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