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HomeMy WebLinkAbout2687 - Site Assessment Reportiir ©ff1U©11 FOR RYAN McKENNA, GOLAN, 11 VIDAVNET, CO. MONAGHAN. 02SEP2n2G Iw REF. F. NO. APPENDIX A: SITE CHARACTERISATION FORM File Reference: Ryan McKenna, Golan, Tydavnet, Co Monaghan Prefix: Mr First Name: Ryan I Surname: McKenna Address: Site Location and Townland: Golan, Tydavnet, Co Monaghan 1 Golan, Tydavnet, 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 ® Private Well/Borehole Group Well/Borehole Soil Type, (Specify Type): Subsoil, (Specify Type): Surface and ground water gleys AminPD Sandstone and shale till. TLCSsS Bedrock Type: DPBL Aquifer Category: Regionally Important I Locally Important LI Poor Vulnerability: Extreme O High j Moderate Low E11 Groundwater Body: tKnockatalton Status IGood Name of Public/Group Scheme Water Supply within 1 km: ITydavnet GWS I Source Protection Area: ZOC SI ❑ SO Li Groundwater Protection Response: R1 Presence of Significant Sites (Archaeological, Natural & Historical): Past experience in the area: \lone Some good soil for percolating near this 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: Elevated on Easterly facing slope. Slope: Steep (>1:5) ❑ Shallow (1:5-1:20) I✓ Relatively Flat (<1:20) Slope Comment ABOUT 1: 18 Surface Features within a minimum of 250m (Distance To Features Should Be Noted In Metres) Houses: Home dwelling house 66m South South-West. Dwelling house 92m North. Poultry units 141m East North-East. Existing Land Use: Good agricultural land. L Vegetation Indicators: Grass. Groundwater Flow Direction: Expected East. Ground Condition: Firm during a spell of warm weather with high temperatures. Site Boundaries: Mature hedges all around. 3.1 Visual Assessment (contd.) Roads: Local road along Eastern boundary of the site and regional road 85m East. Outcrops (Bedrock And/Or Subsoil): None Surface Water Ponding: None Lakes: Killylough 1.85m South -East. Beaches/Shellfish Areas: None Wetlands: None Karst Features: None Watercourses/Streams:* Cloughfin river 71 m North. *Note and record water level 3.1 Visual Assessment (contd.) Drainage Ditches:* No ditch 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 a period of 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): Ii2.1 Depth from ground surface _ Depth from ground surface to bedrock (m) (if present): r1 to water table (m) (if present): 1.9 Depth of water ingress: 0.21 Rock type (if present): Date and time of excavation: 08 Jul 2026 I 14:00 Date and time of examination: 10 -Jul -2026 I 09:30 Depth of Surface and Subsurface Soil/Subsoil Percolation Texture & Plasticity and Soil Density/ Colour**** Preferential Tests Classification** dilatancy*** Structure Compactness flowpaths 0.1 m 0.2m1 0.3m1 I 0.4m 0 0.5 m II 0.6m1___ 0.7 m I 0.8m ISS 0.9m II 1.0m I 1.1m (_ 1.2 m 0 1.3m 0 1.4 m II 1.5 m II 1.6m 1.7m I 1.8 m _1 1.9m 2.0 m I 2.1 m II 2.2 m 0 2.3m II 2.4 m 2.5m II 2.6m II 2.7 m 1 2.8m I1 2.9 m l� 3.0m II 3.1m I i 3.2m1 3.3 m 3.4m II 3.5m I SILT/CLAY TOP SOIL SILT / CLAY subsoil 0O0 UI 11101 I IU10 Lull 3 threads —70mm CRUMB ribbons — dilatant 2 threads - 60mm GRANULAR ribbons - dilatant Likely Subsurface Percolation Value: I 30 Likely Surface Percolation Value: 20 SOFT UNCOMPACT BROWN GRASS ROOTS PALE BROWN NONE 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 2.1 m deep with two distinct layers. Top -soil that was crumb in nature and below that sub -soil that was a granular in nature and pale brown in colour with about 20% gravel and 10% cobbles. The water table was at 1.9m after a 48hrs.Good aerated soil with no massive yellow or blue clay visible. 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] 2 400 400 400 800 800fl 800 400 ��400 400 Dimensions of hole 290 x 310 290 x 300 310 >; 320 [length x breadth (mm)] Step 2: Pre -Soaking Test Holes Pre-soak start Date 08 -Jul -2026 08 -Jul -2026 08 -Jul -2026 Time I17:00 17:00 17:00 2nd pre-soak Date 09 -Jul -9 I 09 -Jul -2026 09 -Jul -2026 start Time 11301 11:30 I 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 10-07-2026 10-07-2026 10-07-2026 Time filled to 400 mm I 09:30 09:30 09:301 Time water level at 300 mm I 10:35 F 10:451 10:30 Time (min.) to drop 100 mrn (1) I 65.00 75.00j I 60.00 Average T1c0 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; 66.67 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) 1 10:35 11:4511 70.00 10:40 11:55 75.00 10:35 11:5011 75.00 2 11:4511 13:3011 105.00 11:55 13:4511 110.00 11 :50 13:40 110.00 3 13:30 16:50 200.00 14I 17:10 205.00 13:40 17:00 200.00 Average At D�A =128-33 130.00 Value Average At/4 = Average At/4 = Average At/4 = _ [Hole No.1] I 31.25 (t,) [Hole No.2] I 32.501(t2) [Hole No.3] 32.081(t3) Result of Test: Subsurface Percolation Value = 31.94 (min/25 mm) Comments: The T test was a pass and this soil will be suitable to polish final effluent from an advanced treatment system. Step 5: Modified Method (where T,oa > 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 tall = T, Value = T, hh:mm hh:mm (mins) IT = 4.45 = T, hh:mm hh:mm (mins) / T = 4.45 =Tm /K,s =T, • /K,, 300 - 250 8.1 � 0.00 �� 300- 250 8.1 =� 0.00 t[ 250 - 250 9.7 =0 0.00 I[J 250 - 200 9.7 0� 0.00 == 200 - 150 0.00 200 - 150 11.9 =� 0.0011 11.9 0000 150 - 100 14.1 0� 0.00 IF 0 150- 100 I14.1 0.00!! 1111111] Average T- Value T- Value Hole 1 = (1,) 0.001 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- Comments: in hole (mm) Factor Time Tim§e of fall = T, Value =T, hh:mm hh:mm (mins) /T,, = 4.45 =T /Ks 300 - 250 I 8.1 �� 0.00 0 0� 250 - 200 9.7 �� 0.00 = 200-150 Li.9 0.0011 150-100 __ 14.1 �� 0.0011 � Average T- Value T- Value Hole 3 = (12) 0.00 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 400 400 400 to base of hole (mm) Depth of hole (mm) I 40011 400 I 1 400 Dimensions of hole [length x breadth (mm)] 290 x 290 300 x 280 280 x 280 Step 2: Pre -Soaking Test Holes Pre-soak start Date 08 -Jul -2026 08 -Jul -2026 08 -Jul -2026 Time T 17:05 17:05 17:05 2nd pre-soak Date 09 -Jul -2026 09 -Jul -2026 09 -Jul -2026 start Time 11:35 11:35 I 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. Date of test ( 10 -Jul -26 H 10 -Jul -26 1 1 10 -Jul -2026 Time filled to 400 mm 09:35 II 09:3511 09:35 Time water level at 300 mm F 10:35 10:3511 10:40 Time to drop 100 mm (T,00) 60.00 60.00 II 65.00 61.67 Average Ti., If T,00 > 480 minutes then Surface Percolation value >90 - site unsuitable for discharge to ground If T,00 ≤ 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 10:35 11:401165.00 10:35 11:3511 60.00 10:40 11:5011 70.00 2 11:401113:1011 90.00 11:35 13:0011 85.00 11:501113:2511 95.001 g 13:101115:4011 150.001 13:00 15:3011 150.00 13:25 16:0011 155.00 Average AT 98.33 T 106.67 101.67 Value Average AT/4 = [Hole No.1] 25.42,(T1) Average AT/4 =___________ [Hole No.2] I 24.581(T2) Average AT/4 = [Hole No.3] I 26.671(T3 Result of Test: Surface Percolation Value = 25.56 (min/25 mm) Comments: "he topsoil at this site is of good quality and may be used if required to build the percolation area up level. 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 Start Finish Time K, T - Factor Time Time of fall = T, Value = T, hh:mm hh:mm (mins) / Tm = 4.45 =T /K„ 8.1 =� 0.00 l I= Fall of water in hole (mm) 300 - 250 Time Start Finish Time K,s T — Factor Time Time of fall = T Value = T, hh:mm hh:mm (mins) / T = 4.45 =T I 8.1 0.00 l0 300 - 250 250 - 200 9.7 0.00 l 250 - 200 9.7 =� 0.00 II 200 - 150 11.9 =� 0.0011_ 200 - 150 11.9 0.00 j� 150 - 100 14.1 DO 0.00 �� 150 - 100 14.1 0 0.0011= Average T Value T- Value Hole 1 = (T1) 0.00 Average T- Value T- Value Hole 2 = (TZ) 0.001 Result of Test: Surface Percolation Value Percolation 0.00 (min/25 mm) 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) / Tn = 4.45 =T 300 - 250 8.1 0.00 l 0 250 - 200 9.7 == 0.00 200-150 11.9 == 0.00 150 - 100 14.1 == 0.0011_I � 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: 1:18 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: 25.56 Sub -surface: I 31.941 Not Suitable for Development II Suitable for Development 0 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 Yes (Section 10.1) 3. Tertiary Treatment System and Infiltration / Yes treatment area (Section 10.2) Discharge Route' Groundwater Propose to install: Secondary Treatment System and soil polishing filter El I 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 soil polishing filter to be installed and constructed to EPA 2021 specifications. 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. 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 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 (m3) Percolation Area Mounded Percolation Area No. of Trenches I No. of Trenches I Length of Trenches (m) 10.001 Length of Trenches (m) Invert Level (m) 0.60 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 BAF TREATMENT SYSTEM Soil �� Capacity PE 6 Constructed Wetland t I Sizing of Primary Compartment Other i P I 2.901 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) I 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 * (l/rn2.d) I 30.00 Surface area (m2) 30.00 Surface Water'" Discharge Rate (m3/hr) 0.04 * 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 0 First Name: jhaeI Surname: IHolohan Address: Iterera, Scotstown, Co Monaghan. Qualifications/Experience: GSI / EPA CERTIFIED Date of Report: 11 -Jul -2026 Phone: I 0868169162 E-mail biolabsirl@outlook.com Indemnity Insurance Number: RPI-1E000946-00 Signature: I4I IMYKINNi(,H r. x j r 02 SE ,, WELLS AND BOREHOLES ADJACENT TO THE SITE Li Public Supply Source Protection Areas SI-Inner Protection Area SO -Outer Protection Area S'1TE .���.:� P LANNING DF ARr MENT HER. NO. i, MONAGHAN CO. COUNCIL_ SOURCE PROTECTION DATA (N/A) RIVERS AND LAKES a AQUIFER CATEGORY Lk VULNERABILITY LOW m BEDROCK DPBL IAd AERIAL_., VIEW OF PERGOLA -ION SITE T N Mi4Th / Ric-�QN,�z / LOCAL r' TRIAL P�. 4cL.c 1z f )r '- )- ;- • - I, I i-fv tsc: t r --' / LIi -'/-- SKETCH OF PERCOLATION AREA INCLUDING SITE SURROUNDS rti ,Rnr5�� I i J _ Yr i� w 1'`�5' "' 4 t•r t , ,� 1 kt 1 ,. N i - i � i lfr ►. , i .y' i ,� , . �� 3�1 kr '. .�M'•lil M�� �., r 1 � '�� F� 5 f. J 1 �i' j. FI' !'. �.. /'yam i , �, l j } j '► � _, ♦.1. iat .- t%;1r .t , 4tt "f.r3 ��1 1 , `.�fi !` ,. y. •ti. FI.. r ' j C YHP ►wl y • uw E �(+ t k.^' ,Sti}ri�t+e�'a` „r � ►. tj, ;.s� 6. r�rr^ f• ay. i� a- r � dirt •"s r , . "Vi at ` r t (r tfi'' J ` t ,dk,{fr�� . -�:� ' „ r +►} r"r,�n�c°1 %�"�?r(i�yi��! 1�"�!fl � r j , • -r'IiA t•.:e. j $Y111rf�: J -� s' t .A ♦l - J t..b L:I a:�X.n VIEWS OF PERCOLATION SITE N. VIEWS OF PERCOLATION SITE TRIAL HOLE ON DAY OF EXCAVATION + s _ Are, r+ a .�, ..�� r• x , " _ .J._•.':1 1 c 1 .� t ! ti• G r � -.r '' i � , �} �'` \•` `, Sty, P�'Qp� rt L4.. ►r P.ir{ . •al t� .,[r�� TRIAL HOLE TWO DAYS AFTER EXCAVATION Ti T2 T3 T TEST HOLES P1 P2 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 feeding the 6 percolation trenches. 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 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. 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 ble 6.1 EPA Code of Practice 2021 unless stated otherw GROUND LEVEL TOPSOIL 100MM GEOTEXTILE LAYER 150MM WASHED STONE ABOVE PIPE 0.6M 100MM PIPE 250MM WASHED STONE BELOW PIPE INVERT OF TRENCH SUBSOIL MIN 0.9M WATER TABLE EACH TRENCH 500MM WIDE SECTION THROUGH SUBSOIL PERCOLATION SYSTEM