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HomeMy WebLinkAbout2679 - Site Assessment ReportUUI ©UffU© FOR CAROLINE McKENNA, DERRYHEE, EMYVALE, CO. MONAGHAN. MON. CO. CO. PLANNING SECTION 21 AUG 2026 PLANNING DEPARTMENY REF NO. 26179 MONAGHAN Co.. COUNCIL APPENDIX A: SITE CHARACTERISATION FORM File Reference: Caroline McKenna Derryhee, Emyvale. Prefix: Ms First Name: Caroline Surname: McKenna Address: Site Location and Townland: Derryhee, Emyvale, Co Monaghan Derryhee, Emyvale, Co Monaghan Number of Bedrooms: 4 Maximum Number of Residents: 6 Comments on population equivalent There are 4 double bedrooms which will equate to six adults. Proposed Water Supply: Mains 17 Private Well/Borehole Soil Type, (Specify Type): Subsoil, (Specify Type): Surface and ground water gleys. AminPD Sandstone till. TDCSs Group Well/Borehole Bedrock Type: DMSSL Aquifer Category: Regionally Important Locally Important Lm Poor Vulnerability: Extreme High Moderate Low ❑✓ Groundwater Body: jAughnacloy Status Good Name of Public/Group Scheme Water Supply within 1 km: Tydavnet GWS Source Protection Area: ZOC SI ❑ SO ❑ Groundwater Protection Response: R1 Presence of Significant Sites (Archaeological, Natural & Historical): Past experience in the area: None A site close by had good percolating soil. 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. r- 3.1 Visual Assessment Landscape Position: Elevated Easterly facing hill. The hill is much steeper above the proposed percolation area. Slope: Steep (>1:5) Shallow (1:5-1:20) ✓� Relatively Flat (<1:20) ❑ Slope Comment 1 ABOUT 115 L___________________ Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres) Houses: Home dwelling house and farm buildings 116m North. Brother's dwelling house 86m West. Existing Land Use: Good agricultural grassland. 3etation Indicators: Grass. Groundwater Flow Direction: Expected North-East. Ground Condition: Firm during a spell of warm weather with occasional showers. Site Boundaries: Mature hedges all around. 3.1 Visual Assessment (contd.) Roads: Local road 328m South and farm lane 61 m West. Outcrops (Bedrock And/Or Subsoil): None Surface Water Ponding: None Lakes Tully lough 1.16km East North-East. Beaches/Shellfish Areas: None Wetlands: None Karst Features: None Watercourses/Streams:' Tonynumery river 468m North-West. 'Note and record water level 3.1 Visual Assessment (contd.) Drainage Ditches:* None within 50m 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 weather with occasional showers. *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): 2.2 Depth from ground surface Depth from ground surface to bedrock (m) (if present): to water table (m) (if present): 2.2 Depth of water ingress: 0.0 Rock type (if present): None Date and time of excavation: 03 -Aug -2026 j 12:00 Date and time of examination: 05 -Aug -2026 10:00 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 0 SILT / CLAY 3 threads —50mm CRUMB UNCOMPACT BROWN GRASS ROOTS 0.3 m C___ TOP SOIL ribbons—dilatant 0.4 m IS I 0.5m l� 0.6m 0 0.7 m 0 0.8 m SS 4Threads -90mm BLOCKY 0.9 I m SILT / CLAY subsoil ribbons - dilatant UNCOMPACT PALE NONE 1.0 m II BROWN 1.im 0 1.2 m 1.3m 0 1.4 m 0 1.5m II 1.6 m I 1.7 m 0 SILT/CLAY subsoil 4 threads - 70mm BLOCKY QUITE COMPACT BROWN NONE 1.8 m 0 ribbons-dilatant 1.9m I 2.0m I 2.1 m II 2.2 m 0 2.3 m 0 Base of trial hole 2.2m 2.4 m 2.5m1 2.6 m 2.7m 0 2.8m 0 2.9m 0 3.Om 3.1m 0 3.2m1___ 3.3m 0 3.4m1 3.5 m ( J Likely Subsurface Percolation Value: I 25 Likely Surface Percolation Value: 20 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. 3.2 Trial Hole (contd.) Evaluation: The trial hole was 2.2m deep with three distinct layers. Top -soil that was crumb in nature and below that sub -soil that was pale brown in colour and blocky in nature. Below this was subsoil that was quite compact in nature. The was no water table in the trial hole after two days with the weather being mostly warm and dry. 3.3(a) Subsurface Percolation Test for Subsoil Step 1: Test Hole Preparation Percolation Test Hole 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] 3 400 40011 400 800 800 800 400 400 400 Dimensions of hole br eadth x breadth (mm)] 280 x 280 290 x 290 280 x 300 Step 2: Pre -Soaking Test Holes Pre-soak start Date 03 -Aug -2026 I 03 -Aug -2026 03 -Aug -202 Time 15:00 L__15:001 15:00 2nd pre-soak Date 04 -Aug -2026 04 -Aug -2026 04 -Aug -2026 start Time 1:30 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 05-08-2026 05-08-2026 05-08-2026 Time filled to 400 mm 10:00 10:00 10:00 Time water level at 300 mm 10:50 10:50 11:10 Time (min.) to drop 100 mm (T ) 50.00 50.00 70,00 ,00 Average T100 56.67 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 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 (at 300 (at 200 (at 300 (at 200 mm) mm) mm) mm) mm) mm) 10:50 12:0011 70.001 I 1050 11:5011 60.00 11:10 12:3011 80.00 2 12:00 14:1011 130.00 11:5011 13:5011 120.001 L 12:30 14:5011 140.00 3 14:10 17:2011 190.00 13:50 17:0011 190.00 14:50 18:4011 230.00 Average At 130.00 123.33 150.00 Value Average At/4 = Average At/4 =____________ Average At/4 = [Hole No.1] I 32.501(t1) [Hole No.2] 30.831(t2) [Hole No.3] 37.50 (t.,) Result of Test: Subsurface Percolation Value = 33.61 (min/25 mm) Comments: "he T test was a pass and this is good aerated topsoil and subsoil although the subsoil is quite compact below 1.2m so I shall be ecommending a small raised mound soil polishing filter. Step 5: Modified Method (where TWO > 210 minutes) Percolation Test Hole No. 1 Fall of water Time Start Finish Time K,� I T— in hole (mm) Factor Time Time of fall = T, Value = T, hh:mm hh:mm (mins) IL = 4.45 =T /Ks 300 - 250 8.1 0.00 �� 250 - 200 9.7 _= 0.00 j� 200- 150 11.9 �0 0.0011 150- 100 14.1 � 0.00 �� Average ( 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 Tim§e of fall = T Value = T, hh:mm hh:mm (mins) / T = 4.45 =T /K 300- 250 I 8.1 I I 250 - 200 I9.7 � 0.00 l _____ 200 - 150 11.9 0.00 II 150- 100 14.1 0.00 I ______ Average I T- Value T- Value Hole 3 = (Tz) 0.00 Percolation Test Hole No. 2 Fall of water Time Start Finish Time K1z T — in hole (mm) Factor Time Time of fall = T Value = T, hh:mm hh:mm (mins) / T = 4.45 =T. 300- 250 8.1 I � 0.00 �0 250 -200 9.7 0 0.00 �� 200-150 11.9 0.00 � 150-100 14.1 0� 0.0011_I � Average T- Value T- Value Hole 2 = (T2) 0.00 Result of Test: Subsurface Percolation Value = 0.001 (min/25 mm) Comments: 3.3(b) Surface Percolation Test for Soil Step 1: Test Hole Preparation Percolation Test Hole 1 2 3 i Depth from ground surface to top of hole (mm) Depth from ground surface 400 400M 400 to base of hole (mm) Depth of hole (mm) 400 400 400 Dimensions of hole [length x breadth (mm)] 300 x 300 280 x 290 280 x 280 Step 2: Pre -Soaking Test Holes Pre-soak start Date P 03 -Aug -2026 03 -Aug -2026 03 -Aug -2026 Time I 15:05 15:05 I 15:05 2nd pre-soak Date 04 -Aug -2026 04 -Aug -2026 04 -Aug -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. II II I 05 -Aug -26 05 -Aug -26 05 -Aug -2026 Date of test 10:05 10:05 1 11 10:05 Time filled to 400 mm I 10:50 10:5511 10:50 Time water level at 300 mm 45.00 50.00 45.00 Time to drop 100 mm (T,00) 46.67 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; Step 4: Standard Method (where 1100 ≤ 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 10:50 11:5011 60.00 10:55!!12:0011 65.00 10:50!!11:50!!60.00 2 11:50 13:2011 90.00112:00!!13:3511 95.00 11:50 13:10 80.00 3 13:20 16:0011 160.00 13:35 16:3011 175.00 13:10 15:4011 150.00 Average AT 103.33 111.67 96.67 Value Average AT/4 = Average AT/4 = Average AT/4 = [Hole No.1] 25.831(T1) [Hole No.2] I 27.921(12) [Hole No.3] I 24.17 I(T3' Result of Test: Surface Percolation Value = 25.97 (min/25 mm) Comments: 'he topsoil at this site is of good quality and may be used to construct a small raised mound on the percolation area. Step 5: Modified Method (where T100 > 210 minutes) Percolation ( Percolation Test Hole No. 1 Test Hole No. 2 Fall of water in hole (mm) Time Factor = T, Start Time hh:mm Finish Time hh:mm Time of fall (mins) =T Kr, = 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,, 300 -250 8.1 0.00 �� 300-250 8.1 0.00 00 250 - 200 9.7 0� 0.00 �� 250 - 200 9.7 00 0.00 � 200-150 11.9 =� 0.0011_l� 200-150 11.9 0 0.0011 150- 100 44.1 == 0.0011� 150 - 100 14.1 0 0.0011� Average T- Value T- Value Hole 1 = (Ti) I_o.00_I Average T- Value T- Value Hole 2 = (r2) 0.00 Result of Test: Surface 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 Time of fall = T, Value = T, hh:mm hh:mm (mins) / T = 4.45 300- 250 I 8.1 L]I0.00 L! 250- 200 I9.7 00 0.00 200-150 11.9 =0 0.00 150- 100 14.1 =_____ 0.001! ______ Average I T- Value T- Value Hole 3 = (T2) 0.00 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 // 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: 25.97 Not Suitable for Development Identify all suitable options 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) Tertiary Treatment System and Infiltration / treatment area (Section 10.2) No Yes Sub -surface: I 33.61 Suitable for Development Discharge Route' Groundwater Propose to install: Secondary Treatment System and soil polishing filter J) 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 raised mound soil polishing filter measuring 0.5m 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 due to the compact nature of the subsoil below 1.2m. 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. 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) 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 final effluent which may lead to clogging ' A discharge of sewage effluent to "waters" (definition includes any or any part of airy 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 (m3) Percolation Area Mounded Percolation Area No. of Trenches No. of Trenches Length of Trenches (m) Length of Trenches (m) Invert Level (m) 0 Invert Level (m) 0 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 IBAF TREATMENT SYSTEM Soil I I ICapacity PE 16 Constructed Wetland Sizing of Primary Compartment Other 2,90 I m3 Polishing Filter*: (Section 10.1) Surface Area (m2)" 30.00 Option 3 - Gravity Discharge 60.001 Trench length (m) Option 1 - Direct Discharge Surface area (m2) Option 4 - Low Pressure Pipe Distribution Option 2 - Pumped Discharge Trench length (m) 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 30.001 Surface area (t712) I 30.00 Surface Water `* Discharge Rate (m3/hr) 0.04 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 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 Q First Name: Michael Surname: Holohan Address: Iterera, Scotstown, Co Monaghan. Qualifications/Experience: GSI / EPA Certified. Date of Report: I 06 -Aug -2026 Phone: 0868169162 E-mail biolabsirl@outlook.com Indemnity Insurance Number: RPI-IE000946-00 Signature: SOIL AminPD SITE SUBSOIL TDCSs T S VULNERABILITY LOW BEDROCK DMSSL f I,;I++'i; RIVERS AND LAKES I AQUIFER CATEGORY Lm 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) S 'I ' • Jr • -' �'.r+r 1 _ ..r • r .K F • J� p 1 1 5 f' � ,,rip ' •. - ,rvII 1 l \_' / " jj 55 r \IsJ 1� ) ( /7. .Y l 1 � r \\iJa � r' 2/':" Prha 3gh i/I 1k73 ) ' N / q 1 � ! 9\ \ -' _ rc aj AERIAL VIEW OF PERCOLATION SITE J4oME DwELN r.,t)o ma 9c- Ql SKETCH OF PERCOLATION AREA INCLUDING SITE SURROUNDS ter. ._•_ _,, pFS ;v AI L••,• :3'71 f 9 l 1 ' Rf'1 tiL� y ?' i S TRIAL HOLE ON DAY OF EXCAVATION .. .. iii.4. , t'r •jam .. , « r TRIAL HOLE TWO DAYS AFTER EXCAVATION H Ti T2 T TEST HOLES F 4 4 r�. a 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 6 percolation trenches. The raised mound shall be 0.5m in height throughout its area and consist of the topsoil from the site. The mound shall measure 13m x 15m. 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 trenched 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 1m deep shall be employed upslope of 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 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 le 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 able 6.1 EPA Code of Practice 2021 unless stated otherwise TOPSOIL 100MM GEOTEXTILE LAYER 150MM WASHED STONE ABOVE PIPE O 100MM PIPE 0.6M 250MM WASHED STONE BELOW PIPE SUBSOIL MINIMUM 0.9M Compact subsoil MOUNDED TOPSOIL 0.5M INVERT OF NCH GROUND LEVEL EACH TRENCH 500MM WIDE SECTION THROUGH MOUNDED SUBSOIL PERCOLATION SYSTEM