Description: This feature class is an extract of EPA's Facility Registry Service (FRS), based on selecting the INTEREST_TYPE for Brownfields and Superfund sites. The Facility Registry Service (FRS) integrates facility information from several different national and state information systems. Accidents, spills, leaks, and past improper disposal and handling of hazardous materials and wastes have resulted in tens of thousands of sites across our country that have contaminated our land, water (groundwater and surface water), and air (indoor and outdoor). EPA and its state, territory and tribal partners have developed a variety of cleanup programs to assess and, where necessary, clean up these contaminated sites.Brownfields are real properties, the expansion, redevelopment, or reuse of which may be complicated by the presence or potential presence of a hazardous substance, pollutant, or contaminant. Cleaning up and reinvesting in these properties takes development pressures off of undeveloped, open land, and both improves and protects the environment. CIMC provides information on Brownfields properties for which information is reported back to EPA, as well as areas served by Brownfields grants programs. Brownfields properties may be mapped or listed, and property profiles can be accessed from either maps or lists. There are many properties that meet the definition of a brownfield but are not funded by our program.Superfund is a program administered by the EPA to locate, investigate, and clean up the worst hazardous waste sites throughout the United States. EPA administers the Superfund program in cooperation with individual states and tribal governments. These sites include abandoned warehouses, manufacturing facilities, processing plants, and landfills - the key word here being abandoned.
Description: This dataset contains dams, headwalls, floodwalls, bulkheads, canals, water cooling channels, drainage connectors, and single line streams within Prince George's County. Canals, water cooling channels, and streams that run below elevated structures or underground are shown with a hidden feature code. Single line streams are those that are less than 20 feet in width. Centerlines of streams greater than 20 feet in width are shown with a separate feature code. Dams in this layer include those smaller ones found in creeks. This data was captured for use in general mapping at a scale of 1:1200.
Description: This feature class describes Prince George's County's Environmental Strategy Areas (ESAs), which guide stream and wetland buffer requirements. Areas 1, 2, and 3 coincide with the 2002 General Plan Tiers, where ESA 1 is the Developed Tier, ESA 2 is the Developing Tier, and ESA 3 is the Rural Tier. ESA 4 is the Chesapeake Bay Critical Area Overlay Zone (CBCA). ESA 4 is further subdivided into three CBCA zones -- Resource Conservation, Limited Development, and Intense Development -- which also have implications for stream buffer requirements.
Description: The floodplain boundary line feature class represents the 100-yr floodplain boundary delineation based on the floodplain studies done by private consultants and DoE. Boundary lines were digitized based on a hierarchy decision tree in relation to the source documentation and mapping available. 1. The 100-yr floodplain boundary was digitized from floodplain mapping that was georeferenced using grid coordinate marks and / or aerial imagery features. If the 100-yr floodplain boundary was clearly delineated on the mapping, the GIS feature was digitized from the georeferenced mapping.2. If the 100-yr floodplain boundary was not clearly indicated on the mapping and floodplain cross sections existed indicating the elevation of the 100-yr floodplain boundary, the floodplain boundary was digitized using 2-foot elevation contours and extrapolated between cross sections, crossing at the intersection of the cross section and associated contour.3. If the 100-yr floodplain boundary and cross sections were not identified from the mapping, the floodplain boundary for these segments was digitized between the known upstream and downstream floodplain boundary elevation from adjacent floodplain studiesThe following is a list of table fields and descriptions for the floodplain boundary line feature class:FPS_NUM – floodplain study number issued by CountyPLANDATE – date of the approved floodplain study COMMENTS – additional comments related to the floodplain study or digitization process
Description: The Floodplain_DOE_Partial_Py feature class is a portion of the floodplain delineation based on the watershed studies using ultimate land-use conditions and therefore usually extends beyond the FEMA floodplain which is based on existing land-use conditions. The studies were either conducted by or for the Storm Water Management Technical Group, originally a multi-agency technical group (doing hydrologic and hydraulic watershed studies). Salman (DPIE) compares floodplains (FEMA , SWMTG or other private study) and determines which one is higher and therefore governs which becomes the regulatory floodplain. This can vary within a watershed, for any specific case, the final regulatory floodplain determination lies with DPIE. This feature class is incomplete, missing several floodplain studies and is intended for internal analysis only and is not to be distributed.For more information, contact Michael J. Colgan, Water Resources Engineer, Prince George's County Departmnet of the Environment, 301-883-5944, mjcolgan@co.pg.md.us or Catherine R. Escarpeta, GISP, GIS Analyst, Prince George’s County Department of the Environment, 301.883.5990, crescarpeta@co.pg.md.us.
Description: The National Flood Hazard Layer (NFHL) data incorporates all Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis. The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The FIRM Database is derived from Flood Insurance Studies (FISs), previously published FIRMs, flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by FEMA. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all FIRM Databases and corresponding LOMRs available on the publication date of the data set. The specification for the horizontal control of FIRM Databases is consistent with those required for mapping at a scale of 1:12,000. This file is georeferenced to the Earth's surface using the Geographic Coordinate System (GCS) and North American Datum of 1983.Flood hazard areas identified on the Flood Insurance Rate Map are identified as a Special Flood Hazard Area (SFHA). SFHA are defined as the area that will be inundated by the flood event having a 1-percent chance of being equaled or exceeded in any given year. The 1-percent annual chance flood is also referred to as the base flood or 100-year flood. SFHAs are labeled as Zone A, Zone AO, Zone AH, Zones A1-A30, Zone AE, Zone A99, Zone AR, Zone AR/AE, Zone AR/AO, Zone AR/A1-A30, Zone AR/A, Zone V, Zone VE, and Zones V1-V30. Moderate flood hazard areas, labeled Zone B or Zone X (shaded) are also shown on the FIRM, and are the areas between the limits of the base flood and the 0.2-percent-annual-chance (or 500-year) flood. The areas of minimal flood hazard, which are the areas outside the SFHA and higher than the elevation of the 0.2-percent-annual-chance flood, are labeled Zone C or Zone X (unshaded).
Description: This dataset contains impervious surfaces within Prince George's County. Impervious surfaces are attributed by type. All remaining surfaces that do not fall under one of the 'Type' categories are classified as pervious. Impervious Surface features derived as a byproduct of the photogrammetric capture of planimetric features, for use in general mapping at a scale of 1:1200, using stereo imagery taken to satisfy creation of 6 inch ground pixel resolution orthophotography. The original data was developed using photography taken from March of 2009. It was then updated in 2014 using photography taken during March/April of 2014.
Name: Mount Vernon Viewshed Area of Primary Concern
Display Field: EXIST
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: The Area of Primary Concern represents an area potentially visible from George Washington's Mount Vernon Estate (East Lawn), with the removal of forest cover and construction of buildings 36 feet high. The original analysis was performed by EDAW, Inc. in 1991 using GIS visual simulation, and was adjusted in 2007 by Michael G. Clarke, AICP using ArcView and 1:24,000 USGS topographic maps, enhanced by National Geographic (TOPO series). The accuracy of the Area of Primary Concern diminishes as the distance increases from Mt. Vernon. Field verification is required to confirm whether specific locations are within Mt. Vernon's viewshed.
Copyright Text: Michael G. Clarke, AICP
clarke@hughes.net
518.523.8224
Name: Potential Forested Interior Dwelling Specie (DNR)
Display Field: STREAM
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Potential habitat layer for Forest Interior Dwelling Species in the State of Maryland. These data are only the results of a model depicting where FIDS habitat might occur based on certain criteria. These polygons have NOT been field tested or field verified for actual FIDS presence. Please reference GIS documentation for further geospatial details for FIDS.
Copyright Text: Maryland Department of Natural Resources, Wildlife and Heritage Service, Towson University, Center for GIS
Description: The statewide vector file shows buffered areas that primarily contain habitat for rare, threatened, and endangered species and rare natural community types. It was created over USGS 7.5 minute topographic quadrangle maps and it generally includes, but does not specifically delineate, such regulated areas as Natural Heritage Areas, Wetlands of Special State Concern, Colonial Waterbird Colonies, and Habitat Protection Areas. Version 1 also included Waterfowl Concentration and Staging Areas, but these areas have not been included in subsequent versions. The file is best displayed by the "Group" attribute.
Description: This file contains the results of multiple analyses for conserving watersheds that are important for the conservation of freshwater aquiatic biodiversity in Maryland. In 2005, MBSS and NHP analyzed watershed-level data to determine stronghold watersheds for individual rare, threatened or endangered freshwater aquatic species. In 2006, NHP analyzed watershed-level data to determine stronghold watesheds based on species richness and rarity-weighted richness. In 2007, strongholds for stream-related amphibians and reptiles were included. ** The Maryland-National Capital Park and Planning Commission, Countywide Planning Division, Prince George's County Planning Department, Special Projects Section has edited the original data so that it only encompasses Prince George's County.
Description: This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. A special soil features layer (point and line features) is optional. This layer displays the location of features too small to delineate at the mapping scale, but they are large enough and contrasting enough to significantly influence use and management. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties.This data set has been customized for use by the M-NCPPC, Prince George's County Planning Department as follows: the Soil Data Viewer ArcMap extension was used to symbolize soil mapunit data for each of the following categories: Drainage Class, Hydric Rating, Hydologic Soil Group, K-factor (whole soil), and Mapunit name. Each data sets symbology, produced by the Soil Data Viewer, was saved as a layer and each data table was joined to the data set for Mapunit name, using MUKEY as the join field. The layer files were repointed to this combined data set and more descriptive items were included in the layer file where appropriate.
Description: The Clean Water Act requires three components to water quality standards that set goals for and protect each States' waters. The three components are: (1) designated uses that set goals for each water body (e.g., recreational use), (2) criteria that set the minimum conditions to support the use (e.g., bacterial concentrations below certain concentrations) and (3) an antidegradation policy that maintains high quality waters so they are not allowed to degrade to meet only the minimum standards. The designated uses and criteria set the minimum standards for Tier I. Maryland's antidegradation policy has been promulgated in three regulations: COMAR 26.08.02.04 sets out the policy itself, COMAR 26.08.02.04-1, which is discussed here, provides for implementation of Tier II (high quality waters) of the antidegradation policy, and COMAR 26.08.02.04-2 that describes Tier III (Outstanding National Resource Waters or ONRW), the highest quality waters. No Tier III waters have been designated at this time. Tier II antidegradation implementation has the greatest immediate effect on local government planning functions so MDE has prepared this set of Tier II GIS data layers to provide technical assistance to local governments working to complete the Water Resources Element of their comprehensive plans as required by HB 1141. As part of this process, MDE has created a catchment dataset representing the general land area that can directly affect that Tier II stream's segment water quality via run off. The publicly maintained list of all Tier II waters and for further information regarding Maryland's High Quality Waters, Tier II, please visit http://www.mde.state.md.us/ResearchCenter/Data/waterQualityStandards/Antidegradation/index.asp
Copyright Text: The Maryland Department of the Environment Science Services Administration would like to acknowledge the Maryland Department of Natural Resources' MANTA Division, Maryland Biological Stream Survey Program for providing biological stream sampling station data as well as the associated geospatial information. MDE would also like to acknowledge the U.S.G.S. for their 24,000:1 scale National Hydrography Dataset which was used during the development of this line file.
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Description: The Clean Water Act requires three components to water quality standards that set goals for and protect each States' waters. The three components are: (1) designated uses that set goals for each water body (e.g., recreational use), (2) criteria that set the minimum conditions to support the use (e.g., bacterial concentrations below certain concentrations) and (3) an antidegradation policy that maintains high quality waters so they are not allowed to degrade to meet only the minimum standards. The designated uses and criteria set the minimum standards for Tier I. Maryland's antidegradation policy has been promulgated in three regulations within the Code of Maryland Regulations (COMAR): COMAR 26.08.02.04 sets out the policy itself, COMAR 26.08.02.04-1, which is discussed here, provides for implementation of Tier II (high quality waters) of the antidegradation policy, and COMAR 26.08.02.04-2 that describes Tier III (Outstanding National Resource Waters or ONRW), the highest quality waters. No Tier III waters have been designated at this time. Tier II antidegradation implementation has the greatest immediate effect on local government planning functions so the Maryland Department of the Environment (MDE) has prepared this set of Tier II GIS data layers to provide technical assistance to local governments working to complete the Water Resources Element of their comprehensive plans as required by HB 1141. As part of this process, MDE has created this dataset representing the official record of all Maryland Tier II (high quality) stream segments as determined by MDE, the regulatory agency responsible for identification and listing of Maryland's Tier II waters. This dataset consists of a digital geospatial representation of all identified Tier II segments which includes those stream segments promulgated in (COMAR) 26.08.02.04-1, and those additional segments proposed during the current Triennial Review of Maryland Regulations, known as the pending list. Pending segments are Tier II segments awaiting promulgation. This is a vector line file that was developed using the 24,000:1 scale National Hydrography Dataset (NHD) coverage for Maryland, and each identified Tier II stream segment has been linked to the NHD using the unique common identifier (COMID) code. MDE uses Maryland Biological Stream Survey (MBSS) data for designating streams as Tier II. Using all MBSS stations sampled within a stream reach (defined as a section of stream from confluence to confluence), an arithmetic mean of the benthic index of biotic integrity (IBI) and the fish IBI is calculated. Only if the means of both the benthic and fish IBIs are greater than or equal to 4.00 is a stream reach designated as Tier II. As such, Tier II streams represent the best streams in Maryland in terms of water quality, water chemistry, habitat, and biotic assemblages. Tier II stream segments can range in length generally terminating at confluences, impoundment outfalls, and tidal boundaries. However, in planning activities, one should consider the entire upstream watershed to a Tier II stream as any changes to this watershed can potentially have an effect on the water quality of the Tier II stream. It is worth noting that once a stream segment is designated as Tier II, this designation lasts in perpetuity regardless of changes in water quality or local landuse. The publicly maintained list of all Tier II waters and for further information regarding Maryland's High Quality Waters, Tier II, please visit http://www.mde.state.md.us/ResearchCenter/Data/waterQualityStandards/Antidegradation/index.asp
Copyright Text: The Maryland Department of the Environment Science Services Administration would like to acknowledge the Maryland Department of Natural Resources' MANTA Division, Maryland Biological Stream Survey Program for providing biological stream data as well as the associated geospatial information. MDE would also like to acknowledge the U.S.G.S. for their 24,000:1 scale National Hydrography Dataset which was used during the development of this line file.
Description: This dataset contains woodlands greater than 5000 square feet or one tenth of an acre within Prince George's County. The dripline of wooded areas was captured so it may run through other features. This data was captured for use in general mapping at a scale of 1:1200.
Description: This file is a statewide digital watershed file. It was created primarily for state and federal agency use. The watersheds define Strahler (Strahler 1952 p. 1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watersheds drainage areas were defined for streams less than third order and some large area watershed were split to maintain a maximum size of 15,000 acres. The watershed boundaries in this file were developed in a joint state and federal effort to create a consistent watershed file for use by all government agencies with an interest in Maryland's watersheds. The U.S. Natural Resources Conservation Service (NRCS) redefined the third order watersheds creating the HUA14 file. This file contains all of the HUA14 watersheds and some added watersheds to maintain water quality sampling sites. It was also used to create the Maryland Sub-Watershed file.
Copyright Text: The original eight digit watershed file was created in 1991 from Maryland Department of the Environment (MDE) hardcopy watershed maps. The Maryland Office of Planning (OP) created that digital file by contracting with Daft, McCune and Walker to digitize third order stream watersheds. The U.S. Natural Resources Conservation Service (NRCS) produced the Hydrological Unit Code watershed file HUA14 using the OP file as a base map and redefining watersheds. NCRS field offices verified the watershed boundaries. The Maryland Department of Housing and Community Development Maryland Historic Trust (MHT) provided scanned US Geological Survey (USGS) 7.5 minute quadrangle map sheets to be used as a base map for corrections. The Department of Natural Resources (DNR) corrected the watershed boundaries to the scanned USGS 7.5 minute quadrangle map sheets in cooperation with NRCS. The State political boundary file from Maryland State Highway Administration's (SHA) GRID map series was merged into the file replacing the existing state line. The merge and watershed corrections were completed by DNR.
Name: Wetland of Special State Concern - Line (DNR)
Display Field: CLASS1
Type: Feature Layer
Geometry Type: esriGeometryPolyline
Description: In Maryland certain wetlands with rare, threatened, endangered species or unique habitat receive special attention. The Code of Maryland Regulations (COMAR) Title 26, Subtitle 23, Chapter 06, Sections 01 & 02 identifies these Wetlands of Special State Concern (WSSC) and affords them certain protections including a 100 foot buffer from development. The Maryland Department of the Environment is responsible for identifying and regulating these wetlands. In general, the US Fish and Wildlife Service's National Wetlands Inventory wetlands provide the basis for identifying these special wetlands. Additional information, determined from field inspections, is used to identify and classify these areas.
Copyright Text: Lynn Davidson with DNR's Forest, Wildlife and Heritage unit provided the source material, provided guidance and performed the final quality control review. Kevin Boone with DNR's Chesapeake and Coastal Watershed Service performed all data creation and correction functions. The Maryland Department of the Environment's Nontidal Wetlands and Waterways Division established and maintains the official list of Wetlands of Special State Concern.
Name: Wetland of Special State Concern - Poly (DNR)
Display Field: CLASS1
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: In Maryland certain wetlands with rare, threatened, endangered species or unique habitat receive special attention. The Code of Maryland Regulations (COMAR) Title 26, Subtitle 23, Chapter 06, Sections 01 & 02 identifies these Wetlands of Special State Concern (WSSC) and affords them certain protections including a 100 foot buffer from development. The Maryland Department of the Environment is responsible for identifying and regulating these wetlands. In general, the US Fish and Wildlife Service's National Wetlands Inventory wetlands provide the basis for identifying these special wetlands. Additional information, determined from field inspections, is used to identify and classify these areas.
Copyright Text: Lynn Davidson with DNR's Forest, Wildlife and Heritage unit provided the source material, provided guidance and performed the final quality control review. Kevin Boone with DNR's Chesapeake and Coastal Watershed Service performed all data creation and correction functions. The Maryland Department of the Environment's Nontidal Wetlands and Waterways Division established and maintains the official list of Wetlands of Special State Concern.
Description: Woodland Conservation Areas (WCA) are captured to support the annual reporting of the State Forest Conservation Act 0f 1991 by further delineating certain conservation easements into distinct planted, retained, and floodplain areas. The source information for each WCA shape is found on approved Type Two Tree Conservation Plans (TCP II), approved by the Prince George’s County Planning Department, for each fiscal year, beginning in 2009.