Council archive · source document
3461EffluentDisposalRep · MCU14/0060
Attached to the e-mail MCU14/0060.01 - Change existing approval.
BSA Licence No.1018403
THE ONLY NAME IN SOILS UNIT 3/53 GATEWAY DR, NOOSAVILLE , 4566
Ph.0754740900/ Fax.0754740901/ email: [email protected]
JOB NUMBER 15/0583-2 EFFLUENT DISPOSAL REPORT
CLIENT GLENBRAE OPERATIONS.
SITE LOCATION EXISTING RESIDENCE/OFFICE & RV PARK,
154 HOLTS ROAD, COOROY.
REPORT DATE 28/07/15 (AMENDED)
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 - 2000
“On-site domestic-wastewater management”. The Qld Plumbing & Wastewater Code has been
used for reference purposes during the compiling of this report. This report has been amended
due to information stating the existing office is also an existing 1 bedroom residence.
This report relates exclusively to the existing residence/office & RV Park at 154 Holts Rd,
Cooroy. 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 existing RV park, which fronts a sealed road. The site has an existing
residence/office, buildings and an amenities block currently disposing of effluent via an
Advanced Secondary ASTP (Taylex ABS) with an unsuitable irrigation method.
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 currently a partial nursery area. The proposed effluent
disposal area falls at a slope of approximately 2% towards the north. Surface water drainage from
adjoining allotments will not traverse this site. Surface water from the tested area will drain
towards the north.
The weather conditions prior to testing were periods of moist conditions.
The site has a Dam approximately 160m downhill of the proposed effluent disposal area, while
there is a watercourse approximately 110m 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, brown, high plasticity SANDY CLAY. Underlying this is a
moist, grey, high plasticity SILTY CLAY.
Groundwater was not encountered during the field investigation.
Rock was not encountered during the field investigation.
RESERVE AREA
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Page 2
A 100% reserve effluent disposal area can be obtained on this allotment.
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 machine augered boreholes up to 2000mm
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 - 2000 “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/week) Setback
results)Ksat As per AS/NZS Distance
1547-2000
PT 1 0.08
PT 2 0.08
PT 3 0.09
Average 0.08 .02 10* 20 1m
*Minimum setback distance from a watercourse (when an Advanced Secondary ASTP is
recommended) required by Noosa Council Policy.
Determination of Soil Category (Table 4.1.1 of AS/NZS 1547:2000)
Soil Category Soil Texture Structure Indicative Indicative
BH1 Permeability Drainage class
(ksat)(m/day)
5 Light Clays Moderately 0.06 to 0.12 Poorly Drained
(00-1500mm) Structured
6 Medium to Moderately < 0.06 Very Poorly
(1500-2000mm) Heavy Clays Structured Drained
The Design Irrigation Rate of 20 mm/week 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 AS1547-2000) is encountered.
# A Minimum set-back distance of 50m is obtained.
# Permeability rates are within the required parameters.
# The site is located outside a catchment area.
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 15/0583-2 edrpage2
Page 3
6. RECOMMENDATIONS
The Design Irrigation Rate of 20mm/week be adopted.
The existing Advanced Secondary ASTP (Taylex ABS) is to be utilized, while the
downhill septic tank and pump well (near the Dam) is to be utilized also.
The existing irrigation method is to be disconnected.
The new disposal system be by, # A Fixed Surface Spray Irrigation System, as per
AS/NZS 1547:2000. Purple line is to be used from the Taylex ABS to the irrigation area.
The disposal area is to be fenced (minimum 1200mm high), to restrict human and
vehicular traffic.
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 the manufacturers
requirements.
The area shall be surrounded by a 150mm high earth mound or similar.
The spray irrigation system shall distribute the effluent evenly (via a K-Rain Valve)
within the designated area through coarse spray heads suitable for use with effluent, and
shall not produce aerosols. All ‘plumes’ shall be evenly distributed and fixed in place
with a height of approx. 0.3m and have a throw of no greater than 2.0m. It is estimated
that approximately 42 plumes would be required.
Non-return valves and flush-out valves should be installed on irrigation lines.
The disposal area should be rotary hoed to a depth of 200mm and gypsum added.
Evergreen plants/vegetation/turf shall be planted to maximize evapo-transpiration.
The disposal area required is 658m2.
A daily flow rate of 1880 litres/day (8 caravan sites/ 16 persons @ 100 litres per
person/per day, and the existing 1 bedroom residence/office (2 persons @ 140 litres per
person/per day) has been adopted with a Design Irrigation Rate of 20mm/week, using
Standard Water-reduction fixtures (Standard water-reduction fixtures include dual
flush 6/3 litre (minimum) water closet, shower-flow restrictors, aerator faucets, and a
water-conserving washing machine). These fixtures must be installed. This flow rate
will accommodate the existing 1 bedroom residence/office and the
8 x caravan sites using standard water-reduction fixtures only. A 100% reserve area (as
per site plan) is to be kept free of buildings and traffic.
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;
At least two signs stating “Recycled water- Do not drink” are to be erected on boundaries
. 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.
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.(some examples attached to this report).
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.
Yours Sincerely,
Michael S. Pinkney (Laboratory Manager) Report 15/0583-2 EDR-page3
Page 4
THE ONLY NAME IN SOILS
SOIL PROFILE REPORT
CLIENT: Glenbrae Operations AUTHORIZED Glenbrae Operations
BY:
PROJECT: 154 Holts Rd, DATE TESTED: 02/07/15
Cooroy. JOB NO: 15/0583-2
Drilling Method: Jacro 105 100mm Borehole
No: 1
Depth Description PENET. Comments
(blows per 100mm)
(mm)
1 2 3 4
0 SANDY CLAY (CH)- High plasticity,
brown, fine to medium sand, moist,
100 stiff.
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500 SILTY CLAY (CH)- High plasticity,
pale grey, moist, stiff.
1600
1700
1800
1900
2000 Hole Terminated.
2100
2200
2300
2400
2500
Borelogging in accordance with AS1726-1993 Site Investigation Code
15/0583-2-edr Page 4
Page 5
THE ONLY NAME IN SOILS
SOIL PROFILE REPORT
CLIENT: Glenbrae Operations AUTHORIZED Glenbrae Operations
BY:
PROJECT: 154 Holts Rd, DATE TESTED: 02/07/15
Cooroy. JOB NO: 15/0583-2
Drilling Method: Jacro 105 100mm Borehole
No: 2
Description PENET. Comments
Depth (blows per 100mm)
(mm)
1 2 3 4
0 SANDY CLAY (CH)- High plasticity,
brown, fine to medium sand, moist,
100 stiff.
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500 SILTY CLAY (CH)- High plasticity,
pale grey, moist, stiff.
1600
1700
1800
1900
2000 Hole Terminated.
2100
2200
2300
2400
2500
Borelogging in accordance with AS1726-1993 Site Investigation Code
15/0583-2-edr Page 5
Page 6
THE ONLY NAME IN SOILS
SOIL PROFILE REPORT
CLIENT: Glenbrae Operations AUTHORIZED Glenbrae Operations
BY:
PROJECT: 154 Holts Rd, DATE TESTED: 02/07/15
Cooroy. JOB NO: 15/0583-2
Drilling Method: Jacro 105 100mm Borehole
No: 3
Description PENET. Comments
Depth (blows per 100mm)
(mm)
1 2 3 4
0 SANDY CLAY (CH)- High plasticity,
brown, fine to medium sand, moist,
100 stiff.
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500 SILTY CLAY (CH)- High plasticity,
pale grey, moist, stiff.
1600
1700
1800
1900
2000 Hole Terminated.
2100
2200
2300
2400
2500
Borelogging in accordance with AS1726-1993 Site Investigation Code
15/0583-2-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.
15/0583-2-edr Page 7
Page 8
Surface Irrigation system (sprays)
Plant Surface
4m 0.3m plumes
Ground Level
Heavy droplet
(Plumes e.g 10mm
feeder lines)
25mm diameter poly lines laid beneath surface.
150mm high mound surround
Rotary-hoe to a depth of 200mm and add gypsum
Plumes (side view)
150mm High earth mound to surround area
Typical Plan Layout of Manifold and Laterals for an
Irrigation Area of 658m2
Fence to surround area
2m
4m
25mm dia poly lines
4m
To Taylex
ABS
4m
2m 4m
6 port K-Rain
Valve 28m Plant out or turf surface 4m
4m
4m
Land Slope
Plumes
23.5m
Flush-out valves
Page 9
Page 10
Job No: 15/0583-2 Date Tested: 02/07/15 Site : 154 Holts Rd, Cooroy Client : Glenbrae Operations NOT TO SCALE
Utilize existing Amenities Block
Taylex ABS
Proposed Surface Irrigation Area-
658m2 (To be rotary hoed to a depth of
200mm with gypsum added, to be
planted out, bordered with a 150mm
high earth mound, and fenced)
Utilize existing Septic
Tank and Pump Well
BH3
BH3
10m
Toilet
2% Slope PT3
4m
BH2
PT1
4m
BH1
23.5m
K-Rain Valve
PT2
(To be installed)
28m
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