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NOVEMBER 2021 | 8 Task 4.1 – PFAS Treatment Media Procurement TM Carollo will prepare a TM to define the recommended procurement process that includes topics of procurement (e.g., vendor prequalification, selection criteria, media testing, bid evaluation, appeals); contracting (e.g., installation terms, contract duration, media disposal method); and technical requirements. The procurement process will likely include the following key steps: 1. Prepare draft procurement documents. 2. Review procurement documents with the City for compliance with City procurement practices and other technical comments. The procurement documents will be finalized based on City comments. 3. Issue procurement documents for GAC media suppliers to participate in Phase II RSSCT. 4. Evaluate vendor responses to select multiple media (up to six assumed) for testing. 5. Conduct RSSCTs and estimate breakthrough/replacement frequency. 6. Estimate life-cycle costs based on test results and media pricing provided by the vendor. 7. Recommend media(s) for award. Task 4.2 – PFAS Treatment Media Pre-Purchase Contract Documents Carollo will prepare PFAS treatment media pre-purchase contract documents, including all front-end specifications, technical specifications, and supporting drawings, to allow the City to pre-purchase the PFAS treatment media. Based on vendor bids and media testing results, Carollo will determine the lowest life-cycle cost media and make a recommendation for award to the City. Task 4.3 – PFAS Media Testing Carollo will perform RSSCT during the PFAS treatment media procurement to estimate media breakthrough and replacement frequencies using methods consistent with the Basis of Design phase. Carollo will prepare and submit a draft Test Plan for City/California Division of Drinking Water (DDW) review. After incorporating City/DDW comments, the Test Plan will be finalized and be the basis for conducting RSSCT. Sample water for testing will be collected by the City. Carollo will provide sample collection containers and freight services for transporting the samples to the lab. Testing will be performed by Arizona State University. This task includes selecting up to six GAC media for testing with one RSSCT per media for a total of up to six columns. Up to ten PFAS samples will be collected from each column and analyzed by Eurofins Lab per EPA Method 537.1 to characterize breakthrough, which is defined as any PFAS compound (from Method 537.1) exceeding Consumer Confidence Report Detection Levels (General Order DW-2021-001-DDW; Exhibit B). Eurofins Lab is approved by the DDW for this testing. Carollo will analyze and model results to estimate media replacement frequencies and calculate life-cycle costs for each media. Task 4 Deliverables: · Draft and Final TM to summarize the recommended pre‑purchase process for PFAS treatment media. · Draft and Final media testing plan. · Draft and Final PFAS treatment media pre‑purchase contract documents. · Draft and Final TM to summarize GAC RSSCT testing.