[Home]
[B-20/21
Table of Contents]
Remedial Investigation Report
for
B-20 Former Open Burn/Open Detonation Area -
June 1995
Table of Contents
Acronyms
and Abbreviations
Section
1 - Introduction
1.1 Purpose of Report
1.2 Regulatory Basis
1.3 Project Authorization
1.4 Investigation Objectives and Scope
1.5 Report Organization
Section
2 - Site History and Background
2.1 Installation Description and History
2.1.1 Location and Setting
2.1.2 History
2.2 B-20 Unit Description
2.2.1 History of Operations
2.2.2 Inventory of Wastes
2.3 Environmental Setting
2.3.1 Climate
2.3.2 Topography
2.3.3 Drainage and Surface Water
2.3.4 Soils
2.3.4.1 Brackett-Tarrant Association
2.3.4.2 Crawford and Bexar Stony Soils
2.3.4.3 Krum Complex
2.3.5 Geology
2.3.5.1 Stratigraphy
2.3.5.2 Structure
2.3.6 Hydrogeology
2.4 Summary of Prior Investigation Results
Section 3 - Regulatory Framework
3.1 Background
3.2 Closure Performance Standard
3.3 Applicable State Regulations
3.4 Closure Status
Section
4 - Methodology
4.1 Unexploded Ordnance Screening
4.2 Magnetometer Survey
4.3 Subsurface Activities
4.3.1 Drilling
4.3.2 Soil Sampling
4.3.3 Groundwater Sampling
4.4 Surface Soil Sampling
4.4.1 Judgmental Surface Soil Sampling
4.4.2 Systematic Surface Soil Sampling
4.5 Surface Water Sampling
4.6 Sediment Sampling
4.7 Background Sampling
4.8 Sample Handling Procedures
4.8.1 Sample Identification
4.8.2 Sample Handling Protocol
4.9 Decontamination Procedures
4.10 Surveying
4.11 Management of Investigation-Derived Waste
4.12 Laboratory Analysis
4.12.1 Chemical
4.12.1.1 Judgmental Surface Soil Samples
4.12.1.2 Systematic Surface Soil Samples
4.12.1.3 Subsurface Soil Samples
4.12.1.4 Sediment Samples
4.12.1.5 Groundwater
4.12.1.6 Background Surface Soil Samples
4.12.1.7 Surface Water
4.12.2 Geotechnical
4.13 Quality Assurance/Quality Control
4.14 Data Validation
4.14.1 Deliverables
4.14.2 Holding Times
4.14.3 Instrument Performance Check
4.14.4 Calibrations
4.14.5 Blanks
4.14.6 Surrogate Spikes
4.14.7 Matrix Spike Sample Recovery
4.14.8 Laboratory Control Samples
4.14.9 Internal Standards
4.14.10 Duplicate Sample Recovery
4.14.11 AA Post-Digestion Spike Recovery
4.14.12 Field Duplicate Samples
4.15 Statistical evaluation of Background Metals Concentrations
4.15.1 Background Sample Set
4.15.2 Statistical Approach
4.15.3 Procedures for Non-Detects
4.15.4 Normality Tests
4.15.4.1 Probability Plots
4.15.4.2 Shapiro Wilk Test
4.15.4.3 Probability Plot Correlation Coefficient
4.15.5 Adjustment of sample Mean and Standard Deviation
4.15.5.1 Censored Probability Plot
4.15.5.2 Detects Only Probability Plot
4.15.5.3 Cohen's Adjustment
4.15.5.4 Aitchinson's Adjustment
4.15.6 Upper Tolerance Limit
Section
5 - Remedial Investigation Results
5.1 Site Prescreening
5.2 Magnetometer Survey
5.3 Background Sample Analytical Results and Statistical Evaluation
5.3.1 Arsenic
5.3.2 Barium
5.3.3 Cadmium
5.3.4 Chromium
5.3.5 Lead
5.3.6 Mercury
5.4 Site Observations
5.4.1 Soils
5.4.2 Geology
5.4.3 Hydrogeology
5.4.4 Surface Water
5.5 Environmental Sample Analytical Results
5.5.1 Subsurface Soil
5.5.1.1 Analytical Results
5.5.1.2 Comparison to Standard 1 Criteria
5.5.1.3 Comparison to Standard 2 Criteria
5.5.2 Surface Soil
5.5.2.1 Analytical Results
5.5.2.2 Comparison to Standard 1 Criteria
5.5.2.3 Comparison to Standard 2 Criteria
5.5.3 Surface Water
5.5.3.1 Analytical Results
5.5.3.2 Comparison to Standard 1 Criteria
5.5.3.3 Comparison to Standard 2 Criteria
5.5.4 Sediment
5.5.4.1 Analytical Results
5.5.4.2 Comparison to Standard 1 Criteria
5.5.4.3 Comparison to Standard 2 Criteria
5.5.5 Groundwater
5.5.5.1 Analytical Results
5.5.5.2 Comparison to Standard 1 Criteria
5.5.5.3 Comparison to Standard 2 Criteria
5.6 Geotechnical Sampling
Section
6 - Conclusions
6.1 Surface Soils
6.1.1 Unexploded Ordnance
6.1.2 Chemical Contamination
6.2 Subsurface Soils
6.2.1 Unexploded Ordnance
6.2.2 Chemical Contamination
6.3 Surface Water
Section
7 - Closure Options and Recommendations
7.1 Standard 1
7.1.1 Requirements
7.1.2 Recommendations
7.1.2.1 Surface Soil
7.1.2.2 Subsurface Soil
7.1.2.3 Sediment
7.1.2.4 Surface Water
7.2 Standard 2
7.2.1 Requirements
7.2.2 Recommendations
7.2.2.1 Surface Soil
7.2.2.2 Subsurface Soil
7.2.2.3 Surface Water
7.3 Standard 3
7.3.1 Requirements
7.3.2 Recommendations
7.3.2.1 Surface Soil
7.3.2.2 Subsurface Soil
7.3.2.3 Surface Water
7.3.2.4 Other Requirements
7.4 Combination of Standards
7.4.1 Requirements
7.4.2 Recommendations
7.4.2.1 Surface Soil
7.4.2.2 Subsurface Soil
7.4.2.3 Other Requirements
Section
8 - References
Appendices
Appendix
A Delivery Order 126 SOW
Appendix
B Photographs of B-20 Site and Investigative Procedures
Appendix
C Summary of Previous Analytical Results
Appendix
D Correspondence Regarding B-20 Site
Appendix
E Soil Boring Logs
Appendix
F Data Validation Report
Appendix
G Geotechnical Data
Appendix
H Statistical Calculations