SITE INFORMATION AND CORRESPONDENCE_1997

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Lincoln Center - 3 - Proposed Phase I Interim Remedial Action Detailed Plan (31 October 1997) 1. The plan is well documented and very detailed. The SDCDs propose to install 17 groundwater extraction wells and 34 piezometers in a line parallel to Pacific Avenue. Groundwater will be extracted and treated by air stripping followed by liquid-phase granular activated carbon. Treated groundwater will be discharged to the storm drain under an NPDES permit. The plan is hereby approved. 2. LFR states that well MW-102 will not be added to the quarterly monitoring program. This sort of decision may only be made in consultation with staff. Unless discussed further, well MW-102 is to be included in the quarterly monitoring events. 3. As stated above, all detected chemicals are to be tabulated. -.0ft. 4. The NPDES permit will contain effluent limits for the petroleum chemicals which have been detected at the Chevron Station, Exxon Station, and possibly the Mobil Station. 5. The text contains information collected through September 1997, and field work continues to define the entire extent of the groundwater plume. 6. Staff are not commenting at this time regarding the applicability of the Applicable or Relevant and Appropriate Requirements (ARARs)which are listed in Appendix G. 7. The implementation schedule shows that the groundwater treatment system will be fully operational 34 weeks (8.5 months) after the IRA Detailed Plan is approved. Please keep us informed of the progress of system installation through the bimonthly letters and the progress meetings. Revised Remedial Investigation Schedule (5 November 1997 conference call) 1. We wish to be involved in all "meet and confer"meetings listed on the schedule. We understand that the meetings listed in the schedule are merely included as placeholders and that the meetings occur as needed. 2. The RI Source Investigation reportwill be submitted in January 1998. The Sequence 5 soil borings and Sequence 6 well installation activities will now be conducted as part of the Phase II IRA instead of the RI Source Investigation. 3. The proposed locations for the Sequence 5 soil borings and Sequence 6 well installations will be presented to staff in the Phase II IRA workplan. 4. Additional field work, beyond that described in the September 1996 Work Plan for Environmental Investigation,will be conducted as part of the Plume Perimeter Investigation. Proposed locations for well installation and CPT locations shall be submitted to staff in January 1998. 5. We agreed that LFR may collect an in-situ groundwater sample from the C zone upgradient of MW- 30 in lieu of placing an additional monitoring well in this location.