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for what can be retained in the soils. Three of the remaining four sites are close to <br />the threshold. Testing was done on the top 6 inches of soil to be consistent with <br />permitting procedures. <br />16. A storm grab sample within the Pressley Ranch biosolids application sites from July <br />24 of this year had an orthophosphate concentration of 0.86 mg/I: Autosampler <br />orthophosphate concentrations from November 5 of this year ranged from 0.17 mg/I <br />to 0.34 mg/I. <br />17. Continuous orthophosphate monitoring at the mouth of Padgett Branch from April <br />through October of this year shows a range from approximately 0..05 mg/I to 0.4 <br />mg/I, with an average over 0.2 mg/I. <br />18. Tracer analyses from one event detected only one of seven tracers. The same event <br />had a total phosphorus concentration of 0.95 mg/I at the Blue Cypress Lake Road <br />culvert. <br />19. Application rates do not appear to have exceeded permitted rates. <br />5 REGULATORY AND OTHER CONSIDERATIONS <br />20. The upward trend in phosphorus in Blue Cypress Lake will result in a new water <br />quality impairment for total phosphorus in the next cycle of DEP's waterbody <br />assessments. <br />21. Water bodies downstream of Blue Cypress Lake are currently impaired for total <br />phosphorus. <br />22. Microcystis blooms in Blue Cypress Lake have been observed in recent years. <br />Microcystis can produce Microcystin, which is a toxin in the drinking water supply. <br />143 <br />