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March 2003 Off-Post Quarterly Groundwater Monitoring Report
Appendix C - Pre- and Post-GAC Sample Comparisons
Wells LS-6, LS-7, RFR-10, RFR-11, LS-2/LS-3 and OFR-3
| LS-2/LS-3 | LS-6 | |||||||||
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| PCE (�g/L) | TCE (�g/L) |
| PCE (�g/L) | TCE (�g/L) | |||||
| Date | Pre | Post | Pre | Post | Date | Pre | Post | Pre | Post | |
| 03/18/02 | 2.9/1.3 | NA | 0.29/0.63 | NA | 08/15/01 | GAC UNIT INSTALLED | ||||
| 04/2002 | GAC UNIT INSTALLED | 08/30/01 | 5.7 | ND | 0.57 | ND | ||||
| 04/11/02 | 0.82/1.53 | ND | ND/ND | ND | 09/19/01 | 6.7 | ND | 0.35 | ND | |
| 06/12/02 | 2.22/1.06 | NA | 0.31/0.20 | NA | 09/27/01 | 20.0 | NA | 0.38 | NA | |
| 09/17/02 | 2.62/2.9 | ND | 0.17/0.21 | ND | 12/18/01 | 1.97 | ND | ND | ND | |
| 03/12/03 | 4.25/3.99 | ND | 0.30/0.35 | ND | 03/18/02 | 2.7 | ND | 0.2 | ND | |
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| 09/16/02 | 1.58 | ND | 0.1 | ND | |
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| 03/12/03 | 4.19 | ND | 0.21 | ND | |
| LS-7 | OFR-3 | |||||||||
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| PCE (�g/L) | TCE (�g/L) |
| PCE (�g/L) | TCE (�g/L) | |||||
| Date | Pre | Post | Pre | Post | Date | Pre | Post | Pre | Post | |
| 08/07/01 | GAC UNIT INSTALLED | 03/19/02 | 12.15 | NA | 5.65 | NA | ||||
| 08/08/01 | NA | ND | NA | ND | 04/16/02 | 9.38 | NA | 3.77 | NA | |
| 08/30/01 | 1.1 | NA | ND | NA | 4/30/02 | GAC UNIT INSTALLED | ||||
| 09/19/01 | 4.5 | ND | 0.81 | ND | 04/30/02 | NA | ND | NA | ND | |
| 09/27/01 | 6.6 | NA | 0.68 | NA | 06/11/02 | 10.22 | NA | 6.24 | NA | |
| 12/18/01 | 1.4 | ND | ND | ND | 09/16/02 | 2.96 | ND | 2.59 | ND | |
| 03/18/02 | 2.7 | ND | 0.24 | ND | 03/12/03 | 2.81 | ND | 3.25 | ND | |
| 09/16/02 | 2.41 | ND | 0.34 | ND |
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| 03/12/03 | 4.01 | ND | 0.41 | ND |
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| RFR-10 | RFR-11 | ||||||||
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| PCE (�g/L) | TCE (�g/L) |
| PCE (�g/L) | TCE (�g/L) | ||||
| Date | Pre | Post | Pre | Post | Date | Pre | Post | Pre | Post |
| 10/09/01 | GAC UNIT INSTALLED | 10/04/01 | 16.0 | NA | 0.35 | NA | |||
| 10/12/01 | 20.89 | ND | 8.21 | ND | 10/12/01 | 16.73 | NA | 0.58 | NA |
| 12/17/01 | 9.02 | ND | 5.85 | ND | 10/16/01 | GAC UNIT INSTALLED | |||
| 03/18/02 | 4.5 | ND | 2.2 | ND | 10/25/01 | NA | ND | NA | ND |
| 09/16/02 | 9.19 | ND | 4.84 | ND | 12/17/01 | 12.44 | ND | ND | ND |
| 03/12/03 | 13.88 | ND | 8.37 | ND | 03/19/02 | 5.71 | ND | 1.05 | ND |
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| 09/16/02 | 8.44 | ND | 0.67 | ND |
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| 03/12/03 | 10.02 | 0.07F | 0.12 | ND |
| NA � not applicable (post-GAC not sampled during this event) ND � indicates analyte was not detected at or above the MDL. | |||||||||