Groundwater Investigation and Associated Source Characterization, June 1996
Table of Contents
Acronyms and Abbreviations
1.4 Investigation Objectives and Scope
2.2 Site Background and History
3.1 Surface Geophysical Surveys
3.1.1 Electromagnetic Induction
3.1.2 Ground Penetrating Radar Survey
3.3 Geophysical Borehole Logging
3.5 Well Installation Methodology
3.5.3 Groundwater Monitoring Wells
3.5.3.1 Drilling of Pilot Holes and Well Boreholes
3.6.1 Plugging of CSSA Inactive Water Wells
3.8 Soil Vapor Extraction Test Procedures
3.9.1 General Sample Handling Procedures
3.9.2 Soil Gas Field Screening
3.9.3 Soil Gas Emission Testing
3.9.5 Groundwater Monitoring and Sampling
3.10 Decontamination Procedures
3.11 Management of Investigation-Derived Waste
3.12.1.2 Target Compounds and Calibration
3.14 Quality Assurance/Quality Control
3.14.2 Soil Gas Quality Control Procedures
Section 4 - Preliminary Assessment
4.2 Water Well Inventory and Surveying
Section 5 - Characterization of Potential Source Areas
5.1 Surface Geophysical Surveys
5.2 Drilling and Sampling of Soil Borings
Section 6 - Oxidation Pond Characterization
6.2 Characterization Activities
6.2.1 Summary of Liner Integrity Investigation
6.3 Identification and Screening of Remedial Alternatives
6.4 Summary and Conclusions of SWMU O-1 Characterization
Section 7 - SWMU B-3 Characterization
7.2 Characterization Activities
7.4 SVE Pilot Test and Characterization Results
7.4.2.1 Volatile Organic Compounds
7.4.2.3 Miscellaneous and Physical Data
7.4.3 Initial Soil Gas Chemistry
7.4.4 Air Permeability Test Results
7.4.5 Subsurface Influence Findings
7.4.5.1 Findings From Air Permeability Test Results
7.4.6 Air Emission/Mass Removal Summary
Section 8 - Hydrogeologic Investigation
8.1.1 Geophysical Well Logging
8.1.2 Discrete Interval Sampling in Perched Zones
8.1.3 Well Upgrades and Plugging
8.2.1 Summary of Quarterly Groundwater Monitoring Events
8.3.2 Ground Penetrating Radar Profiling
8.3.3 Seismic Reflection Survey
8.4 Lower Glen Rose Monitoring Well Installation
8.4.2 Logging of Drill Core and Cuttings
8.4.3 Downhole Geophysical Logging
8.4.4 Monitoring Well Completion
8.4.5 Monitoring Well Development
8.4.6 Monitoring Well Sampling
8.5 Future Waste Water Disposal
8.6 Summary of Hydrogeologic Investigation
Section 9 - Conclusions and Remedial Alternatives
Appendices
Appendix B Pilot Hole Drilling and Downhole Geophysical Logs
Appendix C Monitoring Well Completion and Development Logs
Appendix D Well Plugging Records
Appendix F Technical Memorandum on Soil Gas Surveys
Appendix G Groundwater Monitoring Summary and Associated Actions
Appendix H Waste Characterization Analytical Results and Disposal Manifests
Appendix I Surface Geophysical Anomaly Maps
Appendix J Maps of Chemical Constituent Concentrations at Potential Source Areas
Figures
2.1-1 Installation Location Map
2.4-3 Soils Classification Map
2.4-5 1992 CSSA Well Location Map
2.4-6 Edwards Aquifer RECHARGE Zones near CSSA
3.5-1 Typical Vapor Monitoring Point Construction Detail
3.5-2 Typical Vapor Extraction Well Construction Detail
3.5-3 Deep Well Completion in the Lower Glen Rose
3.8-1 Layout of Installed SVE Pilot Test System, SWMU B-3
3.8-2 Instrumentation Diagram for Installed SVE Blower System, SWMU B-3
3.9-1 Schematic of Soil Gas Sampling Arrangement Using a Tedlar Bag
4 Cross Section B - Bl (Strike Section)
5.1-1 Geophysical Anomaly Summary Map
5.3-1 Soil Gas Survey Location Map
5.3-2 PCE Soil Gas Contour Summary Map (PDF Version)
6.2-1 Anomaly Location Map, SWMU O-1 (Oxidation Pond)
6.2-2 SWMU O-1 Chemical Constituents Greater Than Comparison Concentrations
6.2-4 SWMU O-1 Liner Investigation Location Map
6.4-1 PCE Concentrations Over Time, SWMU O-1 Testing
7.1-1 Anomaly Location Map, SWMU B-3
7.1-2 Chemical Constituents Detected at "Hot Spot" Locations, SWMU B-3
7.1-3 Detailed Distribution of TCE in Soil Gas at SWMU B-3 Using Data Collected in the Fall of 1995
7.1-4 Detailed Distribution of PCE in Soil Gas at SWMU B-3 Using Data Collected in the Fall of 1995
7.3-1 Locations of VEWs and VMPs at SWMU B-3
7.3-2 East-West Cross-Section, SWMU B-3
7.4-1 CSSA SWMU B-3 SVE Air Contaminant Emission Rates
8.2-1 1996 CSSA Well Location Map
8.2-2 Potentiometric Map Without Airline Measurements (May 1994 and September 1994)
8.2-3 Potentiometric Map Without Airline Measurements (5 December 1994 and 12 December 1994)
8.2-4 Potentiometric Map Without Airline Measurements (19 December 1994 and April 1995)
8.2-5 Potentiometric Map Without Airline Measurements (June 1995 and August 1995)
8.2-6 Potentiometric Map Without Airline Measurements (December 1995 and February 1996)
8.2-7 Potentiometric Map Without Airline Measurements (April 1996)
8.2-8 Well 16 HVO Concentrations Over Time
8.2-9 Well D HVO Concentrations Over Time
8.2-10 Water Levels in Well D During the Lower Glen Rose Packer Test
8.2-11 Water Levels in Well D During the Cow Creek Packer Test
8.2-12 Precipitation and Well 16 Water Level Data (September 1995 - March 1996)
8.3-1 Geologic Survey Coverage
8.3-2 Map of GPR Lines and Interpretations
8.3-3 Areas of Bexar Shale Displacement Interpreted from Seismic Reflection Data
8.6-1 Cross-Section A-A' (Dip Section)
8.6-2 Cross-Section B-B' (Strike Section)
Tables
2.3-1 Chronology of Groundwater Investigation
2.4-1 Regional Stratigraphic Units and Their Water-Bearing Properties
4.1-1 Potential Source Areas of Well 16 Contamination
5.1-1 Summary of Geophysical Anomalies Related to Suspected Past Waste Management
5.2-1 Summary of Drilling and Sampling Activities
5.2-2 Potential Source Area Analytes Detected Above Comparison Criteria
5.3-1 Summary of Soil Gas Survey Results
6.2-1 Chemical Constituents Detected in Soil and Groundwater
6.2-2 Analytical Results for O-1 Liner Integrity Test Soil Samples
6.3-1 Preliminary Screening of Remediation Technologies for SWMU O-1 Contaminated Soils
7.1-1 Chemical Constituents of Concern Detected in Soil and Groundwater
7.3-1 Description of Clays of SWMU B-3
7.4-1 Analytical Results for Soil Samples, SWMU B-3
7.4-2 Geotechnical and Physical Property Results of Soil Samples Collected at SWMU B-3
7.4-3 Initial Soil Gas Chemistry, Screening Results, SWMU B-3
7.4-6 Calculated versus Exempted Emission Rates
7.4-7 Analytical Results for IDW Associated with the SVE System, SWMU B-3
8.1-1 Analytical Results of Discrete Interval Sampling Above Static Water, September 1994
8.2-1 April 1996 Well Information
8.2-2 Summary of Groundwater Elevations (updated version)
8.2-3 Groundwater HVO Analytical Results for 1995 & 1996
8.2-4 Groundwater Metals Analytical Results , December 1995, February & March 1996
8.2-5 Groundwater HVO Analytical Results for Offsite Wells
8.2-6 Groundwater Metals Analytical Results for Offsite Wells, December 1995
8.2-7 Analytical Results of Purge Water at Well 16
8.3-1 Geologic Unit Thickness Determined by Geophysical Log Interpretation
8.4-1 VOC and Metal Analytical Data for April 1996
8.4-2 Aqueous Phase Constituents in Well Samples
8.4-3 Analytical Results of MW1 and MW2 Purge Water and Decontamination Water
8.6-1 Published and Observed Thicknesses of Geologic Units
9.1-1 Summary of Remedial Alternatives for SWMU O-1
9.1-2 Summary of Remedial Alternatives for SWMU B-3
9.2-1 Summary of Remedial Alternatives for Groundwater Contamination