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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. 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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 \u2013 floodplain study number issued by CountyPLANDATE \u2013 date of the approved floodplain study COMMENTS \u2013 additional comments related to the floodplain study or digitization process", "geometryType": "esriGeometryPolyline", "sourceSpatialReference": { "wkid": 103069, "latestWkid": 6488 }, "copyrightText": "", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "drawingInfo": { "renderer": { "type": "simple", "symbol": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 0, 0, 255 ], "width": 1.5 }, "label": "", "description": "" }, "transparency": 0, "labelingInfo": null }, "defaultVisibility": false, "extent": { "xmin": 1294294.22638823, "ymin": 324786.903828472, "xmax": 1405793.52668315, "ymax": 528827.987215295, "spatialReference": { "wkid": 103069, "latestWkid": 6488 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeAsHTMLText", "displayField": "COMMENTS", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": [ { "name": "OBJECTID", "type": "esriFieldTypeOID", "alias": "OBJECTID", "domain": null }, { "name": "FPS_NUM", "type": "esriFieldTypeString", "alias": "FPS_NUM", "length": 15, "domain": null }, { "name": "COMMENTS", "type": "esriFieldTypeString", "alias": "COMMENTS", "length": 250, "domain": null }, { "name": "PLANDATE", "type": "esriFieldTypeDate", "alias": "PLANDATE", "length": 8, "domain": null }, { "name": "SHAPE", "type": "esriFieldTypeGeometry", "alias": "SHAPE", "domain": null }, { "name": "SHAPE.LEN", "type": "esriFieldTypeDouble", "alias": "SHAPE.LEN", "domain": null } ], "geometryField": { "name": "SHAPE", "type": "esriFieldTypeGeometry", "alias": "SHAPE" }, "indexes": [ { "name": "R154_SDE_ROWID_UK", "fields": "OBJECTID", "isAscending": true, "isUnique": true, "description": "" }, { "name": "A127_IX1", "fields": "SHAPE", "isAscending": true, "isUnique": true, "description": "" } ], "subtypes": [], "relationships": [], "canModifyLayer": false, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Map,Query,Data", "maxRecordCount": 1000, "supportsStatistics": true, "supportsAdvancedQueries": true, "supportedQueryFormats": "JSON, geoJSON", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": true, "supportsHavingClause": true, "supportsCountDistinct": true, "supportsOrderBy": true, "supportsDistinct": true, "supportsPagination": true, "supportsTrueCurve": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": true }, "supportsDatumTransformation": true, "dateFieldsTimeReference": null, "supportsCoordinatesQuantization": true }, { "currentVersion": 10.81, "id": 31, "name": "Floodplain (DPIE)", "type": "Feature Layer", "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. 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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. 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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. 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