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Final June 2004 On-Post Quarterly Groundwater Monitoring Report, October 2004

Table of Contents

Groundwater monitoring scoped under the Air Force Center for Environmental Excellence (AFCEE) 4P/AE Contract 41624-03-D-8613, Task Order (TO) 0008, was performed during the week of June 14, 2004, at Camp Stanley Storage Activity (CSSA). On-Post groundwater monitoring conducted under this TO began with the September 2003 sampling event. Groundwater monitoring conducted prior to September 2003 was conducted under various delivery orders as shown in Table 1 of the Introduction to the Groundwater Monitoring Program, Volume 5. AFCEE provides technical oversight of the monitoring program.

Current objectives of the groundwater monitoring program are to determine groundwater flow direction and elevations, determine groundwater contaminant concentrations for characterization purposes, and identify meteorological and seasonal variations in physical and chemical properties. Appendix A identifies the data quality objectives (DQO) for CSSA�s groundwater monitoring program, along with an evaluation of whether each DQO was 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 - Weather Station and Transducer Data

4.0 - Westbay�-Equipped Well Results

4.1   PCE and TCE Results

4.2   cis-1,2-DCE Results

4.3   Other Results

4.4   Profile Measurements

5.0 - June 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

6.0 - Summary

Appendices

Appendix A   Evaluation of Data Quality Objectives Attainment

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

Appendix C   In-Situ Low Flow Logs

Appendix D   On-post Cumulative Analytical Results

Tables

Table 1-1   Summary of Groundwater Elevations, June 2004

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

Table 3-1   Comparison of Northern and Southern Weather Station Precipitation and Average Overall Groundwater Elevation Change

Table 5-1   June 2004 Quarterly Groundwater Detected Concentrations

Figures

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

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

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

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

Figure 2-5   June 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 4-1   CS-WB01 Combined Concentration, Water Level and Rainfall Data

Figure 4-2   CS-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   CS-WB01 Combined Hourly Groundwater Elevation and 30-minute Rainfall Data

Figure 5-1   Concentrations of Selected Analytes Since 1998