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Kimley»>Horn <br />Table 2: IRCU Lead Sample Tap Results <br />Page 19 <br />Sampling <br />Date <br />Average <br />(mg/L) <br />Maximum <br />(mg/L) <br />50th <br />Percentile <br />(mg/L) <br />75th <br />Percentile <br />(mg/L) <br />90th <br />Percentile <br />(mg/L) <br />ActionSample <br />Level <br />(mg/L) <br />Size <br />Aug -11 <br />0.002 <br />0.014 <br />0.001 <br />0.001 <br />0.002 <br />0.015 <br />50 <br />Aug -14 <br />0.001 <br />0.004 <br />0.001 <br />0.001 <br />0.002 <br />0.015 <br />50 <br />Dec -15 <br />0.001 <br />0.001 <br />0.001 <br />0.001 <br />0.001 <br />0.015 <br />50 <br />May -16 <br />0.008 <br />0.360 <br />0.001 <br />0.001 <br />0.002 <br />0.015 <br />50 <br />Dec -16 <br />0.0007 <br />0.0029 <br />0.001 <br />0.001 <br />0.001 <br />0.015 <br />50 <br />Aug -19 <br />0.001 <br />0.0057 <br />0.00064 <br />0.0007875 <br />0.003 <br />0.015 <br />52 <br />Overall, lead levels in the drinking water are well below the action level of 0.015 mg/L, or 15 parts per billion. <br />The slight variation of 1 part per billion from the previous sampling event 3 years prior should be monitored <br />but is not cause for concern. Since this testing is conducted on a triennial basis, there is insufficient data <br />to support the notion that lead corrosion rates have increased. In order to more accurately track lead <br />corrosion, IRCU may consider conducting their own lead and copper sampling (separate from LCR <br />sampling) on a more frequent basis (bi-annually or annually) to have a better understanding of the lead <br />concentration trends. <br />0.016 <br />0.014 <br />0.012 <br />0.010 <br />0.008 <br />E <br />0.006 <br />U) <br />a� <br />0.004 <br />�a <br />m <br />0.000 <br />O <br />J0 <br />�O <br />Figure 9: Lead Sample Tap Results <br />i <br />Date <br />-E 50th Percentile (mg/L) 75th Percentile (mg/L) <br />Action Level (mg/L) ..... CC System in Place <br />90th Percentile (mg/L) <br />The following table presents the sites that exhibited the highest ranking with respect to lead sample <br />results: <br />79 <br />