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REF: 3995WW
VERSION [1.0]
OCTOBER 16, 2020
SOIL & SITE ASSESSMENT FOR ONSITE
WASTEWATER DISPOSAL
65 RAPLEYS LOOP ROAD, WEROMBI NSW
LGA: Wollondilly
Lot 5 DP 868790
CLIENT: Belle Lifestyle Australia Pty
HARRIS ENVIRONMENTAL CONSULTING
PO BOX 70, JAMBEROO, 2533, NSW
TEL: (02) 4236 0954
Info@harrisenvironmental.com.au
SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW
VERSION CONTROL
Title Soil & Site Assessment for Onsite Wastewater Disposal
Site address 65 Rapleys Loop Road, Werombi NSW
Description Proposed AWTS and surface irrigation for existing dwelling and
proposed granny flat
Created By Pichamon Sarakan B.Env Engineering (UOW)
Approved by: Sean Harris Msc Env Science (UOW), Grad dip Nat Res (UNE), BscAppSc,
Agriculture (HAC)
Date Created 16/10/2020
Version Modified Modifications Made Date Status
Number By Modified
[1.0] P.S. Issue for client review 16/10/2020 Complete
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SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW
TABLE OF CONTENTS
1. INTRODUCTION ............................................................................................................. 4
2. SITE INFORMATION ....................................................................................................... 6
3. SITE ASSESSMENT ....................................................................................................... 6
4. SOIL ASSESSMENT ....................................................................................................... 7
5. SUMMARY OF SOIL AND SITE CONSTRAINTS ........................................................... 8
6. SYSTEM DESIGN ......................................................................................................... 10
6.1 Wastewater Treatment System............................................................................... 10
6.2 Pipes....................................................................................................................... 10
7. REQUIRED IRRIGATION AREA.................................................................................... 12
8. LOCATION AND METHOD OF IRRIGATION ............................................................... 12
9. SUMMARY .................................................................................................................... 13
10. REFERENCES ........................................................................................................... 14
FIGURES
Figure 1 Location ......................................................................................................... 4
Figure 2 Proposed Development ................................................................................. 5
TABLES
Table 1 Minimum pipe diameter and grade calculations ......................................... 11
Table 2 Minimum pipe depth for trafficable areas .................................................... 11
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SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW
APPENDICES
Appendix i Semi Fixed Spray Irrigation ......................................................................... 15
Appendix ii General recommendations to manage water quality and quantity............... 17
Appendix iii Required buffers .......................................................................................... 18
Appendix iv Standard Drawing 9A - Upslope Diversion Drain......................................... 19
Appendix v Water Balance ............................................................................................. 20
Appendix vi Nitrogen Balance ......................................................................................... 21
Appendix vii Phosphorus Balance.................................................................................... 22
Appendix viii Site Plan- Sheet 1 ........................................................................................ 23
Appendix ix Site Plan- Sheet 2 ........................................................................................ 24
Appendix x Surface Irrigation Standard Drawing............................................................ 25
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SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW
1. INTRODUCTION
This Site and Soil Assessment for On-site Wastewater was prepared by Harris Environmental
Consulting at the request of Belle Lifestyle Australia Pty. It relates to a proposed 2-bedroom
granny flat to be constructed adjacent to the existing 4-bedroom residence. The existing
AWTS servicing the 4-bedroom residence has sufficient capacity for the additional
wastewater from the granny flat. A new spray irrigation area is proposed in this report.
Fieldwork was undertaken by a representative of Harris Environmental Consulting (HEC) on
13th September 2020. This plan is based on the primary investigation of the soils, topography
and hydrology of the site observed on the day of inspection. Soil samples and photos of the
site were taken for further analysis.
This Soil and Site Assessment for On-Site Wastewater Management has been prepared in
accordance with:
Wollondilly Shire Council’s DCP for On-Site Sewage Management and Greywater
Re-Use, (May 2011). Compliant with Category 1 as more than 1500m2 is available
for effluent disposal
Local Government Act 1993;
Australian Standard AS/NZS 3500 Plumbing and Drainage 2018;
Environment and Health Protection Guidelines (1998) On-site Sewage Management;
for Single Households (Department of Local Government);
AS/NZ 1547:2012 On-site wastewater management (Standards Australia, 2012).
FIGURE 1 LOCATION
Source: Sixmaps
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SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW
FIGURE 2 PROPOSED DEVELOPMENT
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SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW
2. SITE INFORMATION
Owner: Belle Lifestyle Australia Pty
Project Manager Rachel Bryan
Bell Home Australia
46473880
Site address: 65 Rapleys Loop Road, Werombi NSW
Legal title: Lot 5 DP 868790
Local Government: Wollondilly Council
Size of property: Approx. 5.1ha
Water supply: Tank
Wastewater design load and No. of bedrooms in the 800L/d
daily wastewater (L/day): existing dwelling
2-bedroom granny flat 400L/d
Wastewater volume as per
WaterNSW(2019) Total wastewater load 1200L/day
Existing wastewater treatment: AWTS
Proposed wastewater disposal: Spray irrigation
Date site assessed: 13 October, 2020
Date report prepared: October 16, 2020
Report prepared by Pichamon Sarakan B.Env Engineering (UOW)
Site assessor:
Msc Env Science (UOW), Grad dip Nat Res (UNE),
BscAppSc, Agriculture (HAC)
Sean Harris
3. SITE ASSESSMENT
Climate - rainfall Camden (Brownlow Hill) Rainfall Station (median
annual 694.4mm)
Climate - evaporation Badgerys Creek (median 1557mm)
Flood potential Proposed wastewater treatment system is above 1 in
100-year flood level; minor limitation.
Proposed wastewater disposal area above 1 in 20-year
flood level; minor limitation.
Frost potential The site is not known to be subject to severe frosts,
minor limitation
Exposure Northern aspect; minor limitation
Slope 7%, minor limitation for spray irrigation
Landform Upper slope, minor limitation
Run-on and seepage Minor upslope stormwater run on; minor limitation
Erosion potential Minor erosion potential
Site drainage Moderately drained soil profile; minor limitation
Evidence of fill No evidence of fill; minor limitation
Domestic groundwater use No groundwater bores within 100m
Surface rock No surface rock; minor limitation
Area available for spray irrigation 1500m2 available for spray irrigation within designated
Effluent Management Area (EMA).
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SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW 4. SOIL ASSESSMENT Method: Crowbar/shovel Depth to bedrock (m): 500mm to restrictive layer; moderate limitation Depth to high soil No groundwater or encountered at a depth of 500mm; minor watertable: limitation Coarse (%): 5-10% coarse fragments in subsoil, minor limitation pH (soil/water): pH 5.5-6; minor limitation Electrical conductivity:
SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW
5. SUMMARY OF SOIL AND SITE CONSTRAINTS
There are no significant soil or site constraints that would prevent the continued use of the
existing Aerated Wastewater Treatment System (AWTS) for wastewater treatment and new
spray irrigation for treated wastewater disposal. This is to service the 4-bedroom existing
dwelling and the proposed 2-bedroom granny flat.
The land proposed for spray irrigation is a grassed area with suitable exposure, soils and
slope. This location is compliant with the buffers and setback distances required by Wollondilly
Council. This includes being more than 15m from dwellings, 40m from drainage depressions,
100m from permanent watercourses, 3m if the area is down-gradient from property
boundaries/driveways and 6m if the area is upgradient from property boundaries and
driveways.
In accordance with the Wollondilly Shire Council, 1500m2 of land suitable for spray irrigation
has been identified. The proposed irrigation is 584m2 which leaves the remaining 916m2 as a
reserve area.
Photo 1 On-site soil assessment profile
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SOIL & SITE ASSESSMENT FOR ONSITE WASTEWATER DISPOSAL ON 65 RAPLEYS LOOP ROAD, WEROMBI NSW
Photo 2 Looking north towards the proposed spray irrigation area
Photo 3 Looking west towards the proposed spray irrigation area
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6. SYSTEM DESIGN
6.1 WASTEWATER TREATMENT SYSTEM
The existing Aerated Wastewater Treatment System will be used to treat wastewater
from the existing 4-bedroom residence and proposed 2-bedroom granny flat. The
domestic AWTS has the capacity to treat 1500L/d, whereas the design wastewater
load is 1200L/d.
Photo 4 Existing AWTS
6.2 PIPES
The sewer pipes between the plumbing amenities, treatment system and effluent disposal
area must conform with 'AS/NZS 3500(Set):2018 Plumbing and Drainage Set' specifying the
nominal pipe sizes and respective minimum grades. Table 1 contains these specifications.
In addition, where a sewer carrying untreated wastewater to a treatment system is longer
than 60 metres, the minimum grade should be doubled, and inspection ports should be
installed at least every 30 metres or at an angle or change of grade.
The sewer pipes between the plumbing amenities, AWTS and irrigation area must be buried
at a depth that provides protection against mechanical damage or deformation, in accordance
with 'AS/NZS 3500.2:2018 Plumbing and Drainage Set'. Table 2 shows the minimum pipe
depth for trafficable areas. Note that the distribution pipe will need to cross the road.
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TABLE 1 MINIMUM PIPE DIAMETER AND GRADE CALCULATIONS
Nominal pipe size (DN) Minimum grade % Minimum grade ratio
65 2.5 1:40
80 1.65 1:60
100 1.65* 1:60
125 1.25 1:80
150 1.00 1:100
* Except for drains from septic tanks, sewage treatment plants and unvented discharge pipes from
tundishes, which may have a minimum grade of 1%,
Source: ‘AS/NZS 3500.2:2018 Plumbing and drainage Part 2 Sanitary plumbing and drainage’
Table 3.4.1. NB: pipe grades are expressed as a percentage of vertical to horizontal distances.
TABLE 2 MINIMUM PIPE DEPTH FOR TRAFFICABLE AREAS
Location Minimum depth of cover (mm) for all
materials other than cast iron
Where subject to vehicular traffic 500
Elsewhere 300
Source: ‘AS/NZS 3500 (Parts 0-4):2018 Plumbing and drainage Set’. Table 3.7.2 Minimum Cover
for Buried Pipes’
The plumbing associated with the amenities will need to be approved by a licensed plumber
to ensure it is compliant with relevant codes and standards.
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7. REQUIRED IRRIGATION AREA
The irrigation area needed to manage 1200L/day of wastewater load was calculated using
monthly water and nutrient balance, following the method described in DLG (1998). Soil
texture classification for Design Irrigation Rate is from ASNZ1547(2012).
The water balance requires a 380m2 irrigation area based on the following variables:
Camden (Brownlow Hill) median monthly rainfall;
Badgerys Creek monthly average evaporation; and
Application rate of 24.0mm/week or 3.5mm/day for clay loam subsoil found at
a depth of 500mm.
The nitrogen balance requires a 548m2 irrigation area based on the following variables:
AWTS will reduce Total Nitrogen to 30mg/L; and
Vegetative rate for managed pastures is assumed to be 240kg/N/ha/year
The phosphorus balance requires a 584m2 irrigation area based on the following variables:
AWTS will reduce Total Phosphorus to 12mg/L;
P-sorption of 400mg/kg for clay loam subsoil;
Bulk density of 1.5g/cm2 for intermediate soils;
Soil depth of 0.5m. Crop uptake is assumed to be 30kg/ha/annum; and
50-year design life of system.
The largest of the three methods (most limiting) is required. For this site, the largest area of
the three methods is 584m2.
8. LOCATION AND METHOD OF IRRIGATION
584m2 of spray irrigation is proposed for the existing dwelling and proposed granny
flat.
Five quick coupling turf valves are connected to the buried distribution line so fixed
access points are available for the connection of a moveable hose and sprinkler. See
Appendix- Site Plan Sheet 1-3 for further information.
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9. SUMMARY
This assessment recommends the following:
1500m2 of land area is available for the spray irrigation;
Installation of 584m2 spray irrigation for treated wastewater disposal at the location
shown on the site plan and installed in accordance with this report; and
Retain the remaining 916m2 as a reserve area.
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10. REFERENCES
Department of Local Government (1998) On-site Sewage Management for Single
Households. NSW Government.
Standards Australia (2012) Australian/New Zealand Standard 1547:2012 On-site
domestic wastewater management. Standards Australia.
NSW Health Septic Tank Accreditation Guidelines (2001).
Hazelton, P.A and Murphy, B.W ed. (1992) What Do All the Numbers Mean? A Guide for
the Interpretation of Soil Test Results. Department of Conservation and Land
Management (incorporating the Soil Conservation Service of NSW), Sydney.
Wollondilly Shire Council’s Development Control Plan.
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APPENDIX I SEMI FIXED SPRAY IRRIGATION
a) The irrigation area is to be split into manageable areas using turf valves;
b) Within each moveable hose on the turf valve, 2 or 3 low plume wobbler/butterfly/ rose
sprinklers are to be mounted along the length of a 5m length of 19mm purple wastewater
irrigation pipe;
c) The low plume sprinklers should not be capable of producing aerosols;
d) All distribution lines shall be buried to a minimum depth of 300mm below finished surface
level or, where this is not possible, covered with 150mm of concrete;
e) The throw on the sprinklers shall not exceed beyond the designated disposal area.
f) The treated wastewater flows to each zone should be automated or manually on a regular
basis.
Management of irrigation area
g) The grass within the irrigation should be mown on a regular basis to ensure sprinklers
can be seen through the grass and any breakage or leaks can be seen and repaired;
h) The effluent disposal area shall be clearly identified within the property.
i) All stormwater and seepage from higher levels shall be diverted away from the effluent
disposal area using an upslope diversion bank or similar.
j) Fruit or salad vegetables should not be irrigated with effluent from the wastewater
treatment system.
k) The irrigation area should not be used for recreational purposes or used for parking areas.
l) Horse and cattle should not be kept within the effluent disposal area.
m) Buffer distances are 6m if area up gradient and 3m if area down gradient of swimming
pools, property boundaries and driveways; 15m buffer to buildings.
n) Two warning sign complying with AS1319:1994 – Safety signs for the occupational
environment should be located at the boundary of the designated area in one or two
places, clearly visible to property uses, with wording such as, RECYCLED WATER,
AVOID CONTACT, DO NOT DRINK’.
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o) Stormwater Run-on stormwater is to be diverted around the subsurface irrigation area by
means of an earthy bank or diversion drain. Guidance on the installation of an appropriate
earth bank and diversion drain as shown in Appendix IV.
Example of turf valve, flexible 19mm poly pipe and 'wobbler' sprinklers
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APPENDIX II GENERAL RECOMMENDATIONS TO MANAGE WATER QUALITY AND QUANTITY
Insinkerator style kitchen garbage disposal units should be avoided as they increase water
consumption and raise the nutrient and BOD concentrations of household effluent.
Water conservation can reduce the volume of wastewater that needs to be treated and
discharged on site. The residence should include appliances that are rated under the Water
Efficiency Labelling and Standards (WELS) Scheme that includes:
i. 4-star dual-flush toilets;
ii. 3-star showerheads;
iii. 4-star taps (for all taps other than bath outlets and garden taps);
iv. 3-star urinals; and
v. Water-efficient washing machines and dishwashers are to be specified and
used wherever possible.
Chemical cleaning compounds and other chemicals that enter the treatment system should
be low in phosphate and salt.
Anti bacterial chemical cleaning compounds and other chemicals that enter the treatment
system should be avoided. This includes chlorine, disinfectants, bleaches etc.
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APPENDIX III REQUIRED BUFFERS
The following buffers must be applied when installing all onsite sewage management
systems in accordance with the Wollondilly Council Development Control Plan
SYSTEM BUFFER DISTANCES
All Onsite Sewage 100 metres to domestic groundwater well
Management Systems 100 metres to permanent surface waters (e.g. rivers, creeks,
streams, lakes etc.)
150m to SCA named rivers
40 metres to other waters (e.g. dams, intermittent water courses,
overland flow paths etc.)
15metres from in-ground water tank
1 metre from the drip line of native trees and shrubs
Surface spray 6 metres if area up-slope and 3 metres if area down-slope of
irrigation buildings, driveways and property boundaries
15m to dwellings
3m to paths and walkways
6m to swimming pools
Subsurface irrigation 6 metres if area up-slope and 3 metres if area down-slope of
buildings, driveways and property boundaries
Absorption system 12m if area up-slope and 6m if area down-slope of property
boundary
6 metres if area up-slope and 3 metres if area down-slope of
buildings, driveways and property boundaries
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APPENDIX IV STANDARD DRAWING 9A - UPSLOPE DIVERSION DRAIN
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APPENDIX V WATER BALANCE
Nominated Area Water Balance for Zero Storage
Site Address: 65 Rapleys Loop Rd, Werombi
INPUT DATA
Design Wastewater Flow Q 1200 L/day
Design DIR (from AS/NZ 1547,2012) DIR 24 mm/week
Daily DIR 3.5 mm/day
Nominated Land Application Area L 380 m sq
Rainfall Data Camden (Brownlow Hill) median
Evaporation Data Badgerys Creek
Parameter Symbol Formula Units Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Days in month D \ days 31 28 31 30 31 30 31 31 30 31 30 31 365
Rainfall P \ mm/month 69.4 64.2 63.8 43.8 30 36 25.2 19.7 31.9 40.6 55.8 52.7 813.5
Evaporation E \ mm/month 202 157 136 105 81 63 81 96 120 152 183 220 1557
Crop Factor C 0.80 0.75 0.70 0.65 0.60 0.60 0.60 0.60 0.65 0.70 0.75 0.80
INPUTS
Precipitation (P) mm/month 69.4 64.2 63.8 43.8 30 36 25.2 19.7 31.9 40.6 55.8 52.7 813.5
Effluent Irrigation (W) (Q x D) / L mm/month 97.9 88.4 97.9 94.7 97.9 94.7 97.9 97.9 94.7 97.9 94.7 97.9 1152.6316
Inputs (P+W) mm/month 167.3 152.6 161.7 138.5 127.9 130.7 123.1 117.6 126.6 138.5 150.5 150.6 1685.7
OUTPUTS
Evapotranspiration ET ExC mm/month 162 118 95 68 49 38 49 58 78 106 137 176 1133.05
Percolation B (DIR/7)xD mm/month 108.5 98 108.5 105.0 108.5 105.0 108.5 108.5 105.0 108.5 105.0 108.5 1277.5
Outputs ET+B mm/month 270.1 215.75 203.7 173.3 157.1 142.8 157.1 166.1 183.0 214.9 242.3 284.5 2410.6
Storage remaining from previous month mm/month 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Storage S (P+I)-(ET+B) mm/month -102.8 -63.1 -42.0 -34.7 -29.2 -12.1 -34.0 -48.5 -56.4 -76.4 -91.7 -133.9
Cumulative Storage M mm 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00
Largest M (V) mm 0.00
(V x L)/1000 m3 0.0
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APPENDIX VI NITROGEN BALANCE
NITROGEN BALANCE
SITE ADDRESS 65 Rapleys Loop Rd, Werombi
Daily volume 1200 L/day
TN effluent conc 30.0 mg/L
TN 0.036 kg/d
13.14 kg/yr
Irrigation Area 548 m2 0.0548 ha
TN annual application rate 0.024 kg/m2/yr
239.8 kg/ha/yr
Denitrification 20%
TN Uptake (managed land) 240 kg/ha/yr
TN available for leaching 0 kg/ha/yr
Or for site -0.01 kg/yr
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APPENDIX VII PHOSPHORUS BALANCE
PHOSPHORUS BALANCE
SITE ADDRESS 65 Rapleys Loop Rd, Werombi
Daily hydraulic load 1200 L/day
TP effluent conc 12 mg/L
TP effluent conc per day 14400 mg/day
5256 g/year
P sorption rate of soil 400 mg/kg
Bulk density of soil 1.5 g/cm3
1500 kg/m3
Land application area 584.0 m2
Soil depth 0.5 m
Volume of soil 292.000 m3
Mass of soil 438000 kg
Total P sorption capacity 175200 g
Vegetation Grass
P annual uptake by vegetation 30 kg/ha/yr
1752 g/yr
Net annual P (in soil) 3504 g/yr
Life of system 50.0 years
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102.8m
61.1m
S
S
S
S
S
S
15.4m
S
S
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24.1m
S
S SITE PLAN: KEY
S
30.8m
S
PROPERTY BOUNDARY
31.1m
S
32.9m S
100mm PVC PIPE
S
S
25mm (ID) POLY PIPE
2M CONTOUR LINE
FLEXIBLE HOSE
EXISTING SHED
PROPOSED IRRIGATION AREA
PROPOSED RESERVE IRRIGATION
AREA
EXISTING DWELLING
PROPOSED GRANNY FLAT
DRAINAGE DEPRESSION / DAM
EXISTING AWTS
WATER ROTOR OR SIMILAR
TURF VALVE
Client Harris Environmental Consulting Project Drawing Title:
Issue: Description: Date Drawn Approved North PO Box 70 PROPOSED GRANNY FLAT ON-SITE WASTEWATER
Jamberoo, NSW, 2533
A HEC Standard Drawing 16/10/20 PS SH BELLE LIFESTYLE T: 02 4236 0954 MANAGEMENT SHEET 1
Drawn: Date: Scale: Q.A. Check: Date:
E: info@hec.eco LOT 5 DP 868790 Y:/Dropbox/STORMWATER DISPOSAL/Technical Drawing/tick 2.jpg
AUSTRALIA PTY PS 16/10/2020 1:800 16/10/2020
ABN: 541 287 40 549 65 RAPLEYS LOOP ROAD, WEROMBI, NSW Designed: Our reference: Dwg. No. Issue:
Wastewater | Bushfire | Stormwater LGA: WOLLONDILLY PS 3995ww #1 ASITE PLAN: KEY
HARRIS
PROPERTY BOUNDARY
S
100mm PVC PIPE
S
25mm (ID) POLY PIPE
2M CONTOUR LINE
29.5m FLEXIBLE HOSE
PROPOSED GRANNY FLAT
25.8m
PROPOSED IRRIGATION AREA
3.0m
PROPOSED RESERVE IRRIGATION
AREA
EXISTING AWTS
S
WATER ROTOR OR SIMILAR
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31.0m
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TURF VALVE
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34.4m
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12.0m S
S
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Client Harris Environmental Consulting Project Drawing Title:
Issue: Description: Date Drawn Approved North PO Box 70 PROPOSED GRANNY FLAT ON-SITE WASTEWATER
Jamberoo, NSW, 2533
A HEC Standard Drawing 16/10/20 PS SH BELLE LIFESTYLE T: 02 4236 0954 MANAGEMENT SHEET 2
Drawn: Date: Scale: Q.A. Check: Date:
E: info@hec.eco LOT 5 DP 868790 Y:/Dropbox/STORMWATER DISPOSAL/Technical Drawing/tick 2.jpg
AUSTRALIA PTY PS 16/10/2020 1:250 16/10/2020
ABN: 541 287 40 549 65 RAPLEYS LOOP ROAD, WEROMBI, NSW Designed: Our reference: Dwg. No. Issue:
Wastewater | Bushfire | Stormwater LGA: WOLLONDILLY PS 3995ww #2 AS
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WORKED EXAMPLE:
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STANDARD SPECIFICATIONS: IRRIGATION SET UP
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a) A 25mm ID (32mm OD) distribution pipe shall run from AWTS to the
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irrigation area, buried to depth of 300mm. Where it is not possible to
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bury the pipe to 300mm, the pipe should be covered with 150mm of
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concrete.
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b) Inside the irrigation area, the internal distribution pipe is buried to
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depth of 150mm.
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25MM (ID) POLY PIPE FROM
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c) Turf valves are to be connected along the internal distribution pipe at
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AWTS, BURIED 300 DEEP
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the required intervals. Depending on the size of AWTS pump / pump,
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~ 2-3 sprinklers / turf valves can operate with sufficient pressure at
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a time.
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25.0m
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GATE VALVE
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d) A 2-3m length of 19mm purple wastewater irrigation pipe is
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connected to the turf valves. A low plume wobbler / butterfly / rose
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14.0m 25MM (ID) POLY PIPE,
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BURIED 150MM DEEP sprinkler is to be mounted at end of this 19mm pipe.
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e) The low plume sprinklers should not be capable of producing
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aerosols.
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7.0m
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f) The throw on the sprinklers shall not exceed beyond the designated
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L=LENGTH
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disposal area.
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4.0m
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5.0m
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MANAGEMENT OF IRRIGATION AREA
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3.0m 25.0m
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g) The grass within the irrigation should be mown on a regular basis to
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ensure sprinklers can be seen through grass and any breakage or
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3.0m leaks can be seen and repaired.
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h) The effluent disposal area shall be clearly identified within the
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(2.5 X LENGTH)
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L=LENGTH S=SPACE property by post or some other means.
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i) All stormwater and seepage from higher levels shall be diverted
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away from the effluent disposal area using a dish drain or similar.
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j) Fruit or salad vegetables should not be irrigated with effluent from
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10.0m
(LENGTH) the wastewater treatment system.
k) The irrigation area should not be used for recreational purposes or
5m MOVEABLE used for parking a car.
PURPLE PIPE
l) Horse and cattle should not be kept within the effluent disposal
area.
TURF VALVE
m) Buffer distances are 6m if area up gradient and 3m if area down
SPRINKLER,
4m DIAMETRE,
gradient of swimming pools, property boundaries and driveways;
500m PLUME (2.5 X LENGTH) 15m buffer to buildings.
HEIGHT
occupational environment should be located at the boundary of the
designated area in one or two places, clearly visible to property
uses, with wording such as, 'RECYCLED WATER, AVOID
Note: Installer to determine the turf valve spacing required for the site.
Harris Environmental Consulting Drawing Title:
Issue: Description: Date Drawn Approved PO Box 70 ON-SITE WASTEWATER
A HEC Standard Drawing PS SH
STANDARD DRAWING: Jamberoo, NSW, 2533
MANAGEMENT
T: 02 4236 0954
Drawn: Date: Scale: Q.A. Check: Date:
E: info@hec.eco Y:/Dropbox/STORMWATER DISPOSAL/Technical Drawing/tick 2.jpg
SEMI-FIXED SPRAY IRRIGATION PS NTS
ABN: 541 287 40 549
Designed: Our reference: Dwg. No. Issue:
Wastewater | Bushfire | Stormwater PS AYou can also read
