These TMDLs address certain nutrient impairments in the Middle St. Johns River Basin, and Charlotte Harbor Basin. Specifically, the nutrient TMDL rules being proposed for adoption are for the DeLeon Spring (WBID 3424) and Gemini Springs (3424Z), Sanibel Slough West (WBID 2754), and Sanibel Slough East (2872A). The DeLeon Spring and Gemini Springs waterbodies were verified for nutrient impairments because elevated concentrations of nitrate contributed to an imbalance of flora caused by algal smothering in the spring run; Sanibel Slough (West and East) waterbodies were verified for nutrient impairments due to elevated chlorophyll a concentrations, using the methodology established in Chapter 62-303, F.A.C. This rulemaking has been given an OGC case number 17-0849 for rule 62-304.505 and 17-0850 for rule 62-304.805.