Limstone Overlay District (LOD) of Loudoun County, VA (2010)

Loudoun County, Virginia, Department of Building and Development 22Feb10 Limstone Overlay District (LOD) of Loudoun County, VA (2010) vector digital data Leesburg, VA Loudoun County, VA withheld GISDBB.GISBROW.LIMESTONE_OD_POLY The Limestone Overlay District (LOD) is a zoning overlay district adopted by the Loudoun County Board of Supervisors on 2/17/2010 and administered by the Loudoun County Department of Building and Development. The Department is responsible for all development approvals, review procedures, modifications and density calculations in the LOD as governed by Article VI, "Development Process and Administration", of the Revised 1993 Zoning Ordinance, and procedures in Chapter 8 of the Facilities Standards manual. The LOD is generally comprised of the following geologic formations: Cf-Frederick Limestone, Ct-Tomstown Dolomite, JTRc-Catharpin Creek Formation, JTRcg-Catharpin Creek Formation Goose Creek Member, TRbl-Balls Bluff Siltstone Leesburg Member, and TRbs-Balls Bluff Siltstone Fluvial and Deltaic Sandstone Member. The geographic area of the Limestone Overlay District (LOD) is generally east from the Catoctin Mountain Range to the Potomac River (excludes Lost Corner), and from just south of the Town of Leesburg north to Point of Rocks, MD (excludes the Town of Leesburg.) The land area delineated by the boundaries of the LOD is comprised of limestone and "Karst terrain" areas. The terrain is also characterized by the presence of certain natural features, such as sinkholes and rock outcrops. Thus, development on Karst terrain has a direct correlation to the potential for collapse and ground slippage and the susceptibility of groundwater and surface water pollution, and spring contamination, posing serious risks to public health, safety and welfare. The provisions of Section 4-1900 of the Revised 1993 Zoning Ordinance are intended to regulate land use and development in areas underlain by limestone and in areas with Karst features and terrain as shown on the official Limestone Overlay District Map of Loudoun County. Data are stored in the corporate ArcSDE Geodatabase as a polygon feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN. en Feb 2010 publication date Complete As needed -77.605567 -77.491952 39.267440 39.075966 11736836.366458 11768330.724167 7076464.950625 7145883.329167 none limestone geology conglomerate zoning overlay environment sinkholes karst bedrock ESRI ArcIMS Topic Categories geoscientificInformation environment health boundaries none Virginia Loudoun County None 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. Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user. Loudoun County, VA, Department of Building and Development Public Information Counter physical address

1 Harrison Street SE, 2nd Floor

Leesburg VA 20175 USA

Mail stop 60

(703)777-0397 (703)771-5522 bad@loudoun.gov 8:00-5:00 EST, M-F Limstone Overlay District is based on both field work by the County Soil Scientist and USGS's geology layer of Loudoun County. Public Information ESRI ArcCatalog 9.3.1.4000 Feature Class 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. US Geological Survey 1993 Digital Geologic Map vector digital data The geology of Loudoun County, Virginia, was mapped from 1988 through 1991 under a cooperative agreement between the U.S. Geological Survey (USGS) and the Loudoun County Department of Environmental Resources. This geologic map was compiled in 1993 from a series of detailed published and unpublished field investigations at scales of 1:12,000 and 1:24,000. Some of these same data were compiled as a digital geologic map at 1:100,000 scale (Burton and others, 1992a) and were the basis for a cost-benefit analysis of the societal value of geologic maps (Bernknopf and others, 1993). 12000 - 24000 CD-ROM 1993 Cooperative agreement between USGS and Loudoun County Dept. of Natural Resources to map geology provided source data set for extraction of Limestone Conglomerate. Loudoun County Board of Supervisors 20020109 Loudoun County General Plan CD-ROM 2002 Extracted Limestone Conglomerate as a Zoning Overlay District Loudoun County Board of Supervisors January 2003 Limestone Conglomerate Overlay District (LCOD) map NOTE: The Circuit Court of Loudoun County issued an opinion dated March 30, 2004 ruling that the LCOD is void. The March 30, 2004 decision may be the subject of an appeal. 1:2400 disc LCOD The Limestone data was originally created in 1991. The extent of the district was re-defined in 2002 for purposes of creating an overlay district as part of the Revised General Plan in 2003. 2002 Loudoun County, VA, Building & Development Soil Scientist or GIS Administrator 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 conversion 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 HARN83 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 The dataset was then converted to a feature class in a geodatabase in ArcSDE. 2004 Loudoun County, VA, Office of Mapping and Geographic Information (OMAGI) GIS System Analyst A 200' buffer was added to the western edge of the largest feature. The two smaller features, to the nothwest, received 200' buffers around the entire feature. Several donut holes were removed/filled in on the largest feature. Areas outside of County jurisdiction, such as the Town of Leesburg, were removed. December 2008 Loudoun County Vector Simple FALSE 2 TRUE FALSE coordinate pair 0.000208 0.000208 survey feet D_North_American_1983_HARN Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983_HARN NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet Not Applicable 1.000000 Not Applicable Explicit elevation coordinate included with horizontal coordinates LIMESTONE_OD_POLY Polygon Feature Class ESRI Feature Class 2 OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. OBJECTID OID 4 0 0 LI_MAP_UNIT Limestone Map Unit USGS It's either in or out. The value LIMEST doesn't mean much and the "null" value is a hole...... LI_MAP_UNIT String 6 0 0 LI_UPD_DATE Date feature class created or modified Loudoun County User generated text LI_UPD_DATE Date 8 0 0 LI_UPD_SOURCE Source that created or edited feature class Loudoun County See Overview Description for data dictionary of attribute LI_UPD_SOURCE SmallInteger 2 0 0 LI_UPD_USER Not for public distribution. Internal User ID of editor creating or modifying a feature. Loudoun County LI_UPD_USER SmallInteger 2 0 0 SHAPE Feature geometry. ESRI Coordinates defining the features. Shape Geometry 0 0 0 SHAPE_Length SHAPE_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. SHAPE_Area SHAPE_Area Double 8 0 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. LI_UPD_SOURCE: Source that created or edited feature class Source Description 0 Unknown 1 Legacy 2 County 3 Contract Loudoun County, VA, OMAGI Public Information Counter mailing and physical address

1 Harrison Street, S.E., 2nd Floor

MS 65

Leesburg VA 20175 USA (703)771-5778 (703)771-5075 mapping@loudoun.gov 8:00-4:30 EST, M-F Downloadable Data Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user. In no way will Loudoun County be liable to you or any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data. GDB ESRI Geodatabase Feature Class DVD SHP ESRI Shapefile DVD DXF AutoCad Digital Exchange File DVD 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. 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. 20111221 mailing and physical address

1 Harrison Street S.E., 2nd Floor

MS 65

Leesburg. VA 20175 USA (703)771-5778 (703)771-5075 mapping@loudoun.gov Monday - Friday 8:00 - 4:30 EST Loudoun County, VA, OMAGI Metadata Specialist FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time This metadata reflects the source Geodatabase format and specific elements may not apply if your data is exported to SHP, DXF, or .e00 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. en 20140804 20122200 FALSE 20210115 13363400 20210115 13363400 LIMESTONE_OD_POLY 002 11736836.366458 11768330.724167 7076464.950625 7145883.329167 1 Projected GCS_North_American_1983_HARN Linear Unit: Foot_US (0.304801) NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.7'><WKT>PROJCS["NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet",GEOGCS["GCS_North_American_1983_HARN",DATUM["D_North_American_1983_HARN",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",11482916.66666666],PARAMETER["False_Northing",6561666.666666666],PARAMETER["Central_Meridian",-78.5],PARAMETER["Standard_Parallel_1",38.03333333333333],PARAMETER["Standard_Parallel_2",39.2],PARAMETER["Latitude_Of_Origin",37.66666666666666],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2924]]</WKT><XOrigin>-110512499.99999979</XOrigin><YOrigin>-88857999.999999836</YOrigin><XYScale>4800.0000000000082</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.0033333333333333275</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>2924</WKID><LatestWKID>2924</LatestWKID></ProjectedCoordinateSystem> FGDC 1.0 Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.1.11595 Limstone Overlay District (LOD) of Loudoun County, VA (2010) vector digital data 2010-02-08T00:00:00 Loudoun County, Virginia, Department of Building and Development 11736836.366458 11768330.724167 7145883.329167 7076464.950625 1 -77.605567 -77.491952 39.26744 39.075966 1 1 -77.605567 -77.491952 39.267440 39.075966 The land area delineated by the boundaries of the LOD is comprised of limestone and "Karst terrain" areas. The terrain is also characterized by the presence of certain natural features, such as sinkholes and rock outcrops. Thus, development on Karst terrain has a direct correlation to the potential for collapse and ground slippage and the susceptibility of groundwater and surface water pollution, and spring contamination, posing serious risks to public health, safety and welfare. The provisions of Section 4-1900 of the Revised 1993 Zoning Ordinance are intended to regulate land use and development in areas underlain by limestone and in areas with Karst features and terrain as shown on the official Limestone Overlay District Map of Loudoun County. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Limestone Overlay District (LOD) is a zoning overlay district adopted by the Loudoun County Board of Supervisors on 2/17/2010 and administered by the Loudoun County Department of Building and Development. The Department is responsible for all development approvals, review procedures, modifications and density calculations in the LOD as governed by Article VI, "Development Process and Administration", of the Revised 1993 Zoning Ordinance, and procedures in Chapter 8 of the Facilities Standards manual. The LOD is generally comprised of the following geologic formations: Cf-Frederick Limestone, Ct-Tomstown Dolomite, JTRc-Catharpin Creek Formation, JTRcg-Catharpin Creek Formation Goose Creek Member, TRbl-Balls Bluff Siltstone Leesburg Member, and TRbs-Balls Bluff Siltstone Fluvial and Deltaic Sandstone Member. The geographic area of the Limestone Overlay District (LOD) is generally east from the Catoctin Mountain Range to the Potomac River (excludes Lost Corner), and from just south of the Town of Leesburg north to Point of Rocks, MD (excludes the Town of Leesburg.)</SPAN></P></DIV></DIV></DIV> Limstone Overlay District is based on both field work by the County Soil Scientist and USGS's geology layer of Loudoun County. limestone geology conglomerate zoning overlay environment sinkholes karst bedrock geoscientificInformation environment health boundaries 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. Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user. none; Employee generated limestone, geology, conglomerate, overlay, environment, sinkholes, karst, bedrock none; Employee generated Virginia, Loudoun, County Loudoun County, VA, Department of Building and Development Public Information Counter 1 Harrison Street SE, 2nd Floor Leesburg VA 20175 bad@loudoun.gov MS 60 (703)777-0397 (703)771-5522 8:00-5:00 EST, M-F ArcGIS Metadata 1.0 dataset Tiles GDB ESRI Geodatabase Feature Class Loudoun County, VA, OMAGI Public Information Counter 1 Harrison Street, S.E., 2nd Floor Leesburg VA 20175 mapping@loudoun.gov MS 65 (703)771-5778 (703)771-5075 8:00-4:30 EST, M-F SHP ESRI Shapefile DXF AutoCad Digital Exchange File File Geodatabase Feature Class NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet EPSG 8.9.3(9.0.0) 2 20210115 Loudoun County, VA, OMAGI Metadata Specialist Cooperative agreement between USGS and Loudoun County Dept. of Natural Resources to map geology provided source data set for extraction of Limestone Conglomerate. Digital Geologic Map 1993-01-04T00:00:00 The geology of Loudoun County, Virginia, was mapped from 1988 through 1991 under a cooperative agreement between the U.S. Geological Survey (USGS) and the Loudoun County Department of Environmental Resources. This geologic map was compiled in 1993 from a series of detailed published and unpublished field investigations at scales of 1:12,000 and 1:24,000. Some of these same data were compiled as a digital geologic map at 1:100,000 scale (Burton and others, 1992a) and were the basis for a cost-benefit analysis of the societal value of geologic maps (Bernknopf and others, 1993). US Geological Survey The Limestone data was originally created in 1991. The extent of the district was re-defined in 2002 for purposes of creating an overlay district as part of the Revised General Plan in 2003. 2002-02-04T00:00:00 Loudoun County, VA, Building & Development Soil Scientist or GIS Administrator Extracted Limestone Conglomerate as a Zoning Overlay District Loudoun County General Plan 2002-01-09T00:00:00 Loudoun County Board of Supervisors NOTE: The Circuit Court of Loudoun County issued an opinion dated March 30, 2004 ruling that the LCOD is void. The March 30, 2004 decision may be the subject of an appeal. 2400 Limestone Conglomerate Overlay District (LCOD) 2003-01-06T00:00:00 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 conversion 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 HARN83 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 The dataset was then converted to a feature class in a geodatabase in ArcSDE. 2004-01-05T00:00:00 Loudoun County, VA, Office of Mapping and Geographic Information (OMAGI) GIS System Analyst A 200' buffer was added to the western edge of the largest feature. The two smaller features, to the nothwest, received 200' buffers around the entire feature. Several donut holes were removed/filled in on the largest feature. Areas outside of County jurisdiction, such as the Town of Leesburg, were removed. 2008-01-07T00:00:00