HomeMy WebLinkAbout2651 - Site Assessment ReportFOR
MONICA McENTEE,
DRUMGUILL,
THREEMILEHOUSE,
CO. MONAGHAN.
MON. CO. CO.
PLANNING SECTION
I i J U N 2026
REG. NO
PLANNING DEPARTMENT
REF. NO.
26/51
MONAGHAN CO. COUNCIL
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.
II
APPENDIX A: SITE CHARACTERISATION FORM
File Reference: Monica McEntee, Drumguill, TMH, Co Monaghan
Prefix: MS First Narne: Monica Surname: McEntee
Address: Site Location and Townland:
- - [DrumuillThreemilehouse, Co Monaghan
Number of Bedrooms: 13
Comments on population equivalent
Maximum Number of Residents: K�
There are 3 double bedrooms which will equate to five adults.
Proposed Water Supply:
Mains Private Well/Borohofr, Group Well/Borehole
Soil Type, (Specify Type): I Acid brown earth. Deep well drained mineral soil. AminDW.
Sandstone and shale till. TLPSsS
Subsoil, (Specify Type):
Bedrock Type: OM
Aquifer Category: Regionally Important Locally Important Poor PI
Vulnerability: Extreme fjj High ❑ Moderate ❑ Low �✓
Groundwater Body: Keady Status Good
Name of Public/Group Scheme Water Supply within 1 km: stranooden Gws
Source Protection Area: ZOC SI SO ❑ Groundwater Protection Response: R1 jjj
Presence of Significant Sites
(Archaeological, Natural & Historical):
Past experience in the area:
None.
Vone
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).
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 snouw ne used in this secuon.
3.1 Visual Assessment
Landscape Position: Elevated on South South -Easterly facing slope.
Slope: Steep (>1:5) Shallow (1:5-1:20) �✓ Relatively Flat (<1:20)
Slope Comment ABOUT 1:15
Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres)
Houses:
Dwelling house adjacent to house treatment system being applied for 15m North, Dwelling house 101 m South South -East.
Dwelling house 115m East North-East. Poultry unit 65m North North-East. Threemilehouse village 170m South -East.
Existing Land Use:
Agricultural grassland.
Vegetation Indicators:
Grass.
Groundwater Flow Direction: Expected South South -East.
Ground Condition:
Firm during a spell of unsettled wet weather.
Site Boundaries:
Mature hedges and wall along Northern boundary.
3.1 Visual Assessment (contd.)
Local road along Northern boundary.
)s (Bedrock And/Or Subsoil):
None
Surface Water Ponding:
None
Kilnacey lake 663m east
s/Shellfish Areas:
None
None
natures:
None
)urses/Streams:*
Un-named stream 70m South South -East
*Note and record water level
3.1 Visual Assessment (contd.)
Drainage Ditches:`
None within 50m
None within 100m
Wells:
Abandoned well 80m South
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 I—ation of the propod s system within the site).
The site was in good condition underfoot with the assessment being carried out during unsettled wet weather. The old well to the
South has been disconnected and closed up.
"Note and record water level
3.2 Trial Hole (should be a minimum of 2.1m deep (3m for regionally important aquifers))
iu LtVUIU w ly UUUIUUI I<<ti uw I iaw, u iu I:uiu 4 : U�� I iul i i u I'elation 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): j2.1
Depth from ground surface Depth from ground surface
to bedrock (m) (it present): to water table (m) (if present): 1.7
Depth of water ingress: f 0.4 Rock type (if present): None
Date and time of excavation: 11 -Dec -2024] 10:00 Date and time of examination: 13 -Dec -2024 I 09:00
Depth of
Surface and
Subsurface
Percolation
Tests
0.lml___
0
0.2m I
0.3m I
0.4m IS I
0.5m II
0.6m II
0.7 m 0
0.8m SS
0.9m 0
1.Om rI
1.1 m I
1.2m 0
1.3m
1.4 m
1.5m I
1.6m I
1.7 m 1I
1.8 m II
1.9m II
2.0m
2.1 m
2.2 m 1I
2.3m 0
2.4m
2.5 m
2.6m
2.7m1___
2.8 rn I
2.9m
3.0 m 0
3.1 m EI
3.2m 0
3.3m I
3.4rn PI
3.5m PI
Soil/Subsoil
Texture & Plasticity and Soil Density/
Classification" dilatancy*" Structure C r ,_,,
SILT/ CLAY
TOP SOIL
SILT / CLAY subsoil
Base of trial hole 2.1m
3 threads —60mm
ribbons — dilatant
4 threads - 80mm
ribbons - dilatant
GRANULAR
BLOCKY
UNCOMPACT
UNCOMPACT
Colour"" Preferential
flowpaths
BROWN
PALE
BROWN
Likely Subsurface Percolation Value: I 30
Likely Surface Percolation Value: 20
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
010101
3.2 Trial Hole (contd.) Evaluation:
The trial hole was 2.1 m deep with two distinct layers. Top -soil that was granular in nature and below that sub -soil that was pale
brown in colour and blocky in nature. No massive clay present. The water table was at 1.7m. We encountered piping to the old
well 80m South in the trial hole and this well has been abandoned and closed up.
3.3(a) Subsurface Percolation Test for Subsoil
Step 1: Test Hole Preparation
Percolation Test Hole 2 3
Depth from ground surface I
40011
400
400
to top of hole (mm) (A)
Depth from ground surface
800
800
800
to base of hole (mrn) (B)
Depth of hole (mm) [B - A]
400E--=400
400
Dimensions of hole
280 x 280
290 x 290
290 x 290
[length x breadth (mm)]
Step 2: Pre -Soaking Test Holes
Pre-soak start Date 11 -Dec -2024 11 -Dec -2024 11 -Dec -2024
Time 13:00 13:00 13:00
2nd pre-soak Date 12 -Dec -2024 12 -Dec -2024 12 -Dec -2024
start Time 4:00 14:00 14:00
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring T,00
Percolation Test Hole No. 1 2 3
Date of test 13-12-2024 13-12-2024 13-12-2024
Time filled to 400 mm 09:00 09:00!09:00
Time water level at 300 mm 10:10 1000 10:00
Time (min.) to drop 100 mm (T,.) I 70.00 60.00 60.00
Average T,a, 63.33
If T,�, > 480 minutes then Subsurface Percolation value >120 — site unsuitable for discharge to ground
If T,110 ≤ 210 minutes then go to Step 4;
If T100> 210 minutes then go to Step 5;
Step 4: Standard Method (where T,nn < 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
rnm) mm)
(at 300 (at 200
mm) mm)
1
10:10 11:30 801
10:00 11:10 70
10:00 701
2
P 11:30 13:40 130
11:10 13:10 120
I 13:0011 110
3
Average At
j 13:40 16:50 190
13:10 16:30 200
13:00 16:00 180
133.33
130.00
120.00
Value
Average At/4 =
[Hole No.1] 33.331(t1)
Average At/4 =
[Hole No.2] I 32.501(t2)
Average At/4 =
[Hole No.3] 30.00 (t3)
Result of Test: Subsurface Percolation Value = 31.944444444444446 (min/25 mm)
Comments:
he T test Was a pass and this soil should be suitable for percolating effluent from an advanced treatment system.
Step 5: Modified Method (where T,00 > 210 minutes)
Percolation
Test Hole No.
Fall of water
Time
Start
Finish
Time
K
in hole (mm)
Factor
Time
Time
of fall
=T,
T,
hh:mmhh:mm
(mins)
/ T
L-
300 - 250
8.1 0.001) I
250-200
9.7 L 0.00 I I=
200 - 150
11.9 =� 0.00 = �
150-100
14.1 I 0.0011 ( I
Average
T- Value T- Value Hole 1 = (T1) I 0.00
Percolation
Test Hole No. 3
Fall of water Time Start Finish Time Kr, T —
in hole (mm) Factor Time Tim§e of fall = T Value
-T, hh:mm hh:rnm (mins) /T, =4.45
=T /K
300-250 I 8.1 =� 0.00 lI
250-200 0.00 P I=
200-150 11.9 11111=I 0.00 �I
150- 100 14.1 =0 �
0.00 =
Percolation
Test Hole No. 2
Fall of water
Time
Start
Finish
Time
K,
T -
in hole (mm)
Factor
Time
Time
of fall
= T,
Value
= T,
hh:mm
hh:mm
(miss)
/ T
= 4.45
= T
/1<.
300-250
8.1 =� 0.00
= I
250 -200
I I______ 0.00
==
200-150
P11.9 =� 0.00
=�
150 - 100
14.1 = 0.00
1 i =
Average
T- Value T- Value Hole 2 = (T2) 0.00
Result of Test: Subsurface Percolation Value =
0 (min/25 mm)
Comments:
Average I T- Value T- Value Hole 3 = (T2) I 0.00 � �
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 400 4001 4001
to base of hole (mm) II
Depth of hole (mm) 400 400 400
Dimensions of hole
290 x 280 290 x 290 310 x 290
[length x breadth (mm)]
Step 2: Pre -Soaking Test Holes
Pre-soak start Date
Time
2nd pre-soak Date
start Time
11 -Dec -2024
13:05
12 -Dec -2024
4:05
11 -Dec -2024
13:05
12 -Dec -2024
14:05
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring T100
1 2 3
Percolation Test Hole No.
13 -Dec -24 j 13 -Dec -24 H 13 -Dec -2024
Date of test
09:05 j 09:05 09:05
Time filled to 400 mm
09:50 II 09:50
Time water level at 300 mm
45.00 H 40.00 1 45.00
Time to drop 100mm(T)
43.33
Average T,0o
11 -Dec -2024
13:05
12 -Dec -2024
14:05
If T100 > 480 minutes then Surface Percolation value >90 - site unsuitable for discharge to ground
If T1Ca ` 210 minutes then go to Step 4;
If T100> 210 minutes then go to Step 5;
Step 4: Standard Method (where T,0e < 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
09:50 10:50M60.0
09:45 10:40 55.0
09:50!!10:55 65.00
2
10:50 12:10 80.00
10:40 12:00 80.00
I 10:55!!12.15 80.00
3
AverageAT
12:10 14:40j 150.00
12:00 14:j 140.00
12:15 14:25 130.00
96.67
91.67
91.67
Value
Average AT/4 =
[Hole No.11 24.17j(T1)
Average AT/4 =
[Hole No.2] I 22.921(T2)
Average AT/4 =
[Hole No.3] 22.921(T3
Result of Test: Surface Percolation Value = 23.33 (min/25 mm)
Comments:
The topsoil at this site is of good quality.
Step 5: Modified Method (wits.,; ; )0 10 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
(rains)
T
K,,
= T,
/ T,
LVa
300 -250
I 8.1 0.0011
250 - 200
9.7 =� 0.00 � �
200-150
.00 �
11.9 =� 0�
150-100
1 14.1 =� 0.00 I
Average
T- Value T- Value Hole 1 = (Tr) I 0.00
Percolation
Test Hole No. 3
Percolation
Test Hole No. 2
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) / T = 4.45
=L / K,-
300-250 8.1 0.00 l=
250 - 200 9.7 =� 0.00 l=
200 - 150 11.9 =� 0.00 [=
150-100 14.1 0.0011
Average I T- Value T- Value Hole 2 = (1-,r) I 0.001
Result of Test: Surface Percolation Value =
0 (min/25 mm)
Fall of water Time Start Finish Time Comments:
in hole (mm) Factor Time Time of fall Value
= T, hh:mm hh:mm (mins) i = 4.45
=T /K.
300 -250 I 8.1 0.00 r1
250 - 200 9.7 0.00 1�
200 - 150 I11.9 0.00 p�
150 - 100 I 14.1 O.Oo p�
Average T- Value T- Value Hole 3 = (T,) L0.00
3.4 The following associated Maps, Drawings and Photographs should be appended to this site
characterisation form.
Discovery SerlkS l:�U,UUU IVlap
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.
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: �`L�
Are all minimum separation distances met? V'
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: 23.33
Not Suitable for Development I
Identify all suitable options
Septic tank system (septic tank and
percolation area) (Chapter 7) No
Secondary Treatment System
(Chapters 8 and 9) and soil polishing filter Yes
(Section 10.1)
3. Tertiary Treatment System and Infiltration /
Yes
treatment area (Section 10.2)
Sub -surface: 31.94
Suitable for Development i_____
Discharge P t
Groundwater
Propose to install: Secondary Treatment System and soil polishing filter
and discharge to: 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. 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 15m. 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 1 m deep shall be employed (min 2m away) up -slope
from the soil polishing filter to divert surface water away from the percolation area and to prevent the water table rising in wet
weather.
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 "craters" (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) f Percolation Area
No. of Trenches
Length of Trenches (m)
Invert Level (rn) 0
Mounded Percolation Area
No. of Trenches 6.00
Length of Trenches (m) I 10.00
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
BAF TREATMENT SYSTEM
Soil
Capacity PE 15
Constructed Wetland
Sizing of Primary Compartment
Other
2 75 m3
Polishing Filter*: (Section 10.1)
z
30.00 Option 3 - Gravity Discharge 60.00
0
Surface Area (m' )"
Trench length (m)
Option 1 - Direct Discharge
Surface area (m2)
Option 4 - Low Pressure
Pipe Distribution
Option 2 - Pumped Discharge
Trench length (m)
Surface area (m2)
0
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 ✓❑ Hydraulic Loading Rate ` (I/m1'.d) I 25.00 Surface area (m2) I 30.00
Surface Water `* Discharge Rate (m3/hr) 0.03
Hydraulic loading rate is determined by the percolation rate of subsoil
** Water Pollution Act discharge licence required
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: IB1o1abs
Prefix: Mr E] First Name: Michael Surname: Holohan
Address:
ITERERA, SCOTSTOWN, CO. MONAGHAN
Qualifications/Experience: IGSI / EPA CERTIFIED
Date of Report: I 14 -Dec -2024
Phone: 0868169162 E-mail biolabsirl@gutlook.com
Indemnity Insurance Number: API0002262
Signature:
WELLS AND BOREHOLES ADJACENT TO THE SITE
Public Supply Source Protection Areas
SI-Inner Protection Area
SO -Outer Protection Area
SOURCE PROTECTION DATA (N/A)
RIVERS AND LAKES
\
\
\
AQUIFER CATEGORY PI
0• -% I ,: Is
1'0
411,
VULNERABILITY LOW
Pr'
t•
pq
,
AERIAL VIEW OF PERCOLATION SITE
T N
c-i:a4n�d
Flow
SKETCH OF PERCOLATION AREA INCLUDING SITE SURROUNDS
$p'• R• �+�►
- �
.tea- .gin,
.:
4r.I.
+V*g
l'b �P1J
It..vd.f ��
i.!�'1�'s 7�!'�b
•rs t
F
� r _ '�' i J � iii
F�.°if��,.a ..'�� _, r:...i� .- - ..:.7 .. � _ _-�>�tWs ".
VIEWS OF PERCOLATION SITE
d
.* 1.
if: �' l �i1 .. i :. TF �L1
ABANDONED WELL 80M SOUTH
\\ -:
• p --4,t .-.---------
.. I __ ---
I
3. �q
��f n
HOUSE FOR WHICH TREATMENT SYSTEM BEING APPLIED FOR
+F
�W--. .r• -� mod_- - � . ,�
54
I�� fit' . .�•x.,� .��t. - -�, �..y .,c ,� ` � � + r�� .. � - d ..
C .
' r
4
( - •` l�•,„fir t' ..
`\ fit, s '•+ , a�'' /•, � ., •
Y. • . _ i a � Vii•-> __
TRIAL HOLE ON DAY OF EXCAVATION
TRIAL HOLE TWO DAYS AFTER EXCAVATION
Ti
T2
T3
T TEST HOLES
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
feeding the 6 percolation trenches.
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 trenched 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 from the soil polishing
filter and not closer than 2m to divert surface water away from it and to
prevent the water table rising in this area during wet weather.
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 = 4m
. Minimum distance to slope breaks = 10m
. Minimum distance to watercourse / streams = 10m
. Minimum distance to soakaway = 10m
. Minimum distance to open drain = 10m
. Minimum distance to lake or foreshore = 50m
able 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
ble 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