Title Page
ABSTRACT
국문 초록
Contents
PART 1. PERFORMANCE ANALYSIS FOR THE CONTAMINATED GROUNDWATER CONTROL SYSTEM 18
1. INTRODUCTION 18
2. MATERIALS &METHODS 20
2.1. Pulsed pump-and-treat 20
2.2. Numerical modeling 23
2.3. Analysis 25
3. RESULTS AND DISCUSSION 27
3.1. Groundwater pumping system for groundwater capture 27
3.2. Operation of injection wells for groundwater capture 32
3.3. Pulsed pump-and-treat 40
4. CONCLUSION 45
PART 2. VAPOR INTRUSION RISK ASSESSMENT AT A SITE OPERATING PULSED PUMP-AND-TREAT 46
1. INTRODUCTION 46
2. MATERIALS AND METHODS 47
2.1. Research site 47
2.2. Numerical modeling 50
2.3. Vapor intrusion risk assessment 55
3. RESULTS AND DISCUSSIONS 57
3.1. Numerical analysis of the research site 57
3.2. Effects of pump-and-treat on TCE plume 61
3.3. Vapor intrusion risk assessment 64
4. CONCLUSIONS 66
REFERENCES 67
Table 1. Modeling cases 24
Table 2. Source-Pathway-Receptor Conceptual site model 48
Table 3. Hydrogeological properties 51
Table 4. Transient contaminant transport simulation 53
Table 5. Modeling cases 54
Table 6. Contaminated groundwater concentration 65
Table 7. Vapor intrusion risk assessment 65
Figure 1. Pulsed pump-and-treat (a) Schematic diagram of the pump-and-treat system; (b) Continuous and pulsed operation. 22
Figure 2. Numerical simulation on groundwater flow field around a single pumping well; (a) numerical model of groundwater capture by single pumping well with the... 29
Figure 3. Numerical simulation on groundwater flow field and analysis on the total capture width around two pumping wells with different separation distances (dp); (a)...[이미지참조] 31
Figure 4. Effects of injection well directions on capture width; (a) Numerical models to validate the effects of the injection well directions (dpi=26m, θ=0°, 45°, 90°, 135°) (grid...[이미지참조] 33
Figure 5. Effects of dpi on capture width; (a) Numerical model to validate the effect of the pumping well-injection well distance (dpi=4, 12, 16, 20m, θ=0°) (grid frame x:190-...[이미지참조] 36
Figure 6. Hydraulic barriers of the pump-and-treat system; (a) Narrow V-shaped hydraulic barrier formed by injection wells installed upstream from the pumping well; (b)... 39
Figure 7. Failure of contaminated groundwater control with pulsed operation (t=12hrs/day). 41
Figure 8. Contaminant removal by the pump-and-treat with various pulsed operation times. 41
Figure 9. Comparison of the contaminated groundwater control performance of various pulsed operation at alternative pumping rates; (a) pumping rates adjustments depending on... 43
Figure 10. Contaminant concentration level comparison of various pump-and-treat operations. 44
Figure 11. Fate and Transport Conceptual Site model 48
Figure 12. Pump-and-treat system at the site. 49
Figure 13. Geological and hydrogeological conditions; (a) three dimensional geological media; (b) hydrogeological boundary conditions and pump-and-treat location in... 51
Figure 14. Numerical simulation of groundwater flow field using MODFLOW. 57
Figure 15. Numerical simulations of TCE plume at 20,000d using MT3DMS; (a) TCE contamination at the research site for Case 1; (b) TCE plume of Case 1; (c) TCE plume of... 59
Figure 16. Expected contaminant pathway simulated with MODPATH for the validation of pump-and-treat location. 60
Figure 17. Numerical simulations of TCE plume at 30,000d using MT3DMS; (a) Case 1; (b) Case 2; (c) Case 3. 61
Figure 18. Numerical simulations of TCE plume at 40,000d using MT3DMS; (a) Case 1; (b) Case 2; (c) Case 3. 62
Figure 19. Monitored contaminated groundwater of the downstream area during 0-40,000 d. 63
Figure 20. Point of exposure (POE) 64