2026-078-E-Solid Waste-TRCcompanies-Orange County Regional Landfills Closed MSW Landfill Leachate PFAS Study

Browse Search

Mr. Robert Williams February 19, 2026 – Landfill Leachate PFAS Study – Phase 2 Revised Page 2 of 5 and performance expectations. The test findings and cost estimates will be communicated only to OCSW officials and not made public, except at OCSW’s behest. Meanwhile, TRC will continue to monitor the regulations (at no cost to OCSW) and continue our participation in coordination meetings with OWASA. SCOPE OF SERVICES Task 1 – Large Sample Acquisition: TRC will coordinate with OCSW and ECT2 on sample procurement. Depending on the requirements, TRC is setting aside budget to oversee or physically procure the sampling with ECT2’s oversight. The samples will likely require one or more 275-gallon Intermediate Bulk Containers (a.k.a. “totes”), specialty PFAS-free pumps and hoses, sourced as specified by ECT2, and medium-duty truck transport. The leachate samples will be collected by TRC and delivered to ECT2’s laboratory in Fuquay-Varina, NC. Earlier flow meter readings furnished by OCSW in mid-2025 indicate a probable flow rate of 1,300 to 2,000 gallons per day, but in late 2024 the leachate was not flowing. Thus, we anticipate setting up the tote on the back of a flatbed truck or trailer and letting the sampling pump run for a few hours to a couple of days with periodic supervision. Task 2 - PFAS Treatability Bench Testing: This task will be conducted by ECT2 under a subcontract to TRC, in accordance with a scope described in the attached supplemental proposal. ECT 2 has proposed two stages of work, which warrants explanation: • Stage 1 FOAM-X Concentration Bench Study • Stage 2 Three-point Isotherm Bench Study Stages 1 and 2 are the prescribed and originally recommended bench-scale treatability study outlined in TRC’s Leachate PFAS Final Draft Report dated September 15, 2025. Stage 1 evaluates the foam concentration process with three di1erential scenarios involving ECT2’s proprietary process and admixtures, i.e. “boosting” agents, along with laboratory testing to assess the e1ectiveness of the separation process. Stage 2 evaluates the e1icacy of di1erential adsorption media on the foam concentrate with laboratory analytical testing. Though priced separately, these stages work in tandem to evaluate PFAS reduction potential in the leachate, as if it were a “pretreatment” process prior to discharge to OWASA. The combined cost for Stages 1 and 2 is $30,300. This cost excludes the acquisition of one tote of leachate and transportation to/from the lab in Fuquay-Varina, NC. We believe this work will require 6 to 8 weeks to complete after ECT2 receives the samples. TRC will provide sufficient oversight to thoroughly understand the various trials, but we may not be able to communicate details of proprietary equipment, admixtures, holding times, and such. The earlier version of this task order prepared in October 2025 included scaled up field trials of a destructive process (by Axine) using treated and untreated leachate. This third-party testing is not included in this revised Task Order. Docusign Envelope ID: 7BBC917B-EAAD-41A1-899F-622B1233BDFC