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Water Treatment. The City does not currently operate a water treatment plant. The <br />current water supply does not violate any of the Primary Drinking Water Standards <br />provided for in the Safe Drinking Water Act. Therefore, water treatment would be <br />required only to treat for secondary contaminants and aesthetic purposes. Because of <br />this, the existing City Capital Improvement Program (CIP) projects constructing a water <br />treatment plant within approximately five years. <br />Table 13.5 is a summary of average water quality data for the system. Variations in <br />quality may occur periodically due to minor differences in concentrations of each <br />contaminant and depending on which well or combination of wells in operation. <br />Planning for water treatment will occur within the design of the RTC site. Funding for a <br />water treatment facility needs to be identified concurrent with approval for the RTC. <br />This facility should be on line consistent with 60% of the RTC site or completion of wells <br />#6 and #7. <br />Table 13.5: Water System Quality Data <br />Parameter <br />Average Level of <br />Water Quality <br />Parameter' <br />Primary <br />Drinking Water <br />Standard <br />Secondary <br />Drinking Water <br />Standard <br />Langelier Index (standard unit) <br />Total Iron (mg/1 as Fe) <br />Manganese (m,/1 as Mn) <br />Calcium (mg/1 as Ca) <br />Calcium Hardness (mg/1 as <br />CaCO3) <br />Magnesium (mg/1 as CaCO3) <br />Magnesium Hardness (mg/1 as <br />CaCO3) <br />Total Hardness (mg/1 as <br />CaCO3) <br />Sodium (mg/1 as Na) <br />Arsenic (mg/1 as As) <br />Chloride (mg/1 as C1) <br />Sulfate (mg/1 as SO4) <br />Total Alkalinity (mg/1 as <br />CaCO3) <br />pH (Standard Unit) <br />Total Dissolved Solids (mg/1) <br />0.43 <br />0.87 <br />0.21 <br />58 <br />145 <br />12 <br />50 <br />195 <br />8 <br />0.006 <br />15 <br />4.83 <br />0.3 <br />0.05 <br />0.010 <br />250 <br />400 250 <br />221 <br />7.9 6.5 — 8.5 <br />210 500 <br />(1) Based on data collected on 4/6/99 and extrapolated from the 1999 Water System Study. In <br />addition, each parameter has been normalized based on average annual pumping times and rates <br />for each well. <br />The City currently adds chlorine, fluoride, and polyphosphate to the raw water at each <br />well -house. Chlorine is added as a protective barrier against harmful pathogens that may <br />enter the water system from the raw well water or through breaks or cross connections in <br />the distribution system. Fluoride is added as a dietary supplement that aids in the <br />13-4 <br />