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TO: Mr. Bruce Woody <br />Orange County Solid Waste Management <br />FROM: Deborah Coakley, Sean Jarvah, Bilgen Yuncu <br />Environmental Services Division <br />DATE: 06/03/25 <br />SUBJECT: Groundwater Monitoring Program (FY 2025-2026) <br />OCSWM South Landfill: <br />TRC Project No. TBD <br />TRC Engineers, Inc., (formerly Draper Aden Associates) proposes to provide professional environmental <br />services to Orange County Solid Waste Management (OCSWM) pertaining to the groundwater monitoring <br />and corrective action program at the South Landfill, in accordance with an existing Services Agreement <br />between OCSWM and TRC. <br />The subject proposal is intended to encompass services that will be provided to conduct the Fall 2025 and <br />Spring 2024 groundwater sampling/reporting events (July 1, 2025 through June 30, 2026). <br />This proposal is restricted to services to be provided for the South Landfill. Specific tasks to be performed <br />during the service period are detailed as follows. <br />Task-01 <br />Groundwater Sampling Event 63 (Event 2025 S2) <br />TRC proposes to conduct groundwater sampling event 63 at the Orange County Regional Landfill - South <br />Landfill during November 2025. <br />TRC shall coordinate field and laboratory services, obtain groundwater samples, review sampling <br />documentation received from groundwater sampling personnel, chemically analyze groundwater samples <br />(Eurofins), validate analytical data provided by the contracted laboratory, update historical summary tables, <br />and prepare a report suitable for direct submission to NCDEQ. <br />During the subject sampling event, the laboratory will analyze: <br />▪samples obtained from seven compliance wells (6801-MW101, 6801-MW102S, 6801-MW104, <br />6801-MW106, 6801-MW107, 6801-MW110S, 6801-MW111) for the constituents listed in <br />Appendix I <br />▪samples obtained from one compliance well (6801-MW105) for the constituents listed in <br />Appendix II <br />▪additional samples obtained from well 6801-MW110S for constituents required by regulations <br />for monitoring of C&D landfills (manganese, iron, mercury, chloride, sulfate, tetrahydrofuran, <br />total dissolved solids, alkalinity) (well 6801-MW110S is associated with the monitoring programs <br />Docusign Envelope ID: E79879EB-31A0-44EB-B1E0-900452922197