Perdido River and Bay - Florida Department of Environmental ...

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50 Water Quality Status Report: Perdido River and Bay Table 3.3: Categories for Waterbodies or Waterbody Segments in the 2002 Integrated Report Category Description Comments 1 Attaining all designated uses If use attainment is verified for a waterbody or segment that was previously listed as impaired, the Department will propose that it be delisted. 2 Attaining some designated uses and insufficient or no information or data are present to determine if remaining uses are attained 3a 3b 3c 3d 4a 4b 4c No data and information are present to determine if any designated use is attained Some data and information are present but not enough to determine if any designated use is attained Enough data and information are present to determine that one or more designated uses may not be attained according to the Planning List methodology Enough data and information are present to determine that one or more designated uses are not attained according to the Verified List methodology Impaired for one or more designated uses but does not require TMDL development because a TMDL has already been completed If attainment is verified for some designated uses of a waterbody or segment, the Department will propose partial delisting for the uses attained. Future monitoring will be recommended to determine if remaining uses are attained. Future monitoring will be recommended to determine if designated uses are attained. Future monitoring will be recommended to gather sufficient information and data to determine if designated uses are attained. This indicates a waterbody or segment is potentially impaired for one or more designated uses. These waters will be prioritized for future monitoring to verify use attainment or impaired status . This indicates that a waterbody or segment exceeds Verified List evaluation criteria and may be listed as impaired at the end of Phase 2 of the watershed management cycle. However, the data have not yet been fully evaluated and the waters have not been formally verified as impaired. Further monitoring and analysis may be necessary. After the EPA approves a TMDL for the impaired waterbody or segment, the TMDL will be included in a Basin Management Action Plan to reduce pollutant loading toward attainment of designated use(s). Impaired for one or more designated uses but does not require TMDL water quality standards within a reasonable time frame are Pollutant control mechanisms designed to attain applicable development because the water will either proposed or in place. attain water quality standards due to existing or proposed measures Impaired for one or more designated uses but does not require TMDL development because impairment is not caused by a pollutant 5 One or more designated uses are not attained and a TMDL is required This category includes waterbodies or segments that are impaired because of naturally occurring conditions or other causes of pollution. The impairment is not caused by specific pollutants. (See sidebar on previous page for a discussion of the difference between the terms “pollutant” and “pollution.”) Waterbodies or segments in this category are impaired for one or more designated uses by a pollutant or pollutants. Waters in this category are included on the basin-specific Verified List adopted by the Department’s Secretary as Florida’s impaired waters list and submitted to the EPA as Florida’s 303(d) list of impaired waters at the end of Phase 2. Note: The descriptions in Table 3.3 are consistent with the EPA’s integrated assessment categories. In the Status Reports for Groups 1 through 3 and in the Assessment Reports for Groups 1 through 2 that were previously produced, Categories 4b and 4c were reversed. That is, the description of Category 4b was previously listed as Category 4c, and the description of Category 4c was listed as Category 4b.
Water Quality Status Report: Perdido River and Bay 51 Category 5 waterbodies are determined to be impaired and require TMDLs. These are included on the Verified List of impaired waters adopted by the Department’s Secretary. However, no waters are formally assigned to this category until the listing process has been completed, even though sufficient data may be available and a waterbody may meet the requirements for impairment under the IWR. Planning Units The Perdido River and Bay Basin encompasses approximately 1,219 square miles, 399.6 square miles of which is within Florida. To provide a more detailed geographic basis for identifying and assessing water quality improvement activities, the basin was subdivided into smaller areas called planning units. Planning units in this basin were based on hydrological units. Planning units help organize information and management strategies around prominent watershed characteristics. Water quality assessments were conducted for waterbody segments within planning units. Each of these smaller, hydrologically based drainage areas within a planning unit is assigned a unique waterbody identification number (WBID). Waterbody segments are assessment units (or geographic information system polygons) that the Department used to defi ne waterbodies when it biennially inventoried and reported on water quality to the EPA under Section 305(b) of the federal Clean Water Act. These WBIDs are the assessment units identified in the Department’s lists of impaired waters submitted to the EPA in reports under Section 303(d) of the Clean Water Act. Although WBIDs often encompass several waterbodies, water quality data usually reflect the main waterbody conditions within a polygon. In some instances, however, the data from several waterbodies within the polygon have been aggregated. As the water quality assessments are refined in Phase 2 of the watershed management cycle, individual waterbodies within these aggregations that have unique water quality concerns will be assigned unique WBIDs and evaluated individually. The Perdido River and Bay Basin contains two planning units: Perdido River and Perdido Bay. Figure 3.2 shows their locations and boundaries. In general, planning units are delineated as the drainage boundaries of watersheds that drain to major rivers and bays. Major river and bay watersheds in the Panhandle are typically defined by unique hydrologic unit (HUC) codes. The remainder of this chapter provides a general description of each planning unit, information on land use and potential point sources of pollution, water quality assessments for individual waterbody segments, and summaries of ecological issues and watershed quality improvement plans and projects. To determine the status of surface water quality in the Perdido River and Bay Basin, chemistry data, biological data, and, if available, fi sh consumption, bathing beach closures, and shellfish-harvesting advisories were evaluated to determine potential impairment. Appendix B contains
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