Water Wells and Pollution Sources of Loudoun County, VA
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: Loudoun County, VA, Health Department
- Publication_Date: 20140814
- Title: Water Wells and Pollution Sources of Loudoun County, VA
- Geospatial_Data_Presentation_Form: vector digital data
- Description:
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- Abstract:
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WELLPOLL is a data set of water wells and pollution sources in the county that have been identified and assigned a unique SITE-ID number. Cemeteries are included as a potential groundwater and soil pollution source. Within this data set, the majority of wells are individual potable water wells and the majority of pollution sources are individual sewage disposal (septic/drain field) systems. Other types of wells and pollution sources, like cemeteries, also exist in the data and are listed and explained in the data dictionary. Note that all identified pollution sources are not necessarily causing pollution, but rather, can be simply a potential source of pollution. Information for wells comes primarily from State Groundwater Well Completion (GW2) forms completed by well drilling contractors and varies in accuracy and completeness. Information for pollution sources comes primarily from the Health Department permitting and inspection process and/or date of discovery from field verification. This layer is maintained and administered by the Health Department and Department of Building and Development.
- Purpose:
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WELLPOLL was created to provide an easily accessed record of wells and pollution sources and to link these sites to other geographic data within the GIS. For most records, specific construction information and other physical characteristics are available from the County. This information may be used to aid in the evaluation of the groundwater resource in the case of wells, or of certain types of observed or potential pollution problems in the case of pollution sources.
- Supplemental_Information:
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The WELLPOLL layer was developed in 1988 by the County's Environmental Health Department. Records were entered into a database from 40 years of historical paper files, which exhibited a wide range of completeness and accuracy. This was an on-going process until early 1996 at which time the layer was no longer maintained. In late 2000, the Department of Building and Development began a process of updating the layer by entering data from the permit files, which had accumulated since 1996. Data are stored in the corporate ArcSDE Geodatabase as a point feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN (vertical datum, if applicable, NAVD88), US Survey foot units.
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -77.954511
- East_Bounding_Coordinate: -77.333817
- North_Bounding_Coordinate: 39.321706
- South_Bounding_Coordinate: 38.848383
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: none; Employee generated
- Theme_Keyword: drain field
- Theme_Keyword: pollution source
- Theme_Keyword: storativity
- Theme_Keyword: septic system
- Theme_Keyword: pollution
- Theme_Keyword: groundwater
- Theme_Keyword: yield
- Theme_Keyword: transmissivity
- Theme_Keyword: well
- Theme_Keyword: sewage disposal
- Theme:
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- Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
- Theme_Keyword: health
- Theme:
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- Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
- Theme_Keyword: health
- Place:
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- Place_Keyword_Thesaurus: none; Employee generated
- Place_Keyword: Virginia
- Place_Keyword: County
- Place_Keyword: Loudoun
- Access_Constraints: None
- Use_Constraints:
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These data were generated for use by Loudoun County and are available to the public. These data are intended for use at 1:2400 scale or smaller. Acknowledgement of Loudoun County would be appreciated in products derived from this data.
- Point_of_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, Health Department
- Contact_Position: Public Information Counters
- Contact_Address:
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- Address_Type: mailing and physical
- Address: MS 68
- Address: 1 Harrison Street SE, 2nd Floor
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703)777-0234
- Contact_Electronic_Mail_Address: health@loudoun.gov
- Hours_of_Service: 8:00-5:00 EST, M-F
- Native_Data_Set_Environment:
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Microsoft Windows Server 2008 Version 6.0 (Build 6002) Service Pack 2; ESRI ArcGIS 10.0.5.4400
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
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Retention of attribute accuracy throughout the coverage to geodatabase feature class coversion process was ensured by a QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have, on a record by record basis, identical attribution when comparing all concatenated fields to all the user-defined attribution.
- Logical_Consistency_Report: Topologically clean
- Completeness_Report:
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Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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Retention of coordinate accuracy throughout the coverage to geodatabase feature class conversion process was ensured by a QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have the same record total, and on a record by record basis, area, perimeter, and length differential of less than +/- 0.5%.
- Lineage:
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- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: Loudoun County, VA, Health Department
- Publication_Date: 19880101
- Geospatial_Data_Presentation_Form: Vector digital data
- Type_of_Source_Media: None
- Source_Contribution:
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Loudoun County Health Department decision to develop WELLPOLL coverage in 1998
- Process_Step:
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- Process_Description:
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.Records were entered into a database from 40 years of historical paper files, including State Ground Water Well Completion Forms and Health Department permits, inspections, and field checks. They exhibited a wide range of completeness and accuracy. This was an on-going process until early 1996 at which time the layer was no longer maintained.
- Process_Date: 19880104
- Process_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization:
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Loudoun County, VA, Office of Mapping and Geographic Information (OMAGI)
- Contact_Position: GIS Systems Analyst
- Process_Step:
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- Process_Description:
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The Department of Building and Development began a process of updating the existing layer by entering data from the permit files, which had accumulated since 1996.
- Process_Date: 20000101
- Process_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, Health Department
- Process_Step:
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- Process_Description:
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This data set was part of a batch process that converted legacy data from ArcInfo coverage in Librarian to a single-tiled ArcInfo coverage in preparation for a final coversion to ArcSDE Geodatabase Feature Classes. Data were extracted from Librarian using the EXTRACT TOPOLOGICAL command. Multi-tiled data sets were extracted into multiple coverages and then combined based on the feature type(s). Layers with both polygon and arc feature classes were processed with the Arc commands, MAPJOIN and DISSOLVE. Arc feature classes alone were processed with the Arc commands, APPEND and DISSOLVE. Layers with both arc and point feature classes and point feature classes alone were processed with the Arc command, APPEND. When used, the Arc command, DISSOLVE, was given with the <#all> option. All coverages were then reprojected to HARN 83 using the following .prj file specifications: INPUT PROJECTION STATEPLANE UNITS FEET ZONE 5551 DATUM NAD27 NADCON PARAMETERS OUTPUT PROJECTION STATEPLANE UNITS FEET FIPSZONE 4501 DATUM HPGN NADCON PARAMETERS END This dataset was then converted to a feature class in a geodatabase in ArcSDE
- Process_Date: 20040105
- Process_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, OMAGI
- Spatial_Data_Organization_Information:
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- Indirect_Spatial_Reference: Loudoun County
- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
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- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: Entity point
- Point_and_Vector_Object_Count: 37848
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Map_Projection:
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- Map_Projection_Name: Lambert Conformal Conic
- Lambert_Conformal_Conic:
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- Standard_Parallel: 38.03333333333333
- Standard_Parallel: 39.2
- Longitude_of_Central_Meridian: -78.5
- Latitude_of_Projection_Origin: 37.66666666666666
- False_Easting: 11482916.66666666
- False_Northing: 6561666.666666666
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
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- Abscissa_Resolution: 0.000085115229035903
- Ordinate_Resolution: 0.000085115229035903
- Planar_Distance_Units:
- Geodetic_Model:
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- Horizontal_Datum_Name: D North American 1983 HARN
- Ellipsoid_Name: GRS 1980
- Semi-major_Axis: 6378137.0
- Denominator_of_Flattening_Ratio: 298.257222101
- Entity_and_Attribute_Information:
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- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: GISDBB.GISBROW.WELLPOLL_POINT
- Attribute:
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- Attribute_Label: WE_UPD_SOURCE
- Attribute_Definition: Source that created or edited feature class
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Enumerated_Domain:
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- Enumerated_Domain_Value: 2
- Enumerated_Domain_Value_Definition: County
- Enumerated_Domain:
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- Enumerated_Domain_Value: 1
- Enumerated_Domain_Value_Definition: Legacy (prec2002)
- Enumerated_Domain:
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- Enumerated_Domain_Value: 0
- Enumerated_Domain_Value_Definition: Undetermined
- Enumerated_Domain:
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- Enumerated_Domain_Value: 3
- Enumerated_Domain_Value_Definition: Contract
- Attribute:
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- Attribute_Label: WELLPOLL_ID
- Attribute:
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- Attribute_Label: SHAPE
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
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- Attribute_Label: WE_TYPE_HP
- Attribute_Definition: Describes if the item is a well or pollution source
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Enumerated_Domain:
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- Enumerated_Domain_Value: P
- Enumerated_Domain_Value_Definition: Pollution Source
- Enumerated_Domain:
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- Enumerated_Domain_Value: W
- Enumerated_Domain_Value_Definition: Well
- Attribute:
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- Attribute_Label: WE_ID_SEQ
- Attribute_Definition:
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A sequential cataloging number to create unique SITE-ID numbers when multiple sites of the same TYPE and ID-CODE are completed during the same year.
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User defined text code
- Attribute:
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- Attribute_Label: WE_ID_YEAR
- Attribute_Definition:
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The year the well or pollution source was completed or date of discovery from field verification identifier.
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User defined text code
- Attribute:
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- Attribute_Label: OBJECTID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain:
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Sequential unique whole numbers that are automatically generated.
- Attribute:
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- Attribute_Label: WE_OLD_ID
- Attribute_Definition:
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Same as the SITE-ID except it uses a two-digit year of completion or date of discovery from field verification identifier.
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User defined text code
- Attribute:
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- Attribute_Label: WE_ID_CODE
- Attribute_Definition:
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A four-letter code categorizing the type of well or pollution source
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Enumerated_Domain:
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- Enumerated_Domain_Value: PSBD
- Enumerated_Domain_Value_Definition: Building (e.g. barn)
- Enumerated_Domain:
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- Enumerated_Domain_Value: PCEM
- Enumerated_Domain_Value_Definition: Cemetery
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWCS
- Enumerated_Domain_Value_Definition: Community spring
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWDU
- Enumerated_Domain_Value_Definition: Dug well
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWTS
- Enumerated_Domain_Value_Definition: Test well
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWUN
- Enumerated_Domain_Value_Definition: Unknown well
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWHP
- Enumerated_Domain_Value_Definition: Heat pump well
- Enumerated_Domain:
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- Enumerated_Domain_Value: PSSD
- Enumerated_Domain_Value_Definition: Sewage disposal system
- Enumerated_Domain:
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- Enumerated_Domain_Value: PSTP
- Enumerated_Domain_Value_Definition: Sewage treatment plant
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWNC
- Enumerated_Domain_Value_Definition: Non-community well
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWQM
- Enumerated_Domain_Value_Definition: Water quality monitoring well
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWOB
- Enumerated_Domain_Value_Definition: Observation wel
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWDH
- Enumerated_Domain_Value_Definition: Dry well
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWII
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWSP
- Enumerated_Domain_Value_Definition: Spring
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWIR
- Enumerated_Domain_Value_Definition: Irrigation well
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWIN
- Enumerated_Domain_Value_Definition: Individual well
- Enumerated_Domain:
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- Enumerated_Domain_Value: PSSW
- Enumerated_Domain_Value_Definition: Solid waste/landfill
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWID
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWCO
- Enumerated_Domain_Value_Definition: Community well
- Enumerated_Domain:
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- Enumerated_Domain_Value: WWMN
- Enumerated_Domain_Value_Definition: Monitor well
- Enumerated_Domain:
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- Enumerated_Domain_Value: PSCS
- Enumerated_Domain_Value_Definition: Chemical storage tank
- Attribute:
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- Attribute_Label: WE_SITE_ID
- Attribute_Definition:
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A unique alphanumeric identifier for each well or pollution source. Composed of the four-letter ID-CODE (what the item is), the four-digit year of completion, and a four digit sequential cataloging number.
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User defined text code
- Attribute:
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- Attribute_Label: WE_UPD_DATE
- Attribute_Definition: Date that feature class was created or modified
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User defined text code
- Attribute:
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- Attribute_Label: WE_UPD_USER
- Attribute_Definition:
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Not for public distribution. Internal User ID of editor creating or modifying feature class
- Attribute_Definition_Source: Loudoun County
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, OMAGI
- Contact_Position: Public Information Counter
- Contact_Address:
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- Address_Type: mailing and physical
- Address: MS 65
- Address: 1 Harrison Street SE, 2nd Floor
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703)771-5778
- Contact_Facsimile_Telephone: (703)771-5075
- Contact_Electronic_Mail_Address: mapping@loudoun.gov
- Hours_of_Service: 8:00-4:30 EST, M-F
- Distribution_Liability: See access and use constraints information.
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Format_Name: DXF
- Format_Specification: AutoCad Digital Exchange File
- Digital_Transfer_Option:
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- Offline_Option:
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- Offline_Media: dvd
- Fees:
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Loudoun County distributes spatial data in ArcGIS database or shapefile & DXF format for the cost of reproduction. Countywide spatial datasets may be purchased for $22 per DVD for up to 4.5 GB of data. There is a $100 surcharge to purchase countywide topography, and a $3 charge if the item is to be mailed. If the customer wants the data in DXF format and/or would like OMAGI to custom select specific geographic areas of the County, there is an additional $7 per 15 minute increment labor charge. Select aerial imagery is also available.
- Ordering_Instructions:
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Size limit: 4.5 GB. Visit our website at: <http://www.loudoun.gov/omagi>, click on "Loudoun County Mapping Documents & Order Forms." The "Forms" directory will lead you to custom & standard (countywide) data order forms. Hardcopy maps may also be available; please contact the Mapping Office Public Information Counter for more information regarding all data requests.
- Metadata_Reference_Information:
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- Metadata_Date: 20140820
- Metadata_Contact:
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- Contact_Information:
-
- Contact_Organization_Primary:
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- Contact_Organization:
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Loudoun County, VA, Office of Mapping & Geographic Information (OMAGI)
- Contact_Position: Metadata Specialist
- Contact_Address:
-
- Address_Type: mailing and physical
- Address: MS 65
- Address: 1 Harrison Street SE, 2nd Floor
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703)771-5778
- Contact_Facsimile_Telephone: (703)771-5075
- Contact_Electronic_Mail_Address: mapping@loudoun.gov
- Hours_of_Service: 8:00-4:30 EST, M-F
- Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: local time
- Metadata_Use_Constraints:
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This metadata reflects the source Geodatabase format and specific elements may not apply if your data is exported to SHP or DXF products. User must be aware that changes to data schema occur during data export that may not be reflected in this metadata, which represents Loudoun County's corporate geodatabase. Acknowledgement of Loudoun County would be appreciated in the use of this metadata.
Generated by mp version 2.9.6 on Wed Aug 20 09:09:30 2014