10929686, 62-304.300 - Florida Administrative Rules, Law, Code, Register

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Notice: 10929686

Notice of Proposed Rule

Department:

DEPARTMENT OF ENVIRONMENTAL PROTECTION

Chapter:

TOTAL MAXIMUM DAILY LOADS

Overview

RULE:

62-304.300

St. Marks River Basin TMDLs

PURPOSE:

The purpose of the rule is to adopt new Total Maximum Daily Loads (TMDLs), and their allocations, for turbidity (addresses aquatic life impairment), total ammonia (addresses un-ionized ammonia impairment), 5-day biological oxygen demand (BOD5), total nitrogen (TN), and total phosphorus (TP) that have caused low dissolved oxygen (DO) and nutrient impairments for certain waters within the St. Marks River Basin.

SUMMARY:

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.

RULEMAKING AUTHORITY:

403.061, 403.067 FS.

LAW:

403.061, 403.062, 403.067 FS.

PRINT PUBLISH DATE:

1/20/2012 Vol. 38/03

COMMENTS:

From 1/20/2012 To 2/10/2012 (21 Days)
The public comment period for this notice has already expired.

REFERENCE MATERIALS:

No reference(s).

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