These new TMDLs address aquatic life, un-ionized ammonia, nutrient, and low DO impairments in the St. Marks River Basin. Specifically, the TMDL rules being proposed for adoption are for Munson Slough above Lake Munson, Lake Munson, and Munson Slough below Lake Munson. These waterbodies were verified as impaired using the methodology established in Chapter 62-303, F.A.C. The turbidity target of 31 NTU was set to meet the turbidity criterion, the total ammonia target of 0.32 mg/L was set to meet the un-ionized ammonia criterion of 0.02 mg/L, the TN and TP targets were set to meet a DO criterion of 5.0 mg/L in both Munson Slough and Lake Munson and a Trophic State Index of 56 in Lake Munson. The target concentration of turbidity (Lake Munson) was established using a percent reduction, the total ammonia target (Munson Slough below Lake Munson) was established using a regression model, the concentrations of TN and TP were established using reference stream conditions (Munson Slough above Lake Munson) and the Watershed Management model in combination with an empirical equation (Lake Munson). This rulemaking has been given OGC Case Number 09-0155.