20170606 12551200 1.0 FGDC 150000000 5000 20260311 04503900 TRUE These data are intended to be used for planning, informational, and cartographic purposes related to surface water quality in Minnesota. <DIV STYLE="text-align:Left;"><DIV><P><SPAN>This is a set of the impaired lakes as determined by MPCA's surface water quality assessment process in 2014 and 2015 for the 2016 reporting cycling to US Environmental Protection Agency (EPA). Lakes declared impaired prior to 2016 are also included in this dataset unless they have been delisted. The waterbodies included in the dataset were submitted to EPA in January, 2017 as part of the impaired waters list. EPA evaluates the list and either approves it as-is or modifies it, which may result in changes to this spatial data. </SPAN></P><P><SPAN>Note that for the purpose of submitting the impaired waters list to EPA, waterbodies partially or wholly within Indian reservation boundaries are published in separate datasets. The MPCA still considers these waters impaired and has an interest in restoring them. The MPCA respectfully requests that the waters partially or wholly within Indian reservations be symbolized differently on map products so that viewers can differentiate them from waters not intersecting Indian reservations. </SPAN></P><P><SPAN>These lakes are a subset and enhancement of the 1:24,000 scale National Hydrography Dataset (NHD). In cases where the NHD does not include lakes that MPCA has assessed, additional lakes from the MN Department of Natural Resources (DNR) Division of Waters lakes database are added. Since the impaired lakes are a small subset of the NHD and DNR lakes, only that subset is included in the dataset. This dataset includes impaired lakes which have not yet had a TMDL plan approved by the US EPA, those that have a US EPA approved TMDL plan as well as those lakes that do not need a TMDL plan. </SPAN></P><P><SPAN>Please keep in mind that the data herein are subject to change. We ask that any maps made with this data indicate the 'proposed' status. To be notified of updates to this shapefile, please send an email to kristofor.parson@state.mn.us</SPAN></P></DIV></DIV> Impaired Lakes, Minnesota, 2016 (Proposed) inlandWaters surface water water chemistry water quality All lakes contained in this shapefile are on the proposed 2016 Impaired Waters list prepared by the Minnesota Pollution Control Agency. AUID: Assessment Unit ID, a waterbody identifer based on the MN DNR lake ID. This AUID constitutes a unique identifer for each lake in the dataset. CAT: EPA Consolidation Assessment and Listing Methodology [CALM] category, which integrates the 305(b) Report with the 303(d) TMDL List. The five categories in CALM are as follows: Category 1: all designated uses are meeting water quality standards Category 2: some uses are meeting water quality standards and there are insufficient data to assess other uses Category 3: there are insufficient data to assess any uses Category 4: at least one use is impaired, but a TMDL is not required Category 5: at least one use is impaired and a TMDL is required. These become the List of impaired waters. A reach can only be placed into one Category. For example, if a reach is impaired for one pollutant but the other uses are being met, and a TMDL is required, that reach would be placed into Category 5. Furthermore, if the reach is impaired for more than one pollutant, the reach must stay in Category 5 until ALL pollutants have EPA-approved TMDL plans. For 'bookkeeping' purposes, these Categories can be sub-divided. Category 4 has the following four sub-categories: 4A: Impaired, but a TMDL study has been approved by EPA 4B: Impaired, but a TMDL study is not required because water quality standards are expected to be met in the near future 4C: Impaired, but a TMDL study is not required because the impairment is not caused by a pollutant 4D: An assessment unit is impaired or threatened but doesn't require a TMDL because the impairment is due to natural conditions with only insignificant anthropogenic influence. To be considered 'insignificant', the elimination of the anthropogenic influence would not lead to the attainment of water quality standards and it would not be included in formal pollution reduction goal-setting activities. A reach-specific water quality standard based on local natural conditions has yet to be determined. Upon determination, the assessment unit will be considered non-impaired for the natural conditions and re-categorized to an appropriate category. 4E: Impaired or threatened but existing data indicates a TMDL is not required because impairment is solely a result of natural sources; a final determination of Category 4D will be made in the next assessment cycle pending confirmation from additional information (i.e. water quality or land use). Category 5 has the following three sub-categories: 5A: Impaired by multiple pollutants and no TMDL study plans are approved by EPA 5B: Impaired by multiple pollutants and at least one TMDL study plan is approved by EPA 5C: Impaired by one pollutant and no TMDL study plan is approved by EPA NAME: Name of the lake associated with the AUID. REACH_DESC: The description of the lake's location. USE_CLASS: Use class per MN Statute 7050.0470. AREA_ACRES: The area, in acres of the lake (assessment unit). AFFECTED_U(SE): Impaired Use(s) Possible Values: AQL: Aquatic Life AQR: Aquatic Recreation AQC: Aquatic Consumption DW: Drinking Water LRV: Limited Resource Value Impairment Fields The TMDL_xxxx fields contain parameters for which the waterbody is impaired. A complete list of parameter abreviations and their associated pollutants can be found below, in the Target Start Years portion of the metadata document. TMDL_NOT_R(EQUIRED): The parameter(s) for which no TMDL plans is required. TMDL_APPRO(VED): The parameter(s) for which TMDL plans have been approved. TMDL_NEEDE(D): The pollutant(s) for which TMDL plans must be developed and approved. IMPAIR_PAR(AMETERS): Parameters listed in TMDL_APPROVED and TMDL_NEEDED that cause the stream to be impaired. NEW_IMPAIR(MENTS): Parameters proposed to be listed for the first time in the reporting cycle of the dataset. Potential values for impairment parameters in the above fields: Cl-: Chloride FishesBio: Fishes bioassessments Hg-F: Mercury in fish tissue Hg-W: Mercury in water column Nutrients: Nutrient/eutrophication biological indicators PCB-F: PCB in fish tissue PFOS-F: Perfluorooctane Sulfonate (PFOS) in fish tissue HUC_8: The numeric code of the 8 digit Watershed Boundary Dataset (WBD) polygon that this waterbody is primarily associated with. HUC_8_NAME: The name of the DNR major watershed that this waterbody is primarily associated with. HUC_4: The numeric code of the 4 digit Watershed Boundary Dataset (WBD) polygon that this waterbody is primarily associated with. BASIN: The name of the basin (HUC4) in which this waterbody is located. COUNTY: The name of the county that the majority of this waterbody, or the sampling sites, intersects. TRIBAL_INT: Values include None, Partially, and Wholly. Depicts the intersection relationship between the waterbody and Indian reservations. INDIAN_RES: The name of the tribe who's land the waterbody intersects. Target start year fields: These fields indicate the target start year for a TMDL addressing their respective pollutants: Fields: CHLORIDE FISHESBIO: Fish Index of Biological Integrity HG_F: Mercury in Fish Tissue HG_W: Mercury in the Water Column NUTRIENTS: Nutrient/eutrophication biological indicators PCB_F: PCB in Fish Tissue PFOS_F: Perfluorooctane Sulfonate (PFOS) in Fish Tissue