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Page 19 Attachment B: Supporting Research November 24, 2020 Update 2 — Research Review Phase of IRL Plan engineer of the project to ensure appropriate nutrient levels are being removed via retention times and to ensure proper water volumes are being treated by the stormwater system. State water quality standards are established by the FDEP are set forth in chapters 62-4, 62-302, 62- 520, and 62-550, F.A.C. These standards are regulated at the state -level review process for permits. Surface and groundwater discharges from stormwater management systems, works, and other projects may not cause or contribute to a violation of state water quality standards. Once the loading is set by the state, County reviewers determine if the treatment is appropriate for the levels needing to be obtained. The engineer of the project determines how much water needs to be held by the stormwater system to reach these levels, and communicates this as part of the County's permit application. County reviewers will communicate back -and -forth with the engineer until adequate revisions have been made based on these calculations. The County should continue to enforce and update its stormwater management -related ordinances as new practices and technologies emerge. The County should also continue working relationships with state reviewers to ensure proper nutrient removal levels and practices are achieved throughout the permitting process as state rules and regulations change. It is important to maintain flood prevention not only for buildings and for homes, but also to reduce the amount of runoff that flows into the canals before having adequate time for nutrients to settle. Excess, untreated stormwater can be detrimental to the Lagoon, so it is especially important to issue, maintain, and verify compliance for these permits throughout their lifecycles to protect and positively impact the quality of the Lagoon. 120