Water Framework Directive. Groundwater Monitoring Programme. Site Information. Drum Bingahamstown

Transcription

1 Water Framework Directive Groundwater Monitoring Programme Site Information Drum Bingahamstown ImagePath1: Drum Bingahamstown\IE_WE_G_16_ 1_a_Spring.jpg Drum Binghamstown is a spring that is used for a group water supply. The abstraction rate is 7 m³/day. August 211

2 Site Name: RBD: Site Use: Drum Bingahamstown WRBD Easting: Northing: Drinking Water (GWS) Hydrometric Area: 33 Townland: Ownership: Water Quality Monitoring Network: Drum Binghamstown Group Water Scheme EMLYBEG (Kyle) SITE INFORMATION County: EU Reporting Code: GWB Name: GWB Code: Drinking Water Code: Water Level Monitoring Network: Level IE_WE_G_65_16_1 Belmullet SG IE_WE_G_65 22PRI247 Surveillance Operational (Point) Operational (Diffuse) Y N Y N Flow Y Site Comments: Location and Access Information: SITE DIRECTIONS Located 3 west of Belmullet, off the R313. The spring is located in a field, approximately 3m off the R313. The sample is taken directly from the spring source. The GWS has a right of way across the field. Additional Comments: Monitoring Point Type: Borehole Log Available: Spring WELL INFORMATION Abstraction Rate (m³/d): 7 Ground Elevation (m OD): 1 Total Drilled Depth (m bgl): n/a Depth to Bedrock (m bgl): Top of Casing (m agl): 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): Open Hole Interval (m bgl): The abstraction rate in recent years was up to 14 m³/ d. In 21, as a result of metering, the abstraction rate has been reduced to 7 m³/d. Specific Capacity (m³/d/m): Comments on Monitoring Site: Static Water Level (m bgl): Scheme Name: Source Report Info: Drum Bingahamstown GWS Number of Abstraction Points in the Scheme: 1 Source Report Available N Scheme Summary: Drum Bingahamstown is a GWS that consists of two springs that merge into one stream. Page 2 of 5

3 HYDROGEOLOGY GEOLOGY Soil: Subsoil: Bedrock: Blanket peat (BktPt) Peat (BktPt) Precambrian Quartzites, Gneisses & Schists Subsoil Permeability: Low HYDROGEOLOGY ZONE OF CONTRIBUTION Aquifer Category: Estimated ZOC Size (): ZOC Delineation Comments: Lg Vulnerability at Monitoring High to Low Flow Regime: Intergranular site:.24 ZOC Delineated By: Tobin (CK) Recharge Est Recharge (mm/yr): Estimate (mm/yr): Hydrochemistry indicates shallow groundwater feeds the spring. Flattish topography and assumed flattish groundwater gradients make it difficult to locate boundaries. There is a spring/stream located to the west draining directly to the sea and the western boundary is assumed to be located betweent the two springs, approximately halfway between the two. This is in combination with the water balance provides for the delineated ZOC. 792 Groundwater Vulnerability within ZOC (% area): Extreme (X) Extreme (E) High Moderate Low High to Low 1 Unclassified Hydrochemical Signature: Alkalinity (mg/l HCO3): Hardness (mg/l CaCO3): Conductivity (us/cm): Monitoring Record Period: Pressure (e.g., Nitrates, Phosphates, Abstractions): Average: 267 Average: 29 Average: 679 From: 27 Ca-HCO3 Range: Range: Range: To: 21 HYDROCHEMISTRY Additional Water Chemistry Information: RISK ASSESSMENT During the monitoring period: The average nitrate concentration was 4 mg/l NO3 and the maximum nitrate concentration was 8 mg/l NO3. The average ammonium concentration was.177 mg/l N and the maximum ammonium concentration was.295 mg/l N. The average molybdate reductive phosphorus (MRP) concentration was.32 mg/l P and the maximum MRP concentration was.82 mg/l P. The average chloride concentration was 72.7 mg/l Cl and the maximum chloride concentration was 86.5 mg/l Cl. Typical Contaminants: Risk Category: Not at risk, high confidence GWB Status: Good Impact Potential within ZOC (% area): Extreme:. High:. Moderate:. Low:. Negligible: 1. OTHER INFORMATION The water is treated with chlorine. Page 3 of 5

4 Two springs Water Level Measurement Spring Page 4 of 5

5 Data Summary Sheet - July 211 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, 29 Aquifer Type Map: GSI, 29 Groundwater Vulnerability Map: GSI, 29 Soils & Subsoils Type: Teagasc, 27 Recharge Map: GSI, 29 Impact Potential Map: EPA, 29 Risk Assessment Map: EPA WFD Risk Assessment, 26 Groundwater Body Status: EPA WFD Status Assessment, 28 Water Quality Data: EPA WFD Monitoring, 28 Groundwater Threshold Values Groundwater threshold values for selected parameters: Nitrate - General Chemical Test/ Drinking Water Test (37.5 mg/i N3) Ammonium - Drinking Water Test (.175 mg/i N) / Surface Water Test (.65 mg/l N) Molybdate Reactive Phosphorus (MRP) - Surface Water Test (.35 mg/i P) Chloride -Saline/Intrusive Test (24 mg/i) / Drinking Water Test (175 mg/i Cl) Electrical Conductivity -Saline/Intrusive Test (8 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 21). 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 15 m 6 m It is assumed that groundwater downgradient of a spring cannot flow back up to the spring, however a precautionary 3m 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 : Version 1: Version 2: Version 3: Version 4: Prepared by Date: Prepared by Tobin (CK) Date: Feb 211 Prepared by Date: Prepared by Date: Prepared by Date: Page 5 of 5

6 Location Map for Drum/Binghamstown Abstractions

7 Lg Pl Pl Pl Aquifer Category Map for Drum/Binghamstown Abstractions Lake Pl Lg Fault

8 Lg Bedrock Map for Drum/Binghamstown Abstractions Lake Precambrian Quartzites, Gneisses & Schists Lg

9 Groundwater Vulnerability Map for Drum/Binghamstown Abstractions Lake E (Rock near surface or Karst) M (Moderate) Water E (Extreme) L (Low) No Data H (High) HL (unmapped - High to Low)

10 Subsoils Map for Drum/Binghamstown Abstractions Lake Blanket peat Windblown sands Gravels derived from metamorphic rocks Till derived from metamorphic rocks Bedrock outcrop or subcrop

11 Soils Map for Drum/Binghamstown Abstractions Lake Acid Deep Well Drained Mineral Acid Shallow Poorly Drained Mineral Aeolian (Undifferentiated) Acid Deep Poorly Drained Mineral Acid Shallow/Rocky/Peaty Mineral Acid Shallow Well Drained Mineral Blanket Peat