Agenda - Council - 10/22/1985 - Laserfiche WebLink

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~r. Daniel ~. Comeau September 25, I9~I5 Pag(' lhree pages lo-14. A Remedial Investigation generally consists of submission of an Evaluation Report before extensive field activity is conducted. The results of the field investigation are then compiled and discussed in a Remedial Investigation Final Report. The WMMI/Anoka Sanitary Landfill Remedial Investigation is unusual because WMMI voluntarily accelerated the initial field program before the Evaluation Report was submitted to meet requirements of Anoka County and its own desire to begin immediate investigation of the situation. WMMI has already submitted drilling logs, location maps, water quality data, and water level data to the MPCA for timely review and discussion. Submitted data is recognized to be partial and preliminary in light of the full anticipated field investigation program. Extensive conclusions cannot be reliably derived from the data obtained at this time. A telephone conversation was held on June 24, 1985 between Dan Comeau, Bruce Nelson, and Larry Johnson, with the following specific questions raised: "Is it necessary to submit interpretational data (e.g., geological cross-sections) in the Evaluation Report? Why not wait until the Final Report." Later the same day, we were notified that it was permissible to wait with interpretational data, such as geological cross-sections, and not include such information in the Evaluation Report. Based on this understanding, detailed discussions of "the hydrology, stratigraphy, and geology" were not included in the Evaluation Report. Throughout the current Remedial Investigation, an on-going internal review and analysis of available data is taking place which is consistent with the phased approach to the investigation as described in Appendix A to the Consent Order (pp. 8-9). The data is being reviewed to better evaluate hydrogeological conditions, to plan subsequent sampl)ng activities, and to assess the need for WMMI to propose modifications to the program or additional phases of investigation as contemplated in Appendix A, if necessary to determine the nature and extent of real or potential releases. It is understood, based on your letter, that MPCA staff desires access to any documents prepared by WMMI as part of this evaluation process prior to WMMI's proposal of new phases, if any are needed. WMMI understood the Consent Order to call for completion of the investigation in phases with proposals by WMMI at the conclusion of each phase for additional work needed, if any, in Work Plan Addenda. Updated geological cross-sections will be prepared following installation of four additional groundwater monitoring wells which were recently approved by MPCA. Copies of the information will be provided to MPCA, along with the drilling logs for the new wells. Water level and water quality data will continue to be suppl~ed to MPCA as it becomes available.