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PROPOSALFOR <br />On -Call Engineering Design Services <br />Pilot Testing Data and DDW Permitting <br />PFAS Treatment Systems <br />Orange County Water District (OCWD) pilot test of non -potable well (Bessie Well) located in Anaheim, CA <br />near Warner Basin and pilot results at neighboring Water Replenishment District (WRD) sites have all <br />demonstrated excellent ability of many IX resins to successfully remove PFAS containments. <br />Table 4 compares key organic and inorganic water quality data from a generic OCWD well with WRD and <br />OCWD PFAS pilot tests. It is observed that the water quality of the example well is generally similar in PFOA, <br />PFOS, and other relevant IX water quality parameter concentrations to that of OCWD-BESS. Given that the <br />pertinent water quality parameter concentrations are similar between the pilot test source water and the <br />example well, and that the pilot testing has shown several IX products successfully remove PFOA and PFOS, <br />DDW permitted implementation of IX at the example site based off of the OCWD pilot data and a site specific <br />lead -lag performance model to approximate lag performance at the specific example well site. Once water <br />quality data is received a similar comparison would be provided for any Santa Ana wells that require treatment. <br />TABLE 4. COMPARISON OF GENERIC <br />PILOTINGRECENT DATA <br />Description <br />OCWD WELL <br />■CALIFORNIA <br />Example Raw <br />Water from Well <br />in Oran a County <br />WATER QUALITY AND <br />OCWD Pilot <br />_ WRD Pilot <br />- <br />Units <br />Well 1A <br />Bessie Well <br />LHHCWD <br />Well i <br />MTBLW <br />Well #7 <br />Test Type _ <br />-�- <br />Full Scale Pilot <br />Full Scale Pilot <br />IX Resin Tested <br />- <br />Calgon Cal Res 2301, <br />ECT2 SRSIX IC4, <br />Evoqua PSR2+, <br />Purolite Purofine <br />PFA694E <br />Evoqua PSR2+, <br />Purolite Purofine <br />PFA694E, SIR-110-HP, <br />PFCR-2 <br />Sulfate <br />m IL <br />89.8 <br />131 <br />174.0 <br />77.6 <br />Nitrate as N <br />m 1L as N <br />2.44 <br />0.3 <br />2.8 <br />2.5 <br />Alkalinity as CaCO3) <br />m L <br />123 <br />195 <br />200.0 <br />168.0 <br />Chloride <br />m 1L <br />55.6 <br />130 <br />107.0 <br />51.1 <br />Arsenic <br />ppb <br />1.05 <br />6.2 <br />3.0 <br />2.0 <br />Calcium <br />m 1L <br />50.3 <br />82.2 <br />109.0 <br />65.0 <br />Iron <br />u 1L <br />3.3 <br />8.83 <br />NO <br />Manganese <br />u 1L <br />0.7 <br />236 <br />3.0 <br />Sodium <br />m 1L <br />69.0 <br />54.0 <br />Potassium <br />m 1L <br />3.4 <br />5.0 <br />4.0 <br />Magnesium <br />m IL <br />9.35 <br />21.7 <br />21.0 <br />13.0 <br />H <br />Units <br />7.82 <br />7.66 <br />TES <br />m IL <br />366 <br />624 <br />643.0 <br />410.0 <br />Total Organic Carbon <br />rr; L <br />0.22 <br />1.3 <br />0.77 <br />0.81 <br />Perfluoro hexanoic acid <br />PFHxA <br />n IL t <br />5.4 <br />2.8 <br />3A <br />5.1 <br />Perfluorodecanoic acid <br />PFDA <br />n 1L t <br />Nf] <br />3.1 <br />2.0 <br />Perfluoro he tannic acid <br />PFH A <br />n 1L t <br />2.8 <br />2.2 <br />3.7 <br />Perfluoro octanoic acid <br />PFOA <br />n 1L t <br />9.47 <br />16 <br />12.4 <br />15.0 <br />Perfluero rionanoic acid <br />PFNA <br />n 1L t <br />NO <br />2.2 <br />3.0 <br />3.6 <br />Perfluoro butane sulfonic acid <br />PFBS <br />n L OPIL <br />4.2 1 <br />14 <br />6.3 <br />9.0 <br />Perfluero hexane sulfonic acid <br />PFHxS <br />n 1L t <br />8.7 <br />11 <br />1 6.4 <br />6.6 <br />Perfluoro octane sulfonic acid <br />PFOS <br />n L t <br />22 7t <br />23 <br />1 32.2 <br />35,7 <br />Notes: <br />1. Blue cells impact IX performance. <br />2. Green cells can impact Ix performance, depending on amount of metals that are undissolved and could clog the filter. Pre-treatment recommended to remove any <br />particuIales prior to IX treatment. <br />TETRA TECH Page 112 <br />