The URL can be used to link to this page

Home My WebLink About#03 NMLG-Model-ResultsWBL-work-group-20250326 (1)NMLG Model Results for White Bear Lake, Ultimate Demand Scenarios Glen Champion |Hydrologist Overview •Review ultimate demand scenarios •75 gpcd residential and 90 gpcd total demand goals •Groups of water systems off groundwater (surface-water supply) •Lake augmentation (example) •Injection of treated wastewater into bedrock aquifer Summary of Ultimate-Demand Scenarios Scenario Descripton Ultimate (Hugo 1)Long-term groundwater use at projected Ultimate demands (2030/2040 MUSA in Hugo) Ultimate (Hugo 2)Long-term groundwater use at projected Ultimate demands (expanded MUSA in Hugo) All Groundwater Water Demands and Goals Court Order applied to groundwater users in 5-mile buffer around WBL “. . . all existing permits include an enforceable plan to phase down per capita residential water use to 75 gallons per day and total per capita water use to 90 gallons per day.” How would meeting the 75 and/or 90 goals for communities remaining on groundwater affect scenario results? Per Capita Demands 0.0 50.0 100.0 150.0 200.0 250.0 300.0 ga l l o n s p e r c a p i t a p e r d a y 2014-23 Average Residential All Other Total Goal Residential Goal Per Capita Demand Goals -Residential 0 50 100 150 200 250 300 North Oaks Woodbury ga l l o n s p e r c a p i t a p e r d a y Residential Residential Residential Goal Per Capita Demand Goals 0.0 20.0 40.0 60.0 80.0 100.0 120.0 Lake Elmo Stillwater Vadnais Heights White Bear Township (North) Woodbury (Res. To 75) ga l l o n s p e r c a p i t a p e r d a y Total Over 90 Residential Non-Residential Goal 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 Lake Elmo Stillwater Vadnais Heights White Bear Township (North) Woodbury (Res. To 75) ga l l o n s p e r c a p i t a p e r d a y Non-Residential Non-Residential Meets Goal Alternative Future Demand Considerations •Systems over 75 gpcd residential75 gpcd •Systems over 90 gpcd ? •Possibilities for further reductions in future per capita demands? •Reduce non-residential, per capita demands by X%? •Non-residential only 20% to 45% per capita reductions •Per capita residential reductions (median = 71)? •Uncertainties in Ultimate and actual populations served Alternative Future Demand Scenario •Initially tested adjusting residential per capita to 75 gallons •North Oaks and Woodbury •Other possibilities? Replace Groundwater Supplies –Approach •Tested multiple replacement scenarios in model •2014 Met Council study •Hugo 1 and Hugo 2 development options •Same in groundwater model if extra development area supplied with surface water Replace Groundwater Supplies –Previous Study (2014) Replace Groundwater Supplies –Present Analysis White Bear Township (South) North Oaks Saputo Cheese USANew WTP Replace Groundwater Supplies – Replace 6 (SW 2) North Oaks Saputo Cheese USA White Bear Township (South) New WTP Model Results– Replace 6 Permits (SW 2) •Hugo 1 •Replace 6 permits, 4 communities Model Results– Replace 6 Permits (SW 2a) •Hugo 1 •Replace 6 permits, 4 communities •North Oaks and Woodbury  75 gpcd residential •Other demand reduction options? Replace Groundwater Supplies - Summary Scenario Brief Description Communities / Permits SW 2a (Hugo 1)Replace 6 permits with reduced demands Mahtomedi, Saputo Cheese USA, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 3 (Hugo 1)Replace 7 permits Mahtomedi, North St. Paul, Saputo Cheese USA, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 3-2 (Hugo 2)Replace 7 permits with reduced demands Mahtomedi, North St. Paul, Saputo Cheese USA, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 4 (Hugo 1), SW 4-2 (Hugo 2) Replace 9 permits Mahtomedi, North St. Paul, Saputo Cheese USA, Shoreview and North Oaks( joint system), Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 5 (Hugo 1)Replace 7 permits Mahtomedi, North Oaks, Saputo Cheese USA, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 6a (Hugo 1)Replace 6 permits with reduced demands Mahtomedi, North Oaks, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 2c (Hugo 1)Replace 6 permits and injection of 1 mgd treated wastewater Mahtomedi, Saputo Cheese USA, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 7 (Hugo 1)Replace 4 permits and injection of 2 mgd treated wastewater Saputo Cheese USA, White Bear Lake, White Bear Township (2 systems) Lake Augmentation •Two previous conceptual cost studies (Met Council, 2014 and DNR and Met Council 2016) •Water -quality study starts soon •Initial model test •Hugo 2, all communities remain on groundwater supplies •Augmentation during open-water season •Trigger - 923 ft if not rising •Up to 780 MGY (< ½ previously studied) •Max rate ~ 4 mgd Augmentation Example •Hugo 2 •Augmentation during open-water season 2006- 07, part of 2008, 2009- 10, part of 2011, and part of 2012 Replacement vs. Augmentation Comparison •Hugo 2 •Augmentation vs. SW 3-2 (Replace 7 permits, 5 communities) Injection of Treated Wastewater •Ultimate (Hugo 1) •Injection well(s) adjacent to WBL, 1 mgd or 2 mgd Injection of Treated Wastewater and Replace Groundwater Supplies •Ultimate (Hugo 1) •Injection well adjacent to WBL, 1 mgd •Replace 6 permits, 4 communities (SW 2) •Injection well(s) adjacent to WBL, 2 mgd •Replace 4 permits, 2 communities (SW 7) Replace Groundwater Supplies – Replace 4 Permits (SW 7) North Oaks Saputo Cheese USA White Bear Township (South) New WTP? Summary of Options Type Ultimate Demand Scenario Options Replace groundwater supplies Hugo 1 •Replace 6 permits with demand reductions (SW 2a) •Replace 7 permits (SW 3 and SW 5 ) •Replace 9 permits (SW 4) Replace groundwater supplies Hugo 2 •Replace 9 permits (SW 4-2) •Replace 7 permits with demand reductions (SW 3-2) •Hugo 1 options with expanded Hugo area supplied with surface water Augmentation Hugo 1 or Hugo 2 •Augmentation trigger elevation Combine surface-water supply with injection of treated wastewater Hugo 1 •Replace 6 permits (2 options) with 1 mgd injection (SW 2, SW 6) •Replace 4 permits with 2 mgd injection (SW 7) •Replace < 6 permits with 1 mgd injection? Combine surface-water supply with injection of treated wastewater Hugo 2 Not tested, likely several options Thank You! Glen Champion glen.champion@state.mn.us 651-259-5652 Supplemental Slides Replace Groundwater Supplies – Replace 7 Permits (SW 3) North Oaks Saputo Cheese USA White Bear Township (South) New WTP Model Results– Replace 7 Permits (SW 3) •Hugo 1 •Replace 7 permits, 5 communities Replace Groundwater Supplies – Replace 7 Permits (SW 5) North Oaks Saputo Cheese USA White Bear Township New WTP Model Results– Replace 7 Permits (SW 5) •Hugo 1 •Replace 7 permits, 5 communities Replace Groundwater Supplies – Replace 9 (SW 4) White Bear Township (South) North Oaks Saputo Cheese USANew WTP Model Results– Replace 9 Permits (SW 4) •Hugo 1 •Replace 9 permits, 7 communities Model Results– Replace 9 Permits (SW 4-2) •Hugo 2 •Replace 9 permits, 7 communities Replace Groundwater Supplies – Other Tested Scenarios Scenario Brief Description Communities / Permits SW 2 (Hugo 1)Replace 6 Mahtomedi, Saputo Cheese USA, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 2b (Hugo 1)Replace 6 with reduced demands Mahtomedi, North St. Paul, Saputo Cheese USA, White Bear Lake, White Bear Township (2 systems) SW3-2 (Hugo 2)Replace 7 Mahtomedi, North St. Paul, Saputo Cheese USA, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) SW 6 (Hugo 1)Replace 6 Mahtomedi, North Oaks, Vadnais Heights, White Bear Lake, White Bear Township (2 systems) Replace Groundwater Supplies – Replace 6 Permits (SW 2b) North Oaks Saputo Cheese USA White Bear Township (South) New WTP Model Results– Replace 6 Permits (SW 2b) •Hugo 1 •Replace 6 permits, 4 communities •North Oaks and Woodbury  75 gpcd residential •Further demand reductions? •Other options? Model Results– Replace 7 Permits (SW 3-2) •Hugo 2 •Replace 7 permits, 5 communities •Needs demand reductions or other options Replace Groundwater Supplies – Replace 6 Permits (SW 6) North Oaks Saputo Cheese USA White Bear Township (South) New WTP Model Results– Replace 6 Permits (SW 6) •Hugo 1 •Replace 6 permits, 5 communities •Requires demand reductions or other options North and East Metro Groundwater Management Area Permits and Wells w/in 5 Mile Area Average Annual Volume of Water Use – Recent and Projected