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Mr. Brattain October 19, 2020 Page 7 • A reduction in the analyte list is being proposed for monitoring wells MW-205B, MW- 214B and MW-215B where permanganate monitoring does not provide value due to limited injections into the B-zone groundwater. • GWMP monitoring wells MW-002A, MW-003A, MW-115A and MW-210B are being proposed to be excluded completely from the monitoring network instead of remaining on the current annual frequency. These wells historically exhibit very low to non-detect COC concentrations, do not fall within the plume footprint and therefore qualify for exclusion from current monitoring under the Tier 1 criteria. • GWMP wells MW-001A, MW-005A, MW-103A, MW-104A, MW-105A, MW-110A, MW-11IA,MW-203B-1,MW-203B-3, and MW-204B that are no longer being monitored for COCs are being proposed for destruction because these wells are not required for evaluating the remedial performance at the Site. Next Steps As discussed during the 15 October 2020 teleconference and described above, our understanding is that the CVRWQCB is going to evaluate the option of rescinding the current WDR-MRP to facilitate modification of the monitoring plan consistent with the progress of the Final Remedy at the Site and to allow implementation of contingency actions if necessary. If this is acceptable to the CVRWQCB,we would propose rescinding the current WDR-MRP as soon as possible so that the proposed monitoring modifications can be implemented under the GWMP. The Trust would then work with the CVRWQCB to develop the new WDR-MRP with the intent of having the new WDR-MRP approved and in effect within the next six months. Closing The Trust is in favor of rescinding the current WDR-MRP and issuing a new WDR-MRP more consistent with the current status of the remediation at the Site as proposed by the CVRWQCB. We look forward to discussing this with you further. Please let us know if there is anything the Trust or Geosyntec can do to facilitate this process and we appreciate you working with us to resolve this issue. engineers I scientists I innovators