env305b303d

NOTICE: This geometry of this dataset has been modified by Forsyth County GIS to match the geometry of the county's stream layer. The associated attribute information has not been modified. This ESRI GIS data set is based on the descriptive locations of the listed water bodies within the Year 2008 Integrated 305(b)/303(d) Report, however, it should not be considered as Georgia's approved list. While reasonable effort has been made to ensure this GIS data set accurately reflects the approved list, if discrepancies are found, the water body information in the .pdf documents mentioned below are to be considered official and supercede the GIS data set. On June 6th, 2008, the Georgia DNR Environmental Protection Division's Year 2008 Integrated 305(b)/303(d) Report (also referred to as Water Quality in Georgia 2006-2007) and lists were approved by the United States Environmental Protection Agency's (USEPA). The final and official, approved lists of water body classifications for Rivers/Streams, Lakes/Reservoirs, Coastal Streams, Coastal Beaches, and Sounds/Harbors can be found in .pdf format at https://www.gaepd.com/Documents/305b.html and in the compressed .zip with this GIS data set. This GIS data set represents the State of Georgia assessment of water quality and resulting Year 305(b)/303(d) list of waters prepared in response to Sections 305(b) and 303(d) of the Clean Water Act and in accordance with the USEPA implementing regulations and guidance. Assessed water bodies are classified as assessment pending, supporting or not supporting their designated uses according to a comparison of water quality monitoring results to water quality standards and other pertinent information. New for the Year 305(b)/303(d) list is the designation of Category Tier levels for each assessed water body. The USEPA is requiring Georgia to use these Category Tier levels beginning with year and subsequent 305(b)/303(d) reports to USEPA. Please refer to the .pdf file titled "Summary of Changes to the Format of Y2008 305(b)/303(d) List of Waters" at https://www.gaepd.com/Files_PDF/305b/Y2008_303d/Y2008_Summary_of_Formatting_Changes_List.pdf or in the compressed .zip with this GIS data set for more information about Tier levels. This GIS data set is an ESRI polyline shapefile representing Year 2008 305(b)/303(d) listed Rivers/Streams, Coastal Streams and Coastal Beaches segments at a scale of 1:100,000 in Geographic North American Datum 1983 (NAD83). The majority of the GIS data set is based on previous Georgia EPD GIS shapefiles for the 305(b)/303(d) List for the Years 2006, 2004, 2002 and 2000. Georgia's GIS data set for Year 2008 305(b)/303(d) list has been significantly expanded and improved over previous years GIS shapefiles. All new Rivers/Streams and Coastal Streams segments have been created using the National Hydrography Dataset(NHD) Medium Resolution geodatabase feature class. Beach segments were created by Georgia DNR Coastal Resource Division using aerial photography and color IR DOQQs. When using this GIS dataset, the polylines represent the beginning and end of a listed segment within the state of Georgia. The associated attribute table includes all fields and information within the 305(b)/303(d) list that corresponds to the GIS polyline in addition to USGS Hydrologic Unit Code (HUC) 8 and 10.注意事项：本数据集的几何信息已由福赛思县地理信息系统（GIS）部门修改，以匹配该县溪流图层的几何格式，相关属性信息未作改动。本ESRI地理信息系统数据集基于2008年《综合305(b)/303(d)报告》中所列水体的描述性位置，但不得视为佐治亚州的官方核准清单。尽管已通过合理手段确保本GIS数据集准确反映核准清单，但若发现不符之处，下述PDF文档中的水体信息将视为官方版本，并取代本GIS数据集。2008年6月6日，美国环境保护署（United States Environmental Protection Agency, USEPA）核准了佐治亚州自然资源部（Georgia Department of Natural Resources, DNR）环境保护处发布的2008年《综合305(b)/303(d)报告》（亦称《佐治亚州2006-2007年水质报告》）及配套清单。河流/溪流、湖泊/水库、沿海溪流、沿海海滩以及海湾/港口的最终官方核准水体分类清单，可通过https://www.gaepd.com/Documents/305b.html获取PDF版本，也可在本GIS数据集附带的压缩.zip包中找到。本GIS数据集反映了佐治亚州针对水体水质的评估结果，以及依据《清洁水法》第305(b)和303(d)条款、并符合美国环保署（USEPA）实施细则与指南编制的2008年305(b)/303(d)水体清单。已评估水体将依据水质监测结果与水质标准及其他相关信息的比对结果，划分为待评估、达标支持或不支持指定用途三类。2008年版305(b)/303(d)清单新增了为每一处已评估水体指定类别层级（Category Tier）的要求。美国环保署（USEPA）要求佐治亚州自本年度起，在后续提交给美国环保署的305(b)/303(d)报告中均采用该类别层级标准。如需了解类别层级的更多信息，请参阅题为《Y2008 305(b)/303(d)水体清单格式变更摘要》的PDF文档，其下载地址为https://www.gaepd.com/Files_PDF/305b/Y2008_303d/Y2008_Summary_of_Formatting_Changes_List.pdf，或可在本GIS数据集附带的压缩.zip包中获取该文档。本GIS数据集为ESRI折线形状文件（Shapefile），以1:100000比例尺绘制，采用1983年北美大地基准面（North American Datum 1983, NAD83）地理坐标系，涵盖2008年版305(b)/303(d)清单所列的河流/溪流、沿海溪流及沿海海滩片段。本数据集大部分内容基于佐治亚州环境保护部（Georgia Environmental Protection Division, EPD）此前2006、2004、2002及2000年版305(b)/303(d)清单的GIS形状文件。相较于往年的GIS形状文件，佐治亚州2008年版305(b)/303(d)清单的GIS数据集得到了大幅扩充与优化。所有新增的河流/溪流及沿海溪流片段均采用国家水文数据集（National Hydrography Dataset, NHD）中分辨率地理数据库要素类创建。海滩片段则由佐治亚州自然资源部沿海资源处通过航空摄影与彩色红外数字正射影像图（DOQQs）制作。使用本GIS数据集时，折线代表佐治亚州内所列水体片段的起止点。关联属性表除包含美国地质调查局（United States Geological Survey, USGS）水文单元代码（Hydrologic Unit Code, HUC）8位与10位编码外，还涵盖了与该GIS折线对应的305(b)/303(d)清单中的全部字段与信息。