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HomeMy WebLinkAbout2677 - Site Assessment ReportU1 © /11 ©1 FOR PAUL McMAHON, TULLYSHELFERTY, DUNRAYMOND, CO. MONAGHAN. PLANNNG CTON 19 AUG 2026 .i FF �� 11 APPENDIX A: SITE CHARACTERISATION FORM File Reference: Paul McMahon Prefix: Mr First Name: Paul I Surname: IMcMahon Address: Site Location and Townland: [u)lYsholfertDunraYmond._Co Monaghan Number of Bedrooms: 31 Maximum Number of Residents: A Comments on population equivalent There are 3 double bedrooms which will equate to five adults. Proposed Water Supply: Mains ® Private Well/Borehole Soil Type, (Specify Type): Subsoil, (Specify Type): Surface and ground water gleys. AminPD Sandstone and shale till. TLPSsS Group Well/Borehole Bedrock Type: OM Aquifer Category: Regionally Important I Locally Important Poor PI Vulnerability: Extreme ❑ High Moderate [✓ Low Groundwater Body: Cavan Status Good Name of Public/Group Scheme Water Supply within 1 krn: Istranooden GWS Source Protection Area: ZOC SI SO Groundwater Protection Response: R1 Presence of Significant Sites (Archaeological, Natural & Historical): Past experience in the area: Commen₹s: None None (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 is for a proposed log 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: Slightly elevated on gentle North -Westerly facing slope. Slope: Steep (>1:5) LII Shallow (1:5-1:20) ✓� Relatively Flat (<1:20) Slope Comment ABOUT 1: 17 Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres) Houses: Dwelling house 139m North, 152m South South-West and 187m West North-West. Existing Land Use: kgricultural grassland. Vegetation Indicators: crass. Groundwater Flow Direction: Expected North-West Ground Condition: Firm during a spell of warm weather. Site Boundaries: Mature hedges all around. 3.1 Visual Assessment (contd.) Roads: Local road along North-West boundary hedge. Outcrops (Bedrock And/Or Subsoil): None Surface Water Ponding: None Lakes: Un-named lake 1.45km West. Beaches/Shellfish Areas: None Wetlands: None Karst Features: None Watercourses/Streams:* Tulaigh-na-Siolfartai river 95m North-East. *Note and record water level 3.1 Visual Assessment (contd.) Drainage Ditches:* Open dry ditch 30m North-West 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 warm dry 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) (if present): 2.1 Depth of water ingress: 0.01 Rock type (if present): None Date and time of excavation: j 22 -Jul 2026 I 17:001 Date and time of examination: I 24 -Jul -2026 I 09:00 Depth of Surface and Subsurface Soil/Subsoil Percolation Texture & Plasticity and Soil Density/ Colour**** Preferential Tests Classification** dilatancy*** Structure Compactness flowpaths 0.1m II 0.2 m 1_ 0.3m1 0.4 m 0 0.5m I 0.6m I 0.7 m I1 0.8m Iss 0.9m1 1.Oml lI 1.1m lI 1.2m I 1.3m I I 1.4 m II 1.5m 0 1.6m 1.7m II 1.8m II 1.9m II 2.Om II 2.1m II 2.2 m I 2.3m I 2.4 m lI 2.5 m l_____ 2.6 m II 2.7 m I 2.8m l� 2.9m II 3.0m II 3.1m 0 3.2m 0 3.3m I 3.4m 3.5m II SILT / CLAY TOP SOIL CLAY subsoil Base of trial hole 2.1 M 3 threads —70mm ribbons — dilatant 6 threads - 130mm ribbons - not dilatant Likely Subsurface Percolation Value: I 45 Likely Surface Percolation Value: 35 CRUMB MASSIVE UNCOMPACT UNCOMPACT BROWN PALE BROWN / ORANGE 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. GRASS ROOTS NONE 3.2 Trial Hole (contd.) Evaluation: The trial hole was 2.1 m deep with two distinct layers. Top -soil that was crumb in nature and below that sub -soil that was pale brown and orange in colour and massive in nature below 0.7m with a high percentage of clay. There was no water table after 48 hours. 3.3(a) Subsurface Percolation Test for Subsoil Step 1: Test Hole Preparation Percolation Test Hole 1 2 3 Depth from ground surface 1 40011 40011 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 ft 400 Dimensions of hole 300 x 300 310 x 280 290 x 290 [length x breadth (mm)] Step 2: Pre -Soaking Test Holes Pre-soak start Date 22 -Jul -2026 22 -Jul -2026 22 -Jul -2026 Time 20:001 I 20:00 20:00 2nd pre-soak Date 23 -Jul -20261 I 23 -Jul -2026 23 -Jul -2026 start Time 11:30 11:30 11:30 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 24-07-2026 �— 24-07-2026 24-07-2026 Time filled to 400 mm 09:00 09:00 09:00 Time water level at 300 mm 10:1011_10:2011_10:101 Time (min.) to drop 100 mm (" 100) 70.00 _ 60.00 70 0:0 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; 73.33 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 10:10 11:40 90.00 10:20 12:0011 100.00 10:10 11:5011 100.00 2 11:40 13:5011 130.00 12:00 14:3011 150.001 11:50 14:1011 140.00 3 13:50 17:1011 200.00 14:30 17:4011 190.00 14:10 17:2j 195.00 Average At 140.00 146.67 145.00 Value Average At/4 = [Hole No.1] I 35.00 (tt) Average At/4 = [Hole No.2] 36.671(t2) Average At/4 = [Hole No.3] I 36.251(t3) Result of Test: Subsurface Percolation Value = 35.97 (min/25 mm) Comments: 'he T test was a pass but with a high percentage of clay below 0.7m I will be recommending a raised mound soil polishing filter. Step 5: Modified Method (where T100 > 210 minutes) Percolation Test Hole No. 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, 300 - 250 I 8.1 0.0011 250- 200 9.7 �0 0.0011 _____ 200- 150 � 11.9 0 0.00 � 150-100 14.1 �� 0.00 Average T- Value T- Value Hole 1 = (T1) 1 0.00 Percolation Test Hole No. 3 Fall of water Time Start Finish Time K„ T— in hole (mm) Factor Time Tim§e of fall = T, Value =T1 hh:mm hh:mm (mins) /T =4.45 =T /Kf. 300 - 250 I 8.1 0.00 0 250 - 200 I9.7 =0 0.00 _____ 200 - 150 11.9 � 0.00 � � 150- 100 14.1 0.00 � Average I T- Value T- Value Hole 3 = (T2) 0.00 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 (miss) =T K,, = T, / T T — Value = 4.45 /K1s 300 - 250 8.1 �0 0.00 == 250-200 9.7 0� 0.00 == 200-150 11.9 00 0.00 150-100 14.1 �� 0.00 �� Average T- Value T- Value Hole 2 = (T2) I 0.00 Result of Test: Subsurface Percolation Value = 0.00 (min/25 mm) Comments: 3.3(b) Surface Percolation Test for Soil Step 1: Test Hole Preparation Percolation Test Hole 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 2 3 II 1 400 400 400 400 400 400 320 x 340 340 x 270 350 x 270 Pre-soak start Date I 22 -Jul -2026 22 -Jul -2026 j 22 -Jul -2026 Time I 20:05 I 20:05 20:05 2nd pre-soak Date 23 -Jul -2026 23 -Jul -2026 23 -Jul -2026 start Time 11:35 11:35 11:35 Each hole should be pre-soaked twice before the test is carried out. Step 3: Measuring T100 1 2 3 Percolation Test Hole No. I II II I 24 -Jul -26 24 -Jul -26 24 -Jul -2026 Date of test 09:05 09:05 09:05 11Time filled to 400 mm 10:05 10:25 10:05 Time water level at 300 mm 60.00 60.00 II 60.00 Time to drop 100 mm (T,00) 66.67 Average T100 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 mm) mm) (at 300 (at 200 mm) mm) (at 300 (at 200 mm) mm) 1 10:05 11:2511 80.00 10:251112jfl 115.00 10:0511 11:15 70.00 2 I 11:25 13:1011 105.00112:20 14:2011 120.00 11:15 12:4011 85.00 3 Average AT 13:10 15:40 150.00 14:20 16:5511 155.00 12:40 15:oofl 140.00 98.33 111.67 130.00 Value Average AT/4 = [Hole No.1] I 27.921(T1) Average AT/4 = [Hole No.2] I 32.501(12) Average AT/4 = [Hole No.3] I 24.58 (T3' Result of Test: Surface Percolation Value = 28.33 (min/25 mm) Comments: the 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. Step 5: Modified Method (where T100> 210 minutes) Percolation Test Hole No. 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) / Tm = 4.45 =T /K 300 - 250 I 8.1 0.00 l I 250 - 200 9.7 0.00 �� 200- 150 � 11.9 00 0.00 ______ 150-100 � 14.1 � 0.00 � Average I T- Value T- Value Hole 1 = (Ti) 0.00 Percolation Test Hole No. 3 Fall of water Time Start Finish Time K,s T - in hole (mm) Factor Time Time of fall = T, Value = T, hh:mm hh:mm (mins) / Tm =4.45 =T/K, 300 -250 I8.1 0.00 l I 250 - 200 9.7 0.00 II 200-150 11.9 0.0011 I 150-100 14.1 0.00I _____I Average I T- Value T- Value Hole 3 = (12) 0.00 Percolation Test Hole No. 2 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 =T 300 - 250 I 8.1 0 0.00 00 250 - 200 9.7 �0 0.00 �� 200-150 11.9 �0 0.0011= 150-100 14.1 0= 0.00 �� Average I T- Value T- Value Hole 2 = (T2) 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: 1:17 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: 28.33 Not Suitable for Development I Identify all suitable options Septic tank system (septic tank and percolation area) (Chapter 7) Secondary Treatment System (Chapters 8 and 9) and soil polishing filter (Section 10.1) No Yes 3. Tertiary Treatment System and Infiltration / treatment area (Section 10.2) Yes Sub -surface: 35.97 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 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 a high percentage of clay in the subsoil below 0.7m. I recommend 50m of percolation trench in the soil polishing filter consisting of 5 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 five 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 final 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) LII I Length of Trenches (m) 10.00 Invert Level (m) II 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 I I Capacity PE 5 Constructed Wetland Sizing of Primary Compartment Other I 2.751 m3 Polishing Filter*: (Section 10.1) Surface Area (m2)* 25.00 Option 3 - Gravity Discharge 50.00 Trench length (m) Option 1 - Direct Discharge Surface area (m2) II Option 4 - Low Pressure Pipe Distribution Option 2 - Pumped Discharge Trench length (m) Surface area (m2) 0 Option 5 - Drip Dispersal I 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) I 25.00 Surface Water ** ❑ Discharge Rate (m3/hr) I 0.031 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 to so as to ensure that the system continues to function properly. Company: Biolabs Prefix: Mr a First Name: Michael Surname: Holohan Address: Iterera, Scotstown, Co Monaghan. Qualifications/Experience: GSI / EPA Certified. I Date of Report: 25 -Jul -2026 Phone: 0868169162 E-mail biolabsirl@outlook.com Indemnity Insurance Number: RPI-IE000946-00 Signature: f WELLS AND BOREHOLES ADJACENT TO THE SITE SOURCE PROTECTION DATA (N/A) RIVERS AND LAKES AQUIFER CATEGORY PI VULNERABILITY MODERATE BEDROCK OM -f 1 f Ii ' fr&fjitMn ";i II Mt Lc#T, w• 1 z I T�. 1-1 •I / . •1• / \ 11I. / -- '-\ c* -- - - - • ..* t' - -. - ''1 It rti. \ _ • f 1r •f!Witt ,r \ t,, ff t ..,_ Ir N Urbalkirk K 8 II Usmacl , Druma&gani i Lmw%7 i !i: 10 G 1X11 s _._. • 170 rIi t • 177 JI I B! / Tullys elferty •_ , �� ► cS 172 ` 3 ITS 45 . • 167 ,, 174 Tetoppa V1 Tor' isdo y '� • '144 ' ```--�---- 154 Garran roe is 11 • isdrurn ' a liar 'N .... .... C o r n as o . . f AERIAL VIEW OF PERCOLATION SITE t-lo�SL' tocl+L R oA40 T lN Tki A L !-JoL( P3 6*0WNA WAIrck V-Cv d &6-ulA1 G- NvuSk SKETCH OF PERCOLA /' ri fr1i�rUIZE 14 Fu G -es '' QG ;1 j7 J / 1;' INCLUDING SITE SURROUNDS F •.k��fKiill��b� � C, `. .,. ''� �s %tom { •. _ �M_�la�d w'. �y VIEWS OF PERCOLATION SITE VIEWS OF PERCOLATION SITE TRIAL HOLE ON DAY OF EXCAVATION !�'>f"2fy��1YTJT" j'1�.•. A`���y �It� J 7 R'It S � t T d-i r 9711 r. - p iY f • „y v I :1{M(/� 4i' l •Mlw • ttij �: •, q �•tl YA •,, l�y4: TRIAL HOLE TWO DAYS AFTER EXCAVATION •* 7 •r _ if -t44 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 5 percolation trenches. The raised mound shall be 1m in height throughout its area and consist of the topsoil from the site. The mound shall measure 13m x 13m 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 5 percolation trenched shall be 10m. Total length 50m. 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 from 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 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 GEOTEXTILE LAYER TOPSOIL 100MM 150MM WASHED STONE ABOVE PIPE O 100MM PIPE 250MM WASHED CONE BELOW PIPE SUITABLE SUBSOIL MINIMUM 0.9M CLAY EACH TRENCH 500MM WIDE 0.6M INVERT OF TRENCH MOUNDED TOPSOIL 1.0M GROUND LEVEL SECTION THROUGH MOUNDED SUBSOIL PERCOLATION SYSTEM