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12/12/24 Item 5.13. <br />Aug -11:: `F` <br />0.008 <br />0.15iF � � .: <br />0.002. <br />'i, 0.007. <br />0.017 <br />TETRA TECH <br />1.3. <br />Copper Tap Sampling Results <br />m <br />OL19 <br />%. ,.. .a, <br />0.012 <br />;.. <br />--0.038 <br />COPPW <br />50 ---- <br />0.022 <br />0.015 <br />• Action level of 1.3 mg/L <br />' <br />50 . <br />• Results show that the copper concentrations►"*'• <br />0:081 <br />0.054 <br />measured in 2014 and 2015 were lower than those <br />+s, <br />... <br />fl wri . <br />0.069 <br />in more recent years° <br />0.047 <br />0.151'x. <br />r..; . .. <br />• The most recent, August 2022, value of the 90tH <br />M ...>`.: <br />0.0871 <br />:. <br />0.075 <br />i 'Y <br />percentile copper tap sample concentration was <br />RA <br />R► <br />iiw+.rui <br />- <br />52 <br />0.13 mg/L which is only 10% of the action level <br />0.056 <br />0.037 <br />0130 <br />J� <br />62 <br />Aug -11:: `F` <br />0.008 <br />0.15iF � � .: <br />0.002. <br />'i, 0.007. <br />0.017 <br />1.3. <br />50 <br />m <br />OL19 <br />%. ,.. .a, <br />0.012 <br />;.. <br />--0.038 <br />50 ---- <br />0.022 <br />0.015 <br />0.051: : <br />' <br />50 . <br />0:081 <br />0.054 <br />0.202 <br />:n .K <br />b0 <br />0.069 <br />_. <br />0.047 <br />0.151'x. <br />r..; . .. <br />50 <br />M ...>`.: <br />0.0871 <br />:. <br />0.075 <br />i 'Y <br />0.178,:^ <br />= <br />52 <br />0.056 <br />0.037 <br />0130 <br />62 <br />Copper Tap Sampling Results <br />• Map shows the locations of the copper <br />tap sampling by year with results greater <br />than the 90th percentile <br />• All values were less than 30% of the <br />regulatory action level (1.3 mg/L) <br />• From a regulatory perspective, the <br />system is within compliance and action <br />to further optimize corrosion control <br />treatment is not required <br />• 90th percentile concentrations were <br />randomly distributed and did not <br />indicate a localized water quality issue <br />i <br />