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

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Mr. Robert Williams February 19, 2026 – Landfill Leachate PFAS Study – Phase 2 Revised Page 3 of 5 Task 3 - Reporting and Project Management: ECT2 will perform foam concentration bench testing per the supplemental proposal. The bench trial will evaluate 3 different flow scenarios for this treatment pathway, i.e., how many runs through the Foamate™ process are required to achieve the desired level of PFAS removal. Next ECT2 will perform a 3-Point Isotherm bench study on three different medias (GAC, Ion Exchange resins SORBIX PURE LC3 and LC5). The Isotherm tests will determine the optimum capture medium for later destruction or isolation – evaluation of mechanisms for destruction and/or isolation are not included in this scope of work. ECT2 assumes PFAS analysis via EPA1633. ECT2’s lab for included PFAS analytical testing, Enthalpy Analytical, is DOD-ELAP certified. TRC will provide OCSW with progress reports during the sample acquisition and bench testing. Upon completion, we will prepare a summary of recommendations for the treatment (or pretreatment) process. The report will describe in brief what treatment process is believed to be effective, the approximate costs and logistics of implementing systems in the field, including access and power requirements, and estimated yearly operating costs. The costs depend mainly on which PFAS need to be reduced or eliminated in the leachate discharge to OWASA, how often the system needs to be serviced (treatment chemicals exchanged), where and how the spent chemicals need to be treated, renewed, or disposed, consistency of the leachate flow rate, and not least, what add-on processes OCSW might want (such as treatment of Volatile Organic Compounds or metals) prior to discharge. SCHEDULE: The following schedule is contingent on when TRC receives the authorization, weather conditions for sampling, coordinating with our subcontractor, i.e., how busy the lab is, and OCSW’s budgetary or scheduling concerns. TRC believes we can initiate sample acquisition within two weeks to four weeks after receiving authorization from OCSW. TRC recommends allowing two weeks’ calendar time for preparation, procurement and delivery. TRC anticipates completion of this phase of work during the second quarter of 2026. FEES: TRC will invoice Orange County monthly on a time and materials basis for our services, with the following recommended not-to-exceed costs. We need to complete our arrangement with the subcontractor with respect to their payment requirements. Typically, we ask for a 10% markup on subtractor invoices. ECT2 may wish to be paid in increments, once at the end of the testing phase, or roll the testing costs into an implementation stage. The budget presented below is a placeholder. OCSW may wish to reduce these costs by assisting Task 1, for instance if OCSW can provide a truck or trailer and driver, TRC will not incur these costs. 1. Sample Acquisition ......................................................................................... $6,700 2. Laboratory Bench-Scale Testing* .................................................................. $30,300 3. Reporting and Project Management ............................................................. $ 9,500 Note: the budget includes allowances for reimbursable costs (mileage, equipment, printing). Subcontractor and equipment expenses are subject to a 10% markup. Docusign Envelope ID: 7BBC917B-EAAD-41A1-899F-622B1233BDFC