HomeMy WebLinkAbout2689 - Site Assessment ReportU1
LISA AND MARTIN HUGHES ,
TULLY,
EMYVALE,
CO. MONAGHAN.
9vNN'a
R : NO.
PI -Q 2 6 /00
MOAHN CO. CO
a°36'3
09 SEP ?020
SITE CHARACTERISATION FORM
COMPLETING THE FORM
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Notes:
All calculations in this form are automatic.
Where possible information is presented in the form of drop down selection lists to
eliminate potential errors.
Variable elements are recorded by tick boxes. In all cases only one tick box should be
activated.
All time record fields must be entered in twenty four hour format as follows: HH:MM
All date formats are DD-MM-YYYY.
All other data fields are in text entry format.
This form can be printed out fully populated for submission with related documents and
for your files. It can also be submitted by email.
Section 3.2 In this section use an underline across all six columns to indicate the depth
at which changes in classification / characteristics occur.
Section 3.4 Lists supporting documentation required.
Section 4 Select the treatment systems suitable for this site and the discharge route.
Section 5 Indicate the system type that it is proposed to install.
Section 6 Provide details, as required, on the proposed treatment system.
APPENDIX A: SITE CHARACTERISATION FORM
File Reference: Lisa and Martin Hughes, Tully, Emyvale
•
Prefix: Ms First Name: Lisa Surname: Hughes
Address: Site Location and Townland:
Tully, Emyvale, Co. Monaghan Tully, Emyvale, Co. Monaghan.
Number of Bedrooms: !4 Maximum Number of Residents: 6
Comments on population equivalent
There are 4 double bedrooms which will equate to six adults.
Proposed Water Supply:
Mains ® Private Well/Borehole Group Well/Borehole
Soil Type, (Specify Type): Poorly drained mineral soil. Gleys. AminPD
Sandstone till. TDCSs
Subsoil, (Specify Type):
Bedrock Type: DMSSL
Aquifer Category: Regionally Important I Locally Important Lm Poor
Vulnerability: Extreme LI High Moderate Low [✓
Groundwater Body: Aughnacloy Status Poor
Name of Public/Group Scheme Water Supply within 1 km: Glaslough Tyholland GINS
Source Protection Area: ZOO SI SO j Groundwater Protection Response: R1
Presence of Significant Sites
(Archaeological, Natural & Historical):
Past experience in the area:
None
Comments: I
(Integrate the information above in order to comment on: the potential suitability of the site, potential targets at risk, and/or any potential site restrictions).
Emyvale GFC ground 95m North. Ring fort 152m South-West.
The site is potentially suitable as there appears to be no restrictions to the on -site treatment of domestic effluent. Surface
water and ground water could be targets at risk.
Note: Only information available at the desk study stage snouia oe usea in finis secuun.
3.1 Visual Assessment
Landscape Position: Elevated on an Easterly facing slope.
Slope: Steep (>1:5) Shallow (1:5-1:20) [✓ Relatively Flat (<1:20)
Slope Comment ABOUT 1:16
Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres)
Houses:
Home house 75m West, Emyvale GFC ground and ancillary buildings 95m North.
Existing Land Use:
iricultural grassland.
Vegetation Indicators:
LIT
Groundwater Flow Direction: Expected East.
Ground Condition:
Firm during a spell of very wet weather.
Site Boundaries:
Mature hedges all around
3.1 Visual Assessment (contd.)
Roads:
Local road 108m West
Outcrops (Bedrock And/Or Subsoil):
None
Surface Water Ponding:
None
Lakes:
Tully 1iiou515mm South-West
Beaches/Shellfish Areas:
None
Wetlands:
None
Karst Features:
None
Watercourses/Streams:*
Mountain river 207m East North-East.
•Note and record water level
3.1 Visual Assessment (contd.)
Drainage Ditches:*
Open dry ditch along Southern boundary hedge.
Springs:*
None within 100m
Wells:*
None within 100m
Comments:
(Integrate the information above in order to comment on: the potential suitability of the site, potential targets at risk, the suitability of the site to treat the wastewater
and the location of the proposed system within the site).
The site was in good condition underfoot with the assessment being carried out during a period of extremely wet stormy weather
with heavy rainfall.
*Note and record water level
3.2 Trial Hole (should be a minimum of 2.1m deep (3m for regionally important aquifers))
To avoid any accidental damage, a trial hole assessment or percolation tests should not be undertaken
in areas which are at or adjacent to significant sites, (e.g. NHAs, SACs, SPAs, and/or Archaeological
etc.), without prior advice from National Parks and Wildlife Service or the Heritage Service.
Depth of trial hole (m): 2.2
Depth from ground surface Depth from ground surface
to bedrock (m) (if present): to water table (m) (if present): 1.5
Depth of water ingress: 0.7 Rock type (if present):
Date and time of excavation: 02 -Oct -2025 11:301 Date and time of examination: 04 -Oct -2025 10:00
Depth of
Surface and
Subsurface
Percolation
Tests
0.1 m l I
0.2 m 0
0.3 m 0
0.4 m IS I
0.5 m 0
0.6 m 0
0.7 m 0
0.8m ISS
0.9m I
1.0m II
1.1 m II
1.2m
1.3m (
1.4 m I
1.5m ( I
1.6m l�
1.7 m
1.8 m I I
1.9m
2.0 m I
2.lml 0
2.2 m 0
2.3 m []
2.4m rii
2.5m1
2.6m II
2.7m II
2.8m
2.9 m
3.0m I I
3.1 m I
3.2 m II
3.3 m (I
3.4 m 0
3.5m I
Soil/Subsoil
Texture & Plasticity and Soil Density/
Classification"` dilatancy*** Structure Compactness
SILT / CLAY 3 threads —80mm
TOP SOIL ribbons — dilatant
SILT! CLAY subsoil 4 threads - 90mm
ribbons - dilatant
--------------------------
Water table 1.5m
SILT 1 thread -20mm
ribbons- dilatant
Base of trial hole 2.2m
Colour**** Preferential
flowpaths
CRUMB SOFT BROWN
BLOCKY UNCOMPACT PALE
BROWN
GRANULAR
SOFT
BROWN
Likely Subsurface Percolation Value: 25
Likely Surface Percolation Value: I 35
Note: 'Depth of percolation test holes should be indicated on log above. ('Enter Surface or Subsurface at depths as appropriate).
See Appendix E for BS 5930 classification.
3 samples to be tested for each horizon and results should be entered above for each horizon.
"" All signs of mottling should be recorded.
GRASS ROOTS
NONE
NONE
3.2 Trial Hole (contd.) Evaluation:
The trial hole was 2.2m deep with three distinct layers. Top -soil that was crumb in nature and below that sub -soil that was
blocky in nature and below that silt subsoil that was sandy in nature. The water table was at 1.5m after very heavy rain.
3.3(a) Subsurface Percolation Test for Subsoil
Step 1: Test Hole Preparation
Percolation Test Hole
3
Depth from ground surface 400 400 400
to top of hole (mm) (A)
Depth from ground surface 800 800 800
to base of hole (mm) (B)
Depth of hole (mm) [B - A] 400 400 400
Dimensions of hole 300 x 300 300 X 300 290 x 290
[length x breadth (mm)]
Step 2: Pre -Soaking Test Holes
Pre-soak start Date 02 -Oct -2025 02 -Oct -2025 02 -Oct -2025
Time j 14:30 14:30
2nd pre-soak Date 03 -Oct -2025 03 -Oct -2025 03 -Oct -2025
start Time 11:00 11:00 1:00
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring T100
Percolation Test Hole No. 1 2 3
Date of test 04-10-2025 04-10-2025 04-10-2025
Time filled to 400 mm 10:00 H 10:00 10:00
Time water level at 300 mm 10:50 11:10 11:20
Time (min.) to drop 100 mm (T)
50.00 70.00 80.00
Average T1 66.67
If T1> 480 minutes then Subsurface Percolation value >120 - site unsuitable for discharge to ground
If T1 ≤ 210 minutes then go to Step 4;
If T,00> 210 minutes then go to Step 5;
Step 4: Standard Method (where 1100 < 210 minutes)
Percolation
Test Hole
1
2
3
Fill no.
Start Finish At (min)
Start Finish At (min)
Start Finish At (min)
Time Time
Time Time
Time Time
(at 300 (at 200
mm) mm)
(at 300 (at 200
mm) mm)
(at 300 (at 200
mm) mm)
1
10:50 11:50 60
11:10 12:30 80
I 11:2011 12:5011 901
2
11:50 14:20 1501
I 12:30 14:5 145
I 12:50 15:20 150
3
Average At
14:20 17:55 215
14:55 18:55 240
15:20 19:5511 275
41.67
155.00
171.67
Value
Average At/4 =
[Hole No.1] 35.421(t1)
Average At/4 =
[Hole No.2] 38.75 (t2)
Average At/4 =
[Hole No.3] 42.92 (t3)
Result of Test: Subsurface Percolation Value = 39.02777777777777 (min/25 mm)
Comments:
-he T test was a pass and this subsoil should be suitable for polishing treated effluent from an advanced treatment system.
Step 5: Modified Method (where T100 > 210 minutes)
Percolation
Test Hole No.
Fall of water
Time
Start
Finish
Time
K„
T —
in hole (mm)
Factor
Time
Time
of fall
= T,
Value
= T,
hh:mm
hh:mm
(mins)
/ Tm
= 4.45
/K„
300 -250
8.1 [ 0.00 i
=I
250-200
9.7 00 0.00
1 I
200-150
I 11.9 00 0.00 I
150- 100
14.1 00 0.00 ��
Average
T- Value T- Value Hole 1 = (Ti) 0.00
Percolation
Test Hole No. 3
Fall of water Time Start Finish Time K,, T -
in hole (mm) Factor Time Tim§e of fall = T, Value
= T, hh:mm hh:mm (mins) / T,, = 4.45
= Tm /K
300-250 8.1 =0 0.00 l0
250 -200 9.7 0.00 I=
200- 150 I 11.9 =� 0.00 j=
150- 100 14.1 =_.__l 0.00 ==
Percolation
Test Hole No. 2
Fall of water
Time
Start
Finish
Time
K
T —
in hole (mm)
Factor
Time
Time
of fall
= Tf
Value
= T,
hh:mm
hh:mm
(mins)
/ Tm
= 4.45
= Tm
/K
300-250
8.1 � 0.00 �=
250 -200
9.7 � 0.00 1I
200- 150
11.9 �� 0.00 �=
150-100
14.1 ==F_6,_001==
Average
T- Value T- Value Hole 2 = (T2) 0.00
Result of Test: Subsurface Percolation Value
0 (min/25 mm)
Comments:
Average T- Value T- Value Hole 3 = (T2) I_0.001 1 1
3.3(b) Surface Percolation Test for Soil
Step 1: Test Hole Preparation
Percolation Test Hole 1 2 3
Depth from ground surface
to top of hole (mm)
Depth from ground surface I 40011 4001 I 4001
to base of hole (mm) Ii
Depth of hole (mm) F7:==400 [7==:40]0 400
Dimensions of hole
[length x breadth (mm)]
290 x 290 290 x 300 290 x 290
Step 2: Pre -Soaking Test Holes
Pre-soak start Date 02 -Oct -2025 j 02 -Oct -2025 02 -Oct -2025
Time 14:35 14:35 14:35
2nd pre-soak Date 03 -Oct -2025 03 -Oct -2025 03 -Oct -2025
start Time I 11:0 I 11:05 11:05
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring T100
1 2 3
Percolation Test Hole No. II II ' , ,
04 -Oct -25 04 -Oct -25 I 04 -Oct -2025
Date of test
10:05 10:05 10:05
Time filled to 400 mm
10:55 II 10:55 11:10
Time water level at 300 mm
50.00 I 65.00
Time to drop 100 mm (T)
55.00
Average T100
If T100 > 480 minutes then Surface Percolation value >90 - site unsuitable for discharge to ground
If T100 ≤ 210 minutes then go to Step 4;
If T100 > 210 minutes then go to Step 5;
Step 4: Standard Method (where T100 ≤ 210 minutes)
Percolation
Test Hole
1
2
3
Fill no.
Start Finish AT (min)
Time Time
Start Finish AT (min)
Time Time
Start Finish AT (min)
Time Time
(at 300 (at 200
mm) mm)
(at 300 (at 200
mm) mm)
(at 300 (at 200
mm) mm)
1I
10:55j[11:55IP60.00
10:55 12:00 6j
F--1ii:ioIp12j0I 70.001
2
11:55 13:40 105.00
12:001!13:50 110.00
12:20 14:1011 110.00
3
Average AT
13:40 16:25!r165.00113:50
16:40 170.00j
14:10 17:10 180.00
L110-010
115.00
120.00
Value
Average AT/4 =
[Hole No.1] 27.501(T)
Average AT/4 =
[Hole No.2] 28.751(12)
Average AT/4 =
[Hole No.3] 30.00 (T3;
Result of Test: Surface Percolation Value = 28.75 (min/25 mm)
Comments:
'he topsoil at this site is of good quality and may be used to raise the soil percolation area up level.
Step 5: Modified Method (where T700 > 210 minutes)
Percolation
Test Hole No. 1
Fall of water
in hole (mm)
Time
Factor
= T,
Start
Time
hh:mm
Finish
Time
hh:mm
Time
of fall
(mins)
= Tm
K,
= T
/ T
T—
Value
= 4.45
/K
300 - 250
I 8.1 0.00 I I
250 200
9.7 O�0.00 l=
200-150
11.9 OL J
150-100
14.1 =� 0.001!
Average
T- Value T- Value Hole 1 = (T1) Po
Percolation
Test Hole No. 3
Percolation
Test Hole No. 2
Fall of water
in hole (mm)
Time
Factor
=T
Start
Time
hh:mm
Finish
Time
hh:mm
Time
of fall
(mins)
Ku
= T,
/T,
T -
Value
=4.45
300 - 250
I 8.1 0.00 l �
250-200
200-150
[t[�d=F-O--OO1==
liii 0.00
150-100
14.1 =0 0.00 j�
Average
T- Value T- Value Hole 2 = (T2) I 0.001
Result of
Test: Surface Percolation Value =
o (min/25 mm)
Fall of water Time Start Finish Time K,, T- Comments:
in hole (mm) Factor Time Time of fall = T, Value
=Tr hh:mm hh:mm (mins) /T =4.45
=m /Krs
300 -250 I 8.1 0.0011 I I
250 - 200 I = 0.0011 I
200- 150 11.9 =0 0.00I==
150- 100 14.1 �� 0 0.00
Average T- Value T- Value Hole 3 = (2) 0.00
3.4 The following associated Maps, Drawings and Photographs should be appended to this site
characterisation form.
1. Discovery Series 1:50,000 Map
indicating overall drainage,
groundwater flow direction and
housing density in the area.
2. Supporting maps for vulnerability,
aquifer classification, soil, subsoil,
bedrock.
3. North point should always be included.
4. (a) Scaled sketch of site showing
measurements to Trial Hole location
and
(b) Percolation Test Hole locations,
(c) wells and
(d) direction of groundwater flow
(if known),
(e) proposed house (incl. distances from
boundaries)
(f) adjacent houses,
(g) watercourses,
(h) significant sites
(i) and other relevant features.
5. Site specific cross sectional drawing
of the site and the proposed layout'
should be submitted.
6. Photographs of the trial hole, test holes
and site including landmarks (date and
time referenced).
7. Pumped design must be designed by a
suitably qualified person.
The calculated percolation area or polishing filter area should be set out accurately on the site layout drawing in accordance with the code
of practice's requirements.
y L
I
Integrate the information from the desk study and on -site assessment (i.e. visual assessment, trial hole and
percolation tests) above and conclude the type of system(s) that is (are) appropriate. This information is also used
to choose the optimum final disposal route of the treated wastewater.
Slope of proposed infiltration / treatment area: 1:16
Are all minimum separation distances met?
Depth of unsaturated soil and/or subsoil beneath invert of gravel
(or drip tubing in the case of drip dispersal system) 0.90
Percolation test result: Surface: 2!j Sub -surface: 39.03
Not Suitable for Development f Suitable for Development
Identify all suitable options
Septic tank system (septic tank and
percolation area) (Chapter 7) No
2. Secondary Treatment System
(Chapters 8 and 9) and soil polishing filter Yes
(Section 10.1)
3. Tertiary Treatment System and Infiltration /
treatment area (Section 10.2) Yes
Propose to install:
and discharge to:
Discharge Route'
Groundwater
Secondary Treatment System and soil polishing filter L]
Ground Ground Water 0
Invert level of the trench/bed gravel or drip tubing (m) 0.60
Site Specific Conditions (e.g. special works, site improvement works testing etc.
Mechanical aeration system and a soil polishing filter to be installed and constructed to EPA 2021 specifications. The
percolation area shall be made level using the insitu topsoil. I recommend 60m of percolation trench in the soil polishing filter
consisting of 6 lengths of trench each measuring 10m. The invert of the percolation trenches should be at 0.6m with 0.9m
pervious unsaturated soil below to ensure proper polishing of the final effluent. The percolation area shall measure 13m x
13m. Ensure that the final effluent from the mechanical aeration system is distributed evenly to each of the six percolation
trenches. It is important to ensure that the percolation trenches and related pipe work are put in at the correct slope. A surface
water drain measuring I m deep shall be employed (min 2m away) up -slope from the raised mound soil polishing filter to divert
surface water away from the percolation area. The open dry ditch along the Southern boundary hedge shall be piped and
stoned.
NOTE: It is very important to ensure that the aeration pump remains on at all times on the mechanical aeration system or
otherwise the system will revert to septic conditions causing odors and poorer quality effluent which may lead to clogging of
the percolation trenches.
' A discharge of sewage effluent to "waters" (definition includes any or any part of any river, stream, lake, canal, reservoir, aquifer, pond, watercourse or other
inland waters, whether natural or artificial) will require a licence under the Water Pollution Acts 1977-90. Refer to Section 2.4.
SYSTEM TYPE: Septic Tank Systems (Chapter 7)
Tank Capacity (m3) Percolation Area
Mounded Percolation Area
No. of Trenches No. of Trenches 5.00
Length of Trenches (m) Length of Trenches (m) 10.00
Invert Level (m) Invert Level (m) 0.60
SYSTEM TYPE: Secondary Treatment System (Chapters 8 and 9) and polishing filter (Section 10.1)
Secondary Treatment Systems receiving septic tank effluent Packaged Secondary
(Chapter 8) Treatment Systems
receiving raw wastewater
(Chapter 9)
Media Type Area (m2)*
Depth of Filter Invert Level Type
Sand/Soil I
BAF TREATMENT SYSTEM
Soil
Capacity PE 6
Constructed Wetland
Sizing of Primary Compartment
Other
2 90 m3
Polishing Filter*: (Section 10.1)
30.00 Option 3 - Gravity Discharge 60.00
Surface Area (m2)*
Trench length (m)
Option 1 - Direct Discharge
r�
Option 4 - Low Pressure
Surface area (m2)
Pipe Distribution
Option 2 - Pumped Discharge
Trench length (m)
Surface area (m2)
O
Option 5 - Drip Dispersal
Surface area (m2)
SYSTEM TYPE: Tertiary Treatment System and infiltration / treatment area (Section 10.2)
Identify purpose of tertiary
Provide performance information Provide design information
treatment
demonstrating system will provide
required treatment levels
DISCHARGE ROUTE:
Groundwater 0✓ Hydraulic Loading Rate * (I/m2.d) 30.00
Surface Water ** Discharge Rate (m3/hr) I 0.38
* Hydraulic loading rate is determined by the percolation rate of subsoil
** Water Pollution Act discharge licence required
Surface area (m2) 30.00
QUALITY ASSURANCE:
Installation & Commissioning
System to be signed off by a suitably qualified person and recommendations in section 5.0 to be adhered to. Package
treatment system must conform to EN 12566-3 standard. Package treatment system to be properly installed and certified by
company supplying the system in accordance with the EPA 2021 code of practice. Keep records of desludging for five years.
On -going Maintenance
Desludge tank as recommended by manufacturer and periodically inspect the system for damage or surface ponding.
Maintenance contract to be agreed by company supplying the package treatment system and contract must be adhered to so
as to ensure that the system continues to function properly.
Company: Fiiabs
Prefix: Mr 0 First Name: Michael Surname: Holohan
Address:
TERERA, SCOTSTOWN, CO. MONAGHAN
Qualifications/Experience: GSI / EPA CERTIFIED
Date of Report: 06 -Oct -2025
Phone: 0868169162 E-mail biolabsirl@outlook.com
Indemnity Insurance Number: 1 AP10002262
Signature:
UF.{Z12YGASSAN
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WELLS AND BOREHOLES ADJACENT TO THE SITE
KILLUiJvkl-, U Public Supply Source Protection Areas
1 ti'vale SI-Inner Protection Area
TONYNUMERY SO -Outer Protection Area
DERRYGASSAN ; !L: r,i,(11iF:
UPPER
DRUMMULLY
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LOWER
PORTINAGHY
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SOURCE PROTECTION DATA (N/A)
RIVERS AND LAKES
PULL(`,
AQUIFER CATEGORY Lm
m
VULNERABILITY LOW
BEDROCK DMSSL
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SKETCH OF PERCOLATION AREA INCLUDING SITE SURROUNDS
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VIEWS OF PERCOLATION SITE
OPEN DRY DITCH AT THE SOUTHERN BOUNDARY HEDGE
THE LOWLAND BELOW THE SITE FLOODED DUE TO TORRENTIAL RAIN
.
'•
' MR *\
TRIAL HOLE ON DAY OF EXCAVATION
TRIAL HOLE TWO DAYS AFTER EXCAVATION
T TEST HOLES
P TEST HOLES
r
`1
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P2
OUTLINE SPECIFICATIONS FOR MOUNDED SOIL POLISHING FILTER
1. Treated effluent from the mechanical aeration sump unit shall be pumped
intermittently or fed by gravity if the levels allow to the distribution
chamber on the percolation area feeding the 6 percolation trenches. The
percolation area shall be made level using the topsoil from the site. The
percolation area shall measure 13m x 13m and may be landscaped into the
contour of the site.
2. The slope of the percolation trenches from the distribution chamber shall be 1
in 200.
3. The length of each of the 6 percolation trenches shall be 10m. Total length
60m.
4. The separation distance between the percolation trenches shall be 2m (ie
2.5m centre to centre)
5. Percolation pipes shall be 100mm diameter smooth wall uPVC sewer pipes,
perforated at 4, 6 and 8 o'clock. Perforations shall be 8mm diameter, at
75mm centre's along the pipe. Holes shall be checked before installation to
ensure they are free from debris.
6. The width of each percolation trench shall be 500mm.
7. The depth of each percolation trench shall be 600mm below the mound
surface.
8. Percolation pipes shall be laid on a 250mm bed of washed gravel, having
particles in the range of 8 - 32mm.
9. Pipe surround shall be washed gravel, having particle size in the range 8 -
32mm.
10. Pipe cover shall be 150mm depth of washed gravel, having particle size in
the range of 8 - 32mm.
11. Geotextile layer to be placed on top of this followed by 100mm topsoil to
top of mound.
12. Geotextile shall be in accordance with EN ISO 10319.
Access / inspection points and vents shall be provided for the ends of the
percolation pipes. Covers shall be visible and installed to prevent the
ingress of water. They shall be suitable for rodding and scouring purposes.
13. A surface land drain 1m deep shall be employed upslope of the soil polishing
filter and not closer than 2m to divert surface water away from it and prevent
the water table rising in wet weather.
14. The open dry ditch along the Southern boundary hedge shall be piped and
stoned.
SCHEDULE OF SITE SEPARATION DISTANCES
PACKAGE TREATMENT SYSTEM
. Minimum distance to any dwelling = 7m
. Minimum distance to site boundary = 3m
. Minimum distance to trees = 3m
. Minimum distance to roads = 4ni
Minimum distance to slope breaks = 10m
. Minimum distance to watercourse / streams = 10m
. Minimum distance to soakaway = 10m
. Minimum distance to open drain = 1 Om
. Minimum distance to lake or foreshore = 50m
6.3 EPA Code of Practice 2021
POLISHING FILTER
. Minimum distance to any dwelling = 10m
. Minimum distance to site boundary = 3m
. Minimum distance to trees = 3m
. Minimum distance to roads = 4m
. Minimum distance to slope breaks = 10m
. Minimum distance to water course / stream = 10m
. Minimum distance to soakaway = 10m
. Minimum distance to open drain = 10m
. Minimum distance to lake or foreshore = 50m
. Minimum distance to up gradient well = 15m
. Minimum distance well on same level = 30m
. Minimum distance to down gradient well = 40m
able 6.1 EPA Code of Practice 2021 unless stated otherwise
GROUND LEVEL
TOPSOIL
100MM
GEOTEXTILE LAYER
150MM WASHED
STONE ABOVE PIPE
0.6M
O 100MM PIPE
250MM WASHED
STONE BELOW PIPE
INVERT OF TRENCH
SUBSOIL MIN 0.9M
WATER TABLE
EACH TRENCH 500MM WIDE
SECTION THROUGH SUBSOIL PERCOLATION SYSTEM