LIST OF FIGURES V FIGURE PAGE

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1 LIST OF S V Site Location Map One Mile Radius City Location Map One Mile Radius Land Use Map Typical Design of an Existing Gas Migration Control Well Typical Design of an Existing Drilled Gas Recovery Well Typical Design of an Existing Pile-Driven Gas Recovery Well Typical Design of an Existing Active Trench Typical Design of a Passive Trench Typical Design of an Existing Gas Monitoring Probe Typical Design of an Existing Deep Gas Monitoring Probe Radioactive Material License Packer Permeability Testing Schematic Schematic Diagram of Aquifer Test Equipment Monitoring Well and Lysimeter Design Schematic for Downgradient and Upgradient Hydrogeologic Field Program Monitoring Well Schematic Diagram for the Additional Downgradient Hydrogeologic Field Program Comparison of Upwind Methylene Chloride Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Methylene Chloride Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind Chloroform Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Chloroform Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind 1, 1,1-Trichloroethane Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind 1, 1, 1-Trichloroethane Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind Carbon Tetrachloride Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Carbon Tetrachloride Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind Trichloroethylene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Trichloroethylene Concentrations from the Original and Additional Ambient Air Sampling Programs 3-49 xxv

2 LIST OF S (CONTINUED) # Comparison of Upwind Tetrachloroethylene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Tetrachloroethylene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind Vinyl Chloride Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Vinyl Chloride Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind Benzene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Benzene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind Toluene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Toluene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind Xylenes Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Xylenes Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind Dichlorobenzenes Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Downwind Dichlorobenzenes Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind and Downwind Benzene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind and Downwind Toluene Concentrations from the Original and Additional Ambient Air Sampling Programs Comparison of Upwind and Downwind Xylenes Concentrations from the Original and Additional Ambient Air Sampling Programs Methane Concentration Versus Time for Surface Gas Monitoring TOC As Methane Versus Time for Boundary Probe BS TOC As Methane Versus Time for Boundary Probe BC TOC As Methane Versus Time for Boundary Probe MN TOC As Methane Versus Time for Boundary Probe MN TOC As Methane Versus Time for Boundary Probe MN TOC As Methane Versus Time for Boundary Probe MN TOC As Methane Versus Time for Boundary Probe MN TOC As Methane Versus Time for Boundary Probe MN TOC As Methane Versus Time for Boundary Probe MC xxvi m

3 LIST OF S (CONTINUED) TOC As Methane Versus Time for Boundary Probe MC TOC As Methane Versus Time for Boundary Probe MC TOC As Methane Versus Time for Boundary Probe MC TOC As Methane Versus Time for Boundary Probe MC Location of Major PVLF Storm Drains and the Subsurface Barrier Typical Views of Hawthorne Boulevard Storm Drain System and Subsurface Barrier South Coast Botanic Garden Lake and Stream Channel Regional Geologic Setting Regional Geologic Cross Section Geologic Data Points Within the Study Area Geologic Data Points Within the Study Area (Enlarged Area) Index Map to Site Geologic Cross Sections Legend for Geologic Cross Sections A Geologic Cross Section A-A' B Geologic Cross Section B-B' C Geologic Cross Section C-C D Geologic Cross Section D-D' E Geologic Cross Section E-E' F Geologic Cross Section F-F G Geologic Cross Section G-G' H Geologic Cross Section H-H' Geologic Cross Section I-I' J Geologic Cross Section J-J' K Geologic Cross Section K-K' L Geologic Cross Section L-L' M Geologic Cross Section M-M' N Geologic Cross Section N-N' O Geologic Cross Section O-O' P Geologic Cross Section P-P' Q Geologic Cross Section Q-Q' R Geologic Cross Section R-R' West Coast Basin Aquifer System Cross Sections Through West Coast Basin Problem Definition - Test Case Plan View of Model Grid Vertical Model Grid - Slice Model Area Recharge Zones Ground Water Elevations for the Calibrated Model xxvii

4 LIST OF S (CONTINUED) Distribution of Horizontal Velocities and Contours of Ground Water Elevations (Top Layer, Calibrated Model) Ground Water Elevations and Particle Pathways for the Calibrated Model - 2,000 Years Travel Time Summary Statistics from Sensitivity/Uncertainty Analysis Scatter Diagram of Particle Pathways Years Travel Time Scatter Diagram of Particle Pathways - 2,000 Years Travel Time Ground Water Elevations and Particle Paths Between the PVLF and the Model Boundary (Calibrated Model) Envelope of Particle Paths Between the PVLF and the Model Boundary Particle Pathways Between the PVLF and Model Boundary and Contours of Ground Water Heads (Slice 14, Calibrated Model) Index Map to Geologic Cross Sections With Chemical Data Legend for Geologic Cross Sections With Chemical Data a Geologic Cross Section a-a' With Chemical Data b Geologic Cross Section b-b' With Chemical Data c Geologic Cross Section c-c' With Chemical Data d Geologic Cross Section d-d' With Chemical Data e. Geologic Cross Section e-e' With Chemical Data f Geologic Cross Section f-f With Chemical Data g Geologic Cross Section g-g' With Chemical Data h Geologic Cross Section h-h' With Chemical Data i Geologic Cross Section i-i' With Chemical Data J Geologic Cross Section j-j' With Chemical Data k Geologic Cross Section k-k' With Chemical Data Geologic Cross Section 1-1' With Chemical Data m Geologic Cross Section m-m' With Chemical Data n Geologic Cross Section n-n' With Chemical Data o Geologic Cross Section o-o' With Chemical Data p Geologic Cross Section p-p' With Chemical Data q Geologic Cross Section q-q' With Chemical Data r Geologic Cross Section r-r' With Chemical Data s Geologic Cross Section s-s' With Chemical Data t Geologic Cross Section t-t' With Chemical Data Comparison Between MT3D and Analytical Solution, Linear Scale Comparison Between MT3D and Analytical Solution, Semi-Logarithmic Scale Distribution of Potential Sources Used in the Model Locations of Potential Ground Water Receptors 5-37 xxviii

5 LIST OF S (CONTINUED) Predicted Breakthrough Curves of Nitrate Concentration at Potential Receptors, Layer Predicted Breakthrough Curves of Nitrate Concentration at Potential Receptors, Layer Predicted Breakthrough Curves of Nitrate Concentration at Potential Receptors, Layer Predicted Breakthrough Curves of Vinyl Chloride Concentration at Potential Receptors, Layer Predicted Breakthrough Curves of Vinyl Chloride Concentration at Potential Receptors, Layer Predicted Breakthrough Curves of Vinyl Chloride Concentration at Potential Receptors, Layer Scatter Diagram of Maximum Concentrations of Vinyl Chloride From Sensitivity Analysis Cases at Receptor 2, Layer Scatter Diagram of Maximum Concentrations of Vinyl Chloride From Sensitivity Analysis Cases at Receptor 5, Layer Drinking Water Wells Near the PVLF Air Dispersion Modeling Receptor Grid 6-68 # xxix

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