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Final March 2004 On-Post Quarterly Groundwater Monitoring Report, August 2004

Table of Contents

1.0 - Water Level Measurements

2.0 - Basewide Flow Direction and Gradient

3.0 - Weather Station and Transducer Data

4.0 - Westbay^�-Equipped Well Results

4.1   PCE and TCE Results

4.2   Other Results

4.3   Profile Measurements

5.0 - March 2004 Analytical Results

5.1   Volatile Organic Compound Results

5.1.1   Toluene and Methylene Chloride Detections

5.1.2   MCL Exceedances in Monitoring Wells

5.1.3   Detections Below the MCL in Monitoring Wells

5.1.4   Drinking Water Supply Well Results

5.2   Metals Analyses

6.0 - Summary

Appendices

Appendix A   Evaluation of Data Quality Objectives Attainment

Appendix B   March 2004 Quarterly On-Post Groundwater Monitoring Analytical Results

Tables

Table 1-1   Summary of Groundwater Elevations

Table 1-2   Comparison of Groundwater Elevations from December 2003 to March 2004

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

Table 4-1   Combined Results from Westbay-Equipped Wells

Table 5-1   March 2004 Quarterly Groundwater Detected Concentrations

Table 6-1   Summary of Detections for March 2004 compared to December 2003

Figures

Figure 2-1   March 2004 Potentiometric Surface Map, LGR Wells Only

Figure 2-2   March 2004 Potentiometric Surface Map, BS Wells Only

Figure 2-3   March 2004 Potentiometric Surface Map, CC Wells Only

Figure 2-4   March 2004 Potentiometric Surface Map for the LGR Screened Wells Near Building 90

Figure 2-5   March 2004 Potentiometric Surface Map for the CC Screened Wells Near Building 90

Figure 2-6   Groundwater Elevations and Precipitation for Well Clusters CS-MW6, CS-MW7, CS-MW8, and CS-MW10

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

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

Figure 3-3   Well CS-MW16-LGR and CS-MW4-LGR Groundwater Elevation and Precipitation Data Through March 17

Figure 4-1   CS-WB01 Combined Concentration, Water Level and Rainfall Data

Figure 4-2   CW-WB02 Combined Concentration, Water Level, and Rainfall Data

Figure 4-3   CS-WB03 Combined Concentration, Water Level, and Rainfall Data

Figure 4-4   CS-WB04 Combined Concentration, Water Level and Rainfall Data

Figure 4-5   Westbay^� Potential Head Measurements by Depth

Figure 5-1   Concentrations of Selected Analytes Since 1991

Figure 5-2   Concentrations of Selected Analytes Since 1998

Figure 6-1   Concentrations of Tetrachloroethene in Selected Wells

Figure 6-2   Concentrations of Trichloroethene in Selected Wells

Figure 6-3   Concentrations of cis-1,2-Dichloroethene in Selected Wells