HomeMy WebLinkAbout2570 - F.I. Received Doc. No 2SITE IMPROVEMENT REPORT
ON COMPLETED RAISED MOUND
FOR
LYNSKY,
ACRES,
KNOCKATALLON,
CO. MONAGHAN.
APPENDIX A: SITE CHARACTERISATION FORM
File Reference: John Lynsky, Acres, Knockatallon, Co Monaghan.
Prefix: Mr jj First Name: '400 Ft Surname: Lynsky
Address: Site Location and Townland:
Acres, Knockatallon, Co Monaghan. Acres, Knockatallon, Co Monaghan.
Number of Bedrooms: 4 0 Maximum Number of Residents: 16
Comments on population equivalent
There are 4 double bedrooms which will equate to six adults.
Proposed Water Supply:
Mains 17 Private Well/Borehole ❑ I Group Well/Borehole
Soil Type, (Specify Type):
Subsoil, (Specify Type):
Cut. Soil basin Peat. Blanket peat.
Cut over raised peat.
Bedrock Type: DSL
Aquifer Category: Regionally Important I Locally Important LI 0 Poor El
Vulnerability: Extreme j High ❑ Moderate Eli Low
Groundwater Body: jTydavnet I Status fGood
Name of Public/Group Scheme Water Supply within 1 km: Aughnashalvey GWS
Source Protection Area: ZOC SI SO Groundwater Protection Response: I R1 E
Presence of Significant Sites
(Archaeological, Natural & Historical):
Past experience in the area:
gone
I did test holes for the house next door a number of years ago and recommended a raised
mound percolation 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).
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 on a generally flat plane.
Slope: Steep (>1:5) Shallow (1:5-1:20) Relatively Flat (<1:20)
Slope Comment About 1:25. Quite flat.
Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres)
Houses:
Dwelling houses along West and East boundary of the site,
Existing Land Use:
Not currently being used.
Vegetation Indicators:
Grass and some rushes.
Groundwater Flow Direction: Expected North-East
Ground Condition:
Firm during a spell of wet weather.
Site Boundaries:
Mature hedges, recently planted hedges and fencing.
3.1 Visual Assessment (contd.)
Roads:
Local road along the South-West boundary of the site.
Outcrops (Bedrock And/Or Subsoil):
None
Surface Water Ponding:
None
Lakes:
Kilmore lake 1.2km South-west.
Beaches/Shellfish Areas:
None
Wetlands:
None
Karst Features:
None
Watercourses/Streams:"
Stream 200m South.
*Note and record water level
3.1 Visual Assessment (contd.)
Drainage Ditches:*
None within 50m
Springs:*
None within 100m
Wells:'
\lone 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 firm condition underfoot with the assessment being carried out during mild weather. This site report is for site
improvement in the form of a 15m x 15m raised mound that has been constructed at the site.
'Note and record water level
3.3(b) Surface Percolation Test for Soil
Step 1: Test Hole Preparation
Percolation Test Hole 1 2 3
i II II 1
Depth from ground surface
to top of hole (mm)
Depth from ground surface I 38011 370 380
to base of hole (mm)
Depth of hole (mm) 380 370 380
Dimensions of hole II II
[length x breadth (mm)] 290 x 29011 280 x 280 270 x 290
Step 2: Pre -Soaking Test Holes
Pre-soak start Date
Time
2nd pre-soak Date
start Time
24 -Apr -2026
11:00
25 -Apr -2026
13:00
24 -Apr -2026 I
11:00
25 -Apr -2026
13:00
Each hole should be pre-soaked twice before the test is carried out.
Step 3: Measuring TWO
1
2
3
Percolation Test Hole No.
I
II
II
I
26 -Apr -261
26 -Apr -26
26 -Apr -2026
Date of test11
10:30
10:30
10:30
Time filled to 400 mm
11:20 II
11:3011
11:10
Time water level at 300 mm
50.00 �—
60.0011
40.001
Time to drop 100 mm
50.00
Average TWO
24 -Apr -2026
11:00
25 -Apr -2026
13:00
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 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
11:201112:251165.00111:301112:301160.00
11:10 12:0011 50.00
2
12:251[14:1511 110.00112:30
14:0I 90.00
12:00 13:1011 70.001
3
I 14:15 16:3511 140.00114:00
16:2511 145.00
13:10 15:2011130.00
Average AT
98.33
83.33
105.00
Value
Average AT/4 =
[Hole No.1] 26.251(T1)
Average AT/4 =
[Hole No.2] 24.581(T2)
Average AT/4 =
[Hole No.3] I 20.831(T3'
Result of Test: Surface Percolation Value = 23.891 (min/25 mm)
Comments:
•he imported soil on this raised mound is of good quality and may be used to fo polish treated effluent from an advanced treatment system.
Step 5: Modified Method (where T100 > 210 minutes)
Percolation
Test Hole No.
Percolation
Test Hole No. 2
Fall of water
Time
Start
Finish
Time
Kr s
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
T.
/K,,
300 -250
8.1
=�
0.00
l
300- 250
I 8.1 �� 0.00
00
250 - 200
9.7
�0
0.0011
250 - 200
9.7 Du
0.00
�=
200 - 150
11.9
=�
0.0011
200 - 150
11.9
�0
0.0011=
150 - 100
14.1
00 0.0011
150 - 100
14.1
0�
0.0011_
Average
T- Value T- Value Hole 1 = (T1) I 0.00
Average
T- Value T- Value Hole 2 = (f2) 0.00
Percolation
Test Hole No. 3
Result of Test: Surface Percolation Value =
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) / Tr = 4.45
/K,
300 - 250 I 8.1 0.00 i I I
250 - 200 I 0.00 [ �
200 - 150 �� 11.9 0.00
150-100 I 14.1 =0 0.00 T _____
Average I 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: 1:25
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: 23.89 Sub -surface:
Not Suitable for Development II
Identify all suitable options
1. 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 / fEll
Yes
treatment area (Section 10.2)
Suitable for Development
Discharge Route'
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 the constructed raised mound soil polishing filter at the site shall be used to polish final
effluent from an advanced treatment system. The raised mound measures 15m x 15m. 1 m of the original soil was removed
from the ground beneath the raised mound which gives a total dept of the mound of 1.8m I recommend 60m of percolation
trench in the soil polishing filter consisting of 5 lengths of trench each measuring 12m. 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. A surface water
drain measuring 1 m deep shall be employed (min 2m away) all around 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.
SYSTEM TYPE: Septic Tank Systems (Chapter 7)
}
Tank Capacity (m') Percolation Area
Mounded Percolation Area
No. of Trenches
No. of Trenches 5.00
Length of Trenches (m)
Length of Trenches (in) 12.00
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
BAF TREATMENT SYSTEM
Soil
Capacity PE 6
Constructed Wetland
Sizing of Primary Compartment
Other
2.901m
Polishing Filter*: (Section 10.1)
Surface Area (m2)" 30.00
Option 3 - Gravity Discharge 60.00
Trench length (m)
Option 1 - Direct Discharge
Surface area (m2) Q
Option 4 - Low Pressure
Pipe Distribution
Option 2 Pumped Discharge
Trench length (m)
Surface area (m2)
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)
I 30.001 Surface area (m2) 30.00
Surface Water " Discharge Rate (m3/hr)
10.04
* Hydraulic loading rate is determined by the percolation vale 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: jBiolabs
Prefix: Mr 0 First Name: Michael J Surname: IHolohan
Address:
ITERERA, SCOTSTOWN, CO. MONAGHAN
Qualifications/Experience: GSI / EPA CERTIFIED
Date of Report: 26 -Apr -2026
Phone: L E-mail
Indemnity Insurance Number: AP10002262
UP1L11a
NOTE: To secure your work prior to forwarding to third parties please select Print, select Printer
"print to PDF" and name and save document.
xr •r;
1 JI
�i Y :-Iii !
TAN
FLY , •",�y$.R-;R-3. 4:, 'd a ,+ xdl, :y�`f�F'•y • i µ-�'�� v ``� "1
p.' a;;i•F`4 �'° 3 . .. .' �+ �� P"["
t + 1
� . n FY - . • ,(",:.. •
ms=♦4% � f'y �� ,
-'. ?►. •-
• R-
4 -t _ -_ • r gee 9,�. ,� h '',�'�- - T,, .,L
VIEWS OF COMPLETED RAISED MOUND SOIL POLISHING FILTER
,r �a
' r . �'� ^F `
Vi; ' ♦ � .ti{� a. tM1 �
l
( �ryn� t
VIEWS OF COMPLETED RAISED MOUND SOIL POLISHING FILTER
P1
5,-. S •- ..,5 S
7 Ti
P2
P TEST HOLES