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Kimley>»Horn <br />Table 3: Lead Rankings by Location and WTP <br />Location <br />Year <br />Lead Rank <br /># of Samples <br />WTP <br />1850 6th St <br />Aug -1 1 <br />50 <br />50 <br />OSLO <br />681 23rd Place SW <br />Aug -11 <br />47 <br />50 <br />OSLO <br />856 10th Court <br />Aug -11 <br />49 <br />50 <br />OSLO <br />24 Highland Drive SW <br />Aug -11 <br />48 <br />50 <br />OSLO <br />1021 2nd Street <br />Aug -11 <br />42 <br />50 <br />OSLO <br />1050 31st Ave <br />Aug -11 <br />40 <br />50 <br />OSLO <br />2206 16th Ave <br />Aug -14 <br />50 <br />50 <br />OSLO <br />8345 Chinaberry Road <br />Aug -14 <br />49 <br />50 <br />HOBART <br />2075 7th Drive SW <br />Aug -14 <br />48 <br />50 <br />OSLO <br />9612 Riverside Drive <br />Aug -14 <br />47 <br />50 <br />HOBART <br />675 4th Street <br />Dec -15 <br />50 <br />50 <br />OSLO <br />2465 17th Ave SW <br />Dec -15 <br />49 <br />50 <br />OSLO <br />1405 82nd Ave <br />Dec -15 <br />48 <br />50 <br />OSLO <br />1175 Winding Oaks <br />Dec -15 <br />47 <br />50 <br />HOBART <br />1980 Coco Plum Lane <br />Jun -16 <br />49 <br />50 <br />HOBART <br />1235 Palmetto Court <br />Jun -16 <br />48 <br />50 <br />HOBART <br />8388 Calamandren Way <br />Jun -16 <br />50 <br />50 <br />HOBART <br />2046 8th Ave SW <br />Jun -16 <br />47 <br />50 <br />OSLO <br />5 Sunset Drive <br />Aug -19 <br />52 <br />52 <br />HOBART <br />302 Citrus Ave <br />Aug -19 <br />51 <br />52 <br />HOBART <br />869 Robin Lane <br />Aug -19 <br />50 <br />52 <br />HOBART <br />449 Alamonda Ave <br />Aug -19 <br />49 <br />52 <br />HOBART <br />Page 20 <br />As shown, over time, the highest-ranking sites appear to have shifted from areas served by Oslo WTP to <br />areas in the system primarily served by Hobart. The following graph presents IRCU's lead sample data <br />with respect to other nearby treasure coast utilities that utilize similar source water and treatment <br />techniques. The figure also displays the lead trigger level (TL) that is proposed under the Lead and Copper <br />Revision Rule (not promulgated at the time of this report). Amongst other proposed requirements, such as <br />LSL replacement and public outreach, the TL requires utilities with 90th percentile values between 10-15 <br />ppb to initiate planning, additional monitoring (annually) and implement treatment requirements in effort to <br />mitigate lead corrosion rates. IRCU has maintained 901h percentile values below 5 ppb, which EPA defines <br />as the Practical Quantitation Level (PQL) for lead. This presents a lesser degree of confidence that lead is <br />present in the finished water at the reported concentration. <br />:I <br />