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Final September 2002 On-Post Quarterly Groundwater Monitoring Report, December 2002

Table of Contents

Groundwater monitoring scoped under the Air Force Center for Environmental Excellence (AFCEE) 3P/AE Contract 41624-00-D-8024, Task Order (TO) 0042, was performed the week of September 9, 2002, at Camp Stanley Storage Activity (CSSA). On-post groundwater monitoring conducted under this TO began at the March 2002 sampling event and will continue through the March 2003 sampling event. Groundwater monitoring conducted prior to March 2002 was conducted under Delivery Order (DO) 67, 23, RL74, DO5084, and RL83. AFCEE/Environmental Restoration Directorate (ERD) and AFCEE/Environmental Restoration Consultant (ERC) provide technical oversight of the monitoring program.

The current objectives of the groundwater-monitoring program are to determine groundwater flow direction and elevations, determine groundwater contaminant concentrations for characterization purposes, and identify seasonal variations in physical and chemical properties. Appendix A identifies the data quality objectives (DQOs) for CSSA�s groundwater monitoring program, along with an evaluation of whether each DQO has been attained. The objectives listed in the table also reference appropriate sections of the 3008(h) Administrative Order on Consent (Order). Overall DQOs for the investigations at CSSA are provided in Volume 1-1 behind the RFI Addendum tab (Section 11).

1.0 - Water Level Measurements

2.0 - Basewide Flow Direction and Gradient

3.0 - Well CS-MW16-LGR Water Level and Transducer Data

4.0 - September 2002 Analytical Results

4.1   Volatile Organic Compound Analyses

4.2   Metals Analyses

4.3   Natural Attenuation Parameters

4.3.1   Conditions of Natural Attenuation

4.3.2   Natural Attenuation Parameter Results

5.0 - Summary

6.0 - References

Appendices

Appendix A - Evaluation of Data Quality Objectives Attainment

Appendix B - September 2002 Quarterly On-Post Groundwater Monitoring Analytical Results

Appendix C-1 - Results of Natural Attenuation Study

Appendix C-2 - Results of Natural Attenuation Study

Tables

Table 1-1 - CSSA Summary of Groundwater Elevations, September 2002

Table 1-2 - Comparison of Groundwater Elevations from June 2002 to September 2002

Table 3-1 - Comparison of CS-MW16-LGR Weather Station Precipitation and Average Overall Groundwater Elevation Change

Table 4-1 - September 2002 Quarterly Groundwater Detected Concentrations

Table 4-2 - Groundwater Natural Attenuation Parameters

Figures

Figure 2-1 - September 2002 Potentiometric Surface Map

Figure 2-2 - September 2002 Potentiometric Surface Map for the LGR Screened Wells Near Building 90

Figure 2-3 - September 2002 Potentiometric Surface Map for the CC Screened Wells near Building 90

Figure 2-4 - Groundwater Elevations for Wells CS-MW6-LGR/BS/CC

Figure 2-5 - Groundwater Elevations for Wells CS-MW7-LGR/CC

Figure 2-6 - Groundwater Elevations for Wells CS-MW8-LGR/CC

Figure 2-7 - Groundwater Elevations for Wells CS-MW10-LGR/CC

Figure 2-8 - Comparison of AOC 65 Potentiometric Surface Maps from July to September 2002

Figure 3-1 - Well CS-MW16-LGR GW Elevation and Precipitation Data

Figure 3-2 - Wells CS-MW16-LGR and CS-MW4-LGR Groundwater Elevation and Precipitation Data, September 2002

Figure 3-3 - Well CS-MW9 Cluster Groundwater Elevation and Precipitation Data

Figure 4-1 - Well CS-MW16-LGR PCE and TCE Concentrations since 1991

Figure 4-2 - Well CS-MW16-LGR Concentrations for Selected Analytes since 1998

Figure 4-3 - Well CS-D PCE and TCE Concentrations since 1991

Figure 4-4 - Well CS-D Concentrations for Selected Analytes since 2000

Figure 4-5 - Well CS-MW1-LGR PCE and TCE Concentrations since 1998

Figure 4-6 - Well CS-MW2-LGR PCE and TCE Concentrations since 1998

Figure 5-1 - Concentrations of Tetrachloroethene in Selected Wells

Figure 5-2 - Concentrations of Trichloroethene in Selected Wells

Figure 5-3 - Concentrations of cis-1,2-Dichloroethene in Selected Wells