minntac tailings basin - proposed wq permit compliance points dark river @ cr 668 gw014 headwater of...
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Minntac Tailings Basin - Proposed WQ Permit Compliance Points
Dark River @ CR 668GW014
Headwater of Dark River or Seep
GW013
GW012
Little Sandy Lake Inlet
Admiral Lake
Proposed Boundary MW
Timber Creek
Identified Parameters of Concern
Minntac Tailings BasinGroundwater & Drinking
Water (trout)Industrial
ConsumptionAgric. and Wildlife Observed Concentrations
Parameters of Concern Class 1Secondary Drinking
Water Standard
Class 3B (trout) Class 3C
Class 4A (irrig. And wild rice)
Class 4B (livestock
and wildlife)GW012 Dark River @
CR668
Sand River / Twin Lakes
(Twin 1-Sept 2013)
Bicarbonates (HCO3 as CaCO3) 250 mg/L N/A 505 314
Fluoride 4.0 mg/L 2.0 mg/L NM 8.67 (seep) N/A
Hardness (Ca+Mg as CaCO3) 250 mg/L 500 mg/L N/A 1430 NM
Specific Conductance 1000 uS N/A 2367 1890
Sulfate 250 mg/L 10 mg/L 1000 mg/L 435 900 650
TDS 500 mg/L 700 mg/L 840 1950 1390
Potential Analytes in GW and SW Classes
GW 2A 2B 3 4 GW 2A 2B 3 4Alkalinity (Bicarbonate as CaCO3) Aluminum TotalAmmonia Antimony TotalBicarbonates (HCO3) Arsenic TotalFluoride Barium TotalHardness (Ca+Mg as CaCO3) Beryllium TotalpH Boron TotalPhosphorous (N lakes & Forest) CadmiumSalinity ChlorideSpecific Conductance Chromium (total)Sulfate Chromium +6TDS Cobalt, TotalTemperature CopperTSS Iron TotalTurbidity Lead
Manganese TotalMercuryNickel (salts)SeleniumSilverSodiumThallium Zinc
Minntac Tailings BasinPresumed Water Quality Compliance Limits for Permit Reissuance as of 10/21/2013
West Surface Water East Surface Water Groundwater
Parameter Dark River Origin
Dark River CR668
Dark River (trout) Timber Creek Admiral Lake Sand River -
L. Sandy Lk. GW012 GW013 GW014 GW-Prop
Bicarbonate (HCO3 as CaCO3) 250 250 250 250 250 N/A N/A N/A N/A
Hardness (Mg + Ca as CaCO3) 500 500 250 500 500 500 N/A N/A N/A N/A
Specific Conductance (uS/cm) 1000 1000 1000 1000 1000 N/A N/A N/A N/A
Sulfate (mg/L) 1000 1000 250 1000 1000 10 250 250 250 250
TDS (mg/L) 700 700 700 700 700 500 500 500 500
Fluoride (mg/L) N/A N/A 2 N/A N/A N/A 2 2 2 2
Iron (mg/L) 2 2 2 2 2 0.3 0.3 0.3 0.3TSS (mg/L) 30 30 30 30 30 N/A N/A N/A N/AAmmonia unkown unkown unkown unkown unkown unkown N/A N/A N/A N/A
Phosphorus unkown unkown unkown unkown unkown unkown N/A N/A N/A N/AMetals unkown unkown unkown unkown unkown unkown unkown unkown unkown unkown
Surface water limits are the applicable usage class Water Quality Standards since the stream's headwaters are at the tailings basin and receive tailings-impacted baseflow as their main source
Sulfate limits for West Surface Water assume Dark River is not deemed "Wild Rice Production Water"Final permit limits will be established based on review by Effluents Limit Staff of monitoring data to be collected and submitted by permittee