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Appendix D - On-site domestic wastewater evaluation report · MCU25/0022
PROJECT NO. 23/8894 24th JULY 2023
NORTH COAST GEOMECHANICAL CONSULTANTS
1/36 Maud Street
MAROOCHYDORE QLD 4558
Phone 07 5443 2988
Fax 07 5443 5157
Email: [email protected]
ON-SITE DOMESTIC WASTEWATER
EVALUATION REPORT
PROPOSED RESIDENCE AT
193 SANKEYS ROAD,
FEDERAL
FOR LACHLAN ROBINS
TESTING AUTHORITY: CIVIL QUALITY ASSURANCE PTY. LTD.
P.O. BOX 1225, NAMBOUR, QLD. 4560
8894-193 SANKEYS RD-FEDERAL Page 1 of 13 24/07/2023
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Page 2
PROJECT NO. 23/8894 24th JULY 2023
1.0 INTRODUCTION: The Site Inspection and Field Testing to determine soil types
and characteristics were carried out by Civil Quality Assurance Pty.Ltd.
This report refers to their findings and results to determine a suitable method and size
of domestic wastewater application area from a proposed 4-bedroom residential
dwelling.
2.0 SITE: The allotment is situated off the western side of Sankeys Road, FEDERAL.
It is a large heavily timbered allotment described as Lot.6 RP216727 with an area of
6.041 hectares. Refer locality on front cover of this report. A wastewater application
area was selected on the northern western side of the proposed building site.
The area’s natural land surface falls to the south west at about 18%. The area is
heavily treed bushland and well grassed.
Testing was carried out over the proposed wastewater disposal area to determine soil
types and characteristics of the existing soils for the purpose of on-site domestic
wastewater disposal. Soil Classifications and Descriptions were carried out in
accordance with A.S. 1547:2012 “On-Site Domestic Wastewater Management” and
the “On-Site Sewerage Code” published by The Department of Natural Resources.
Test Locations are shown on the attached Site Plan.
3.0 SUB-SURFACE INVESTIGATIONS: Boreholes carried out revealed silty clay
surface soils of medium to high plasticity overlaying shallow highly weathered
shaley siltstone. Soils classified in accordance with Table 5.1 of A.S. 1547:2012
were given a general Soil Category 5 (Massive Structure). Borelogs showing the soil
profile are attached.
Percolation Testing measures the soil’s water absorption capabilities. The testing
was carried out in accordance with A.S. 1547:2012, Appendix G, using 100mm
diameter test holes to a depth of 450mm. The tests were carried out in several
positions on the site and the results are shown on the attached Desktop Analysis.
8894-193 SANKEYS RD-FEDERAL Page 2 of 13 24/07/2023
Page 3
PROJECT NO. 23/8894 24th JULY 2023
4.0 HYDRAULIC FLOWS AND RECOMMENDED DISPOSAL SYSTEMS:
Calculations in accordance with Appendix 4.2D of A.S.1547:2012, using the
proposed 4-bedroom residence, supplied by on site storage tank water supply as
having 6 equivalent person occupancy rating. A typical wastewater flow design
allowance from Table H1 of AS1547 of 120 litres/person per day was used to
calculate a daily effluent sullage flow figure of 720 litres per day or 5,040 litres per
week using standard water fixtures.
We recommend the use of Standard Water Reduction Fixtures. These fixtures should
include: - a) Dual Flush 11 litre/5.5 litre WC's.
b) Shower Flow Restrictors.
c) Aerator Faucets.
d) Water Conserving Washing Machines.
Due to the poorly-draining Category 5 silty soils and the presence of a shallow
weathered siltstone, the steep slope and the close proximity of nearby gully
(watercourse),, we recommend all domestic effluent be treated to a minimum
Secondary Quality as described in Clause 11.8.4 of the “On-Site Sewerage Code”
and discharged into a shallow sub-surface irrigation area, utilizing the
evapotranspiration effects of the surface soils, plants, the sun and wind. Treatment
shall be by On-Site Treatment Plant with model or type specification approval,
installed, operated and maintained in accordance with the conditions of model or type
specification approval. Many approved Secondary treatment wastewater systems are
available these days and their particular irrigation methods may vary slightly.
We recommend a suitable wastewater land application area could be a Shallow Sub-
Surface Irrigation area consisting of rows of shallow buried geofabric wrapped
seepage pipes along the contour surrounded by 10-15mm gravel connected by
manifold and turf valves from the treatment tank. Each shallow pipe should have its
own isolation valve and cleanout end capping.
8894-193 SANKEYS RD-FEDERAL Page 3 of 13 24/07/2023
Page 4
PROJECT NO. 23/8894 24th JULY 2023
4.0 HYDRAULIC FLOWS AND RECOMMENDED DISPOSAL SYSTEMS
(Cont.):
Calculations of wastewater loadings have resulted in a minimum area of 240m2 of
Disposal Area required for the residence proposed. An indicative area has been
shown on the Site Plan.
Setback distances are calculated to prevent any viruses present within sewage
effluent travelling through the soil, contaminating areas that may come in contact
with human habitation and into streams.
The “On-Site Sewerage Code” by the Department of Natural Resources recommends
a minimum setback to any watercourse or dam for the location of Secondary Treated
Wastewater Application Areas are to be a minimum of 30 metres.
All surface water and seepage water up slope of the disposal area shall be diverted
around the area. All disposal areas shall be setback a minimum 4.0 metres from
boundaries on the downhill side, and 2.0 metres from all other boundaries. Buildings
shall be a minimum of 15.0 metres from the wastewater application area.
Grass cover and vegetation should be maintained around the area as well as good
sunlight exposure to maximise evapotranspiration.
To ensure optimum performance of disposal areas, adequate maintenance of systems
is essential. They should be installed by approved and licensed plumbers and
maintained at regular scheduled intervals.
5.0 SUMMARY: The Treatment System and Land Application Area is considered
suitable for proposed domestic On-Site Effluent Disposal provided the setback
guidelines set out in this report are followed.
Should the client have any queries in relation to the information contained in this
report, this office should be contacted.
K.N. CROCKER (M.I.E. AUST. R.P.E.Q. NO. 638)
8894-193 SANKEYS RD-FEDERAL Page 4 of 13 24/07/2023
Page 5
SITE PLAN
TEST LOCATIONS
193 SANKEYS ROAD, FEDERAL
NORTH
SANKEYS ROAD
ESS
ACC
BH2
P1
BH3
BH1 P2
Cut Bank
BH4
NT
ME
SE
EA
S S
CE
AC
10
m
193
TP3
TP2
0m
240m2
24
INDICATIVE
DISPOSAL Heavily
Treed
AREA
TP1
Existing Gully
Approximately 45m
8894-193 SANKEYS RD-FEDERAL Page 5 of 13 24/07/2023
Page 6
Civil Quality Assurance T/A _ ABN 21 613397934 Civil Quality Assurance Pty Ltd P.O. Box 1225, Nambour Qld 4560 For all Civil Testing PH 0429 674334 Servicing South East Queensland Project:__ 193 Sankeys Rd Requested By:__L.Robins Federal Date Tested:__30-6-23 Client: _ Lachlan Robins Report No.:__A191 Drilling Method: Log of cutting Bore Hole No.:1 Depth Description Comment Mm 00 Silty CLAY, medium to high plasticity, brown, some fine gravel/sand and some organics present, moist, soft to firm (CI-CH) 300 SHALE STONE, fractured, light red/brown, quartz present, moist, weak 1500 Hole Terminated Tests and sampling results relate only to the items tested or sampled. results applies to the sample received/( abnormalities may contribute to the report being compromised) Reports shall not be reproduced except in full 6 Mill Lane Nambour CQA Laboratory ABN 21 61339 7934 Form R26 July 2021 8894-193 SANKEYS RD-FEDERAL Approved Person: Page 6 of 13 C. Templeton Date: 10-7-23 24/07/2023
Page 7
Civil Quality Assurance T/A _ ABN 21 613397934 Civil Quality Assurance Pty Ltd PH 0429 674334 Project:__193 Sankeys Rd Federal Client: __ Lachlan Robins P.O. Box 1225, Nambour Qld 4560 For all Civil Testing Servicing South East Queensland Requested By:__L.Robins Date Tested:__30-6-23 Report No.:__A191 Drilling Method: Hand Augured bore hole Bore Hole No.:2 Depth Description Comment Mm 00 Silty CLAY, medium to high plasticity, brown, some fine gravel/sand and organics present, 300 500 moist, soft to firm (CI-CH) SHALE STONE, fractured, light red/brown, quartz present, moist, weak Hole Terminated in shale stone ‘Tests and sampling results relate only to the items tested or sampled. results applies to the sample received/( abnormalities may contribute to the report being compromised) Reports shall not be reproduced except in full 6 Mill Lane Nambour CQA Laboratory ABN 21 61339 7934 Form R26 July 2021 8894-193 SANKEYS RD-FEDERAL jes Approved Person: ec of C. Templeton Date: 10-7-23 Page 7 of 13 24/07/2023
Page 8
Civil Quality Assurance T/A _ ABN 21 613397934 P.O. Box 1225, Nambour Qld 4560 Civil Quality Assurance Pty Ltd For all Civil Testing PH 0429 674334 Servicing South East Queensland Project:__193 Sankeys Rd Requested By:__L.Robins Federal Date Tested:__30-6-23 Client: __ Lachlan Robins Report No.:__A191 Drilling Method: Hand Augured bore hole Bore Hole No.:3 Depth Description Comment Mm 00 Silty CLAY, medium to high plasticity, brown, some fine gravel/sand and organics present, moist, soft to firm (CI-CH) 400 SHALE STONE, fractured, light red/brown, quartz present, moist, weak 500 Hole Terminated in shale stone Tests and sampling results relate only to the items tested or sampled. results applies to the sample received/( abnormalities may contribute to the report being compromised) Reports shall not be reproduced except in full > FT Approved Person: Gurl 6 Mill Lane Nambour C. Templeton CQA Laboratory ABN 21 61339 7934 Date: 10-7-23 Form R26 July 2021 8894-193 SANKEYS RD-FEDERAL Page 8 of 13 24/07/2023
Page 9
Civil Quality Assurance T/A ABN 21 613397934 P.O. Box 1225, Nambour Qld 4560 Civil Quality Assurance Pty Ltd For all Civil Testing PH 0429 674334 Servicing South East Queensland Project:__193 Sankeys Rd Requested By:__L.Robins Federal Date Tested:__30-6-23 Client: __Lachlan Robins Report No.:__A191 Drilling Method: Hand Augured bore hole Bore Hole No.:4 Depth Description Comment Mm 00 Silty CLAY, medium to high plasticity, brown, some fine gravel/sand and organics present, moist, soft to firm (CI-CH) 500 SHALE STONE, fractured, light red/brown, quartz present, moist, weak 600 Hole Terminated in shale stone Tests and sampling results relate only to the items tested or sampled. results applies to the sample received/( abnormalities may contribute to the report being compromised) Reports shall not be reproduced except in full " me " ° . Approved Person: Ce Em 6 Mill Lane Nambour C. Templeton CQA Laboratory ABN 21 61339 7934 Date: 10-7-23 Form R26 July 2021 8894-193 SANKEYS RD-FEDERAL Page 9 of 13 24/07/2023
Page 10
ABN 21 613397934 Ph. 0429674334 Project:_193 Sankeys Rd P.O. Box 1225, Nambour Qld 4560 For all Civil Testing Servicing South East Queensland TEST REPORT Requested By:_L. Robins Federal Date Tested: _30-6-23 Client: _Lachlan Robins Report No. A191 Field Test Procedure: AS/NZ 1547:2000 Sample method: Hand Auger Bore Hole Hole Number: TP1 TP2 TP3 Radius of all holes(mm): 100 100 100 Depth of Holes(mm): 600 600 600 Impermeable Layer: n/a n/a n/a Depth of water in Hole(mm): 250 250 250 Site Vegetation: Heavily treed with small shrubs Soil Moisture: moist moist moist What is the water table: n/a n/a n/a Soil Classification see Bhl Permeameter readings(mm/Hr): 25 25 aa Permeameter Diameter: 150mm 6 Mill Lane Nambour Form 4A September 2016 8894-193 SANKEYS RD-FEDERAL Signatory: C. / — C. Templeton & Date: 10-7-23 Page 10 of 13 24/07/2023
Page 11
NORTH COAST GEOMECHANICAL CONSULTANTS
CONSULTING ENGINEERS 1/36 Maud Street
K.N. CROCKER, Dip. C.E. MIE.Aust MAROOCHYDORE QLD 4558
CPEng. No. 86019 Phone 07 5443 2988
RPEQ No. 638 Fax 07 5443 5157
LGEQ No. 544 Email: [email protected]
DESKTOP ANALYSIS
RESIDENCE AT 193 SANKEYS ROAD, FEDERAL
Lot. 6 RP216727
SOIL PERMEABILITY/SOIL CONDUCTIVITY TEST CALCULATION
AS/NZS 1547:2012
Q = RATE OF LOSS OF WATER FROM RESERVOIR (m³/min)
H = DEPTH OF WATER IN TEST HOLE (cm) r = RADIUS OF TEST HOLE (cm)
Ksat = SATURATED HYDRAULIC CONDUCTIVITY OF SOIL IN m/day
HYDRAULIC LOADING FOR 4-BEDROOM RESIDENCE.
6 EQ. PERSONS @ 120 L/day/person = 720 L / Day
5040 L / Week
Based on AS1547, Table H1, On-Site Roof Water Supply
Ksat = 4.4Q[0.5 sinh-1(H/2r)-√{(r/H²)+0.25}+r/H]
2πH²
TEST FALL Q H R Ksat SOIL
STRUCTURE
HOLE (mm/5min) (cm³/min) (cm) (cm) (m/day) CATEGORY
1 2.10 7.422 25 5 0.062 5 Massive
2 2.10 7.422 25 5 0.062 5 Massive
3 2.10 7.422 25 5 0.062 5 Massive
SUMMARY OF PERCOLATION TEST HOLES
In Accordance with A.S.1547:2012 "On-Site Domestic Wastewater Management
IRRIGATION
PRIMARY SECONDARY SECONDARY
TEST RESULTS
TREATED TREATED TREATED
mm/day
HOLE Ksat. DLR DLR DIR
1 0.06 n.a. 5 3
2 0.06 n.a. 5 3
3 0.06 n.a. 5 3
Minimum
Area Required: 240 metres2
DLR = DESIGN LOAD RATE FROM TABLE 5.2 AS1547:2012
in mm/day, based on SECONDARY TREATED EFFLUENT.
DIR = DESIGN IRRIGATION RATE FROM TABLE M1 AS1547:2012 in mm/day.
SECONDARY TREATED EFFLUENT ONLY PERMITTED.
TRENCH LENGTH = N/A
SOIL CAT. = SOIL CATEGORY DETERMINED FROM BORELOGS
(REFER TABLE 5.1 AS1547:2012)
N.R. = NOT RECOMMENDED
8894-193 SANKEYS RD-FEDERAL Page 11 of 13 24/07/2023
Page 12
240m2 Su
Dive rface W
rsio ate
nM r
oun
d
24m
10m
fall
8894-193 SANKEYS RD-FEDERAL Page 12 of 13 24/07/2023
Page 13
SUITABLE PLANT SPECIES FOR OF LAND APPLICATION AREAS
GENUS SPECIES COMMON NAME
Grasses
Buffalo
Kikuyu
Ground Cover
Acanthus mollis
Crinum pedunculatum
Hardenbergia
Hibbertia scandens
Lonandra longifolia
Pennisetum alopecuroides Swamp Foxtail
Ophiopogon
Viola hederacea Native Violet
Shrubs
Baeckea stenophylla Weeping Baeckea
Baeckea vigata
Banksia robur Broad Leaved Banksia
Callistemon pachyphyllus Wallum Bottlebrush
Comesperma defoliatum
Leptospermum juniperinum
Leptospermum laevigatum
Leptospermum liversidgei
Leptospermum semibaccatum
Melastoma affine Blue Tongue
Pultenaea paleacea
THESE SPECIES ARE NOT SUITABLE WITHIN TEN METRES
OF DISPOSAL AREA
Banksia integrifolia
Callistemon viminalis
Callistemon salignus
Casuarina cunninghamiana
Casuarina glauca Swamp Sheoak
Eucalyptus intermedia Red Bloodwood
Eucalyptus microcorys Tallowood
Eucalyptus robusta Swamp Mahogany
Glochidion ferdinandii Cheese Tree
Leptospermum petersonii
Lophostemon suaveolens
Melaleuca armillaris
Melaleuca leucadendra
Melaleuca quinquenervia Paperbarked Tea Tree
To Flush Isn’t the End of the Line 2
8894-193 SANKEYS RD-FEDERAL Page 13 of 13 24/07/2023
Used in these records
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