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City of Centerville <br />Downtown Storm Water Reclamation Project <br />In summary, here are the standards or typical ranges of naturally occurring levels. <br />Pollutant <br />Standard <br />Result (Sample 1) <br />Result (Sample 2) <br />Human Health <br />Arsenic <br />5-20 mg/kg Average <br />4.9 mg/kg <br />5.7 mg/kg <br />Copper <br />50 mg/kg Average <br />5.7 mg/kg <br />6.8 mg/kg <br />Mercury <br />0.020 - 0.625 mg/kg Avg. <br />ND mg/kg <br />0.022 mg/kg <br />pH <br />6.5 — 8.5 Standard Units <br />8.0 Standard Units <br />8.4 Standard Units <br />Chloride <br />N/A <br />ND mg/kg <br />ND mg/kg <br />CPAH's <br />Fluoranthene <br />1080 mg/kg Max <br />0.016 mg/kg <br />ND mg/kg <br />Pyrene <br />N/A <br />0.012 mg/kg <br />ND mg/kg <br />Turf Grass Growth <br />pH <br />6.5 — 7.5** Standard Units <br />8.0 Standard Units <br />8.4 Standard Units <br />Chloride <br /><400 mg/kg <br />ND mg/kg <br />ND mg/kg <br />**Can depend on grass species. <br />Conclusions — Ballfield Soils <br />Levels of heavy metals discovered on-site are well within the range of naturally occurring <br />concentrations or those which can be tolerated without risk to human health. <br />The pH of the soil is within acceptable ranges for human contact. <br />Page 5 <br />6/8/10 <br />Chloride levels were below detectable thresholds in the soil. In the pond water, mild <br />concentrations of chlorides were discovered. Therefore, the chloride level in the soil should be <br />monitored to see whether or not their concentration builds up over time. <br />The full results of these tests will be made available to the public at City Hall. Please feel free to <br />contact me with any questions you may have. <br />Sincerely, <br />Mark Statz <br />City Engineer <br />651-604-4709 <br />cc: Paul Palzer — Public Works Director <br />Randy Neprash, Jeff Peters, Jeff McDowell - Bonestroo <br />108 <br />