HomeMy WebLinkAbout2660372 - Site assessment report
SITE CHARACTERISATION REPORT
in accordance with
EPA Code of Practice DWWTS 2021
Proposed dwelling at:
Cornahoe
Ballybay
Co. Monaghan
Prepared by :
Audrey Ruxton
On Behalf of Ruxton Architectural Services Ltd.
August 2026
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2.0 GENERAL DETAILS (From planning application)
Soil Type, (Specify Type):
Subsoil, (Specify Type):
Bedrock Type:
Aquifer Category: Regionally Important Locally Important Poor
Vulnerability: Extreme High Moderate Low
Groundwater Body: Status
Name of Public/Group Scheme Water Supply within 1 km:
Source Protection Area: ZOC SI SO Groundwater Protection Response:
Presence of Significant Sites
(Archaeological, Natural & Historical):
Past experience in the area:
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).
Note: Only information available at the desk study stage should be used in this section.
APPENDIX A: SITE CHARACTERISATION FORM
File Reference:
1.0 GENERAL DETAILS (From planning application)
Prefix: First Name: Surname:
Address: Site Location and Townland:
Number of Bedrooms: Maximum Number of Residents:
Comments on population equivalent
Proposed Water Supply:
Mains Private Well/Borehole Group Well/Borehole
Mr Michael McManus
Corveen, Donegal Town Cornahoe, Ballybay Co Monaghan XXIV - 2
4 6
The proposed dwelling of 4 bedrooms, a PE of 6.
4
Surface water Gleys, Ground water Gleys.
TLPSsS – Till derived from Palaeozoic Sandstones & Shales.
LAan Aghnamullen member - Thin turbidite & silt/mudstone
Pl
4
IE NW G061 Cavan
Monaghan CoCo Killkit Supply
R1
Monument No. MO024-002 Ringfort in Townland, not in vicinity of site.
No known issues with existing systems in area.
Low density of systems in area.
The groundwater vulnerability is classified as High.
Groundwater Protection Response is classified as R1 - Acceptable subject to normal good practice.
Proceed with on-site assessment.
Good
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3.0 ON-SITE ASSESSMENT
3.1 Visual Assessment
Landscape Position:
Slope: Steep (>1:5) Shallow (1:5-1:20) Relatively Flat (<1:20)
Slope Comment
Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres)
Houses:
Existing Land Use:
Vegetation Indicators:
Groundwater Flow Direction:
Ground Condition:
Site Boundaries:
General topography is low rolling drumlin, site level to public road.
4
Suitable
Existing dwelling on site to be demolished and replaced.
Existing septic tank & percolation area to be decommissioned.
Low density dwellings in area.
The proposed new dwelling with 4 bedrooms (PE 6) should not result in excessive cumulative nutrient loading.
Agricultural
Grass.
Northwesterly direction.
Dry underfoot and dry weather.
Fence, walls & h`edgerow with trees and timber fence.
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3.0 ON-SITE ASSESSMENT
3.1 Visual Assessment (contd.)
Roads:
Outcrops (Bedrock And/Or Subsoil):
Surface Water Ponding:
Lakes:
Beaches/Shellfish Areas:
Wetlands:
Karst Features:
Watercourses/Streams:*
*Note and record water level
Local tertiary road L32002 to front to Ballybay/Lough Egish.
None present.
Dry underfoot.
None in vicinity of site.
None present.
None
None present.
Stream to rear boundary field >200m
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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).
*Note and record water level
3.0 ON-SITE ASSESSMENT
3.1 Visual Assessment (contd.)
Drainage Ditches:*
Springs:*
Wells:*
None present.
None.
None existing or proposed.
Potential suitability of the site.
The visual assessment would indicate the site to be suitable.
Potential targets at risk.
Groundwater potential target.
All appropriate separation distances are achievable.
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3.2 Trial Hole (should be a minimum of 2.1m deep (3m for regionally important aquifers))
Depth of trial hole (m):
Depth from ground surface Depth from ground surface
to bedrock (m) (if present): to water table (m) (if present):
Depth of water ingress: Rock type (if present):
Date and time of excavation: Date and time of examination:
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
0.3 m
0.4 m
0.5 m
0.6 m
0.7 m
0.8 m
0.9 m
1.0 m
1.1 m
1.2 m
1.3 m
1.4 m
1.5 m
1.6 m
1.7 m
1.8 m
1.9 m
2.0 m
2.1 m
2.2 m
2.3 m
2.4 m
2.5 m
2.6 m
2.7 m
2.8 m
2.9 m
3.0 m
3.1 m
3.2 m
3.3 m
3.4 m
3.5 m
Likely Subsurface Percolation Value:
Likely Surface Percolation Value:
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.
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.
2.3
2.2 0
0 Shale
04-Aug-2026 10:00 04-Aug-2026 10:30
Topsoil
_________________
Clay & shale.
_________________
2+ threads, dilates
with difficulty
_______________
_______________
Crumb
____________
Loose
____________
Uncompact
___________________
Uncompact
____________________
Brown
___________
Brown
Grey
___________
None
__________________
None
____________________
20
15
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3.3(a) Subsurface Percolation Test for Subsoil
x x x
3.2 Trial Hole (contd.) Evaluation:
Step 1: Test Hole Preparation
Percolation Test Hole 1 2 3
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
Pre-soak start Date
Time
2nd pre-soak Date
start Time
2 3
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring T100
Percolation Test Hole No. 1
Date of test
Time filled to 400 mm
Time water level at 300 mm
Time (min.) to drop 100 mm (T100 )
Average T100
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;
No Water observed in trial hole after 24 hours.
800
1,200
400
800
1,200
400
800
1,200
400
300 300 300 300 300 300
04-Aug-2026
12:00
05-Aug-2026
09:00
04-Aug-2026
12:00
05-Aug-2026
09:00
04-Aug-2026
12:00
05-Aug-2026
09:00
06-08-2026
09:00
09:55
55.00
06-08-2026
09:00
09:50
50.00
06-08-2026
09:00
09:48
48.00
3 51.00
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Result of Test: Subsurface Percolation Value =
(min/25 mm)
Step 4: Standard Method (where T100 ≤ 210 minutes)
Percolation
Test Hole 1 2 3
Fill no. Start Finish ∆t (min) Start Finish ∆t (min) Start Finish ∆t (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
2
3
Average ∆t
Value
Average ∆t/4 = Average ∆t/4 = Average ∆t/4 =
[Hole No.1](t1) [Hole No.2](t2) [Hole No.3](t3)
Result of Test: Subsurface Percolation Value = (min/25 mm)
Comments:
Comments:
Percolation
Test Hole No.1
Fall of water Time Start Finish Time Kfs T –
in hole (mm) Factor Time Time of fall = Tf Value
= Tf hh:mm hh:mm (mins) / Tm = 4.45
= Tm / Kfs
300 - 250 8.1
250 - 200 9.7
200 - 150 11.9
150 - 100 14.1
Average T- Value T- Value Hole 1 = (T1 )
Step 5: Modified Method (where T100 > 210 minutes)
Percolation
Test Hole No.2
Fall of water Time Start Finish Time Kfs T –
in hole (mm) Factor Time Time of fall = Tf Value
= Tf hh:mm hh:mm (mins) / Tm = 4.45
= Tm / Kfs
300 - 250 8.1
250 - 200 9.7
200 - 150 11.9
150 - 100 14.1
Average T- Value T- Value Hole 2 = (T2 )
Percolation
Test Hole No.3
Fall of water Time Start Finish Time Kfs T –
in hole (mm) Factor Time Tim§e of fall = Tf Value
= Tf hh:mm hh:mm (mins) / Tm = 4.45
= Tm / Kfs
300 - 250 8.1
250 - 200 9.7
200 - 150 11.9
150 - 100 14.1
Average T- Value T- Value Hole 3 = (T2)
09:55 10:50 55.00
10:55 11:55 60.00
11:55 13:00 65.00
60.00
15.00
09:50 10:45 55.00
10:45 11:40 55.00
11:40 12:40 60.00
56.67
14.17
09:48 10:40 52.00
10:40 11:35 55.00
11:35 12:30 55.00
54.00
13.50
3
14.22
The subsurface percolation results good percolating properties in the subsoil, and are within the acceptable range.
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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
to base of hole (mm)
Depth of hole (mm)
Dimensions of hole
[length x breadth (mm)]
Step 2: Pre-Soaking Test Holes
Pre-soak start Date
Time
2nd pre-soak Date
start Time
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
Time filled to 400 mm
Time water level at 300 mm
Time to drop 100 mm (T100 )
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;
x x x
0
400
400
0
400
400
0
400
400
300 300 300 300 300 300
04-May-2026
12:15
05-May-2026
09:15
04-May-2026
12:30
05-May-2026
09:15
04-May-2026
12:30
05-May-2026
09:15
06-May-26
09:30
10:20
50.00
06-May-26
09:30
10:30
60.00
06-May-2026
09:30
10:20
50.00
53.333
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Step 4: Standard Method (where T100 ≤ 210 minutes)
Percolation
Test Hole 1 2 3
Fill no. Start Finish ∆T (min) Start Finish ∆T (min) Start Finish ∆T (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
2
3
Average ∆T
Value
Average ∆T/4 = Average ∆T/4 = Average ∆T/4 =
[Hole No.1](T1 ) [Hole No.2](T2 ) [Hole No.3](T3 )
Result of Test: Surface Percolation Value = (min/25 mm)
Comments:
(min/25 mm)
Comments:
Percolation
Test Hole No.1
Fall of water Time Start Finish Time Kfs T –
in hole (mm) Factor Time Time of fall = Tf Value
= Tf hh:mm hh:mm (mins) / Tm = 4.45
= Tm / Kfs
300 - 250 8.1
250 - 200 9.7
200 - 150 11.9
150 - 100 14.1
Average T- Value T- Value Hole 1 = (T1 )
Step 5: Modified Method (where T100 > 210 minutes)
Percolation
Test Hole No.2
Fall of water Time Start Finish Time Kfs T –
in hole (mm) Factor Time Time of fall = Tf Value
= Tf hh:mm hh:mm (mins) / Tm = 4.45
= Tm / Kfs
300 - 250 8.1
250 - 200 9.7
200 - 150 11.9
150 - 100 14.1
Average T- Value T- Value Hole 2 = (T2 )
Result of Test: Surface Percolation Value =
Percolation
Test Hole No.3
Fall of water Time Start Finish Time Kfs T –
in hole (mm) Factor Time Time of fall = Tf Value
= Tf hh:mm hh:mm (mins) / Tm = 4.45
= Tm / Kfs
300 - 250 8.1
250 - 200 9.7
200 - 150 11.9
150 - 100 14.1
Average T- Value T- Value Hole 3 = (T2)
10:20 11:15 55.00
11:55 12:50 55.00
12:50 13:50 60.00
56.67
14.17
10:30 11:30 60.00
11:30 12:30 60.00
12:30 13:35 65.00
61.67
15.42
10:20 11:10 50.00
11:10 12:05 55.00
12:05 13:00 55.00
53.33
13.33
14.31
The surface percolation results would indicate good percolating properties and are within the acceptable range.
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3.4 The following associated Maps, Drawings and Photographs should be appended to this site
characterisation form.
1 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.
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 layout1
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.
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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:
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)
Percolation test result: Surface: Sub-surface:
Not Suitable for Development Suitable for Development
Identify all suitable options Discharge Route 1
1.Septic tank system (septic tank and
percolation area) (Chapter 7)
2.Secondary Treatment System
(Chapters 8 and 9) and soil polishing filter
(Section 10.1)
3.Tertiary Treatment System and Infiltration /
treatment area (Section 10.2)
4.0 CONCLUSION of SITE CHARACTERISATION
5.0 SELECTED DWWTS
Propose to install:
and discharge to:
Invert level of the trench/bed gravel or drip tubing (m)
Site Specific Conditions (e.g. special works, site improvement works testing etc.
1 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.
1:200
4
1.20
14.00 14.00
4
No
Yes
No
Groundwater.
Secondary Treatment System and soil polishing filter
Ground Water
In accordance with Table EPA CoP DWWTS 2021, the T/P results achieved are in the range 3-90.
It is proposed to Install Secondary Agreement approved Domestic Waste Water Treatment System and discharge to instu soil
polishing filter constructed as per detail on layout plan.
See site layout plan.
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SYSTEM TYPE: Septic Tank Systems (Chapter 7)
Tank Capacity (m3) Percolation Area Mounded Percolation Area
No. of Trenches No. of Trenches
Length of Trenches (m) Length of Trenches (m)
Invert Level (m) 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
Soil Capacity PE
Constructed Wetland Sizing of Primary Compartment
Other m3
Polishing Filter*: (Section 10.1)
Surface Area (m2)*
Option 1 - Direct Discharge
Surface area (m2)
Option 2 - Pumped Discharge
Surface area (m2)
DISCHARGE ROUTE:
Groundwater Hydraulic Loading Rate * (l/m2.d) Surface area (m2)
Surface Water ** Discharge Rate (m3/hr)
6.0 TREATMENT SYSTEM DETAILS
* Hydraulic loading rate is determined by the percolation rate of subsoil
** Water Pollution Act discharge licence required
Identify purpose of tertiary
treatment
Option 3 - Gravity Discharge
Trench length (m)
Option 4 - Low Pressure
Pipe Distribution
Trench length (m)
Option 5 - Drip Dispersal
Surface area (m2)
SYSTEM TYPE: Tertiary Treatment System and infiltration / treatment area (Section 10.2)
Provide performance information
demonstrating system will provide
required treatment levels
Provide design information
Approved BAF/SAF
6
3.00
10.00
4 900.00
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Company:
Prefix: First Name: Surname:
Address:
Qualifications/Experience:
Date of Report:
Phone: E-mail
Indemnity Insurance Number:
Signature: ________________________________________
7.0 SITE ASSESSOR DETAILS
6.0 TREATMENT SYSTEM DETAILS
QUALITY ASSURANCE:
Installation & Commissioning
On-going Maintenance
To be commissioned by supplier & installation supervised by a suitably qualified person.
Annual maintenance as per manufacturers instruction.
Ruxton Architectural Services Ltd.
Ms Audrey Ruxton
On behalf of Ruxton Architectural Services Ltd.
Corgreagh, Shercock, Co. Monaghan
BEng (Hons) Env, MIEI, FETAC SSA, Dip. IOA
11-Aug-2026
0429669002 audrey@ruxtonarchitectural.com
PQ0727190
Audrey Ruxton Digitally signed by Audrey Ruxton
Date: 2026.08.31 11:09:56 +01'00'
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Site Characterisation Report – Proposed dwelling at Cornahoe, Ballybay, Co. Monaghan
Groundwater Vulnerability: High
Bedrock Geology :- LAan Aghnamullen member
Thin turbidite & silt/mudstone
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Site Characterisation Report – Proposed dwelling at Cornahoe, Ballybay, Co. Monaghan
Groundwater Aquifer – PI Poor Aquifer - Bedrock which is Generally Unproductive
except for Local Zones
Teagasc Soil : Surface water Gleys, Ground water
Gleys. Sandstone and shale till (Lower Palaeozoic)
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Site Characterisation Report – Proposed dwelling at Cornahoe, Ballybay, Co. Monaghan
Subsoil: TLPSsS – Till derived from lower Palaeozoic Sandstone & Shales
Till derived from lower PalgfTLPSs
Discovery Series Map
Site
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Site Characterisation Report – Proposed dwelling at Cornahoe, Ballybay, Co. Monaghan
Site
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Site Characterisation Report – Proposed dwelling at Cornahoe, Ballybay, Co. Monaghan
Trial Pit Site
Subsurface Holes Surface Holes
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SITE LAYOUT PLAN
TEL. 086-8041690
1:500
CORNAHOE, BALLYBAY, Co. MONAGHAN.
PROPOSED SINGLE STOERY DWELLING AT
CORGREAGH
SHERCOCK
CO. MONAGHAN
P. Ruxton
25-1391-02
24/7/'2026Michael Mc Manus
SV
150.11
150.15
150.14
150.19
150.18
150.14
150.17
150.23
150.23
150.24
150.22
150.19
150.17
150.15
150.09
150.05
150.12
150.11
MRK
SV
POST
POST
149.07
149.15
149.16
149.28
149.30
149.25
149.35
149.44
149.43
149.50
149.48
149.53
149.47
149.74
149.72
149.68
149.82
149.79
149.87
149.84
149.98
150.00
149.94
149.74
149.68149.68 149.74
149.86
149.92
TP
POST
POST POST POST
TP
MRK
149.65149.65149.77
149.45149.53149.65
149.57 149.42149.41
149.31
149.36149.52
149.27
149.21
149.23
149.27
149.17
149.13
149.21
148.98
148.73
149.18
149.17
148.76 POST
148.93
148.70
148.74 148.98
149.01
148.64
148.37
148.48
148.83
148.60
148.42
148.69
148.55
148.66
148.69
148.88
148.97
148.72
148.74
148.85
148.64
148.66
148.51
148.19
148.29
148.10
148.00
148.26
148.48 148.58
148.64 148.54
148.46
148.33
148.28
147.93147.81 148.03
147.51
147.41
147.24
147.09
147.05146.90 147.21
147.55
147.13
147.28
147.70
147.41
147.39
147.67
147.91
148.15
148.16
147.94
148.12148.08
148.17
148.27
148.22
148.34
CL=148.32
148.00
147.38
146.86
146.34
145.60
148.15
148.61
148.89
149.24
149.48
149.56
149.68
149.79
149.93
149.93
149.74
149.59
149.55
149.62 149.62
149.57
149.44149.36
149.02
149.25
149.45
149.33
149.08
148.92
146.55
145.18
145.69
145.70
146.84
146.82
145.44
145.68
145.89
CL=143.07
145.77
145.81
146.47
146.54
146.80
147.49
147.25
147.21147.72
148.05
147.97
148.08
148.11
148.13
147.75
147.95
POST
148.10
148.23 148.50
148.85148.42
148.72
148.94
149.56
IS1
148.97
IS2
149.56
EP
FENCE
FENCE
EIR OVERHEAD
FENCE
WALL FENCE
WALL
WA
L
L
WA
L
L
WA
L
L
S/WIR
E
WALL
WALL
WA
L
L
DR
I
N
K
E
R
FENC
E WAL
L
FE
N
C
E
145.5
145.5
145.5
146.0
146.0
146.5
146.5
147.0
147.0
147.5
147.5
148.0
148.0
148.5
149.0
149.5
149.5
147.31
148.14
FL=148.23
RL=152.23EL=150.80
RL=153.73EL=152.10
RL=152.20EL=151.00
WA
L
L
OS XXIV - 2
N
GEOTEXTILE
DISTRIBUTION
PIPE
BASE OF THE
PERCOLATION
TRENH
UNSATURATED
SUITABLE SOIL
GRAVEL
GRAVEL
TOPSOIL
GROUND LEVEL
SECTION OF A PERCOLATION TRENCH
NOTE 1.
NATIVE TREE MIX:SIZE @ PLANTING SIZE IN 2 YEARS SIZE IN 5 YEARS SIZE @ MATURITY
CHESTNUT 3m 4.5/5m 6/8m >12m
MAPLE 3m 4m 6/7m >12m
COMMON OAK 3m 4m 6/7m >12m
BEECH 3m 4.5/5m 7/8m >12m
COMMON ASH 3m 4.5/5m 6/8m >12m
FlOWERING CHERRY 3m 4.5m 5/6m >12m
BIRCH 3m 4.5/5m 7/8m >12m
HAWTHORN 3m 4m 5m >6m
Note:NATIVE TREES TO BE PLANTED AT APPROX. 6-9m CENTERS
NATIVE HEDGE MIX:SIZE @ PLANTING SIZE IN 2 YEARS SIZE IN 5 YEARS SIZE @ MATURITY
WHITETHORN 0.6/0.9m 2m 2.5m 3m
BEECH 0.6/0.9m 2m 2.5m 3m
FIELD MAPLE 0.6/0.9m 2m 2.5m 3m
BLACKTHORN 0.6/0.9m 2m 2.5m 3m
HORNBEAM 0.9/1.2m 2m 2.5m 3m
HOLLY 0.4/0.6m 2m 2.5m 3m
Note: SPECIES TO BE PLANTED AT A RATE OF 5 PLANTS PER LINEAR METER.
148.34
REC
E
I
V
E
D
:
0
7
/
0
9
/
2
0
2
6