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Perchlorate - The BATs for removal of perchlorate in water are: ion exchange and <br />biological fluidized bed reactor. Perchlorate was detected above the PHG in the local <br />groundwater (Well 24). The City is in compliance with the MCL for perchlorate. The <br />estimated cost to reduce perchlorate levels in local groundwater to below the PHG of 1 <br />tag /I using ion exchange was calculated. Because the DLR for perchlorate is 4 pg /l, <br />treating perchlorate to below the PHG level means treating perchlorate to below the <br />DLR of 4 lag /l. There are numerous factors that may influence the actual cost of <br />reducing perchlorate levels to the PHG. Achieving the water quality goal for perchlorate <br />could range from $131,000 to $282,000 per year, or between $2.92 and $6.31 per <br />household per year. <br />All Contaminants .- In addition, a cost estimate to treat all water produced or <br />purchased by the City using ion exchange and reverse osmosis to remove all the <br />contaminants detected above the PHGs or MCLGs was calculated. All the <br />contaminants listed in the attached table may be removed to non - detectable levels by <br />ion exchange and reverse osmosis, except total coliform bacteria. As shown on the <br />attached table, achieving the water quality goals for all contaminants, except total <br />coliform bacteria, using ion exchange and reverse osmosis could range from <br />$8,760,000 to $73,900,000 per year, or between $196 and $1,650 per household per <br />year. <br />For additional information, please contact Mr. Thomas Dix, Water Services <br />Quality Coordinator, at (714) 647 -3316, or write to the City of Santa Ana, 220 <br />South Daisy Avenue, Santa Ana, California 92703. <br />City of Santa Ana <br />Exhibit 1 <br />75C -9 <br />2016 PHG Report <br />