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Kim ey>>> Horn Page 25 <br />Figure 12: Treasure Coast Utilities Copper 90th Percentile Data <br />1.5 <br />Treatment <br />Stabilization Method <br />TC Utility <br />1.4 <br />Caustic, Corrosion Inhibitor <br />TC Utility <br />2 RO & Blend <br />Raw Water Blend, Caustic <br />TC Utility <br />3 RO <br />CO2, Caustic, Corrosion Inhibitor <br />1.2 <br />4 NF & Rend <br />Caustic, Corrosion Inhibitor <br />TC Utility <br />1.1 <br />CO2, Caustic, Corrosion Inhibitor <br />TC Utility <br />6 RO & Lime Softening <br />1.0 <br />TC Utility <br />Corrosion Control (CC) <br />Caustic, Blending <br />in place <br />0.9 <br />0.8 <br />• <br />0.7 <br />0.6 <br />• <br />0.5 <br />; <br />0.4 <br />.............. <br />! .. <br />0.3 <br />' <br />0.2 <br />r �• �' , . <br />0.1 <br />#................� <br />...... .... <br />..............:1�.,:.: �, `�' a:.'.....: <br />s <br />0.0 <br />Jul -09 Nov -10 Apr -12 <br />Aug -13 Dec -14 May -16 Sep -17 <br />Feb -19 Jun -20 Oct -21 <br />--dpa IRCU - Copper <br />TC Utility 1 - Copper <br />TC Utility 2 - Copper <br />O ... TC Utility 3 - Copper <br />TC Utility 4 - Copper <br />TC Utility 5 - Copper <br />•••0 ... TC Utility 6 - Copper <br />... ..• -C Utility 7 - Copper <br />— LCR AL <br />• • • • • CC System in Place <br />Utility <br />Treatment <br />Stabilization Method <br />TC Utility <br />1 RO & NF <br />Caustic, Corrosion Inhibitor <br />TC Utility <br />2 RO & Blend <br />Raw Water Blend, Caustic <br />TC Utility <br />3 RO <br />CO2, Caustic, Corrosion Inhibitor <br />TC Utility <br />4 NF & Rend <br />Caustic, Corrosion Inhibitor <br />TC Utility <br />5 RO & NF <br />CO2, Caustic, Corrosion Inhibitor <br />TC Utility <br />6 RO & Lime Softening <br />Caustic, Corrosion Inhibitor <br />TC Utility <br />7 1 RO & Lime Softening <br />Caustic, Blending <br />As shown, IRCU's copper sample data is relatively consistent with seven (7) analogous water purveyors <br />located in the treasure coast area and in compliance with the LCR. The slight variation in copper 901h <br />percentile is noted and may be attributed to the pH variances in the distribution system. However, the <br />copper data is indicative of non -corrosive water and correlates closely with other neighboring utilities along <br />the southeast and Treasure Coast. <br />