Water Framework Directive. Groundwater Monitoring Programme. Site Information. Sillogue Well

Transcription

1 Water Framework Directive Groundwater Monitoring Programme Site Information Sillogue Well ImagePath1: Sillogue Well\IE_SH_G_19_014_a_Sampli nglocation.jpg Sillogue Well is a large spring that contributes to the Tullamore PWS. It has an average abstraction rate of 3,500 m³/day. August 2011

2 Site Name: RBD: Site Use: Sillogue Well Shannon IRBD Easting: Northing: Drinking Water (PWS) Hydrometric Area: 25 Townland: Ownership: Water Quality Monitoring Network: KILDANGAN County Council SITE INFORMATION County: EU Reporting Code: GWB Name: GWB Code: Drinking Water Code: Water Level Monitoring Network: Level IE_SH_G_232_19_014 Tullamore IE_SH_G_ PUB1020 Surveillance Operational (Point) Operational (Diffuse) N N Y N Flow Y Site Comments: Location and Access Information: SITE DIRECTIONS Additional Comments: Monitoring Point Type: Borehole Log Available: Top of Casing (m agl): Spring WELL INFORMATION Abstraction Rate (m³/d): 3500 Ground Elevation (m OD): 60 Total Drilled Depth (m bgl): n/a Depth to Bedrock (m bgl): Upper Casing Diameter (mm): Lower Casing Diameter (mm): Final Borehole Depth (m): Upper Casing Bottom Depth (m bgl) : Lower Casing Bottom Depth (m bgl): Screen Interval (m bgl): Grout Type (cement,bentonite): Gravel Pack Interval (m bgl): Potential Yield (m³/day): Screen Type (PVC,Steel,other): Screen Slot Size (mm): Grouted above (m bgl): Grout Volume Injected (m³): Gravel Pack Volume (m³): There is a report available from GES. Open Hole Interval (m bgl): Specific Capacity (m³/d/m): Comments on Monitoring Site: Static Water Level (m bgl): Scheme Name: Source Report Info: GES Tullamore PWS Number of Abstraction Points in the Scheme: Source Report Available Y Scheme Summary: Sillogue Spring contributes to the Tullamore PWS. Page 2 of 5

3 HYDROGEOLOGY GEOLOGY Soil: Subsoil: Bedrock: Cutaway/cutover peat (Cut) Peat (Cut) Dinantian Pure Bedded Limestones Subsoil Permeability: Low HYDROGEOLOGY ZONE OF CONTRIBUTION Aquifer Category: Estimated ZOC Size (): ZOC Delineation Comments: Rkd Vulnerability at Monitoring Moderate Flow Regime: Karstified site: 4.9 ZOC Delineated By: TOBIN (CK) Recharge Est Recharge (mm/yr): Estimate (mm/yr): There are numerous springs in the region around the main spring at Sillogue though the majority of these occur on the east side of the stream which flows through the forestry. Sillogue Spring is on the west side of this stream and it is assumed the ZOC occurs to the west. However, there is uncertainty with the groundwater flow directions. The regional river network is primarily E-W. The spring occurs on a synclinal axis and relatively close to a mapped fault. It is considered the most likely contributing area occurs west of the spring, and the ZOC takes account of broad topographic dip to the spring and the water balance (total discharge unknown). Further work is required to improve the conceptual model and the resultant boundaries may be different. The hydrochemistry suggests input from the gravels. 219 Groundwater Vulnerability within ZOC (% area): Extreme (X) 0 Extreme (E) 0 High Moderate Low 0 High to Low 2.07 Unclassified 0 Hydrochemical Signature: Alkalinity (mg/l HCO3): Hardness (mg/l CaCO3): Conductivity (us/cm): Monitoring Record Period: Pressure (e.g., Nitrates, Phosphates, Abstractions): Average: 352 Average: 400 Average: 750 From: 2007 Ca-HCO3 Range: Range: Range: To: 2010 HYDROCHEMISTRY Additional Water Chemistry Information: RISK ASSESSMENT During the monitoring period: The average nitrate concentration was 19 mg/l NO3 and the maximum nitrate concentration was 28 mg/l NO3. The average ammonium concentration was mg/l N and the maximum ammonium concentration was mg/l N. The average molybdate reductive phosphorus (MRP) concentration was mg/l P and the maximum MRP concentration was 0.01 mg/l P. The average chloride concentration was 19.8 mg/l Cl and the maximum chloride concentration was 28.5 mg/l Cl. Typical Contaminants: Risk Category: At risk, high confidence GWB Status: Good Impact Potential within ZOC (% area): Extreme: 0.00 High: Moderate: Low: Negligible: OTHER INFORMATION Page 3 of 5

4 Sampling Location Spring Water Level Page 4 of 5

5 Data Summary Sheet - July 2011 Disclaimer: The data in this document are based on the best available information and understanding at time of writing. Neither the Environmental Protection Agency, nor the individual bodies supplying data for this document and accompanying maps will be responsible for any loss or damage from the use or interpretation of these data. Rock Unit Geology Map: GSI, 2009 Aquifer Type Map: GSI, 2009 Groundwater Vulnerability Map: GSI, 2009 Soils & Subsoils Type: Teagasc, 2007 Recharge Map: GSI, 2009 Impact Potential Map: EPA, 2009 Risk Assessment Map: EPA WFD Risk Assessment, 2006 Groundwater Body Status: EPA WFD Status Assessment, 2008 Water Quality Data: EPA WFD Monitoring, 2008 Groundwater Threshold Values Groundwater threshold values for selected parameters: Nitrate - General Chemical Test/ Drinking Water Test (37.5 mg/i N03) Ammonium - Drinking Water Test (0.175 mg/i N) / Surface Water Test (0.065 mg/l N) Molybdate Reactive Phosphorus (MRP) - Surface Water Test (0.035 mg/i P) Chloride -Saline/Intrusive Test (24 mg/i) / Drinking Water Test (175 mg/i Cl) Electrical Conductivity -Saline/Intrusive Test (800 µs/cm) / Drinking Water Test (1,875 µs/cm) Further information on groundwater threshold values is contained in the Groundwater Regulations (S.I. No.9 of 2010). General Downgradient Distances General Downgradient Distances (XL) applied to boreholes sourced in bedrock aquifers are constrained to estimate approximate limits based on data at the GSl. ln some cases they may be higher or lower depending on local conditions. Rk, Rkd, Lk Lm Ll, PI 225 m 150 m 60 m It is assumed that groundwater downgradient of a spring cannot flow back up to the spring, however a precautionary 30m buffer is generally applied which allows for instances where pumping under dry weather periods may induce a drawdown or where the ground may be sloping toward the spring from the downgradient side. Version 0: Version 1: Version 2: Version 3: Version 4: Prepared by Date: Prepared by Tobin (CK) Date: Apr 2011 Prepared by Date: Prepared by Date: Prepared by Date: Page 5 of 5

6 !. / IE_SH_G_232_019_ Location Map for Silloge Well River

7 Ll Rkd Rkd Rkd!. / IE_SH_G_232_019_ Aquifer Category for Silloge Well River Ll Rkd

8 !. / IE_SH_G_232_019_ Bedrock Map for Silloge Well River Dinantian Pure Bedded Limestones Dinantian Pure Unbedded Limestones

9 !. / IE_SH_G_232_019_ Groundwater Vulnerability for Silloge Well E (Rock near surface or Karst) E (Extreme) H (High) M (Moderate) L (Low)

10 !. / IE_SH_G_232_019_ Subsoils Map for Silloge Well River Alluvium Cutover raised peat Esker comprised of gravels of basic reaction Gravels derived from limestones Lacustrine sediments Till derived from limestones

11 Soils Map for Silloge Well!. / IE_SH_G_232_019_ River Basic Deep Well Drained Mineral Basic Deep Poorly Drained Mineral Basic Poorly Drained Peaty Mineral Basic Shallow Well Drained Mineral Basic Shallow Poorly Drained Mineral Basic Shallow Poorly Drained Peaty Mineral Basic Shallow/Rocky/Peaty Mineral Cutover/Cutaway Peat Mineral Alluvium Marl-type Alluvium Lacustrine