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• Statistical analysis of groundwater levels at the Stegner and LaFarge monitoring wells <br />indicates that statistically significant groundwater level increases have occurred at wells <br />' S-2, S-3, and S-4 and a statistically significant groundwater level decrease has occurred <br />at well S-5 since the slurry wall was installed. None of the other wells analyzed (S-1, S-6, <br />' S-7, S-8, L-1, L-2, L-3, and L-5) exhibited a statistically significant increase or decrease <br />since the slurry wall was installed. Therefore, for the monitoring wells analyzed, the most <br />' significant groundwater level changes are only observed immediately adjacent to the <br />slurry wall at wells S-2, S-3, S-4, and S-5 as expected. <br />• Considering that the groundwater level changes observed either upgradient or <br />downgradient have not violated the permit conditions to date, no mitigation is warranted <br />at this time. <br />ii <br />