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Hydrogeologic Investigation and Groundwater Modeling Report
All documents presented in Adobe Acrobat PDF Format.
Complete Report Documents
- Hydrogeologic Investigation and Groundwater Modeling Report (227 kb, 58 pages)
- Reference Documents (45.8 mb, 602 pages)
For ease of use, the above documents have been broken into smaller sections.
Contents
Section 1 Introduction (67 kb, 4 pages)
- 1.1 Site Location 1-2
- 1.2 Environmental Setting 1-2
- 1.2.1 Climate 1-2
- 1.2.2 Topography and Drainage 1-2
- 1.2.3 Hydrogeology 1-3
- 1.3 Project Scope 1-4
Section 2 Hydrogeologic Investigation (62 kb, 2 pages)
- 2.1 Fly Ash Sampling 2-1
- 2.2 Groundwater and Surface Water Analyses 2-1
- 2.3 Aquifer Performance Test 2-1
- 2.4 Investigation Derived Waste 2-2
- 2.5 Additional Data Sources 2-2
Section 3 Hydrogeologic Investigation Results (64 kb, 8 pages)
- 3.1 Site-Specific Geology 3-1
- 3.2 Groundwater Flow 3-2
- 3.3 Groundwater and Surface Water Quality 3-2
- 3.3.1 Initial Data Screening 3-3
- 3.3.2 Detailed Constituent Analysis 3-4
- 3.4 Groundwater and Surface Water Conclusions 3-5
- 3.4.1 Constituent Concentrations 3-5
- 3.4.2 Constituent Spatial Distributions 3-8
Section 4 Groundwater Model Data Review (54 kb, 4 pages)
- 4.1 Modeling Review and Previous Reports 4-1
- 4.2 Hydrogeologic Data Review 4-2
- 4.2.1 Aquifer Performance Test Analysis 4-2
Section 5 Hydrologic Analysis (54 kb, 4 pages)
- 5.1 Recharge, Drainage and Ponds 5-1
- 5.2 Leachate Production Rates (HELP Model) 5-3
Section 6 Groundwater Flow Model (72 kb, 10 pages)
- 6.1 Model Code 6-1
- 6.2 Model Domain and Computational Grid 6-2
- 6.3 Hydrogeologic Layers and Properties 6-2
- 6.4 Boundary Conditions 6-4
- 6.4.1 Model Perimeter 6-4
- 6.4.2 Rivers and Streams 6-4
- 6.4.3 Agricultural Drainage 6-5
- 6.4.4 Onsite/Golf Course Ponds 6-5
- 6.4.5 Recharge and Evapotranspiration 6-6
- 6.4.6 Groundwater Withdrawals 6-7
- 6.5 Flow Model Calibration and Sensitivity 6-7
- 6.5.1 Aquifer Performance Test Transient Calibration 6-7
- 6.5.2 Steady State Calibration 6-8
- 6.5.3 Model Sensitivity 6-9
- 6.6 Simulated Groundwater Flow Field and Water Budget 6-10
Section 7 Transport Model (75 kb, 10 pages)
- 7.1 Model Code 7-2
- 7.2 Input Parameters 7-2
- 7.2.1 Source Representation 7-2
- 7.2.2 Transport Parameters 7-7
- 7.3 Transport Simulations 7-8
- 7.4 Sensitivity Analysis 7-10
Section 8 Conclusions (69 kb, 8 pages)
- 8.1 Current Water Quality Conditions 8-1
- 8.2 Groundwater Flow 8-1
- 8.3 Future Water Quality Conditions 8-3
- 8.3.1 HELP Model Infiltration Rates 8-5
- 8.3.2 Arsenic Migration 8-6
- 8.3.3 Nitrate Migration 8-6
- 8.4 Future Land Use Considerations 8-7
Section 9 References (73 kb, 3 pages)
Figures (18.7 mb, 60 pages)
- 1-1 Site Location Map
- 1-2 Site Vicinity Map
- 1-3 Climate Data
- 1-4 Generalized Hydrogeologic Section
- 1-5 Data Collection Locations
- 3-1 Boring Log Summary
- 3-2 Surficial Aquifer Sand Zone Structure Contour Map
- 3-3 Yorktown Confining Zone Structure Contour Map
- 3-4 Yorktown Aquifer Structure Contour Map
- 3-5 Surficial Aquifer Potentiometric Surface Map
- 3-6 Yorktown Aquifer Potentiometric Surface Map
- 3-7 Constituent Distributions in Groundwater
- 3-8 Constituent Distribution in Groundwater
- 4-1 Aquifer Performance Test Well Locations
- 4-2 MW-3A/MW-3B Observed Water Levels
- 4-3 PZ-1/PZ-2 Observed Water Levels
- 4-4 MW-3C Observed Water Levels
- 4-5 MW-5A/MW-5C Observed Water Levels
- 4-6 Aquifer System Cross Section
- 5-1 USGS Stream Flow Gauge Average Stream Flow Values
- 6-1 Model Domain and Computational Grid
- 6-2 On-site Model Computational Grid
- 6-3 Cross-Section AA East-West
- 6-4 Cross-Section BB North-South
- 6-5 Land Surface Elevations
- 6-6 Surficial Aquifer Base Elevation Map
- 6-7 Yorktown Confining Zone Base Elevation Map
- 6-8 Yorktown Aquifer Base Elevation Map
- 6-9 Land Use
- 6-10 Drainage Ditches
- 6-11 Golf Course Ponds and Staff Gauge Locations
- 6-12 Yorktown-Eastover Aquifer Pumping Location
- 6-13 Aquifer Performance Test Well Locations
- 6-14 Aquifer Performance Test Simulated and Observed Drawdowns
- 6-15 Aquifer Performance Drawdown
- 6-16 Upper Surficial Aquifer – A Wells – APT Model
- 6-17 Lower Surficial Aquifer – B Wells – APT Model
- 6-18 Upper Yorktown-Eastover Aquifer – C Wells – APT Model
- 6-19 Upper Surficial Aquifer – A Wells – High Flow Model
- 6-20 Lower Surficial Aquifer – B Wells – High Flow Model
- 6-21 Upper Yorktown-Eastover Aquifer – C Wells – High Flow Model
- 6-22 Upper Surficial Aquifer Flow Vectors - High Flow Model
- 6-23 Simulated Head Contours – East-West Cross Section
- 6-24 Simulated Head Contours – North-South Cross Section
- 7-1 Ash Fill Emplacement Area
- 7-2 through 7-9 Simulated Arsenic in Upper Columbia Aquifer
- 7-10 through 7-13 Simulated Nitrate in Upper Columbia Aquifer
- 7-14 Time History of Simulated Constituent Concentrations – Surficial Aquifer
- 8-1 Conceptual Hydrogeologic Model
Tables (629 kb, 25 pages)
- 1-1 Data Collection Locations
- 2-1 Fly Ash Data Summary
- 2-2 Surface Water Data Summary
- 2-3 Groundwater Data Summary
- 2-4 Duplicate Sample Data Summary
- 2-5 General Water Quality Parameters
- 3-1 Water Level Data
- 3-2 Water Quality Data Summary Statistics
- 3-3 Water Quality Data Analysis
- 4-1 APT Well Construction
- 4-2 AQTESOLV Results
- 5-1 Summary of HELP Model Simulations and Calculated Leachate Production Rates
- 6-1 Groundwater Model Layers
- 6-2 Assigned Model Hydraulic Properties
- 6-3 Steady State Model Calibration Results: Aquifer Performance Test Model
- 6-4 Steady State Model Calibration Results: High Flow Model
- 6-5 Water Budget for Steady State Calibration: APT and High Flow Model
- 7-1 Transport Analysis Constituents
- 7-2 Summary of Initial Source Loading Rates and Source Decay Parameters
- 7-3 Transport Parameters
Appendices
- Appendix A – Fly Ash Laboratory Report (7.2 mb, 73 pages)
- Appendix B – Groundwater and Surface Water Laboratory Reports (1.45 mb, 293 pages)
- Appendix C – Aquifer Performance Test Hydrographs (4.26 mb, 3 pages)
- Appendix D – Comprehensive Water Quality Data Base (344 kb, 117 pages)
- Appendix E – Water Quality Quantile Plots (895 kb, 31 pages)