This feature layer shows sampling sites for water quality data assessed in the Nevada 2020-2022 Water Quality Integrated Report. For more information, please visit https://ndep.nv.gov/uploads/water-wqm-docs/IR2022FINAL_Report.pdf

This table contains the Nevada 2020 - 2022 Integrated Report Total Maximum Daily Loads (TMDL) data in Nevada's Water Quality Assessment Reporting Tool. Data in this table are related to AssessedLakes_2022 and AssessedStreams_2022 through the fields WaterbodyCode and WATER_ID. Features having an approved TMDL in the related stream and lake feature classes will have anentry in the data table for each beneficial use and parameter cover under the TMDL.

NDEP Bureau of Water Quality Planning data from previous Nevada Water Quality Integrated Reports (cycles 2010, 2012, 2014, and 2018). Every two years the Nevada Division of Environmental Protection is required by the Clean Water Act (CWA) to conduct a comprehensive analysis of water quality data associated with Nevada's surface waters to determine whether state surface water quality standards are being met and designated uses are being supported. Nevada’s Water Quality Integrated Report is prepared in accordance with the requirements of Sections 303(d)/305(b)/314 of the Clean Water Act and is intended for use by the public, other entities, and NDEP for water quality management planning purposes. Due to time needed to gather, verify, and compile data into appropriate databases, the assessment period for the Integrated Report always lags about two years behind the present.For more information, please visit https://ndep.nv.gov/water/rivers-streams-lakes/water-quality-standards/303d-305b-water-quality-integrated-report

This map shows all the open data layers for Nevada Division of Environmental Protection's Bureau of Mining Regulation and Reclamation. Datasets include active reclamation sites, active regulation sites, pits, tailings, and waste rock dumps. For more information on the Bureau of Mining Regulation and Reclamation, please visit https://ndep.nv.gov/land/mining

This dataset shows sites addressed in the Nevada Brownfields Program (NBP), administered by Nevada Division of Environmental Protection (NDEP). Brownfields are properties that are abandoned, idle or underused due to actual or perceived contamination hindering potential redevelopment. The NBP provides services to communities to appropriately assess for the presence of environmental contamination and hazardous building materials on eligible brownfield properties. If contamination and/or hazardous building materials are discovered at levels that exceed regulatory criteria, the NBP will assist with mitigation and clean-up of contamination to ready the property for redevelopment. In circumstances where NBP does not have sufficient funding available to remove or clean-up the property to allow site access and redevelopment, NBP will work with the property owner to put safeguards in place to assure adequate protection to the public until the property can be cleaned up to regulatory standards. NBP assessment and clean-up process is described below. •NDEP conducts a Phase I Environmental Site Assessment (ESA) on an eligible property. A Phase I ESA conducts research on historical and current site uses and activities to determine the potential presence and sources of environmental contamination. •If necessary, based on the Phase I ESA research, Phase II ESA investigation is conducted including sampling and analyses of environmental media and building materials to confirm if potential contamination is present. •If contamination is found on a site, NDEP cleans it up to meet regulatory standards provided the resources are available. This dataset is updated daily from the Nevada Environmental Activities database.

This feature layer shows Bureau of Corrective Actions Leaking Underground Storage Tank (LUST) sites.This dataset is updated nightly from the Nevada Environmental Activities database.

This web map shows the open data layers for Nevada Division of Environmental Protection's Bureau of Corrective Actions. Datasets include Brownfields, Open BCA Sites, and closed BCA Sites. LUST and non-LUST (both open and closed) is also available for download as their own datasets.

This feature layer shows streams assessed for the Nevada 2020-2022 Water Quality Integrated Report. For more information, please visit https://ndep.nv.gov/uploads/water-wqm-docs/IR2022FINAL_Report.pdf

This feature class depicts the boundaries of Operable Unit 1 (OU1) within the Carson River Mercury Site (CRMS), including the four Area of Investigation boundaries. NDEP lead an initiative to refine the boundaries shown on maps identifying the Carson River Mercury Superfund Site (CRMS) from the initial site identification and description as the Carson River hydrographic basin beginning in Carson City, NV to its terminal points in Churchill County, NV. This description of the CRMS was used in many of the early site investigation studies and reports and continued to be used in all public education and long-term site management controls until approximately 2012. Using site contaminant fate and transport determinations from the CRMS OU1 Remedial Investigation (RI) and Conceptual Site Model (CSM), it seemed inappropriate to include the much larger area of the hydrographic basin as being potentially impacted by site contaminants of concern (CoC). NDEP created protocols to estimate areas that are likely to have been impacted by CoCs and created maps using these protocols to redraw the CRMS boundary limits. In the development of these protocols, NDEP used: Historic records and documentation of probable source areas; The 2012 archaeological mill site research and field study conducted by Broadbent & Associates to locate the historic source areas; Soil and sediment transport mechanisms identified in the CSM and general soil transport and sedimentology principals to predict areas where CoCs have likely been located at and downstream of the historic sources. The overall area of transport was estimated to be reasonably large to include possible anthropogenic activity as well as historic and future natural events such as flooding and channel migration. Additionally, NDEP added a “buffer” to extend the potential areas beyond the conservatively defined primary areas of potential contamination to further address unknown and future effects. These buffers have been identified separately from the primary areas of concern and labeled as such on maps using these protocols. These revisions were formalized in the 2013 Explanation of Significant Differences to the OU-1 Record of Decision (RoD) to adopt the new site definition and boundaries identified by NDEP as new estimates of the CRMS extents. NDEP identified four geographic areas of prime importance to the CRMS. Originally labeled by NDEP as “Risk Areas”, the intent of this terminology was to indicate these were the areas understood to have the most likely “risk” of contamination. Under consultation with EPA R9 risk assessment staff, the term has been changed to “Area of Investigation” to avoid confusion that any actual quantitative level of human or ecological risk has been determined for these areas. They are only estimates of potential contamination and new or additional information that contradicts these boundaries as being insufficient will be used to adopt new boundaries as appropriate. The four Areas of Investigation have become the foundation for the residential soil sampling program mandated by the OU-1 RoD. Summarized briefly; Investigation Area 1 (IA 1)- This includes all areas in the Carson River drainage basin from about the area of the historic settlement of Empire in Carson City, NV downstream to the existing or historic terminal points of the river at Carson Lake, Carson Sink, Indian Lakes and the Stillwater National Wildlife Refuge that lie outside the buffer zones of the other three Investigation Areas. It is least probable that CRMS CoCs will be located in these areas. It is unlikely that any sampling will be requested on areas developed within IA 1, but it might be requested in special circumstances, especially near and around the source areas of the contamination where historic activities could potentially have caused contamination beyond the typical boundaries as identified by the CSM. Investigation Area 2 (IA 2)- This area is defined as a buffer that lies 100 feet along a normal horizontal to the Investigation Area 3 boundary. For Comstock-era mill sites and isolated tailings piles, this translates to the area between 350 feet and 450 feet from the center point of the historic feature. For the 100-year FEMA floodplain and areas of irrigation, this is the area beginning at the limit of the flood plain boundary or irrigated land along a normal to 100 feet. Investigation Area 3 (IA 3)- This area is defined as a buffer that lies 100 feet along a normal horizontal to the Investigation Area 4 boundary for Comstock-era mills or isolated tailings piles. For Comstock-era mill sites and isolated tailings piles, this translates to the area between 250 feet and 350 feet from the center point of the historic feature. It is also defined as the limits of the FEMA 100-year floodplain or past or current flood irrigation practices. A tributary of the Carson River must have a Comstock-era mill site or tailings pile located along it to be mapped in IA3 and only the portion of the tributary downstream of the historic feature is included, not including the IA3 area and buffer drawn around the historic feature itself. If a tributary does not have FEMA 100-year flood plain defined, then IA3 has been defined as the area 100 feet along a normal to Investigation Area 4 boundary of that tributary. Investigation Area 4 (IA 4)- This area represents the highest likelihood of mercury contamination. Multiple steps were used to define the extent of this area, described below: The area within a 250 foot radius from the center point of a Comstock-era mill Comstock-era tailings pile polygon with a 250 foot buffer A 100 foot buffer around the centerline of the current channel of the Carson River (50 feet either side). The river channel itself is not part of OU1, however this area immediately adjacent to the river is within the FEMA 25-year floodplain and has a higher probability of contamination than the 100-year floodplain. Tributaries to the Carson River, where Comstock-era mills and tailings piles were located are enclosed in a polygon 50-feet wide (25 feet either side) from the approximate center of the tributary channel. Irrigation canals are enclosed in a polygon 20 feet wide (10 feet either side) from the approximate center of the ditch. Dataset last updated by NDEP in January 2022.