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Optional Task - Bench Scale Pilot Testing The following proposed scope of work is considered for a single well site. Multiple well sites with varying water qualities can be tested to provide additional information. Bench -scale testing of the three adsorbent materials will be conducted using the Rapid Small -Scale Column Test (RSSCT) procedure. The test procedure was developed at Michigan Technological University and has since become a standard test procedure in the water industry. Specifically, the RSSCT method is described in ASTM Standard Method D-6586-03 titled: "Standard Practice for the Prediction of Contaminant Adsorption on GAC in Aqueous Systems Using Rapid Small -Scale Column Tests". In this test, each adsorbent will be crushed to a smaller size (140x 170 mesh) and put into a small column, which becomes a small-scale replica of the large-scale vessel. The operating time for the small-scale column is a fraction of that for the large-scale vessel, allowing for a faster prediction of the time to breakthrough and the replacement frequency of the adsorbent in the full-scale application. The design of the RSSCT column relies on information regarding the anticipated full-scale plant design and operation such as projected vessel size and flowrate per vessel. Three (3) RSSCT columns will be operated in parallel to test three adsorbents on the same test water. The selection of the three adsorbents material to be tested will be made in consultation with Santa Ana. Task 1— Test Plan. Prior to initiation of testing, the EEC Team will prepare an experimental testing plan and submit it to Santa Ana for review. After receiving Santa Ana's comments and approved modifications, the EEC Team will finalize the test plan. Task 2 — Water Collection. Several 55-gallon drums of water will be required to conduct this study. The EEC Team will bring the required number of drums with new HDPE liners to the well site on a truck. With assistance from City staff, the EEC Team will fill the barrels with water from a pre -selected connection point and bring them back to WQTS' laboratory in Los Angeles. Task 3 — Testing. After receipt of the water, the EEC Team will begin testing the three selected adsorbents. The EEC Team will conduct the tests, collect all samples, and submit them to the Lab for analysis. The source water will also be tested for general water quality parameters including pH, alkalinity, calcium, conductivity, bromide, and Total Organic Carbon (TOC) concentrations. Task 4 Reporting. After the testing is completed and the results are received from the laboratory, the EEC Team will prepare and submit to Santa Ana a Technical Memorandum summarizing the testing procedures and the testing results. Deliverables 1. Draft Test Plan (Electronic, pdf format). 2. Final Test Plan (Electronic, pdf format). 3. Technical Memorandum of Results (Electronic, pdf format). EEC Environmental 20 November 17, 2022