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HomeMy WebLinkAbout269 - Site Assessment ReportULF ©©\U FOR MARTINA GRAY , DERRYDORRAGHY, TYDAVNET, CO MONAGHAN. MON. CO. CO. PLANNING SECTION 03 MAR 2026 APPENDIX A: SITE CHARACTERISATION FORM File Reference: Martina Gray, Derrydorraghy, Tydavnet Prefix: Ms First Name: IMa1na I Surname: Gray Address: Site Location and Townland: Number of Bedrooms: 4 Maximum Number of Residents: V� Comments on population equivalent There are 4 double bedrooms which will equate to six adults. Proposed Water Supply: Mains 7 Private Well/Borehole Soil Type, (Specify Type): Subsoil, (Specify Type): Poorly drained mineral soil. Gleys. AminPD Sandstone and Shale till. TLCSsS Group Well/Borehole Bedrock Type: DSL Aquifer Category: Regionally Important I Locally Important LI Poor Vulnerability: Extreme j High Moderate Low Groundwater Body: Tydavnet I Status Good Name of Public/Group Scheme Water Supply within 1 km: Tydavnet GWS Source Protection Area: ZOC Li SI Li SO ❑ Groundwater Protection Response: R1 Presence of Significant Sites (Archaeological, Natural & Historical): Past experience in the area: Comments: None I recommended a raised mound in a site nearby a few years ago. (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: Quite flat near base of North -Westerly facing hill. Slope: Steep (>1:5) fj Shallow (1:5-1:20) f0 Relatively Flat (<1:20) fj Slope Comment ABOUT 1: 14 Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres) Houses: Dwelling house 20m South. Dwelling house 85m North and 128m South-West. Poultry unit 240m North-East Existing Land Use: Wasteground Vegetation Indicators: Grass. Groundwater Flow Direction: Expected North-East Ground Condition: Firm during a spell of unsettled wet cold weather. Site Boundaries: Mature hedges all around. 3.1 Visual Assessment (contd.) Roads: Local road along Eastern boundary hedge. Outcrops (Bedrock And/Or Subsoil): None Surface Water Ponding: None Lakes: Mullaghinaghigo lake 349m East South -East. Shee lake 550m North-West Beaches/Shellfish Areas: None Wetlands: None Karst Features: None Watercourses/Streams:* Derrydorraghy river 243m East. *Note and record water level 3.1 Visual Assessment (contd.) Drainage Ditches:* Shallow ditch along Eastern boundary near full of water 0.2m deep Springs:" None 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 very wet unsettled weather. NOTE: Planning was previously passed on this site and the foundation and concrete base was laid down about 16 years ago. '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) (if present): 1.8 Depth of water ingress: I 0.31 Rock type (if present): INane � Date and time of excavation: 17 -Dec -2025 09:301 Date and time of examination: 19 -Dec -2025 10:00 Depth of Surface and Subsurface Percolation Tests 0.1m I 0.2m I 0.3m 1I 0.4m IS I 0.5m 0.6m F 0.7 m 0.8m SS 0.9m I 1.Om [ 1.1 m 1.2m I 1.3 m 1.4 m 1.5 m 1.6m 1.7m I 1.8m 1.9m C_ 2.0 m 2.1 m C 2.2 m 2.3m I 2.4 m 2.5 m ( 2.6 m 2.7 m I 2.8m I 2.9 m 3.0 m 3.1 m I 3.2 m C 3.3m I 3.4m I 3.5m r Soil/Subsoil Texture & Classification** SILT / CLAY TOP SOIL SILT / CLAY subsoil Some mottling at 0.8m SILT / CLAY subsoil ----------------- ----------------- Water table at 1.86m Base of trial hole 2.1 m Plasticity and Soil Density/ dilatancy*** Structure Compactness 3 threads —60mm ribbons — dilatant 4 threads - 90mm ribbons - dilatant 2 threads - 40mm ribbons - dilatant Likely Subsurface Percolation Value: L Likely Surface Percolation Value: I40 CRUMB UNCOMPACT BLOCKY UNCOMPACT GRANULAR UNCOMPACT Colour**** Preferential flowpaths BROWN GRASS ROOTS NONE CREAM 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. 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 sub -soil that was cream in colour and blocky in nature with mottling visible around 0.8m. Below that was subsoil that was granular in nature and uncompact. The water table was at 1.6m. 3.3(a) Subsurface Percolation Test for Subsoil Step 1: Test Hole Preparation Percolation Test Hole 2 3 r Depth from ground surface 400 400 400 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 I II Ii 280 x 300 290 x 290 290 x 310 [length x breadth (mm)]ii Step 2: Pre -Soaking Test Holes Pre-soak start Date 17 -Dec -2025 17 -Dec -2025 I 17 -Dec -2025 Time 12:00 12:00 12:oo 2nd pre-soak Date 18 -Dec -20251 18 -Dec -2025 18 -Dec -2025 start Time 14:00 14:00 14:00 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 19-12-2025 F 19-12-2025 19-12-2025 Time filled to 400 mm 10:00 10:00 10:00 Time water level at 300 mm I 11:10 11:2011 11:30 Time (min.) to drop 100 mm (T,00) I 70.00 1 80.001190.00 Average T1oo 80.001 If T1oo > 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 (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 I 11:10 12:3011 80.00 11:20 12:5011 90.00 11:30 13:1011 100.00 12:30 14:5011 140.00 12:50 15:30 160.00 13:10 15:4011 150.00 3 14:50 18:2011 210.00 15:30 18:4011 190.00 15:40 19:1011 210.001 Average At 153.33 143.33 146.67 Value Average At/4 = [Hole No.1] I 35.831(t1) Average At/4 = [Hole No.2] 1 36.671(t2) Average At/4 = [Hole No.3] I 38.331(t3) Result of Test: Subsurface Percolation Value = 36.941 (min/25 mm) Comments: 'he T test was a pass but with some mottling visible below 0.8m I will be recommending a raised mound soil polishing filter. Step 5: Modified Method (where T100> 210 minutes) Percolation Test Hole No. Percolation Test Hole No. 2 Fall of water in hole (mm) Time Factor = T, Start Time hh:mm Finish Time hh:mm Time of fall (rains) =T K,s = T, / T T - Value = 4.45 /K, Fall of water in hole (mm) Time Factor = T, Start Time hh:mm Finish Time hh:mm Time of fall (mins) =T, K, = T, / T T — Value = 4.45 /K,s 300 -250 8.1 = 0.00 =0 300- 250 8.1 0.00 �� 250 - 200 9.7 0� 0.00 0.00 H0 250 - 200 9.7 � 0.00 0� 0.00 �� 200 - 150 11.9 QD 200 - 150 11.9 150 - 100 14.1 _� 0.00 j]1_1 150- 100 14.1 0.0011 _____ Average T- Value T- Value Hole 1 = (T1) 0.00 Average T- Value T- Value Hole 2 = (T2) 0.00 Result of Test: Subsurface Percolation Value = Percolation 0.00 (min/25 mm) Test Hole No. 3 Fall of water Time Start Finish Time K. T — in hole (mm) Factor Time Tim§e of fall =T, Value =T, hh:mm hh:mm (mins) /T =4.45 =T /K„ 300 - 250 8.1 = 0.00 �� 250 - 200 9.7 =� 0.0011� 200 - 150 11.9 =� 0.0011� 150- 100 14.1 =� 0.0011� Average I T- Value T- Value Hole 3 = (T2) 0.00 Comments: 3.3(b) Surface Percolation Test for Soil Step 1: Test Hole Preparation Percolation Test Hole 1 2 3 I II II Depth from ground surface to top of hole (mm) Depth from ground surface I 400II 400j 400 to base of hole (mm) Depth of hole (mm) 400 400 400 Dimensions of hole [length x breadth (mm)] 300 x 310 300 x 300 300 x 300 Step 2: Pre -Soaking Test Holes Pre-soak start Date 17 -Dec -2025 j 17 -Dec -2025 17 -Dec -2025 Time I 12:05 I 12:05 I 12:05 2nd pre-soak Date 18 -Dec -2025 18 -Dec -2025 18 -Dec -2025 start Time 14:05 I 14:05 14:05 Each hole should be pre-soaked twice before the test is carried out. Step 3: Measuring TWO 1 2 3 Percolation Test Hole No. 1 1 19 -Dec -25 19 -Dec -25 19 -Dec -2025 Date of test Time filled to 400 mm 10:05 ir 10:05 10:05 10:50 10:55 10:50 Time water level at 300 mm f — 45.00 50.00 45.00 Time to drop 100 mm (T,00 Average T 1 46.67 g TWO 1 If T1> 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 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 rnm) mm) (at 300 (at 200 mm) mm) (at 300 (at 200 mm) mm) 10:50 11:5511 65.00 10:551112:1011 75.00 10:50 11:501160.00 2 r 11:55 13:3011 95.00 12:101113:5011 100.00 11:50 13:1011 80.001 3 I 13:301116:2011 170.00113:50 16:4511 175.00 13:10 16:0011170.00 Average AT 103.33 110.00 116.67 Value Average AT/4 = [Hole No.1] I 27.501(T1) Average AT/4 =___________ [Hole No.2] I 29.171(12) Average AT/4 = [Hole No.3] I 25.831(13' Result of Test: Surface Percolation Value = l 27.50 (min/25 mm) Comments: fhe topsoil at this site is of good quality and may be used to form a raised mound soil percolation area to polish treated effluent from an advanced treatment system. Good topsoil is already piled up at the site. 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 (mins) / T = 4.45 = T, hh:mrn hh:mm (mins) IT = 4.45 =T /K,, 300 - 250 I 8.1 II II II 0.00 lII 300 - 250 I 8.1 0.00 =0 250 - 200 1 II II 0.00 =I 250 - 200 I 0.00 F- 200 - 150 11.9 IL It I 0.00 1III 200- 150 I 11.9 00 0.00 ______ 150 - 100 14.1 I If 0.00 f= 150 -100 14.1 =0 0.00 == Average I T- Value T- Value Hole 1 = (T1) I 0.00 Percolation Test Hole No. 3 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 / Kra 300 - 250 I 8.1 0.00 �I 250 - 200 I 0.00 200- 150 I 11.9 == 0.00 150- 100 14.1 �� 0.00 �= Average I T- Value T- Value Hole 3 = (T2) I 0.00 Average I T- Value T- Value Hole 2 = (T2 ) I 0.00 Result of Test: Surface Percolation Value = 0.00 (min/25 mm) Comments: 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_14 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) .990 Percolation test result: Surface: 27.50 Sub -surface: 36.94 Not Suitable for Development II Suitable for Development 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) Tertiary Treatment System and Infiltration / Yes treatment area (Section 10.2) Discharge Route' Groundwater Propose to install: Secondary Treatment System and soil polishing filter n� and discharge to: Ground Water Q 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 shall be made up of the insitu topsoil and is required as there was some evidence of mottling below 0.8m. 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 15m 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. The open ditch along the Eastern boundary hedge next the road shall be piped and stoned. 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 ui 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) 0 Percolation Area Mounded Percolation Area No. of Trenches li No. of Trenches F 6.00 Length of Trenches (m) 1 Length of Trenches (m) 1 10.00 Invert Level (m) j 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 1 I 1 I I IBAF TREATMENT SYSTEM Soil Capacity PE j6 Constructed Wetland Sizing of Primary Compartment Other 2.90!m3 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) Option 4 - Low Pressure Pipe Distribution 0 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 30.00 Surface area (m2) J 30.00 Surface Water ** Discharge Rate (m3/hr) I oi] * Hydraulic loading vale 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 pending. 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: [Biolabs Prefix: Mr Q First Name: IMichael J Surname: IHolohan Address: ITERERA, SCOTSTOWN, CO. MONAGHAN Qualifications/Experience: IGSI / EPA CERTIFIED Date of Report: 19 -Dec -2025 Phone: 0868169162 E-mail biolabsirl@outlook.com Indemnity Insurance Number: F AP100022621 Signature: _ !C2 O WELLS AND BOREHOLES ADJACENT TO THE SITE U Public Supply Source Protection Areas SI-Inner Protection Area SO -Outer Protection Area SOURCE PROTECTION DATA (N/A) RIVERS AND LAKES AQUIFER CATEGORY LI SiTE VULNERABILITY LOW .Sri BEDROCK DSL .;'cT •• ,rr1 • . t ,•.. •tit. • •Ir , • • .� , ''( .I ` .. tlt. -t• •.•. ..�, 1 � . _ Wit_ - r ,' •`.: tI:-. : ' `Y . '• ' •< • `"'ter.-,... ! ,•' j l` - / ••, • •• I •. '\/ / •• . .• - '' f• �r 1 M•,+ . • 1 k � ,�. V• * try + Z.�v1t/ • �'� �• ► { ,• ! — — ,•'...•• ,p . , , •Ic_ - ••. ••_l_ - •i '-.., Il�cdi 1 't - • - :/1 - •• 2-- - • • ••. _ 1 ` '• • JAM'`. ? 1• 1 �•. 1p1ps I rJ t.• 1 WAlL E mac. 4 AERIAL VIEW OF PERCOLATION SITE TN N OUSE MJ4'TtP E SKETCH OF PERCOLATION AREA INCLUDING SITE SURROUNDS �,,rt�--�•.a �.R hC' �� .,+--'� 'vim✓ ,�3 h �°'�'T' 9� .4 �ur- �y„-! '� • r1 +.. sj`. v�t : : � r '' ` c'x�,� ^•S5 �'�' :.-�r� - � "'gs's� : - Ys r' .� lam. -..'uw - +' n •-`1a ,�T"✓Sky � .-fix s- 7fi' .�l�l 'wt�,, ' r ✓ wk' -:' �' � ;m t ` c p1t{ Cf-' 1"'�' �'= 3 .?g �J.��`c�. - - ..:,-�,� om:,• +. _ ,,• rl�� _. : ��./ 1 •Rv �._ Y�j �t.ii �* y 2:. p. •9v�, f • 171 /` t s E "1wi may' . J � ,/ J . f �{� , y._ � is •'! f n� p .r � r A¼� I 1 7, OPEN DITCH ALONG SITE BOUNDARY HEDGE EXISTING CONCRETE FOUNDATION BASE OF HOUSE I 4I+ +f Y£ c , 3 L 4' r w✓ r j [yC�R�t'`'t �` :1 ':;°•:-' 4 TRIAL HOLE TWO DAYS AFTER EXCAVATION I !1 t 1 i , �, f..gl��i �t� s'�IT f. ` 'j ..•�1N 1 , lj�v.�•i �i� t�. k ' F A,�t� t ✓ ) *. p�,� ;OFrna, ;/v _ .../� Ti T2 T �^ ; 47;,w ► - ;. n .,1 ' Vic' �. _; - T TEST HOLES P3 P TEST T O LES OUTLINE SPECIFICATIONS FOR MOUNDED SOIL POLISHING FILTER 1. Treated effluent from the mechanical aeration sump unit shall be pumped intermittently 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 15m and may be landscaped into the contours of the site. 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 im deep shall be employed all around the raised mound 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. 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 ble 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 GEOTEXTILE LAYER TOPSOIL 100MM 150MM WASHED STONE ABOVE PIPE O 100MM PIPE 250MM WASHED STONE BELOW PIPE SUITABLE SUBSOIL MINIMUM 0.9M Water tablel.6m EACH TRENCH 500MM WIDE 0.6M INVERT OF TRENCH MOUNDED TOPSOIL 1.0M GROUND LEVEL SECTION THROUGH MOUNDED SUBSOIL PERCOLATION SYSTEM