2007-11-20_REVISION - M1982015 (12)

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D. Remediation system design diagrams showing how the system will be constructed in the field. The extent of need for active remediation has not been determined yet. If an active system is necessary after gross removal of impacted soil, a system design will be promptly developed and submitted to CDPHE as an addendum to this report. E. A remediation system operation and maintenance plan that describes, at a minimum, how the system will be operated to ensure that it functions as designed without interruptions and a sampling program that will be used to monitor its effectiveness in achieving the desired goal. The need for active remediation has not been determined yet. If an active system is necessary after gross removal of impacted soil, a system operations & maintenance plan will be developed and submitted to CDPHE as an addendum to this report. F. The plan should describe the sampling program that will be used to verify that treatment of the contaminated media has resulted in attainment of the proposed cleanup goals. During the gross soil excavation, one soil sample will be collected for each 100 cubic yards of material removed for off-site disposal. Once the excavation activities have removed soils with gasoline impacts, confirmation soil samples will be collected from the sidewall and bottom of the excavations at approximately 50 foot intervals. The proposed confirmation soil sample locations are shown on Figure 6. After completion of the slurry wall, new groundwater monitoring wells will be installed in areas to better characterize groundwater conditions. The new well locations are shown on Figure 7. It is expected that after soil excavation activities are complete, residual groundwater impacts will be remediated. As discussed above, a groundwater remediation plan will be developed and a plan for confirmation for cleanup of groundwater will be submitted to CDPHE with the groundwater remediation plan as an addendum to this report. 23