HomeMy WebLinkAbout2644 - Site Assessment ReportEYffi
FOR
SIOBHAN HEGARTY,
CARROWHATTA,
SCOTSTOWN,
CO MONAGHAN.
D r t 'fMENT
MONAG IAN Co. COUP'' I
ca
PLANN N CTON
02 JUN 2020
APPENDIX A: SITE CHARACTERISATION FORM
File Reference: Siobhan Hegarty, Carrowhatta, Scotstown.
Prefix: Ms First Name: Siobhan ISurname: Hegarty
Address: Site Location and Townland:
Carrowhatta, Scotstown, Co Monaghan. Carrowhatta, Scotstown., Co Monaghan.
Number of Bedrooms: I1 Maximum Number of Residents: 14
Comments on population equivalent
There is 1 double bedrooms which will equate to two adults.
Proposed Water Supply:
Mains Private Well/Borehole LII
Soil Type, (Specify Type):
Subsoil, (Specify Type):
Bedrock Type: DSL
Alluvium Alluv A
Alluvium A / Limestone till TLs
Group Well/Borehole
Aquifer Category: Regionally Important I Locally Important LI Poor
Vulnerability: Extreme High Moderate liiLow ❑✓
Groundwater Body: Tydavnet Status Good
Name of Public/Group Scheme Water Supply within 1 I<m: Tydavnet GWS
Source Protection Area: ZOC SI SO Jj Groundwater Protection Response: R1 0
Presence of Significant Sites
(Archaeological, Natural & Historical):
Past experience in the area:
None
Ring fort 241 m West South-West
Comments:
(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. This site characterisation report is for an existing wood cabin on the site.
Note: Only information available at the desk study stage should be used in this section.
3.1 Visual Assessment
Landscape Position:
Elevated near base of Westerly facing slope.
Slope: Steep (>1:5) Shallow (1:5-1:20) ✓� Relatively Flat (<1:20) LII
Slope Comment ABOUT 1: 12 1
Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres)
Houses:
Cabin on the site for which this report is for. Home dwelling house 95m South South-West. Dwelling house 45m East, 58m
North-East and 95m South-West.
Existing Land Use:
Wasteland
Vegetation Indicators:
Grass and shrubs.
Groundwater Flow Direction
Ground Condition:
Expected West
Firm during a spell of unsettled weather with occasional rainfall.
Site Boundaries:
Mature hedges all around.
3.1 Visual Assessment (contd.)
Roads:
Local road 100m South.
Outcrops (Bedrock And/Or Subsoil):
None
Surface Water Ponding:
None
Lakes:
Duff lough 376m East.
Beaches/Shellfish Areas:
None
Wetlands:
None
Karst Features:
None
Watercourses/Streams:*
Scotstown river 363m West.
*Note and record water level
3.1 Visual Assessment (contd.)
Drainage Ditches:"
No ditch within 50m.
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 unsettled weather with occasional rainfall.
This site characterisation report is for an existing cabin on the site.
*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): I 2.1
Depth from ground surface Depth from ground surface
to bedrock (m) (if present): to water table (m) (if present): 1.9
Depth of water ingress: I 0.21 Rock type (if present): Iwone _ I
Date and time of excavation: 28 -Apr -2026 16:00 Date and time of examination: 30 -Apr -2026 09:00
Depth of
Surface and
Subsurface Soil/Subsoil
Percolation Texture & Plasticity and Soil Density/ Colour**** Preferential
Tests Classification ±* dilatancy*** Structure Compactness flowpaths
0.1 m II
0.2 m lI
0.3 m lI
0.4 m LIIII__]
0.5m C1J
0.6m L_I
0.7m
0.8m ISS
0.9m 0
1.0 m
1.1m lI
1.2m 0
1.3m I
1.4m I
1.5m1
1.6m ]
1.7m II
1.8m I
1.9m 0
2.Om lI
2.lmlO
2.2 m 0
2.3m I
2.4 m l-
2.5m 0
2.6m Fl
2.7m F
2.8m
2.9 m iI
3.0m lI
3.1m I
3.2m 0
3.3 m 0
3.4m1___
3.5 m
SILT / CLAY 3 threads —60mm CRUMB SOFT BROWN GRASS ROOTS
TOP SOIL ribbons — dilatant
ALLUVIUM 2 Threads - 50mm
SUB SOIL ribbons - dilatant GRANULAR SOFT CREAM NONE
SILY / CLAY
SUBSOIL
Base of trial hole 2.1 m
2 threads - 50mm
ribbons - dilatant
Likely Subsurface Percolation Value: __ 35
Likely Surface Percolation Value: I 25
BLOCKY
UNCOMPACT
GREY
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 he tested for each horizon and results should be entered above for each horizon.
'.•. All signs of mottling should be recorded.
NONE
3.2 Trial Hole (contd.) Evaluation:
The trial hole was 2.1 m deep with three distinct layers. Top -soil that was crumb in nature and below that alluvium sub -soil that
was cream in colour and granular in nature and below that sub -soil that was blocky in nature and grey in colour. The water
table was at 1.9m.
3.3(a) Subsurface Percolation Test for Subsoil
Step 1: Test Hole Preparation
Percolation Test Hole 1 2
Depth from ground surface I 400 400 I 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
[length x breadth (mm)] 300 x 300 300 x 300 280 x 280
Step 2: Pre -Soaking Test Holes
Pre-soak start Date 28 -Apr -2026 28 -Apr -2026 I 28 -Apr -2026
Time I 17:301 17:301 I 17:30
2nd pre-soak Date 29 -Apr -2026 29 -Apr -20261 29 -Apr -2026
start Time
14:40 I 14:40 14:40
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring 1100
Percolation Test Hole No. 1 2 3
Date of test 30-04-2026 30-04-2026 30-04-2026
Time filled to 400 mm 09:0011 09:0011 09:00
Time water level at 300 mm I 09:50 09:55!! 09:50
Time (min.) to drop 100 mm (T1.) I 50.00 55.00 1 50.001
Average T100 51.67
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 1100 > 210 minutes then go to Step 5;
Step 4: Standard Method (where T,00 ≤ 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
(at 300 (at 200
(at 300 (at 200
mm) mm)
mm) mm)
mm) mm)
1
I 09:50
10:5011
60.00
09:55
11:1011 75.00
09:50
10:4011
50.00
2 10:50 12:3011 100.00 11:10 13:1011 120.00 10:40 12:1511 95.00
3 12:30 15:25 175.00 13:10 16:4011 210.00 12:15 15:0011 165.00
Average At 111.67 135.00 103.33
Value
Average At/4 = I Average At/4 = I Average At/4 =
[Hole No.1] 27.921(t1) [Hole No.2] 33.751(t2) [Hole No.3] I 25.831(t3)
Result of Test: Subsurface Percolation Value = 29.171 (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.
Percolation
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
(mins)
/ T.
= 4.45
= T,
hh:mm
hh:mm
(mins)
/ T,
= 4.45
= T
1K,,
=T
1K,.
300 - 250
8.1
==(
0.0011
300- 250
8.1
��
0.00
i�
250- 200
9.7
OLD
0.00
��
250-200
9.7
0
0.0011�
200 - 150
11.9
=�
0.0011
200 - 150
11.911
0.00
=C
150 - 100
14.1 0=
0.00
��
150- 100
14.1
$�
0.00
!
C
Average I T- Value T- Value Hole 1 =(T1) 0.00
Percolation
Test Hole No. 3
Average I T- Value T- Value Hole 2 = (T2) 0.00
Result of Test: Subsurface Percolation Value =
I_0.00!(min/25 mm)
Fall of water Time Start Finish Time K,, T- Comments:
in hole (mm) Factor Time Tim§e of fall = T, Value
= T, hh:mm hh:mm (mins) /T = 4.45
/K„
300 - 250 8.1 == 0.00 l
250 - 200 9.7 == 0.00 I
I
200 - 150 11.9 = 0.00
150- 100 14.1 FI= ��
0.00 [_I I
Average T- Value T- Value Hole 3 = (T2) 0.00
■G
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 400 400 400
to base of hole (mm)
Depth of hole (mm) 400 400 400
Dimensions of hole
17���3oo
300 x 280280 x 280[length x breadth (mm)]
Step 2: Pre -Soaking Test Holes
Pre-soak start Date
Time
2nd pre-soak Date
start Time
28 -Apr -2026
17:35
29 -Apr -2026
14:45
28 -Apr -2026
17:35
29 -Apr -2026
14:45
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring T100
28 -Apr -2026
17:35
29 -Apr -2026
14:45
1 2 3
Percolation Test Hole No.
II II
Date of test 30 -Apr -26 I 30 -Apr -26 30 -Apr -2026
Time filled to 400 mm 09:05 IL 09:05 09:05
Time water level at 300 mm 09:55 IL 09:55 10:15
Time to drop 100 mm (T,00) 1 50.00 50.00 70.00
Average T100 56.67
If T100 > 480 minutes then Surface Percolation value >90 - site unsuitable for discharge to ground
If T1 ≤ 210 minutes then go to Step 4;
If T1D0 > 210 minutes then go to Step 5;
Step 4: Standard Method (where T,00 ≤ 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
(at 300 (at 200
(at 300 (at 200
mm) mm)
mm) mm)
mm) mm)
1
09:55 10:50 55.00
09:55 11:0011 65.00
10:15!!11:30 75.00
2
10:50 11:5511 65.00
11:00 12:2011 80.00
11:30 12:5511 85.001
311:55jIi�fl
115.00
12:20 14:2011 120.00
12:55 15:2011 145.00
Average AT
101.67
78,33
88.33
Value
Average AT/4 = Average AT/4 = Average AT/4 =
_
[Hole No.11 L 19.581(T1) [Hole No.2] I 22.08 (T2) [Hole No.3] 25.421(T3)
Result of Test: Surface Percolation Value = 22.36 (min/25 mm)
Comments:
The topsoil at this site is of good quality and may be used to level up the percolation area. The surface P tests were carried out on a large
mound of good
quality top -soil at the site which will be perfect for leveling up the percolation area which is on a slope.
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,s T - Fall of water Time Start Finish Time Kos 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 (mins) / T = 4.45 = T, hh:mm hh:mm (mins) / T = 4.45
=T =T /K,.
300 - 250 I 8.1 Du 0.00 0I 300 - 250 8.1 �� 0.00 0=
250 - 200 9.7 � 0.00 �� 250 - 200 9.7 =I� 0.00 ==
200 - 150 11.9 � 0.00 =� 200 - 150 11.9 =� 0.00 ==
150 - 100
14.1 00 0.00!!I 150 -100 14.1 =0 0.00 =______
Average
T- Value T- Value Hole 1 = (T1) 0.00 Average T- Value T- Value Hole 2 = (12) 0.00
Result of Test: Surface Percolation Value =
Percolation
Test Hole No.
3 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
300 - 250 8.1 =� 0.00I=O
250 - 200 9.7 00 0.00
_
11.9 =� 0.00 0
200-150 �
150- 100 14.1 [ � 0.00 fIF______
Average T- Value T- Value Hole 3 = (1Z) 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: 1:121
Are all minimum separation distances met? I 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: 22.36 Sub -surface: I 29.17
Not Suitable for Development LI Suitable for Development Q
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
Discharge Route'
Groundwater
Propose to install: Secondary Treatment System and soil polishing filter
and 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 soil polishing filter to be installed and constructed to EPA 2021 specifications. I recommend
20m of percolation trench in the soil polishing filter consisting of 2 lengths of trench each measuring 1 Om. 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 12m x 5m. Ensure that the final effluent from the mechanical aeration system is
distributed evenly to each of the two 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 "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 (m�') Percolation Area
Mounded Percolation Area
No. of Trenches
0 No. of Trenches 0
Length of Trenches (m)
L 6.001 Length of Trenches (i n)
Invert Level (m)
0.601 Invert Level (m) _________
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 2
Constructed Wetland 1 I I
Sizing of Primary Compartment
Other _________
2.301 m
Polishing Filter*: (Section 10.1)
Surface Area (m2)* 9.00
Option 3 - Gravity Discharge I 18.00
Trench length (m)
Option 1 - Direct Discharge
Surface area (m2) I
Option 4 - Low Pressure �
Pipe Distribution L�
Option 2 - Pumped Discharge
Trench length (rn)
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/m2.d)
L 33.00 Surface area (rn2) 9.00
Surface Water'* Discharge Rate (m3/hr)
0.01
* 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 ₹o so
as to ensure that the system continues to function properly.
Company: Biolabs 1
Prefix: Mr 0 First Name: Michael Surname: Holohan
Address:
Iterera, Scotstown, Co Monaghan.
Qualifications/Experience: IGSI / EPA CERTIFIED
Date of Report: 01 -May -2026
Phone: 0868169162, E-mail biolabsiri@outlook.com
Indemnity Insurance Number: _ RPI-IE000946-001
Signature:
6 ,T&
RIVERS AND LAKES
AQUIFER CATEGORY LI
VULNERABILITY LOW
BEDROCK DSL
<,tath
1 u it11, 111
All Chlllt hill
I 111,11
Bdile all
Scotaiyh
An tthothac Is
WELLS AND BOREHOLES ADJACENT TO THE SITE
II Public Supply Source Protection Areas
SI-Inner Protection Area
SO -Outer Protection Area
1 .1 <II F is hill. Sra!I;
l. llchu111r. t.I .utnIn
ul An Lhulch,iitl �l rC
lbias
�• thtl' — — %
Tha1r �I/
Balle an
Scotalgh - ``
An Nhuthach lr_
J:=
ti
SOURCE PROTECTION DATA (N/A)
I
r
7/cho
r '
11/ / c T
LIM
fly�
f t y _ •�1 J1.}'k � � 1 , h Yk s, `: •'1-
s � �i.
.x F / / 4
i'• j&_,
� R
AERIAL VIEW OF PERCOLATION SITE
TN
i4Tt4kE I.
-rAJAL
•12Q � s 6-
TQ5 tip
z4&E
o'P1
®P3
IDS � V/
Rpm
SKETCH OF PERCOLATION AREA INCLUDING SITE SURROUNDS
n�iju 1
k'!
'4 ', : " -'
E< et 7 �r�c �' t 7 t,"► ra 1ii Ii
yr y. L y s
VIEW OF PERCOLATION SITE
-._ ---tom
i F»�i
r ? ,
f tom'.
{� -� `' .� Wit"' 'ii„lrL.Lrt�� �'� .�F.�i e.t-l� 5�'-Jw \• �k fl
CABIN FOR WHICH SITE CHARACTERISATION REPORT IS FOR
TRIAL HOLE ON DAY OF EXCAVATION
TRIAL HOLE TWO DAYS AFTER EXCAVATION
Ti T2
T3
T TEST HOLES
:r
�Ir+ �(kt
'
4.
h
'.,r�
P1
P2
P3
P TEST HOLES
OUTLINE SPECIFICATIONS FOR MOUNDED SOIL POLISHING FILTER
1. Treated effluent from the mechanical aeration sump unit shall be pumped
intermittently to the distribution chamber feeding the 3 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 3 percolation trenched shall be 6m. Total length
18m.
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 ground
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 should 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
U) 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