Full-scale Aquifer Test Approach for a High Water-Demand Project. Watertech 2016 Andre Laforest, P.Eng., M.Sc. Hydrogeologist HCL
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2 Full-scale Aquifer Test Approach for a High Water-Demand Project Watertech 2016 Andre Laforest, P.Eng., M.Sc. Hydrogeologist HCL
3 Plan Regulatory background Technical background Match Plan Exploratory program Regional context / Hydrosystem description Field work Pilot test Numerical model Outcomes
4 Regulatory Background Post-Walkerton Effect Environment Quality Act Regulation respecting the Quality of Drinking Water Groundwater Catchment Regulation Directives and Guidelines Province wide Municipal Reorganization (mergers)
5 Technical Background Surface Water Source (lake) + Disinfection Shrinking Water Source Frequent [THM] and Turbidity Non-Compliance
6 Match Plan Ministerial Order New Water Supply (2 concurrent approaches) for the Amalgamated Town Municipality Population 27,000 + Industrial / Commercial / Institutional Current Daily Needs = 14,380 cu.m./day
7 Exploratory Program Phase 1 - Exploration 12 Sectors / Aquifers Preliminary Work: Geophysics, Exploratory Drilling and Aquifer Testing Conclusion: Expand Search Area
8 Exploratory Program Phase 2 - Exploration 5 Sectors/Aquifers Preliminary Work: Geophysics, Exploratory Drilling and Aquifer Testing Conclusion: one Potentially Outstanding Aquifer with High Environmental Impact
9 Exploratory Program Phase 3 - Regulatory Approval Opposition: Local Municipality, Citizen Group, Environmental Groups Legal Actions Were Enforced Exploratory Program / Mitigation Plan
10 Exploratory Program Phase 3 - Regulatory Approval Wetland Agriculture Resident Rivers and Spawning Areas Fauna and Flora
11 Exploratory Program Phase 3 - Regulatory Approval Access Roads and Power Line (winter) Drilling and Well Development (no release) Pilot Test and Impact Monitoring Dismantling Social Licence: Negotiation, Implementation, Monitoring, Mitigation and Emergency Response
12 Exploratory Program Phase 4 - Preparation to Pilot Test 12 Exploratory Drillings 16 Observation Wells 2 Pumping Wells (+ 1 from phase 2) 3 Early Detection Observation WW 13 Wetland Monitoring Stations 7 River Flow Monitoring Stations
13 Testing program Phase 5 - Pilot Test Hydro-Stratigraphic Units Properties: Individual Tests Technical Assessment of Aquifer Capabilities: 5-month pilot test 1 pilot test at low water conditions 1 flood simulation
14 Reporting Program Phase 6 - Reporting Hydrosystem Characterization Synthesized Study Detailed Studies Groundwater and Surface Water Chemistry Environmental Impact Assessment Design and Estimates
15 Conceptual Model
16 Conceptual Model Area Geography
17 GCM - Hydrosystem
18 Leading Factors Component Desired impact Measure River Flow 10% Q2-7 Monitoring Wetland Minimal Monitoring Groundwater Users Agriculture Trace WHPA Rules Monitoring Calculation and Compensation
19 Time Line feb mar apr may jun jul aug sep oct nov dec jan
20 Testing Program Preliminary Aquifer and Well Tests Pilot Test - Monitoring True Scale Diversion vs Time Line True Scale Water Quality Testing True Scale Impacts Low Water Aquifer Test
21 Pilot Test - Control Points
22
23 Individual Aquifer and Well Tests Thetford Mines Pumping well: PE-4 Observation: PE m.cu./min Drawdown (m) 5.35 m.cu./min 2.66 m.cu./min 1.33 m.cu./min time (min)
24 Pilot Test - Groundwater Levels pumping site PE-2 PE-3 PE-4 04-mar 25-mar 15-apr 06-may 27-may 17-jun 08-jul 29-jul 19-aug 09-sep 30-sep 21-oct 11-nov
25 Pilot Test - River Impact
26 Pilot Test - Vertical Gradients Wetland and Surroundings 23-may 26-aug
27 Water Chemistry Results Surface Water: High Colour, High and Variable Coliform, TOC and P Groundwater: Compliant with Drinking Water Standards Groundwater and Surface Water Hydraulically Connected Non-GWUDI according to Micro and Chemistry Results Groundwater Vulnerable according to DRASTIC Low Risk of Contamination
28 Numerical Model 5 Hydro-Stratigraphic Units Boundary Conditions recharge (5 zones) constant head (bedrock unit) rivers and streams drain Simulations flow before and end of pilot test optimal yield - natural conditions and artificial recharge optimal pumping installation
29 Numerical Model 5 Hydro-Stratigraphic Units Boundary Conditions recharge (5 zones) constant head (bedrock unit) rivers and streams drain Simulations flow before and end of pilot test optimal yield - natural conditions and artificial recharge optimal pumping installation
30 Numerical Model 5 Hydro-Stratigraphic Units Boundary Conditions recharge (5 zones) constant head (bedrock unit) rivers and streams drain Simulations flow before and end of pilot test optimal yield - natural conditions and artificial recharge optimal pumping installation
31 Numerical Model 5 Hydro-Stratigraphic Units Boundary Conditions recharge (5 zones) constant head (bedrock unit) rivers and streams drain Simulations flow before and end of pilot test optimal yield - natural conditions and artificial recharge optimal pumping installation
32 Numerical Model 5 Hydro-Stratigraphic Units Boundary Conditions recharge (5 zones) constant head (bedrock unit) rivers and streams drain Simulations flow before and end of pilot test optimal yield - natural conditions and artificial recharge optimal pumping installation
33 Recommendation
34 Cost Comparison Groundwater Solution Surface Water Solution Dual Preliminary Study $4.2M Water Intake $9.3M $12.1M Pipeline Water Conditioning $34.3M $16.2M $30.7M Other $7.0M $7.0M Total (incl. contingencies) $54.8M $70.2M Operation $0.6M/y $1.4M/y
35 Finance Preliminary Estimate Groundwater Solution Surface Water Solution Canada $17.0M $18.9M $25.2M Quebec $17.0M $18.9M $25.2M Thetford Mines $17.0M $17.0M $17.0M Total $51.0M $54.8M $67.4M
36 Conclusions 2 Sustainable Solutions: Groundwater Solution: Potential Environmental Impact Social Licence Issue: Regional (NIMBY) Surface Water Solution: Actual Environmental Impact: Provincial Park Social Licence Issue: Local (water tax) Politics rule
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