HomeMy WebLinkAbout2668 - Site Assessment ReportV1�
FOR
KEVIN O'HAGAN,
DERRYRELLAN,
KILLYBRONE,
CO MONAGHAN.
Ff_.ANNNJUNG DEPARTMENT
FEF. NO.
NCIL
Np CO. CO.
PLANNING SECTION
/4 jUL 2u26
REG. NO
APPENDIX A: SITE CHARACTERISATION FORM
File Reference: Kevin O'Hagan, Cavan Moutry, Emyvale.
Prefix: Mr EI First Narne: Kevin Surname: O'Hagan
Address:
nl rnirallan Killvhrnna (:n_I\Annanhnn
Site Location and Towniand:
DerryreIlan, Killybrone, Co -Monaghan.
Number of Bedrooms: I4 [E Maximum Number of Residents: 6
Comments on population equivalent
There are 4 double bedrooms which will equate to six adults.
Proposed Water Supply:
Mains V Private Well/Borehole
Soil Type, (Specify Type):
Subsoil, (Specify Type):
Bedrock Type: IDMSSL
MON. CO.
.ANNING SECTION
14 JUL 2026
REG. NO I Group �ell/Borehole
'oorly drained mineral soil. Gleys. AminPD
Sandstone and shale till TLCSsS
Aquifer Category: Regionally Important Loc ly i}r / Lm Poor EJ
No
Vulnerability: Extreme High Moderate
Groundwater Body: Aughnacloy Status Poor
Name of Public/Group Scheme Water Supply within 1 km: Tru
R 1
Source Protection Area: ZOO SI SO Groundwater Protec i''
pC)M:
Presence of Significant Sites
(Archaeological, Natural & Historical):
Past experience in the area:
Raised mounds gererally required in this area.
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 should be used in this section.
3.1 Visual Assessment
--- -------
Landscape Position: Low-lying near base of North -Easterly facing slope.
Slope: Steep (>1:5) jj Shallow (1:5-1:20) Relatively Flat (<1:20) ✓1
Slope Comment About 1:18
Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres)
Houses:
Dwelling house 55m East North-East, 99m North North-West and 102m North-West.
Existing Land Use:
Agricultural grassland.
Vegetation Indicators:
Grass
Groundwater Flow Direction: Expected North-East.
Ground Condition:
Firm during a spell of wet weather.
Site Boundaries:
Mature hedges all around.
3.1 Visual Assessment (contd.)
Roads
Local road along the North-Eastern boundary hedge.
Outcrops (Bedrock And/Or Subsoil):
None
Surface Water Ponding:
None
Lakes
Lough More 3.2km South -East.
Beaches/Shellfish Areas:
None
Wetlands:
None
Karst Features:
None
Watercourses/Streams:*
Rakelly river 282m South -East.
*Note and record water level
3.1 Visual Assessment (contd.)
Drainage Ditches:'
Open ditch along North-East boundary hedge. 1 m deep containing 0.2m water
Springs:*
None listed 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 wet weather.
"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): 2.1
Depth from ground surface Depth from ground surface
to bedrock (m) (if present): to water table (m) (it present): 1.3
Depth of water ingress: 0.81 Rock type ff present): None
Date and time of excavation: 08 Jun 2026 12:30 Date and time of examination: 10 -Jun -2026 I 10:00
Depth of
Surface and
Subsurface Soil/Subsoil
Percolation Texture & Plasticity and Soil Density/ Colour**** Preferential
Tests Classification** dilatancy*** Structure Compactness flowpaths
0.1 m
0.2 m j
0.3m1
0.4 m 0
0.5 m III
0.6 m ri
0.7 m EI
0.8m FS
0.9m lI
1.0 m 0
1.1 m
1.2 m L.iiilli
1.3m1
1.4m I
1.5 m
1.6m
1.7m C]
1.8m 0
1.9 m
2.0m
2.1 m
2.2 m
2.3 m ]
2.4 m II
2.5 m I
2.6 m II
2.7 m II
2.8 m
2.9 m
3.Om 0
3.1 m 0
3.2m1
3.3 m
3.4 m
3.5m
SILT/ CLAY 3 threads -70mm
TOP SOIL ribbons — dilatant
5 threads - 110mm
SILT / CLAY subsoil ribbons - dilates
50% clay with difficulty.
Water table 1.3m
Base of trial hole 2.1 m
O
Likely Subsurface Percolation Value: _.2i
Likely Surface Percolation Value: 30
CRUMB
BLOCKY
SOFT
UNCOMPACT
BROWN GRASS ROOTS
NONE
PALE
BROWN
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.
3.2 Trial Hole (contd.) Evaluation:
The trial hole was 2.1 m deep. There were two distinct layers. Silt / clay top -soil and below that sub -soil that was blocky in
nature with about 40% clay. The water table was at 1.3m
3.3(a) Subsurface Percolation Test for Subsoil
Step 1: Test Hole Preparation
Percolation Test Hole
Depth from ground surface
to top of hole (mm) (A)
Depth from ground surface
to base of hole (mm) (B)
Depth of hole (mm) [B - A]
Dimensions of hole
[length x breadth (mm)]
Step 2: Pre -Soaking Test Holes
2
400 400 400
800 80011
800
400 400 fl
400
290 x 280 fi
280 x 30011 270 x 310
Pre-soak start Date08-Jun-2026
08 -Jun -20261
I 08 -Jun -2026
Time
16:30
16:30
16:30
2nd pre-soak Date
09 -Jun -2026
09 -Jun -2026109
-Jun -20261
start Time
15:00
I 15:00
15:00
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring T100
Percolation Test Hole No.
1
1
2
3
Date of test
10-06-2026
10-06-2026
10-06-2026
Time filled to 400 mm 1 10:0011 10:0011 10:00
Time water level at 300 mm I 13:20 13:3011 13:401
Time (min.) to drop 100 mm (T700) 200.00 210.0011 220.001
Average T100 210.00
If T100 > 480 minutes then Subsurface Percolation value >120 — 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)
Start
Finish At (min)
Start Finish At (ruin)
Time Time
Time
Time
Time Time
(at 300 (at 200
(at 300
(at 200
(at 300 (at 200
mm) mm)
mm)
mm)
mm) mm)
1
I II II 0.00
I II
II 0.00
I II 0.00
_II
2
II II 0.001
II II o.00l
I IP II 0.00
3
ii 0.001
II0 0.00l
II II 0.00
Average At
0.00
0.00
0.00
Value
Average At/4 = Average At/4 = Average At/4 =
[Hole No.1] I 0.001(t1) [Hole No.2]
I 0.001(t2) [Hole No.3] 0.00 (t3)
Result of Test:
Subsurface Percolation Value = 10.00 (min/25 mm)
Comments:
With the sub -surface tests being slow I proceded to step 5
Step 5: Modified Method (where T100>210 minutes)
Percolation
Percolation
Test Hole No.
1
Test Hole No. 2
Fall of water
Time Start Finish Time K„ T-
Fall of water Time Start Finish Time K,, T-
in hole (mm)
Factor Time Time of fall = T, Value
in hole (mm) Factor Time Time of fall = T Value
=T, hh:mm hh:mm (rains) /T =4.45
=T, hh:mm hh:mm (rains) /T, =4.45
= T /K,
= Tm /Kr
300-250 8.1 13:20 14:20 60.0011 0.1411 32.96
300-250 I8.1 13:30 14:50 80.0011 o.ioll 43.95
250 - 200 I9.7
14:20 15:40 80.0011_0.1211_36.70]
250 - 200 I9.7 14:50 16:00 70.0011 0.1411 32.11
200 -150
I 11,9 15:40 17:551 -I35.00 0.09 50.48
200- 150 I__11.91116:00 18:00 120.00 0.10 44.87
150 - 100
14.1 17:551120:4011165.00 0.09 52.07 I
150 - 100 I 14.1 18:00 21:10 190.00 0.07 59.96
Average
T- Value T- Value Hole 1 = (T1) 43.06 I
Average T- Value T- Value Hole 2 = (T2) 45.23
Result of Test: Subsurface Percolation Value =
Percolation
45.27 (min/25 mm)
Test Hole No.
3
Fall of water
Time Start Finish Time K,. T—
Comments:
in hole (mm)
Factor Time Tim§e of fall =T Value II
= T, hh:mm hh:mm (mins) /T,n = 4.45
A raised mound will be required due to the amount of clay
=T /J
in the subsoil.
300 - 250
I8.1 13:40 I 15:10 90.0011 0.09D 49.44
250- 200
9.7 115:10116:20 7opjI 0.1411 32.11
200- 150
11.9 16:20 I 18:30 130.0011 0.09f61
150-100
14.1 18:30 21:40 190.0011 0.07 Ir96I
Average
T- Value T- Value Hole 3 = (T2) I 47.53
3.3(b) Surface Percolation Test for Soil
Step 1: Test Hole Preparation
Percolation Test Hole 1 2 3
Depth from ground surface I II 1I 1
to top of hole (mm)
Depth from ground surface 400 400 400
to base of hole (mm)
Depth of hole (mm) 1 40011 40011 400
Dimensions of hole
[length x breadth (mm)] I 290 x 280 11 280 x 28011 290 x 2701
Step 2: Pre -Soaking Test Holes
Pre-soak start Date 08 -Jun -2026 08 -Jun -2026 08 -Jun -2026
Time 16:35 16:35 16:35
2nd pre-soak Date 09 -Jun -2026 09 -Jun -2026 09 -Jun -2026
start Time 15:05 15:05 15:05
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring T100
Percolation Test Hole No.
Date of test I
10 -Jun -26
10 -Jun -26 1 1
10 -Jun -2026
Time filled to 400 mm
10:05
10:0511
10:05
11:15
11:10
11:15
Time water level at 300 mm
70.00 II
65.00
70.00
Time to drop 100 mm (1)
68.33
Average Ti.,
If T,00 > 480 minutes then Surface Percolation value >90 - site unsuitable for discharge to ground
If T1 ≤ 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)
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)
1I
11:15 12:4011 85.00
11:10 12:2511 75.00
11:15 12:4511 90.001
2
I 12:40 14:3011 110.00
12:25 14:2011 115.00
12:45 14:4011 115.001
3
Average AT
I 14:30 17:4011 190.00114:201117:2011
128.33
180.00
123.33
14:401117:4511 185.001
130.00
Value
Average AT/4 =
[Hole No.1] I 32.081(T1)
Average AT/4 =
[Hole No.2] I 30.831(T2)
Average AT/4 =
[Hole No.31 32.501(T3'
Result of Test: Surface Percolation Value = 31.811 (min/25 mm)
Comments:
'he topsoil at this site is of fair quality and may be used to form a raised mound soil percolation area to polish treated effluent from an
dvanced treatment system.
Step 5: Modified Method (where T100> 210 minutes)
Percolation
Test Hole No. 1
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
=1-r /K1,
300 - 250 8.1 0.00 l
250 - 200 9.7 00 0.00 l�
200- 150 11.9 =� 0.0011�
150-100 14.1 0� 0.00111=
Average T- Value T- Value Hole 1 = (T, ) 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
=1-, hh:mm hh:mm (mins) IT,, =4.45
T,
300- 250 8.1 I= 0.0011
250 - 200 9.7 �0 0.0011=
200- 150 I11.911 0.00 I_
150 - 100 14.1 00 0.00 =�
Average T- Value T- Value Hole 2 = (12) I0.00
Result of Test: Surface Percolation Value =
I 0.00 (min/25 mm)
Fall of water Time Start Finish Time K,, T- Comments:
in hole (mm) Factor Time Time of fall = T, Value
=T, hh:mm hh:mm (mins) /T, =4.45
=T /K„
300 - 250 I 8.1 � 0.00
250 - 200 9.7 0� �
0.00 �
200- 150 11.9 0 �I
0.00
150- 100 14.1 =� 1
0.00 1 ______
Average T- Value T- Value Hole 3 = (T2) I 0.00
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: 1:18
Are all minimum separation distances met? I //
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: 31.81 Sub -surface: 45.27
Not Suitable for Development II Suitable for Development Q
Identify all suitable options
Septic tank system (septic tank and
No
percolation area) (Chapter 7)
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)
Discharge Route'
Groundwater
Propose to install: Secondary Treatment System and soil polishing filter aEl I
nd discharge to: Ground Water
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 raised mound soil polishing filter measuring 1.0m in height to be installed and constructed
to EPA 2021 specifications. The raised mound is required due to the high clay content in the subsoil. The raised mound shall
be made up of 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 raised percolation area shall measure 13m x 13m and may be
landscaped into the contours of the site. 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
raised mound 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 "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.
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: rBiolabs 1
Prefix: Mr 0 First Name: Michael Surname: Holohan
Address:
ITERERA, SCOTSTOWN, CO. MONAGHAN
Qualifications/Experience: GSI / EPA CERTIFIED
Date of Report: 12 -Jun -2026
Phone: P 0868169162 E-mail biolabsirl@outlook.com
Indemnity Insurance Number: _ RPl-IE000946-00I
Signature:___—
e
1
1TE
VULNERABILITY LOW
3T6
BEDROCK DMSSL
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)
o
RIVERS AND LAKES
. S'TE
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AERIAL VIEW OF PERCOLATION SITE
SKETCH OF PERCOLATION AREA INCLUDISITE SURROUNDS
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VIEWS OF PERCOLATION SITE
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TRIAL HOLE ON DAY OF EXCAVATION
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TRIAL HOLE TWO DAYS AFTER EXCAVATION
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T3
T TEST HOLES
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P 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
on the mound feeding the 6 percolation trenches. The raised mound shall be
1.0m in height throughout its area and consist of the topsoil from the site. The
mound shall measure 13m x 13m.
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 raised mound
soil polishing filter and not closer than 2m to divert surface water away
from it and stop the water table rising in 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
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 6.31 EPA Code of Practice 2021 unless stated otherwise
GEOTEXTILE LAYER
TOPSOIL
100MM
150MM WASHED
STONE ABOVE PIPE
O 100MM PIPE
250MM WASHED
STONE BELOW PIPE
SUITABLE SUBSOIL
MINIMUM 0.9M
Water table
EACH TRENCH 500MM WIDE
0.6M
INVERT OF TRENCH
MOUNDED TOPSOIL 1.0M
GROUND LEVEL
SECTION THROUGH MOUNDED SUBSOIL PERCOLATION SYSTEM