Numeric Nutrient Criteria (NNC) - Narrative Nutrient Criteria Waters

Waterbodies and waterbody segments for which the Department has determined that only the narrative nutrient criterion currently applies based on available data and information. This does not represent an exhaustive or complete list of such waters, only those waters where an affirmative demonstration has been made that one or more of the numeric nutrient criteria exemptions apply. The narrative water quality criteria for nutrients in paragraphs 62-302.530(47)(a) and (b), F.A.C., applies to all Class I, Class II, and Class III waters. This criterion has been numerically interpreted in 62-302.531, F.A.C., for the majority of the waterbodies in the State of Florida. However, only the narrative nutrient criterion is in effect for wetlands, tidal streams, non-perennial streams, and ditches, canals and other conveyances, or segments of conveyances that are man-made, or predominantly channelized, unless a site specific numeric interpretation has been established by the Department. Provisions for exempting a waterbody are provided in paragraphs 62-302.200(36)(a) and (b), F.A.C., and Section 62-302.532, F.A.C, and described in the document titled 'Implementation of Florida's Numeric Nutrient Standards', dated April 2013 (http://www.flrules.org/Gateway/reference.asp?No=Ref-02905).Until a Class I or III stream segment is identified as meeting the provisions in paragraphs 62-302.200(36)(a) or (b), F.A.C., the criteria in Rule 62-302.531(2)(c), F.A.C., will apply. Interested parties wishing to distinguish the characteristics of a waterbody with respect to provisions in paragraph 62-302.200(36), F.A.C., may provide the Department with the applicable information set forth in the stream definition. A clear delineation of the geographic boundaries of the segment in question is necessary so that the Department knows exactly where applicable criteria apply. Delineation of segment boundaries can include physical, biological, and chemical information, such as intersections of tributaries into a segment, control structures, the interface of wetlands, or other factors that indicate that the homogeneous physical, biological, or chemical condition of the segment would change at the boundary. Only narrative nutrient criteria apply to wetlands or to tidal tributaries that fluctuate between predominantly marine and predominantly fresh waters during typical climatic and hydrologic conditions unless specifically provided by name in subsection 62-302.532(1), F.A.C. The determination of whether a segment is tidally influenced can be made using either chloride or specific conductance data that were collected during typical hydrologic conditions, taking into account tidal cycles and seasonal and climatic variability. The information (continuous or frequent grab sampling data) that demonstrates changing salinity conditions during a typical tidal cycle is necessary for the Department to establish that a segment is exempt from numeric nutrient criteria under the tidal creek provisions. Please reference the metadata for contact information.本数据集涵盖经佛罗里达州主管部门依据现有数据与信息判定，目前仅适用叙述性营养盐标准的水体及水体片段。本清单并非此类水体的穷尽式完整名录，仅包含经实证证明符合一项或多项数值型营养盐标准豁免条款的水体。见于佛罗里达行政法规（Florida Administrative Code, F.A.C.）第62-302.530(47)(a)、(b)款的营养盐叙述性水质标准，适用于所有I类、II类及III类水体。针对佛罗里达州绝大多数水体，该标准的数值化阐释条款见于佛罗里达行政法规第62-302.531款。然而，对于湿地、潮汐溪流、非常年溪流、人工修建或主体渠化的沟渠、运河及其他输水构筑物或其片段，目前仅适用叙述性营养盐标准，除非主管部门针对该场地制定了专属的数值化阐释标准。水体豁免条款见于佛罗里达行政法规第62-302.200(36)(a)、(b)款及第62-302.532条，并在2013年4月发布的《佛罗里达州数值型营养盐标准实施细则》（文档链接：http://www.flrules.org/Gateway/reference.asp?No=Ref-02905）中予以说明。在I类或III类溪流片段被认定符合佛罗里达行政法规第62-302.200(36)(a)或(b)款的豁免条款之前，将适用佛罗里达行政法规第62-302.531(2)(c)款规定的标准。有意向根据佛罗里达行政法规第62-302.200(36)款的条款明确某水体相关特性的利害关系方，可向主管部门提交溪流定义中载明的相关适用信息。需明确界定所涉水体片段的地理边界，以便主管部门精准确定适用标准的覆盖范围。水体片段边界的界定可依据物理、生物及化学信息，例如支流汇入片段的交汇点、管控构筑物、湿地交界带，或其他可表明该片段均质物理、生物、化学条件在边界处发生变化的因素。在典型气候及水文条件下，盐度在海水主导与淡水主导之间波动的潮汐支流，以及湿地，仅适用叙述性营养盐标准，除非佛罗里达行政法规第62-302.532(1)款明确以名称指定豁免情形。可通过典型水文条件下采集的氯化物或比电导率数据，并结合潮汐周期、季节及气候变异情况，判定某片段是否受潮汐影响。需提供可证明典型潮汐周期内盐度变化情况的信息（连续采样数据或高频瞬时采样数据），以便主管部门认定某片段符合潮汐溪流条款下的数值型营养盐标准豁免条件。如需获取联系方式，请查阅元数据。