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Chemical <br />Alternative 1 Alternative 2 <br />TENNIS HANSEN TENNIS HANSEN TO8 TO8 TENNIS HANSEN <br />Concentration [% weight]12.5%12.5%25.0%25.0%25.0%25.0%25.0%25.0% <br />Specific Gravity 1.22 1.22 1.15 1.15 1.2 1.2 1.2 1.2 <br />Average Annual Production Rate [MGD]1.6 1.6 1.6 1.6 3.1 3.1 1.6 1.6 <br />Daily Chemical Usage - Max Dose, Average Flow [gpd]30.8 30.8 3.3 3.3 10.4 10.4 5.2 5.2 <br />Annual Use - Max Dose [gal/yr]11225 11225 1191 1191 3804 3804 1902 1902 <br />Cost [$/gal]3.00$ 3.00$ 1.50$ 1.50$ 3.47$ 3.47$ 3.47$ 3.47$ <br />Annual Cost 33,674$ 33,674$ 1,786$ 1,786$ 13,199$ 13,199$ 6,600$ 6,600$ <br />Annual Chemical Cost, Time Adjusted (Rounded)34,330$ 34,330$ 1,820$ 1,820$ 13,200$ 13,200$ 6,600$ 6,600$ <br />Notes: <br />2. Fluoride costs are not time adjusted since the cost per gallon was provided by the City of Pleasanton in February 2026. <br />1. Sodium hypochlorite and liquid ammonia sulfate costs are from the Regional Groundwater Facilities Feasibility Study prepared by LSCE (2025). <br />Pleasanton GW Supply Alternatives Study <br /> Project Alternatives Estimated Flouridation and Chloramination Costs (Class 5) <br />Facility Alternative 3 Alternative 3 Alternative 3 <br />Hydrofluorosilicic AcidSodium Hypochlorite (SHC) Liquid Ammonium Sulfate (LAS) <br />Page 2 of 2 3/30/2026