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Attachment D - Effluent disposal report
QBCC Licence No.1018403
THE ONLY NAME IN SOILS UNIT 3/53 GATEWAY DR, NOOSAVILLE , 4566
Ph.0754740900/ email: [email protected]
JOB NUMBER 20/1453 EFFLUENT DISPOSAL REPORT
CLIENT THE SHED HOUSE.
SITE LOCATION PROPOSED RESIDENCE,
268 KINMOND CREEK ROAD, COOTHARABA.
REPORT DATE 04/02/21
1. INTRODUCTION
The purpose of this report is to evaluate and define a suitable on-site sewerage treatment and
disposal system for household effluents in accordance with Australian Standard 1547 - 2012
“On-site domestic-wastewater management”. The Qld Plumbing & Wastewater Code-2019 has
been used for reference purposes during the compiling of this report.
This report relates exclusively to the proposed residence at 268 Kinmond Creek Rd,
Cootharaba. This document has been prepared for the express purpose stated above. This
document does not cover any other elements related to construction on the site.
2. SITE DESCRIPTION AND WEATHER CONDITIONS
The site is an acreage allotment, which fronts a sealed road.
The slope configuration in relation to surface drainage is linear planar.
The soil surface condition was moist at the time of testing. There was no evidence of cracking
of the surface during the investigation.
The site has no visible rock outcrops on the surface of the allotment.
The proposed effluent disposal area is exposed to sun and wind.
The proposed effluent disposal area is sparsely grassed, with scattered undergrowth, and has
many large sized mature trees present. The proposed effluent disposal area falls at a slope of
approximately 4% towards the south. Surface water drainage from adjoining allotments will not
traverse this site. Surface water from the tested area will drain towards the south.
The weather conditions prior to testing were periods of moist conditions.
The site has a Creek approximately 50m downhill of the proposed effluent disposal area.
3. SOIL PROFILE
The borelogs carried out at the site, refer attached Site Plan for localities, indicate that the soil
profile typically consists of a moist, grey, fine to coarse grained SILTY SAND. Underlying this
is a moist, pale brown, medium plasticity SANDY CLAY.
Groundwater was not encountered during the field investigation.
Rock was not encountered during the field investigation.
RESERVE AREA
A 100% reserve effluent disposal area can be obtained on this allotment.
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Page 2
Whilst every effort has been made to ensure that the borelogs carried out at the subject allotment
are indicative of the soil profile over the site any discrepancy between the profile detailed in the
borelogs and that observed during construction shall be referred to Global Testing for
immediate attention.
4. INVESTIGATION DETAILS
The investigation carried out at the site included hand augered boreholes up to 1500mm depth
and a series of three permeability test pits located as shown on the attached site report. All
testing carried out was in accordance with Australian Standard 1547 - 2012 “On-site domestic-
wastewater management”.
5. TEST RESULTS AND CONCLUSIONS (TABLE A1)
Test No. Soil Slope Setback Recommended Beavers
Permeability (m/m) Distance Design Irrigation Gardner
(based on test (m) Rate (mm/day) Setback
results)Ksat As per AS/NZS Distance
1547-2012
PT 1 0.64
PT 2 0.57
PT 3 0.57
Average 0.59 .04 10* 4 6m
*Minimum setback distance from a watercourse (when an Advanced Secondary ASTP is
recommended) required by Noosa Council Policy.
Determination of Soil Category (Table 5.1 of AS/NZS 1547:2012)
Soil Category Soil Texture Structure Indicative Indicative
BH3 Permeability Drainage class
(ksat)(m/day)
3 Loams Weakly 0.5 to 1.5 Well Drained
(0-500mm) Structured
5 Light Clays Moderately 0.06 to 0.12 Poorly Drained
(500-1500mm) Structured
The Design Irrigation Rate of 4mm/day was adopted from the above results in Table A1.
Noosa Council’s policy suggests that the use of a primary treated effluent disposal system
will be satisfactory provided ;
# Sufficient permeable surface soil overlying rock is present over the disposal area, not
less than 1.2metres depth.
# A suitable soil category material (as per AS1547-2012) is encountered.
# A Minimum set-back distance of 50m is obtained.
# Permeability rates are within the required parameters.
Not all the above requirements have been met, therefore it is concluded that the use of a
primary treated effluent disposal system is not acceptable.
Report 20/1453 edr page2
Page 3
6. RECOMMENDATIONS
The Design Irrigation Rate of 4mm/day be adopted.
The site be provided with an “Aerated wastewater-treatment system” capable of
producing Advanced secondary effluent, or an equivalent system, to councils approval
in lieu of a septic tank.
The disposal system be by, # A Covered surface drip irrigation system consisting of
‘Wasteflow or Netafim’ Pressure-Compensating Drippers, as per AS/NZS
1547:2012.
Purple line is to be used from the ASTP to the irrigation area.
An in-line filter is to be installed between the Treatment Plant and the Irrigation System.
Regular maintenance of the Filter shall be undertaken, according to manufacturers
recommendation.
An 150mm high diversion bank/border shall be constructed around the irrigated
area.
The dripper system shall evenly distribute effluent to avoid clogging by soil or root
intrusion. Maximum spacing shall be 1000mm.
Non-return valves and flush-out valves should be installed on irrigation lines. The
minimum required amount of effluent to be pumped at regular intervals, should be such,
that all irrigation lines are full, and effluent delivered equally.
The Wasteflow/Netafim lines are to be placed on the surface, with a 150mm layer of
mulch placed over the irrigation lines. Existing evergreen plants are to be utilized to
maximize evapo-transpiration.
The disposal area required is 150m2.
A daily flow rate of 600 litres/day (5 persons @ 120 litres per person/per day) has been
adopted with a Design Irrigation Rate of 4mm/day. This flow rate will accommodate the
proposed 3 bedroom residence only.
The disposal area should be located in the vicinity of PT 1, PT 2 and PT 3 as per
attached site plan.
All set-back distances as required by the local authority shall be met;
. Stormwater run-off including roofwater from buildings shall be diverted around and away
from the disposal area. Imported fill may be required should there be insufficient soil
available for the design of the disposal system.
Certification
The local authority may request that an inspection and certification is undertaken on the installation
of the system when nearing completion. The installer must contact Noosa Council prior to ‘burying’
the system, if certification is required.
Please note: Personal Hygiene Products, Bleaches and detergents high in phosphorous will
damage the capabilities of the Treatment System’s performance. Information should be
sought by the Treatment System’s manufacturer for a guide of suitable products acceptable
for the system.
Yours Sincerely,
Michael S. Pinkney (Laboratory Manager)
Report 20/1453 EDR-page3
Page 4
THE ONLY NAME IN SOILS
SOIL PROFILE REPORT
CLIENT: The Shed House. AUTHORIZED The Shed House.
BY:
PROJECT: 268 Kinmond Ck Rd, DATE TESTED: 13/01/21
Cootharaba. JOB NO: 20/1453
Drilling Method: 100mm Hand Auger Borehole
No: 3
Depth Description PENET. Comments
(blows per
(mm) 100mm)
1 2 3 4
0 SILTY SAND (SM)- Fine to coarse,
grey, moist, loose.
100
200
300
400
500 SANDY CLAY (CI) – Medium
plasticity, pale brown, fine to coarse
grained sand, moist, stiff.
600
700
800
900
1000
1100
1200
1300
1400
1500 HOLE TERMINATED.
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
Borelogging in accordance with AS1726-1993 Site Investigation Code
20/1453 edr Page 4
Page 5
THE ONLY NAME IN SOILS
SOIL PROFILE REPORT
CLIENT: The Shed House. AUTHORIZED The Shed House.
BY:
PROJECT: 268 Kinmond Ck Rd, DATE TESTED: 13/01/21
Cootharaba. JOB NO: 20/1453
Drilling Method: 100mm Hand Auger Borehole
No: 4
Depth Description PENET. Comments
(blows per
(mm) 100mm)
1 2 3 4
0 SILTY SAND (SM)- Fine to coarse,
grey, moist, loose.
100
200
300
400
500 SANDY CLAY (CI) – Medium
plasticity, pale brown, fine to coarse
grained sand, moist, stiff.
600
700
800
900
1000
1100
1200
1300
1400
1500 HOLE TERMINATED.
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
Borelogging in accordance with AS1726-1993 Site Investigation Code
20/1453-edr Page 5
Page 6
THE ONLY NAME IN SOILS
SOIL PROFILE REPORT
CLIENT: The Shed House. AUTHORIZED The Shed House.
BY:
PROJECT: 268 Kinmond Ck Rd, DATE TESTED: 13/01/21
Cootharaba. JOB NO: 20/1453
Drilling Method: 100mm Hand Auger Borehole
No: 5
Depth Description PENET. Comments
(blows per
(mm) 100mm)
1 2 3 4
0 SILTY SAND (SM)- Fine to coarse,
grey, moist, loose.
100
200
300
400
500 SANDY CLAY (CI) – Medium
plasticity, pale brown, fine to coarse
grained sand, moist, stiff.
600
700
800
900
1000
1100
1200
1300
1400
1500 HOLE TERMINATED.
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
Borelogging in accordance with AS1726-1993 Site Investigation Code
20/1453-edr Page 6
Page 7
* DO NOT Allow newspapers, disposable or sanitary napkins, rubber products,
nappy liners, cotton buds etc. to enter the system.
* DO NOT Use an in-sink garbage grinder. These are not recommended by most
councils as they can add extra loading equivalent to about 2 persons.
* DO NOT Use strong caustics, acids, alkalis or chemical detergents. These can
damage the system and cause bad odours.
* DO NOT Use disinfectants or other bactericides.
* DO NOT Put grease/fats or food scraps down the kitchen sink i.e plates should be
scraped resonably clean prior to washing up.
* NEVER Dispose of used cooking oil or similar material down the sink.
20/1453 edr Page 7
Page 8
LIMITATIONS AND ADDITIONAL NOTES
1. A Site Classification Report may be requested by Certifiers or Local Council to aid in
approval of this report regarding articulation, if the site is suspected of being classified as H,
E or P in accordance with AS2870. Global Testing should be contacted to undertake this
testing (additional charge applies), if not previously requested. This Effluent Disposal
Report does not address articulation or flexible joints (an RPEQ should be sought if design
of either of these is required- additional charges apply).
2. If any future amendments are required due to the movement of the building footprint,
amount of bedrooms, on-site earthworks, or requests for an alternative area or alternative
system, an additional charge of $264 will apply to complete an updated Effluent Disposal
Report.
3. Global Testing has completed this report based on plans and information as supplied by the
client.
4. Any levels or slope measurements within this report are approximate only, and should not be
used for construction purposes.
20/1453-edr Page 8
Page 9
Covered Surface Drip Irrigation System
Utilize existing vegetation
150mm cover of mulch 1000mm max. Spacing
Ground Level
Netafim or Wasteflow Pressure Compensating Dripper Lines
Place on surface and cover with 150mm mulch.
150mm high mound surround
Diversion drain
or Cut off drain Irrigation lines
Slope greater than 15%
Typical Plan Layout of Manifold and Laterals for an
Netafim or Irrigation Area of 150m2
Wasteflow Pressure
Compensating Dripper
Lines
1m
To Advanced Secondary
ASTP
10m
Flush-out Valves
15m
Page 10
Page 11
Job No: 20/1453 Date Tested: 13/01/21 Site : 268 Kinmond Ck Rd, Cootharaba Client : The Shed House SCALE 1:1000
Proposed Covered Surface Irrigation Area -
150m2
(Utilize existing vegetation, mulch, border
and install)
(Wasteflow or Netafim Pressure-
Compensating Dripper Lines to be used)
15m 4%
Slope
BH3 10m
PT1
BH1 10m BH4
10m PT2
PN1
BH5
BH2 PT3
8% PN2
Slope
Proposed Advanced Secondary ASTP
(To be installed)