U.S. Department of the Interior, Bureau of Land Management (BLM) U.S. Department of Interior, Bureau of Land Management (BLM) 20220104 vector digital data Bureau of Land Management None https://blmspace.blm.doi.net/oc/intra/drs/SitePages/BLM%20National%20Area%20of%20Critical%20Enviromental%20Concern%20(ACEC).aspx https://www.wildlife.ca.gov/Data/BIOS This polygon feature class shows the spatial extent and boundaries of Areas of Critical Environmental Concern that have become officially designated by the BLM. These polygon features were previously in a pre-designated status (i.e. being considered as areas to be eventually designated as official ACEC designated polygons). Once these polygon feature left the Pre-Designated phase (transitioned from a Considered to Designated status), they were removed from the ACEC Pre-designated polygon feature class and placed in this ACEC Designated polygon feature class. This state dataset may have published a dataset that is more current than the National dataset; there may be geometry variations between the state and national dataset which may have different results. The national dataset is updated following the data standard sched This polygon feature class shows the spatial extent and boundaries of designated Areas of Critical Environmental Concern that have become officially designated by the BLM. In general, the ACEC dataset defines areas within the public lands where special management attention is required to protect and prevent irreparable damage to important historic, cultural, or scenic values, fish and wildlife resources or other natural systems or processes, or to protect life and safety from natural hazards. https://www.blm.gov/sites/blm.gov/files/uploads/mediacenter_blmpolicymanual1613.pdf https://www.ecfr.gov/current/title-43/subtitle-B/chapter-II/subchapter-A/part-1600#1610.7-2 https://www.blm.gov/sites/blm.gov/files/AboutUs_LawsandRegs_FLPMA.pdf A published revision of the Department Manual’s Part 305: Departmental Science Effects, Chapter 3: Integrity of Scientific and Scholarly Activities (305 DM 3), effective December 16, 2014, is available online at http://elips.doi.gov/ELIPS/DocView.aspx?id=4056. Scholarly information considered in Departmental decision making must be robust, of the highest quality, and the result of as rigorous scientific and scholarly processes as can be achieved. Most importantly, it must be trustworthy. This policy helps us to achieve that standard (http://www.doi.gov/scientificintegrity/index.cfm). Each state office has a Data Steward or Contact Person for this data. Please contact the specific state office for additional information on their state dataset. unknown 20211230 Unknown Complete As needed -124.474884 -113.621217 42.106695 32.478271 BLM-THEME Authorization Disturbance Endangered Geospatial Management Paleontology Recreation Vegetation Wildlife Withdrawal NONE Bureau of Land Management Cultural Fish Historic Natural Hazards Planning Resource Management Plan Scenic Value ISO 19115 Topic Categories environment biota boundaries BLM-STATE Arizona California Nevada NONE United States Western States These are data made available to the public and are considered public domain. These data contain no sensitive information which would be prevented from disclosure by Freedom of Information Act (FOIA), the Privacy Act or other laws. Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.These data are provided by BLM "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived, and both scale and accuracy may vary across the data set. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data. These data are neither legal documents nor land surveys, and must not be used as such. Official records may be referenced at most BLM offices. Please report any errors in the data to the BLM office for which it was obtained. The BLM should be cited as the data source in any products derived from these data. Any Users wishing to modify the data should describe the types of modifications they have performed. The User should not misrepresent the data, nor imply that changes made were approved or endorsed by BLM. This information may be updated without notification. BLM Mark Conley CA NCL Lead mailing and physical

2800 Cottage Way

Sacramento CA 95825 US (916) 978-4641 (916) 978-4657 mconley@blm.gov 8-5 NONE BLM California NA Unclassified NA Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270 This national dataset is an aggregation from multiple datasets provided by the BLM Administrative States, please contact the distributor for additional information on provenance, history, accuracy and quality of a particular state's data. The accuracy of attributes in this dataset reflects that of the source datasets. Attribute accuracy was tested by validating attribute coded values against accepted domain values, checking that alpha-numeric values followed a valid format, and checking that numeric values were greater than zero. This national dataset is an aggregation from multiple datasets provided by the BLM Administrative States, please contact the distributor for additional information on provenance, history, accuracy and quality of a particular state's data. The logical consistency of this dataset reflects that of the source datasets. Each source dataset is run through a series of tests to verify that the data complies with the format specified in the Data Standard. ERRORS AND INCONSISTENCIES MAY STILL BE PRESENT IN THE DATA. These tests were conducted using ESRI ArcMap 10.1. The tests consisted of checking coded values for attributes against a domain of accepted values, checking that alpha-numeric values followed a valid format, and checking that numeric values were greater than zero. For the geometry, the topology was validated; however overlaps and gaps can still be found. This national dataset is an aggregation from multiple datasets provided by the BLM Administrative States, please contact the distributor for additional information on provenance, history, accuracy and quality of a particular state's data. The completeness of this dataset reflects that of the source datasets. This national dataset is an aggregation from multiple datasets provided by the BLM Administrative States, please contact the distributor for additional information on provenance, history, accuracy and quality of a particular state's data. The positional accuracy across this dataset varies according to the source. U.S. Department of Interior, Bureau of Land Management (BLM) 20141205 Release 1-1762 http://web.blm.gov/internal/wo-500/directives/dir-hdbk/h1283-2.pdf onLine H-1283-2 Data Administration and Management Handbook This official BLM Data Management handbook contains information about how data is administered, managed, and tracked. This handbook discusses how the BLM operates with regard to data development and design, quality, metadata, and business rules. The information this resource contains also pertains to geospatial data. Using the implementation guidelines, GIS staff at BLM field and state offices cross-walk and clean up their data to comply with the standardized national dataset. Then, the BLM field and/or state offices submit the data to the National Operations Center (NOC), where it is compiled to produce seamless national datasets. This process of data replication to the National Operations Center is intended to occur on a monthly basis. 20170427 BLM National Operations Center Spatial Data Coordinator Spatial Data Coordinator physical

Bldg. 50, Denver Federal Center

Denver CO 80225 US (303)236-5445 (303)236-3508 scrowe@blm.gov Vector GT-polygon composed of chains 234 NAD 1983 California Teale Albers 34.0 40.5 -120.0 0.0 0.0 -4000000.0 coordinate pair 0.0001 0.0001 meter D North American 1983 GRS 1980 6378137.0 298.257222101 ds2631 BLM Designated Areas of Critical Environmental Concern Polygons Areas of Critical Environmental Concern (ACEC) Implementation Guidelines ADMIN_ST An administrative unit that identifies the state or geographic area which has administrative jurisdiction over lands, and cases. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines DOM_ADMIN_ST Areas of Critical Environmental Concern (ACEC) Implementation Guidelines OBJECTID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. ACEC_NAME The name of the ACEC taken from the Record of Decision and Land Use Plan which officially designated the ACEC. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines CASEFILE_NO The number that refers to the serialized case file number of the group of official documents that record the facts, or actions taken, on a specific application, such as an oil and gas lease, exchange, airport lease, easement acquisition, etc. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines ACEC_EST_ACR The measure of the area estimated in the designation process for land use planning. This is the designated size (acres) and may be different than the actual area. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines GIS_ACRES This is a calculated value of area in units of acres based on the area field created by default within the ESRI Polygon data structure. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines LOC_ACEC_ID The current identifier that was used by a state or field office to identify an ACEC at the state or field office level. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines SHAPE Feature geometry. Esri Coordinates defining the features. ACEC_ID The designed primary key that will uniquely identify a single occurrence of the entity. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines GlobalID Software generated value. A field of type UUID (Universal Unique Identifier) in which values are automatically assigned by the geodatabase when a row is created. This field is not editable and is automatically populated when it is added for existing data. This attribute is included for purposes of replication only. It is not used as a unique identifier for relationships between feature classes/tables. Esri LUP_NAME The name given to a project that represents the full, official name associated with the project. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines ADM_OFC_CD BLM administrative office (which is subordinate to the state office) that has jurisdiction and/or management authority over lands within a geographic area. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines SENSITIVITY A code that designates the sensitivity of the information on the ACEC. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines ACEC_ DOM_SEN_CODE Areas of Critical Environmental Concern (ACEC) Implementation Guidelines COMMENTS The text that provides additional information about the Area of Critical Environmental Concern. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines ADM_UNIT_CD The BLM administrative unit/office that is a combination of Administrative State Code and Administrative Office Code that fully identifies the geographic area which has jurisdiction over the lands. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines DOM_ADM_UNIT_CD Areas of Critical Environmental Concern (ACEC) Implementation Guidelines ROD_DATE The date on which the decision is signed by the person who has approval authority for the decisions. Areas of Critical Environmental Concern (ACEC) Implementation Guidelines Shape_Length Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Area Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. See the Areas of Critical Environmental Concern (ACEC) Implementation Guidelines. BLM Russell Slatton State Data Administrator mailing and physical

2800 Cottage Way

Sacramento CA 95825 US (916) 978-4365 (916) 978-4327 rslatton@blm.gov 8-5 NONE Designated Areas of Critical Environmental Concern Polygons The BLM assumes no responsibility for errors or omissions. No warranty is made by the BLM as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data; nor shall the act of distribution to contractors, partners, or beyond, constitute any such warranty for individual or aggregate data use with other data. Although these data have been processed successfully on computers of BLM, no warranty, expressed or implied, is made by BLM regarding the use of these data on any other system, or for general or scientific purposes, nor does the fact of distribution constitute or imply any such warranty. In no event shall the BLM have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the use or reliance on the geographic data or arising out of the delivery, installation, operation, or support by BLM. File Geodatabase www.navigator.blm.gov Designated Areas of Critical Environmental Concern Polygons 20170420 20220720 20220103 BLM Russell Slatton State Data Administrator mailing and physical

2800 Cottage Way

Sacramento CA 95825 US (916) 978-4365 (916) 978-4327 rslatton@blm.gov 8-5 NONE FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time