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[Groundwater Table of Contents]

Final March 2003 On-Post Quarterly Groundwater Monitoring Report, August 2003

Table of Contents

1.0 - Water Level Measurements

2.0 - Basewide Flow Direction and Gradient

3.0� - Meteorological Station and Transducer Data

4.0 - March 2003 Analytical Results

4.1   Volatile Organic Compound Results

4.1.1   Toluene and Methylene Chloride Detections

4.1.2   MCL Exceedances in Monitoring Wells

4.1.3   Detections below the MCL in Monitoring Wells

4.1.4   Drinking Water Supply Well Results

4.2   Metals Analyses

5.0 - Summary

Appendices

Appendix A   Evaluation of Data Quality Objectives Attainment

Appendix B   March 2003 Quarterly On-Post Groundwater Monitoring Analytical Results

Tables

Table 1-1   Summary of Groundwater Elevations

Table 1-2   Comparison of Groundwater Elevations from� December 2002 to April 2003

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

Table 4-1   March 2003 Quarterly Groundwater Detected Concentrations

Figure 2-1   April 2003 Potentiometric Surface Map

Figure 2-2   April 2003 Potentiometric Surface Map for the LGR Screened Wells Near Building 90

Figure 2-3   April 2003 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 3-1   Well CS-MW16-LGR GW Elevation and Precipitation Data

Figure 3-2   Well CS-MW9 Cluster Groundwater Elevation and Precipitation Data

Figure 3-3   Wells CS-MW16-LGR and CS-MW4-LGR Groundwater Elevation and Precipitation Data, March 2003

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