Washington County Water Consortium

Transcription

1 Agenda Washington County Water Consortium Joint Meeting with Groundwater Advisory Committee December 5 th, p.m. to 4 p.m. Washington County Government Center, nd St. N Stillwater Lower Level Room 14 2:00 2:05 Welcome Introductions, Announcements 2:05 2:40 White Bear Lake Modeling Topic: Results of DNR Analysis of Permitted Use within 5 miles of WBL Presenters: Jason Moeckel, MNDNR 2:40 3:15 The Three R s of Hugo s Stormwater Management Plan Topic: What s working, what s not working, challenges and barriers. Presenter: Bryan Bear, City of Hugo, Administrator 3:15 3:50 Cottage Grove PFC Filtration System Topic: Due to changes in health based values (HBVs) for Perflouroalkyl Substances (PFAS) in May of 2017, the City was informed 8 of 11 municipal wells were in exceedance. As a result, several municipal wells were taken offline permanently. In the summer of 2017, two interim Granular Activated Carbon (GAC) filtration plants were designed and constructed and brought online to filter PFAS contaminated water. This presentation will provide an overview of process it took to build and activate these filtration plants in a matter of months, and the various challenges met along the way. Presenter: Nathan Estrem, City of Cottage Grove, Project Engineer Ryan Capelle, P.E., Project Manager, Stantec 3:50-4:00 Questions/ Adjourn

2 December 2018 Washington County Water Consortium/Groundwater Advisory Committee Notes Announcements: None White Bear Lake Modeling, Results of DNR Analysis of Permitted use within 5 miles of WBL.: Topic: The results of DNR Analysis of Permitted Use within 5 miles of WBL will discuss effects of groundwater pumping on WBL and how the model can be used to explore the variety of options to make carefully targeted, well-informed modifications to water use in the area. Presenters: Jason Moeckel, MNDNR, Manager Inventory, Monitoring and Analysis Section Additional Notes: Groundwater model hopefully will help other type of questions happening to surface water resources in metro area. Evaporation study was one on WBL and is great data. Tells us that more water was evaporating off of WBL than past data told us. Items published on Oct 17 th 2018 in WBL Press and DNR website. How has water use changed around WBL within 5 miles by permittees, it has gone down.various scenarios were modeled. Pumping is implicated in the lake going below its protective elevation. In conclusion, there was no evidence of WBL being harmed. MN Statute 103G.287 subd.5 They are looking into the Littoral Zone acreage at different lake elevations. Emergent vegetation was showing up when the lake levels were low. The three square bulrush was the dominant emergent plant growing during the low water levels. This plant needs low levels to regenerated which tells us that water levels have been low in the past. Performed an individual permit analysis of Existing use scenario. Q: The median number is what? A: It s the number below the OHW at least 2 below.

3 The Three R s of Hugo s Stormwater Management Plan Topic: What s working, what s not working, challenges and barriers. Presenter: Bryan Bear, City of Hugo, Administrator Additional Notes: This is an integrated the water management plan. Half of water use has been used by irrigation. Looked at water conservation efforts with their residents. Stormwater re-use has the largest impact in Hugo. There are financial partners helping to contribute to paying for re-use projects in the City of Hugo. Oneka Ridge Golf Course is the first re-use system that was built. Instead of using drinking water for irrigation, they are now using stormwater re-use for irrigation. Beaver Ponds Park is a City owned system and also uses stormwater as a source for irrigation in the soccer fields. Retrofit of Water s Edge development, which is a residential re-use system. The stormwater pond in the neighborhood is now used for the irrigation in the neighborhood. The development was using groundwater before for irrigation. This system is helping to improve resiliency. The City owns the pumps and pipes and delivers stormwater to HOA, and the City Charges them for it. Clearwater Cove is another development using stormwater re-use for irrigation source. The development is adjacent to a judicial ditch 3. CSAH 8 Landscaping Plan. Landscaping in the boulevard and needs irrigation. Using stormpond for irrigation. Nearly 20,000,000 gallons of water saved in 2018 by using stormwater re-use. Savings are less than anticipated for non-residential users and golf courses, parks, etc. Residential users are the people that should be targeted for stormwater re-use, because they use more water and are seeing the savings.

4 Cottage Grove PFAS Filtration System Topic: Due to changes in health based values (HBVs) for Perflouroalkyl Substances (PFAS) in May of 2017, the City was informed 8 of 11 municipal wells were in exceedance. As a result, several municipal wells were taken offline permanently. In the summer of 2017, two interim Granular Activated Carbon (GAC) filtration plants were designed and constructed and brought online to filter PFAS contaminated water. This presentation will provide an overview of process it took to build and activate these filtration plants in a matter of months, and the various challenges met along the way. Presenter: Nathan Estrem, City of Cottage Grove, Project Engineer, Ryan Capelle, P.E., Project Manager, Stantec This is the subject of 3 M settlement that was settled earlier this year. This was handled as an emergency response and before settlement dollars were in place. This was a project that took a lot of teamwork to accomplish. The mission was to design and build 2 water treatment facilities within 90 days. Began May 22 nd, There were immediate action items. Declared a state of emergency so they didn t need to go through a regular bidding process for hiring contractors. All decisions were made on day 10 with collaborating partners. This helped to expedite the process of construction. They implemented granular activated carbon (GAC). There were no shortcuts taken in the project. The watering ban was lifted on August 1 st, This is the interim solution. There is still a permanent solution needed. A decision will be made once the 3 M settlement is finalized.

5 DNR s Groundwater Sustainability Analysis and White Bear Lake Jason Moeckel Ecological and Water Resources Section Manager Optional Tagline Goes Here mn.gov/websiteurl

6 White Bear Lake Completed Model Updates and Revisions Evaporation (U of M published study) Lake Bathymetry (incl. high resolution LiDAR) Aquifer Recharge Aquifer Conductivity Published results Oct. 17, 2018 in White Bear Press and DNR Website Completed Permit Analysis per Judges Order Evaluated Sustainability of Permitted use (individual and cumulative) Water Levels and the Protective Elevation

7 Elevation (feet) Setting Context: White Bear Lake Long-term Record Lake Outlet Elevation Long Term Median Lake Level DNR Established Protective Elevation Recorded Lake Level Court Ordered Irrigation Ban

8 Permits and Wells w/in 5 Mile Area

9 Millions of Gallons 5 Year Annual Average Groundwater Use within 5 Miles of White Bear Lake 10,000 8,000 6,000 4,000 2,000 7,977 8,210 7,118 7,818 7,224 6, Years Note: St. Paul Regional Water Services no longer relying on groundwater

10 Scenarios Modeled No use starting in 1988 reference Maximum authorized starting in 1988 Existing use (last 10 yrs.) projected backward Existing w / irrigation ban triggered at 923.5

11 Model Results

12 Modeling Analysis Summary MN Statute 103G.287 Subd. 5 Existing use does not harm the ecosystem Littoral zone, aquatic vegetation, F&W habitat Existing use does not violate aquifer safe yield Existing use does not degrade water quality Existing and past use results in water levels that go below the protective elevation (922 MSL) The model will be extremely useful for evaluating any changes

13 Change In Littoral Zone

14 Emergent Vegetation Emergent, rooted, flowering plant Grows in 0-6 ft. (mean = 2.5 ft) Three-square bulrush Clear-water lakes Reported as more common in low water years Well-adapted to change and high energy shores

15 Safe Yield: Prairie du Chien-Jordan Aquifer, WB Townhall

16 Lake Elevation and Water Clarity

17 Individual Permit Analysis Existing Use Scenario Largest Contributors White Bear Lake White Bear Township Mahtomedi Vadnais Heights Oakdale North St. Paul Saputo Dairy Foods Hugo Stillwater Lino Lakes White Bear Township

18 Total Permitted vs Actual Water Use

19 Existing Use - Illustration

20 Existing Use - Illustration

21 Existing Use - Illustration

22 Surface Water Appropriations 103G.285 During the determination of the protective elevation, the commissioner shall consider: 1. the elevation of important aquatic vegetation characteristics related to fish and wildlife habitat; 2. existing uses of the water basin by the public and riparian landowners; and 3. the total volume within the water basin and the slope of the littoral zone.

23 Setting the Protective Elevation: Technical Analysis Water levels - frequency analysis of historical record Median Lake Level Lake outlet Emergent aquatic vegetation needs periodic lower levels to regenerate (between elevation ) Fish habitat has benefited from diverse aquatic vegetation, especially nearshore emergent and floating leaf types Water quality and clarity not substantially related to water elevation Recreation (uses) Dock extensions when below 923 Navigation impacts (esp. sailing) below ~921.5 Ramsey Cty Swimming beach closed ~921 Bellaire and Mahtomedi beaches remained open Boat access compromised below 920

24 Model Results

25 2010 FSA Photo Lake Elevation ~ 920

26 Future Considerations Consider and evaluate options that would keep the lake from going below 922 under similar climatic regime Some % reduction in pumping Different sources for some permittees Change in the lake outlet elevation management Future growth and expansion Trends in water use 12/17/

27 Thank You! Jason Moeckel /17/2018 Optional Tagline Goes Here mn.gov/websiteurl 23

28 500 Lafayette Road St. Paul, MN or mndnr.gov The Minnesota DNR prohibits discrimination in its programs and services based on race, color, creed, religion, national origin, sex, public assistance status, age, sexual orientation or disability. Persons with disabilities may request reasonable modifications to access or participate in DNR programs and services by contacting the DNR ADA Title II Coordinator at or Discrimination inquiries should be sent to Minnesota DNR, 500 Lafayette Road, St. Paul, MN ; or Office of Civil Rights, U.S. Department of the Interior, 1849 C. Street NW, Washington, D.C , State of Minnesota, Department of Natural Resources 12/17/2018 Optional Tagline Goes Here mn.gov/websiteurl 24

29 Reduce, Reuse, Replenish: The Three R s of Hugo s Stormwater Management Plan Bryan Bear City of Hugo Water Consortium

30 Integrated Water Management

31 Hugo Water Usage 100 MG 225 MG 100 MG

32 Water Conservation Efforts New water rates Irrigation regulations Education efforts Grants for efficient toilets, washing machines Grants for smart irrigation controllers Requirements for topsoil Landscape ordinances Industrial and commercial re-use Stormwater re-use is king

33 Water re-use Financial Partners City of Hugo Met Council Rice Creek Watershed District Clean Water Legacy Fund Private developers Homeowners Associations

34 Oneka Ridge Golf Course

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36 Beaver Ponds Park CEAM 2015 Annual Conference

37 Beaver Ponds Park

38 Residential Re-use Retrofit Water s Edge Development Phase 1 CEAM 2015 Annual Conference

39 Waters Edge

40 Waters Edge 1100 homes with HOA At their peak usage: $120,000 water bill Retrofit all irrigation from groundwater supply to surface water supply City owns pumps, pipes and delivers stormwater to HOA We charge them for it Reduces peak demand on city water system Phase 1 complete. Phase 2 in 2019

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42 Clearwater Cove

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44 Clearwater Cove

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46 CSAH 8 Landscaping

47 CSAH 8

48 CEAM 2015 Annual Conference

49 CEAM 2015 Annual Conference

50 Oneka Place

51 Creekside Heights

52 Using Surface Water 1. Reduces groundwater use 2. Puts water back into the ground 3. Improves Water Quality 4. Reduces Downstream Flooding Volume Control 5. We can sell it for $$ Lower priced water for residents 6. Reduces peak demand on city water system 7. There are barriers It is harder to do than it should be

53 Peak demand Water system is designed for peak usage Requirement to operate system on peak day with one well off-line Peak day usually occurs in July or Aug Irrigation contributes to peak usage Stormwater use -- lowers the peak 2030 comp plan = 40,000 population 11 wells and 4 water towers 2040 comp plan = 40,000 population 7 wells and 3 water towers Capital savings

54 CEAM 2015 Annual Conference

55 CEAM 2015 Annual Conference

56 Observations Nearly 20,000,000 gallons saved in 2018 Over 6% of City s total water usage Program is still in infancy Likely to double by 2020 Savings are less than anticipated Especially for non-residential users Golf course, parks, etc Residential users are pumping more than expected Should be primary focus for future

57 Barriers 1. Finding enough surface water 2. Residents don t always appreciate low pond levels behind their house 3. Maze of regulation concerning water Tremendous uncertainty 4. WBL Lawsuit 5. Untested risky. Up-front investment 6. Maintenance of pumps, etc 7. Residents not acclimated to systems 8. Much easier to use drinking water

58 Clearwater Cove Re-use Discussions Appropriation permits Conservation of stormwater??? Change in statute concerning permits Discussion on Mixing of Waters Triggers permits again?? Discussion on future health codes Filters? Accommodate for changes? Uncertainty Water availability Interconnection with City water Additional set of pipes throughout neighborhood Stormwater Pipes Maintenance? Treating water where it lands On-site BMP s Credits for excess infiltration Shoreland requirements Agreements with Developer Covenants for HOA Education of Residents Management by HOA Balancing irrigation needs with pond aesthetics

59 MISSION: Interim Treatment Facilities for PFAS Contamination

60 Nathan Estrem, PE, Project Engineer Ryan Capelle, PE, Project Manager Interim Treatment Facilities for PFAS Contamination

61 Mission if you choose to accept it: Design and build two temporary water treatment plants in less than 90 days

62 May 22, 2017 MDH Meeting MDH informed City of new health-based values (HBV) City learns 8 of 11 wells now above new health-based values 5 wells taken offline, 3 wells blended with unaffected wells

63 Health Index Health Index is the cumulative ratio of actual concentrations divided by the Health Based Value (HBV) Health Index calculation Health Index = H.I. = ACTUAL PFC CONCENTRATION (ug/l) HEALTH BASED VALUE (ug/l) Current H.I. = PFOS + PFOA + PFBA + PFBS + PFHxS A cumulative H.I. over 1 is considered an exceedance, even if no single PFC exceeds its own HBV

64 Immediate Action Items Assemble emergency management staff Meet with school district Determine City s reduced maximum production capacity Prepare for bottled water distribution stations Work on public messaging Meet with GAC supplier

65 Game Plan Meeting with MPCA, MDH, and Washington County Decision not to use bottled water Would meet standards by only allowing essential water usage

66 PFAS Standards Change Firm Pump Capacity Current Capacity Peak Summer Demand Max Capacity (Normal Operations)

67 City Action Items Declare a State of Emergency Enacted city-wide outdoor water ban Issued a Code Red to notify residents of the watering ban

68 Treatment Locations

69 Well Sites Before Construction Well 3 Well 10

70 Tree Clearing at Well 10

71 Design Team Meeting

72 Treatment Process Implement Granular Activated Carbon (GAC) Acid Washed GAC selected for ph control Modeled Carbon life 255 days No pre-treatment based upon water quality and time constraints

73 Well 10 Site Plan

74 Well 10 Preliminary Design

75 Well 3 Site Plan

76 Well 3 Preliminary Design

77 3D Pipe Model

78 Site Grading Well 10

79 Permitting MDH Metropolitan Council Building Permit

80 Public Meetings

81 Communication

82 Footing & Foundation

83 Vessel Placement

84 Site Grading Well 3

85 Process Piping Well 10

86 Footings Well 3

87 Sanitary Service Well 10

88 Finished Grading Well 3

89 Carbon Placement Well 10

90 Backwash Water to Well Sites

91 May 30 July 18 Just over 6 weeks Media Installation Complete

92 Site Security Temporary security fence Security cameras Site lighting Padlocks on all valves Public Safety patrols Public Works site visits

93 Water Service Well 3

94 Treatment Testing Well 10

95 Cottage Grove Public Works tested the treated water from the treatment facility at Well 10 prior to placing the facility on line Mission Accomplished

96 City Lifts Watering Ban

97 Carbon Placement Well 3

98 Mission Accomplished

99 This mission was made possible by..

100 Partnerships

101 Contractors Taylor Electric TPC Keys Well Drilling Company Mill City Hardscape LPD Electric Morton Buildings, Inc. Plant & Flanged Equipment Burschville Construction Stonebrook Fence, Inc. Shank Constructor s, Inc. Braun Intertec Rumpca

102 Questions?

103 Constructed Buildings

104 Questions?