5403305, 62-304.415 - Florida Administrative Rules, Law, Code, Register

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Notice: 5403305

Notice of Proposed Rule

Department:

DEPARTMENT OF ENVIRONMENTAL PROTECTION

Chapter:

TOTAL MAXIMUM DAILY LOADS

Overview

RULE:

62-304.415

Lower St. Johns River Basin TMDLs

PURPOSE:

The purpose of the proposed rule is to revise the Total Maximum Daily Load (TMDL), and its allocation, for the Lower St. Johns River for Total Phosphorus and Total Nitrogen. The nutrient TMDLs for the marine and fresh water portions of the LSJR are being revised to implement the Site-Specific Alternative Criteria for Dissolved Oxygen that was adopted for the marine portion of the river and to address changes to the allocation that were made during development of the Basin Management Action Plan (BMAP) for the TMDL.

SUMMARY:

This TMDL addresses the nutrient impairment in the Lower St. Johns River, which was verified as impaired by nutrients using the methodology established in Chapter 62-303, Identification of Impaired Surface Waters, Florida Administrative Code. The TMDL is based on the Pollutant Load Reduction Goal (PLRG) for the river developed in by the St. Johns River Water Management District (SJRWMD). The SJRWMD used a suite of models to determine the assimilative capacity of the river, including a watershed model (the Pollution Load Screening Model) to estimate nonpoint source loads, a hydrodynamic model of the river (the Environmental Fluid Dynamics Code model, or EFDC Model) to simulate mixing and transport of nutrients within the river, and a water quality model [the Corps of Engineers Quality Integrated Compartment Model (CE QUAL-ICM), Version 2] to simulate the transformation of nutrients and processes affecting eutrophication within the river. The rule establishes separate TMDLs for the fresh (for Total Nitrogen and Total Phosphorus) and estuarine (Total Nitrogen only) portions of the river.

RULEMAKING AUTHORITY:

403.061, 403.067 FS.

LAW:

403.031, 403.061, 403.062, 403.067 FS.

PRINT PUBLISH DATE:

3/21/2008 Vol. 34/12

COMMENTS:

From 3/21/2008 To 4/11/2008 (21 Days)
The public comment period for this notice has already expired.

REFERENCE MATERIALS:

No reference(s).

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