands, light yellow brown, some clay/fine gravel, SM 0.3 8 2.3
dry, medium dense/dense. 0.4 12 2.4
650 Silty GRAVEL fine-medium gravel, yellow/ grey yellow, with fine- GM 0.5 11 2.5
coarse sand, some clay, dry, medium dense/dense.
0.6 6 2.6
1100 Silty CLAY medium-high plasticity, red brown with grey mottle, CH
with fine-medium sand, trace fine gravel, moist, stiff/very stiff. 0.7 5 2.7
1700 Silty CLAY high plasticity, maroon/ red/ light grey, some fine CH 0.8 5 2.8
sand, trace fine gravel, moist, stiff.
0.9 3 2.9
2200 Silty CLAY high plasticity, light grey with maroon mottle, trace fine CH END
gravel/fine sand, moist, stiff. 1.0 2 3.0
1.1 2 3.1
1.2 2 3.2
1.3 2 3.3
1.4 2 3.4
1.5 4 3.5
1.6 3 3.6
1.7 3 3.7
1.8 4 3.8
1.9 3.9
2.0 4.0
14/40 Claude Boyd Parade Office: 0413 951 991
"PRIMEX BIZ HUB" [email protected]
Bells Creek QLD 4551
Page 15
Soil Investigation Summary
Client GJ GARDNER HOMES SUNSHINE COAST NORTH Date 16/12/2019
Site Address Lot 7, RP 858525, #292 Illoura Place, Cooroibah 4565 Job No SER 1890
Test No. 7
Location Effluent (cottages) - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments Effluent Soil Cat.
0.1 2.1
200 Silty SAND fine sands, grey, trace clay, SM 2 - Massive
slightly moist, loose/medium dense. 0.2 2.2
350 Clayey SAND fine-medium sands, grey yellow SC 3 - Massive 0.3 2.3
brown, with silt, some fine gravel, slightly 0.4 2.4
moist, medium dense.
0.5 2.5
800 Silty CLAY high plasticity, light grey with light CH 6 - Moderately
brown/ yellow mottle, some fine sand, trace 0.6 2.6
fine gravel, moist, stiff. 0.7 2.7
1500 Silty CLAY high plasticity, light grey with light CH END 6 - Weakly 0.8 2.8
yellow/ yellow mottle, trace fine sand, moist,
stiff. 0.9 2.9
1.0 3.0
1.1 3.1
1.2 3.2
1.3 3.3
1.4 3.4
1.5 3.5
1.6 3.6
1.7 3.7
1.8 3.8
1.9 3.9
2.0 4.0
Test No. 8
Location Adjoining Cottages - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments
0.1 2 2.1
500 Fill Sandy CLAY light brown/ grey brown, fine-coarse sands, with fine- CL
coarse gravel, trace cobbles, slightly moist/moist, firm/stiff. 0.2 6 2.2
850 Silty SAND fine-medium sands, grey/ dark grey, dry, medium SM 0.3 6 2.3
dense/dense. 0.4 6 2.4
1050 Clayey SAND fine-medium sands, light grey / light grey yellow SC 0.5 6 2.5
brown, with silt, slightly moist/moist, medium dense/dense.
0.6 13 2.6
1300 Silty CLAY high plasticity, yellow brown/ light grey/ grey, with fine CH (friable)
sand, moist, stiff/very stiff. 0.7 16 2.7
2200 Silty CLAY high plasticity, light grey/ yellow/ light grey yellow, CH END 0.8 2.8
trace fine sand, moist, stiff.
0.9 2.9
1.0 3.0
1.1 3.1
1.2 3.2
1.3 3.3
1.4 3.4
1.5 3.5
1.6 3.6
1.7 3.7
1.8 3.8
1.9 3.9
2.0 4.0
14/40 Claude Boyd Parade Office: 0413 951 991
"PRIMEX BIZ HUB" [email protected]
Bells Creek QLD 4551
Page 16
Soil Investigation Summary
Client GJ GARDNER HOMES SUNSHINE COAST NORTH Date 16/12/2019
Site Address Lot 7, RP 858525, #292 Illoura Place, Cooroibah 4565 Job No SER 1890
Test No. 9
Location Adjoining Cottages - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments
0.1 3 2.1
200 Fill Clayey SAND fine-coarse sands, light brown/ orange brown, SC
slightly moist, loose/medium dense. 0.2 6 2.2
1000 Fill Sandy CLAY medium-high plasticity, white/ light grey brown, fine- CH 0.3 5 2.3
medium sands, with silt, trace fine-medium gravel, slightly moist, 0.4 5 2.4
firm/stiff.
0.5 4 2.5
1300 Clayey SAND fine-medium sands, grey yellow brown, with silt, SC
moist, medium dense. 0.6 4 2.6
1500 Silty CLAY high plasticity, yellow brown/ light grey yellow, with CH 0.7 4 2.7
fine sand, moist, stiff. 0.8 4 2.8
2200 Silty CLAY high plasticity, light grey with slight yellow mottle, CH END
0.9 3 2.9
trace fine sand, moist, stiff/very stiff.
1.0 2 3.0
1.1 3 3.1
1.2 4 3.2
1.3 5 3.3
1.4 4 3.4
1.5 3 3.5
1.6 3 3.6
1.7 4 3.7
1.8 4 3.8
1.9 3.9
2.0 4.0
Test No. 10
Location Adjoining Cottages/effluent option - see PLATE 1 Test Values (per 100mm)
Procedure:AS 1289.6.3.2/3-1997
Depth Origin Description (Unified Classification) Symbol Comments Effluent Soil Cat.
0.1 5 2.1
400 Fill Sandy CLAY medium-high plasticity, light CH 5 - Moderately
grey brown/ white, fine-medium sands, with 0.2 6 2.2
silt, trace medium-coarse gravel, slightly 0.3 4 2.3
moist, firm/stiff.
0.4 4 2.4
500 Silty SAND fine sands, dark grey, trace clay, SM 2 - Massive
moist, medium dense. 0.5 6 2.5
750 Clayey SAND fine sands, grey yellow brown, SC 3 - Massive 0.6 7 2.6
some silt, moist, medium dense. 0.7 6 2.7
1250 Silty CLAY medium plasticity, yellow brown/ CL 5 - Strongly 0.8 6 2.8
yellow, with fine-medium sand, moist, stiff.
1800 Silty CLAY high plasticity, light grey/ white CH END 6 - Weakly
0.9 5 2.9
slight maroon mottle, trace fine sand, moist, 1.0 5 3.0
stiff.
1.1 3 3.1
1.2 3 3.2
1.3 2 3.3
1.4 3 3.4
1.5 2 3.5
1.6 3 3.6
1.7 2 3.7
1.8 2 3.8
1.9 3 3.9
2.0 4.0
14/40 Claude Boyd Parade Office: 0413 951 991
"PRIMEX BIZ HUB" [email protected]
Bells Creek QLD 4551
Page 17
Interpretations, Terms and Symbols Limitations 1. This document is supplied to a specific person for a specific purpose with the scope of review defined by the client’s requests and with reference to the relevant industry standards. 2. The details within this report are based on site and soil conditions encountered at that time. 3. Assessment methods and procedures are in accordance with the referenced standards. 4. The soil profiles presented represent that actual location and can be extrapolated to render an opinion on overall subsurface conditions within a defined area. 5. The transition between soil types and layers in both vertical and horizontal dimensions can be more gradual or abrupt than this document indicates and over time, manmade or natural events may alter the site conditions. 6. External documentation referenced which can be included: fill certification, soil profiles, laboratory test results and consolidation parameters are included with an acknowledgement and understanding that the conclusions are the responsibility of that documents author. Review Procedures AS 1289 Methods of Testing of Soils for Engineering Purposes AS 1726 Geotechnical Site Investigations AS 2870 Residential Slabs and Footings – Constructions AS 3798 Guidelines on Earthworks for Commercial and Residential Development AS 4055 Wind Loads for Housing The following glossary of terms used in the description of the prevailing soil conditions is compliant with Unified Classification System with soil profile depths recorded as the END depth of that soil type.
Page 18
D depth of that soil type.
Soil Descriptions
Description and Classification of Soils for Geotechnical Purposes: Refer to AS1726-1993 (Appendix A).
The following chart (adapted from AS1726-1993, Appendix A, Table A1) is based on the Unified Soil Classification System (USCS).
Soil Colour: Is described in the moist condition using black, white, grey, red, brown, orange, yellow, green or blue. Borderline cases can be described
as a combination of two colours, with the weaker followed by the stronger. Modifiers such as pale, dark or mottled, can be used as necessary. Where
colour consists of a primary colour with secondary mottling, it should be described as follows:
(Primary) mottled (Secondary). Refer to AS 1726-1993, A2.4 and A3.3.
USCS
Particle Group
Major Divisions Typical Names Laboratory Classification
size mm Symbol
% < 0.075 mm Plasticity of Cu= D60 Cc = (D 30)2
NOTES
(2) fine fraction D10 (D10)(D60)
BOULDERS
(more than half of material less than 63 mm is larger than 0.075mm)
200
COBBLES
63 Well graded gravels and
Between 1
GW gravel-sand mixtures, little or 0-5 >4 (1) Identify fines by
and 3
no fines
Use the gradation curve of material passing 63 mm for classification of fractions according to the criteria given in 'Major Divisions'
the method given
for fine-grained
Poorly graded gravels and
Fails to comply with soils.
GP gravel-sand mixtures, little or 0-5
COARSE GRAINED SOILS
GRAVELS coarse above
no fines, uniform gravels
(more than 20
half of Silty gravels, gravel-sand-silt Below 'A'
GM 12-50
mixtures (1) line or PI<4
coarse medium
fraction is Above 'A' line
Clayey gravels, gravel-sand
GC 12-50 and (2) Borderline
larger than 6 clay mixtures (1)
PI>7 classifications
2.36 mm) fine occur when the
Well graded sands and
2.36 Between 1 percentage of
SW gravelly sands, little or no 0-5 >6
and 3 fines (fraction
fines
SANDS smaller than
Poorly graded sands and
Fails to comply with 0.075 mm size)
(more than SP gravelly sands, little or no 0-5
coarse above is greater than
half of coarse fines
0.6 5% and less than
fraction is 12%. Borderline
Silty sands, sand silt mixtures Below 'A'
smaller than SM 12-50 classifications
(1) line or PI<4
2.36 mm) medium require the use
0.2 Above 'A' line of SP-SM,
Clayey sands, sand-clay
fine 0.075 SC 12-50 and GWGC.
mixtures (1)
PI>7
Inorganic silts, very fine
sands, rock flour, silty or
ML
(more than half of material less than 63 mm is smaller than 0.075 mm)
clayey fine sands or clayey
SILTS & CLAYS silts with slight plasticity
(Liquid Limit ≤50%)
Inorganic clays of low to
medium plasticity, gravelly
CL CI
clays, sandy clays, silty clays,
lean clays
FINE GRAINED SOILS
Organic silts and clays of low
OL
plasticity
Inorganic silts, mic- aceous
MH or diato-maceous fine sands
or silts, elastic silts
Inorganic clays of high
CH
SILTS & CLAYS plasticity, fat clays
(Liquid Limit >50%)
Organic silts and clays of high
OH
plasticity
HIGHLY ORGANIC Peat and other highly organic
PT
SOILS soils
Soil Moisture Condition: Is based on the appearance and feel of soil. Refer to AS 1726-1993, A2.5.
Page 19
Term Description
Cohesive soils; hard and friable or powdery, well dry of plastic limit.
Dry
Granular soils; cohesionless and free-running
Soil feels cool, darkened in colour.
Moist Cohesive soils can be moulded.
Granular soils tend to cohere.
Soil feels cool, darkened in colour.
Wet Cohesive soils usually weakened and free water forms on hands when handling.
Granular soils tend to cohere and free water forms on hands when handling.
Consistency of Cohesive Soils: May be estimated using simple field tests, or described in terms of a strength scale. In the field, the undrained shear
strength (su) can be assessed using a simple field tool appropriate for cohesive soils, in conjunction with the relevant calibration. Refer to AS 1726-1993,
Table A4.
Consistency - Essentially Cohesive Soils Soil Particle Sizes
SPT Undrained Unconfined
Shear Compressive
Term Field Guide Symbol “N” Term Size Range
Strength Strength
Value su (kPa) qu (kPa)
Oozes between fingers BOULDERS >200 mm
Very soft when squeezed in hand. VS 0-2 <12 <25 COBBLES 63-200 mm
Coarse GRAVEL 20-63 mm
Easily moulded with
Soft fingers. S 2-4 12-25 25-50 Medium GRAVEL 6-20 mm
Fine GRAVEL 2.36-6 mm
Can be moulded by strong Coarse SAND 0.6-2.36 mm
Firm pressure of fingers. F 4-8 25-50 50-100 Medium SAND 0.2-0.6 mm
Fine SAND 0.075-0.2 mm
Stiff St 8-15 50-100 100-200 SILT 0.002-0.075 mm
CLAY <0.002 mm
Not possible to mould with
Very stiff fingers. VSt 15-30 100-200 200-400
Can be indented with
Hard difficulty by thumb nail. H >30 >200 >400
Note: SPT - N to qu correlation from Terzaghi and Peck, 1967. (General guide only).
Consistency of Non-Cohesive Soils: Is described in terms of the density index, as defined in AS 1289.0-2000. This can be assessed using a field tool
appropriate for non-cohesive soils, in conjunction with the relevant calibration. Refer to AS 1726-1993, Table A5; BS5930-1999, p117.
Consistency - Essentially Non-Cohesive Soils
Term Symbol SPT N Value Field Guide Density Index (%)
Very loose VL 0-4 Foot imprints readily 0-15
Loose L 4-10 Shovels Easily 15-35
Medium dense MD 10-30 Shovelling difficult 35-65
Dense D 30-50 Pick required 65-85
Very dense VD >50 Picking difficult 85-100
Standard Penetration Test (SPT): Refer to. AS 1289.6.3.1-2004. Example report formats for SPT results are shown below:
Test Report Penetration Resistance (N) Explanation / Comment
4, 7, 11 N=18 Full penetration; N is reported on engineering borehole log
18, 27, 32 N=59 Full penetration; N is reported on engineering borehole log
4, 18, 30/15 mm N is not reported 30 blows causes less than 100 mm penetration (3rd interval) – test discontinued
30/80 mm N is not reported 30 blows causes less than 100 mm penetration (1st interval) – test discontinued
rw N<1 Rod weight only causes full penetration
hw N<1 Hammer and rod weight only causes full penetration
hb N is not reported Hammer bouncing for 5 consecutive blows with no measurable penetration – test
discontinued
Page 20
Rock Descriptions
Refer to AS 1726-1993 (Appendix A3.3) for the description and classification of rock material composition, including:
(a) Rock type (Table A6, (a) and (b))
(b) Grain size
(c) Texture and fabric
(d) Colour (describe as per soil).
The condition of a rock material refers to its weathering characteristics, strength characteristics and rock mass properties. Refer to AS 17261993
(Appendix A3 Tables A8, A9 and A10).
Weathering Condition (Degree of Weathering):
The degree of weathering is a continuum from fresh rock to soil. Boundaries between weathering grades may be abrupt or gradational.
Rock Material Weathering Classification
Weathering Grade Symbol Definition
Soil-like material developed on extremely weathered rock; the mass structure and substance fabric are no
Residual Soil RS
longer evident; there is a large change in volume but the material has not been significantly transported.
Extremely Weathered Rock is weathered to such an extent that it has 'soil' properties, i.e. it either disintegrates or can be remoulded
XW
Rock in water, but substance fabric and rock structure still recognisable.
Strong discolouration is evident throughout the rock mass, often with significant change in the constituent
Highly Weathered Rock HW
minerals. The intact rock strength is generally much weaker than that of the fresh rock.
Moderately Weathered Modest discolouration is evident throughout the rock fabric, often with some change in the constituent minerals.
MW
Rock The intact rock strength is usually noticeably weaker than that of the fresh rock.
Slightly Weathered Rock SW Rock is slightly discoloured but shows little or no change of strength from fresh rock.
Fresh Rock FR Rock shows no sign of decomposition or staining.
Notes:
1. Minor variations within broader weathering grade zones will be noted on the engineering borehole logs.
2. Extremely weathered rock is described in terms of soil engineering properties.
3. Weathering may be pervasive throughout the rock mass, or may penetrate inwards from discontinuities to some extent.
4. The ‘Distinctly Weathered (DW)’ class as defined in AS 1726-1993 is divided to incorporate HW and MW in the above table. The symbol DW should
not be used.
Strength Condition (Intact Rock Strength):
Strength of Rock Material
(Based on Point Load Strength Index, corrected to 50 mm diameter – Is(50). Field guide used if no tests available. Refer to AS 4133.4.1-2007.
Point Load
Term Symbol Index (MPa) Field Guide to Strength
Is(50)
Extremely Low EL ≤0.03 Easily remoulded by hand to a material with soil properties.
Material crumbles under firm blows with sharp end of pick; can be peeled with knife; too hard
Very Low VL >0.03 ≤0.1
to cut a triaxial sample by hand. Pieces up to 3 cm thick can be broken by finger pressure.
Easily scored with a knife; indentations 1 mm to 3 mm show in the specimen with firm blows
of the pick point; has dull sound under hammer. A piece of core 150 mm long by 50 mm
Low L >0.1 ≤0.3
diameter may be broken by hand. Sharp edges of core may be friable and break during
handling.
Readily scored with a knife; a piece of core 150 mm long by 50 mm diameter can be broken
Medium M >0.3 ≤1.0
by hand with difficulty.
A piece of core 150 mm long by 50 mm diameter cannot be broken by hand but can be broken
High H >1 ≤3
by a pick with a single firm blow; rock rings under hammer.
Very High VH >3 ≤10 Hand specimen breaks with pick after more than one blow; rock rings under hammer.
Specimen requires many blows with geological pick to break through intact material; rock rings
Extremely High EH >10
under hammer.
Notes:
1. These terms refer to the strength of the rock material and not to the strength of the rock mass which may be considerably weaker due to the effect of
rock defects.
2. Anisotropy of rock material samples may affect the field assessment of strength.
Page 21
APPENDIX B Flood Study [OCR of page images] D Flood Study
Page 22
m STE ge) NOOSA COUNCIL finmdiREADY are you? www.floodready.gov.au Flood Information Certificate This certificate is issued in response to an information request for a property which is located within the geographical boundaries of Noosa Council. Applicants Name Applicants Address P O Box 3495 CALOUNDRA DC QLD 4551 Email Address Deborah Bryan [email protected] Issue Date Property Number Property Description 03 January 2020 151409 Lot 7 RP 858525 Address 292 Illoura PI Cooroibah Qid 4565 Our Reference Cer19/3632 Issuing Officer Monkeith Kadhum Your Reference GJN This certificate is issued in response to an enquiry for the above property: REGISTERED OWNER/S NAME: Mr CM Eaton DEFINED FLOOD LEVEL: Flood levels on the site range from 8.0m AHD to 9.0m AHD Refer to the attached PDF document DEFINED FLOOD EVENT: 1% AEP Under 2100 Climate Change Conditions SOURCE OF INFORMATION: Noosa River Flood Study 2016, WMA Water HIGHEST HISTORICAL FLOOD LEVEL: A flood level has not been recorded for this property LOCATION DESCRIPTION OF RECORDED HISTORICAL EVENT: A flood level has not been recorded for this property DATE OF HISTORICAL EVENT: A flood level has not been recorded for this property FREEBOARD: 0.3m APPLICABLE MINIMUM FLOOR LEVEL FOR HABITABLE ROOM / AREA: Required minimum floor levels on the site range from (8.0 +0.3) 8.30m AHD to (9.0 +0.3) 9.30m AHD Refer to the attached PDF document THIS CERTIFICATE IS VALID FOR 6 MONTHS FROM DATE OF ISSUE. Velocity note: The subject property is located in an active water flow area and the velocity of the water is approximately 0.8m/s for the 1% AEP Defined Flood Event. Attachment: [4] 000 Illoura Place (No 292) Cooroibah www.noosa.qid.gov.au PO Box 141 Tewantin Qld 4565 [email protected] T 07 5329 6500 ABN 97 969 214 121 Flood Information Certificate (FSCVv3-0809) Page 1 of 3 Document Set ID: 21033392 Version: 2, Version Date: 03/01/2020
Page 23
: COCO ge, NOOSA COUNCIL finadiREADY are you? www.floodready.gov.au CLIMATE CHANGE The advice provided in this certificate is based upon information relating to historically recorded flood events and future climate condition. The defined flood event incorporates an allowance for climate change for the 1% AEP at year 2100. Climate change projections include increased rainfall intensity, higher mean sea level and more extreme weather conditions (e.g. storm surge and tropical cyclones). NOTES FOR FLOOD INFORMATION 1. The absence of Highest Historical Flood Level information does not imply that the above property is not subject to flooding, simply that Council has no record of this property flooding. Applicants are encouraged to make their own local enquiries. 2. In accordance the self-assessable (detached) house code, the MINIMUM FLOOR LEVEL is calculated as whichever is greater of either: (a) 300mm freeboard added to the Defined Flood Level for the site; or (b) 500 mm freeboard added to the Highest Historical Flood Level appropriate to the site; or (c) If the property is intended for use as a Hospital, Aged Residential Care Facility or Emergency Services Facility then the Council should be contacted to determine this level. 3. Council advises that if stormwater drainage pipelines/easements exist on the property then no earthworks or building are permitted in the easement. 4. All buildings shall conform to the relevant Planning Scheme Code in The Noosa Plan. 5. Please be aware of the natural topography in your area. Water runoff which exceeds the capacity of the underground drainage system (if present) and which concentrates in surface depressions and gullies as it flows down a catchment can cause localised flooding and is not identified in this certificate. 6. _ Filling must not cause actionable nuisance in accordance with Queensland Urban Drainage Manual. 7. Council advises that if there are openings to basements these openings require a minimum level at least equal to the minimum floor level. 8. Please be aware that the reported flood information may vary in the future as new data becomes available. 9. Flood Hazard Maps within Council's planning scheme are indicative only and should not be relied upon as a guide to potential flooding. www.noosa.qid.gov.au [email protected] T 07 5329 6500 PO Box 141 Tewantin Qld 4565 ABN 97 969 214 121 Flood Information Certificate (FSCV3-0809) Page 2 of 3 Document Set ID: 21033392 Version: 2, Version Date: 03/01/2020
Page 24
ge) NOOSA COUNCIL DISCLAIMERS Flood information provided by Council should only be used as a guide to the extent of flooding on the property. This information may be inaccurate or incomplete and it is recommended that purchasers make their own local enquiries with regard to the flooding and drainage history of the site. NO LIABILITY IS ACCEPTED FOR THIS INFORMATION. The property information supplied does not represent the highest probable flood level that could occur on this property. A flood more severe than the level described above may occur, although such events would be extraordinary. The absence of flood information does not imply that the above property is not subject to flooding, simply that Council has no fimariREADY | are you? www.floodready.gov.au flood information for this property flooding. If there is a history of flooding or drainage issues, we recommend you seek professional advice on this matter. COUNCIL ACCEPTS NO RESPONSIBILITY FOR THE ACCURACY OF THIS INFORMATION GLOSSARY OF TERMS Term Definition The Australian Height Datum (AHD) is the reference level for defining reduced levels AHD adopted by the National Mapping Council of Australia. The level of 0.0 m AHD is approximately mean sea level. Defined Flood Level A water level derived through mathematical modelling of the Defined Flood Event. Terminology consistent with State Planning Policy (SPP, 2003) which states “Defined Flood Defined Flood Event Event is the flood event adopted by a local government for the management of development in a particular locality”. The Annual Exceedance Probability is the likelihood of occurrence of a flood or storm tide inundation event of a given size or larger in any one year, usually expressed as a percentage. For example, if an event has an AEP of 1%, it means that there is a 1% risk 1% AEP. (i.e. probability of 0.01 or a likelihood of 1 in 100) of this event occurring in any one year. A 1% AEP event should not be interpreted as only occurring once in 100 years. This flood event is also commonly called the 100 year ARI (Average Recurrence Interval) or Q100. Source of Information Is a reference to the document summarising the results of the anticipated flooding relevant to this location. Highest Historical Flood Level The highest flood water level from all historic events for which Council has records. Location Description of Recorded Historical Event A description of the site where the Highest Historical Flood Level was recorded. Date of Historical Event The date on which the Highest Historical Flood Level occurred. Minimum Floor Level The minimum floor level calculated in accordance with the Town Plan through the addition of the relevant freeboard to the Defined Flood Level and the Highest Historical Flood Level. Council requires that the higher of these two levels be used as the minimum floor level. A factor of safety usually expressed as a height above the adopted Defined Flood Level. A Freeboard freeboard tends to compensate for factors such as wave action and historical and modelling uncertainties. i ial situation: a livi i F I m, dini m, Habitable Room/Area In a residential situation: a living or working area, such as a lounge roo ining root rumpus room, kitchen, bedroom or workroom. Flood Regulation Line Where a ‘regulation line’ has been set by Council to define the limit to which development may encroach onto a floodplain, development is undertaken outside such ‘regulation line’. Rainfall Intensity The amount of rainfall occurring in a unit of time, usually expressed in millimetres/hour. Mean Sea Level A tidal datum; the arithmetic mean of hourly heights of the sea at the tidal station observed over a period of time (preferably 19 years). Source: BOM This is approximately 0.0 m AHD Storm Surge The elevation of water generated by a tropical cyclone above or below the normal astronomical tide. Tropical Cyclones A tropical cyclone is a low-pressure system which develops in the tropics and is sufficiently intense to produce sustained winds of at least 63 km/h or greater and gusts in excess of 90 km/h near the centre. www.noosa.qid.gov.au PO Box 141 Tewantin Qld 4565 Flood Information Certificate (FSCV3-0809) Document Set ID: 21033392 Version: 2, Version Date: 03/01/2020 T 07 5329 6500 ABN 97 969 214 121 [email protected] Page 3 of 3
Page 25
APPENDIX C
Operations and
Maintenance Guidelines
[OCR of page images]
Dill C
Operations and
Maintenance Guidelines
Page 26
Aerobic Operation & Maintenance Requirements
The following sections advise on operation and maintenance to be specifically directed to the
home owner / occupier and user of an on-site domestic waste-water system.
Advice to a Home Owner / Occupier on Use of the System
For the on-site waste-water system to work well, there are some good habits to encourage
and some bad habits to avoid:
a) In order to reduce sludge building up in the tank:
i. scrape all dishes to remove fats, grease, etc. before washing;
ii. keep all possible solids out of the system;
iii. don't use a garbage grinder unless the system has been specifically designed to
carry the extra load;
iv. don't put sanitary napkins and other hygiene products into the system;
v. the baffles or valves in the distribution system should be periodically checked
(monthly or seasonally).
b) In order to keep the bacteria working in the tank and in the land-application area:
i. use biodegradable soaps;
ii. use a low-phosphorus detergent;
iii. use a low-sodium detergent in dispersive soil areas;
iv. use detergents in the recommended quantities;
v. don't use powerful bleaches, whiteners, nappy soakers, spot removers and
disinfectants;
vi. don't put chemicals or paint down the drain.
c) Conservation of water will reduce the volume of effluent requiring disposal to the land-
application area, make it last longer and improve its performance. Conservation
measures include:
i. installation of water-conservation fittings;
ii. taking showers instead of baths;
iii. only washing clothes when there is a full load;
iv. only using the dishwasher when there is a full load.
d) Avoid overloading the system by spacing out water use as evenly as possible
e.g. Do not do all washing on one day. Do not run the washing machine and dishwasher
at the same time.
Advice on maintenance
The waste-water treatment unit will need to:
i. be de-sludged regularly and as advised by the manufacturer;
ii. be protected from vehicles;
iii. have any grease trap cleaned out regularly;
iv. have any outlet filter inspected and cleaned.
Page 27
a) The land application area needs protection as follows:
i. spray or irrigation areas are not play areas for children and access should be
restricted;
ii. any evapo-transpiration areas should be designed to deter pedestrian traffic;
iii. no vehicles or stock should be allowed on trenches or beds;
iv. deep rooting trees or shrubs should not be grown over absorption trenches or
pipes;
v. keep the surface water diversion drains upslope of and around the land application
area should be kept clean to reduce absorption of rainwater into trenches or beds;
vi. the baffles or valves in the distribution system should be periodically checked
(monthly or seasonally).
b) Irrigation areas should have their grass mowed and plants maintained to ensure that these
areas take-up nutrients with maximum efficiency.
c) Signs for spray irrigation areas should ensure that appropriate warning signs are always
visible to persons undertaking any activity near a spray irrigation area.
d) Check equipment and:
i. follow the manufacturer's instructions for maintaining and cleaning pumps, siphons
and septic tank filters;
ii. clean disc filters or filter screens on irrigation-dosing equipment periodically by
rinsing back into the primary waste-water treatment unit;
iii. flush drip irrigation lines periodically to scour out any accumulated sediment.
Advice on Operating Problems
Problems can occur with systems which have not been maintained and where irrigation areas
have become saturated or clogged. The warning signs are obvious:
a) Irrigation area is wet or soggy with waste-water ponding on the surface of the ground.
b) There is a smell of "sewage" near the treatment plant or absorption area.
c) The drains and toilets run slowly.
d) The grease trap is full or blocked.
Advice on the Consequence of Failure
A failed treatment plant and land application system is a serious health and environmental
hazard and can lead to:
a) Spread of infectious diseases.
b) Breeding of mosquitoes and attraction of flies and rodents.
c) Nuisance and unpleasantness.
d) Pollution and infection of waterways, beaches, streams and shellfish beds.
e) Contamination of bores, wells and groundwater.
f) Alteration of the local ecology.
Advice on Home-owner / Occupier Responsibilities
Home-owners and occupiers are legally responsible to keep their on-site waste-water system
in good working order. If any of the above warning signs are evident, the home-owner or
occupier must contact the manufacturer / installer or authorised plumber for further advice.
Page 28
PLATE 1 Site Plan [OCR of page images] 1 Site Plan
Page 29
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Page 30
PLATE 2 Test Locations/ Residence [OCR of page images] 1 Test Locations/ Residence
Page 31
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Page 32
PLATE 3 Test Locations/ Cottages [OCR of page images] 1 Test Locations/ Cottages
Page 33
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Page 34
PLATE 4 Effluent Layout/ Residence [OCR of page images] 1 Effluent Layout/ Residence
Page 35
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Page 36
PLATE 5
Effluent Layout/
Cottages
[OCR of page images]
THIS
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Cottages
Page 37
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Page 38
PLATE 6 Noosa Council's Flood Contour Overlay Plan [OCR of page images] TU6 Noosa Council's Flood Contour Overlay Plan
Page 39
_©_OpenStreetMap.contriby 20 40 (60 80m Noosa Shire Council does not warrant the accuracy of information in this publication and any person using or relying upon such information does so on the basis that Noosa Shire Council shall bear no responsibility or liability whatsoever for any errors, faults, defects or omissions in the information. 4/12/2019 1:2000
Page 40
PHOTOGRAPHS [OCR of page images] OTOGR
Page 41
Figure 1 Adjoining cottages (driveway)
Figure 2 Adjoining cottages/ northeast/ dam
Geotechnical Soils Pty Ltd
ABN: 15 895 975 485
Sunshine Coast, Queensland
Office: 0413 951 991
[email protected]
www.geotechnicalsoils.com.au
Page 42
Figure 3 Adjoining cottages area
Figure 4 North/ detached cottage
Geotechnical Soils Pty Ltd
ABN: 15 895 975 485
Sunshine Coast, Queensland
Office: 0413 951 991
[email protected]
www.geotechnicalsoils.com.au
Page 43
Figure 5 Detached Cottage
Figure 6 West/ main residence
Geotechnical Soils Pty Ltd
ABN: 15 895 975 485
Sunshine Coast, Queensland
Office: 0413 951 991
[email protected]
www.geotechnicalsoils.com.au
Page 44
Figure 7 North/ main residence
Figure 8 Northeast/ main residence
Geotechnical Soils Pty Ltd
ABN: 15 895 975 485
Sunshine Coast, Queensland
Office: 0413 951 991
[email protected]
www.geotechnicalsoils.com.au
Page 45
Figure 9 Main residence
Figure 10 Main residence
Geotechnical Soils Pty Ltd
ABN: 15 895 975 485
Sunshine Coast, Queensland
Office: 0413 951 991
[email protected]
www.geotechnicalsoils.com.au
Page 46
Figure 11 Main residence
Figure 12 Fill batter within 'adjoining cottages'
Geotechnical Soils Pty Ltd
ABN: 15 895 975 485
Sunshine Coast, Queensland
Office: 0413 951 991
[email protected]
www.geotechnicalsoils.com.au
Used in these records
1890 Effluent Disposal Review.pdfRelated documentApplication case desk ↗
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