Pump Station Outlet to Otter Tail River- North Route Alternative

Transcription

1 Little McDonald, Kerbs & Paul Lake Improvement District Devils & Little Devils Lake Improvement District Pump Station Outlet to Otter Tail River- North Route Alternative Informational Meeting March 21, 2015 Perham, MN Agenda: Introductions Purpose of the project Project history Project details Potential downstream impacts Answer questions 3/21/2015 1

2 Little McDonald, Kerbs & Paul LID Board Roger Neitzke- Chair Joe Esser- Vice Chair Bill Putnam- Treasurer Sue Meyhuber- Secretary Ardell Wiegandt Glenn Schreier Dan Gleason Les Konley Mark Plencner Consultants: Engineers: Moore Engineering, Inc. Mike Opat, PE Attorney: Ohnstad Twichell, P.C. John Shockley 3/21/2015 2

3 Devils- Little Devils LID Board Jeana Nelson- President Bill Rohrich Lee Omberg Janet Storck (Currently open) Consultant: Houston Engineering LMKP & DLD LID Joint Project: Two separate collection systems would share one common transfer pipe Separate filtration systems DNR approved and permitted filtration systems Separate pumping systems Maximum capacity of combined system= 25 cfs LMKP approximately 20 cfs DLD approximately 5 cfs 3/21/2015 3

4 North Outlet Project Goal: Lower LMKP Lakes to Ordinary High Water Levels (OHWs) Lower DLD Lakes to OHWs 3/21/2015 4

5 Historical Perspective Same place on Paul Lake Photos on the left taken in 1966 Photo below taken in 2011 Owner had 50 feet of beach and 50 feet of grass 3/21/2015 5

6 Background Water levels have been rising for many years LMKP LID explored many solutions Ditch 25 Outlet Project Provide outlet from Little McDonald Lake west to Berger-Big McDonald-McDonald Lakes (Star Lake, Dead Lake, Otter Tail Lake ) Maximum discharge of approximately 22 cfs Project approved by county This option has been abandoned at this point: Limited operating period due to permit restrictions Still requires filtration and pumping 3/21/2015 6

7 Recent history July 12, 2014 LMKP LID membership meeting Board authorized to study north outlet to Otter Tail River August 20, Report on downstream impacts presented to Pine Lakes LID September 5, LMKP LID Board authorized soil borings September 23, LMKP LID Board meeting; considered preliminary findings October Multiple LMKP LID Board meetings November 1, LMKP LID membership meeting, authorized project to proceed to next phase February EAW published Otter Tail River Otter Tail River North Outlet Alternate Kerbs Little McDonald Paul Perham Big McDonald Otter Tail River 3/21/2015 7

8 Otter Tail River North Outlet Alternate Kerbs Little McDonald Paul Otter Tail River Little Pine Perham Big Pine Otter Tail River Rush Lake North Outlet Project: Water Collection & Filtration Water Transfer Paul Lake Connection Devils Lake Connection 3/21/2015 8

9 Filtration LMKP Lakes included on DNR s List of Infested Waters Zebra mussels Kerbs, Paul & Rusch tested positive veligers (larvae) found 1 year; no adults Little McDonald has not tested positive (3 times) Lakes will be tested again in July DLD Lakes have not been tested Cannot transfer water from infested waters without filtration and/or treatment Must be approved and permitted by DNR Collection/Filtration Horizontal drain filter Filter lake/groundwater through DNR approved system No direct connection to surface water Currently under review by DNR & University of Minnesota invasive species experts 3/21/2015 9

10 Collection/Filtration: Horizontal Drain Drain intake concept Closed Trench Drain (Tile) 3/21/

11 Soil Boring & Testing Completed in October Reduced risk and unknowns Verified lake/groundwater connectivity Better defined horizontal drain capacity Particle size filtration capabilities Water Transfer 30-inch diameter PVC pipe Pressurized force main 25 cfs capacity Buried below frost line Alignment utilizes existing public ROW where possible Landowners favorable to route Discharges into tributary of the Otter Tail River downstream of Long Lake Pump station (LMKP) Multiple pumps 250 Hp Connection point for Devils Lake 3/21/

12 Paul Lake Connection Regulatory & Permitting EAW Includes considerations for Devils Lake Available on Otter Tail County website Comment period closes mid-april State permits DNR Local permits OTC zoning Federal permits 3/21/

13 Downstream Water Levels Downstream impact analysis report included in EAW Available on Otter Tail County website Additional 25 cfs results in minimal increase in water levels downstream Pump operation regulated by operating plan Flows stopped when downstream areas are flooding 3/21/

14 Little Pine Lake Little Pine Lake Constant Discharge Pumped out of Maximum Lake Elevation (MSL 1912) Rise in Lake Level (ft) Little McDonald Lake (cfs) WC OHW MAXL WC OHW MAXL N/A N/A N/A WC: Initial lake level is at the dam weir crest elev. 1, ft (MSL 1912) when pumping starts OHW: Initial lake level is at the ordinary high water level elev. 1, ft (MSL 1912) when pumping starts MAXL: Initial lake level is at the maximum recorded high water level elev. 1, ft (MSL 1912) when pumping starts 3/21/

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16 Big Pine Lake Big Pine Lake Constant Discharge Pumped out of Maximum Lake Elevation (MSL 1912) Rise in Lake Level (ft) Little McDonald Lake (cfs) WC OHW MAXL WC OHW MAXL N/A N/A N/A WC: Initial lake level is at the dam weir crest elev. 1, ft (MSL 1912) when pumping starts OHW: Initial lake level is at the ordinary high water level elev. 1, ft (MSL 1912) when pumping starts MAXL: Initial lake level is at the maximum recorded high water level elev. 1, ft (MSL 1912) when pumping starts 3/21/

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18 Rush Lake Rush Lake Constant Discharge Pumped out of Little McDonald Lake (cfs) Maximum Lake Elevation (MSL 1912) Rise in Lake Level (ft) WC OHW MAXL WC OHW MAXL N/A N/A N/A WC: Initial lake level is at the dam weir crest elev. 1, ft (MSL 1912) when pumping starts OHW: Initial lake level is at the ordinary high water level elev. 1, ft (MSL 1912) when pumping starts MAXL: Initial lake level is at the maximum recorded high water level elev. 1, ft (MSL 1912) when pumping starts 3/21/

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20 Otter Tail River- Between Little & Big Pine Max Q=635cfs OHW Q=225cfs Crest Q=25cfs Otter Tail River- Between Big Pine & Rush Lake Max Q=1815cfs OHW Q=450 cfs Crest Q=25 cfs 3/21/

21 Otter Tail River- Between Rush Lake & Ottertail Lake Max Q=1630cfs OHW Q=530cfs Crest Q=25 cfs 3/21/

22 Water Quality Water body Impairment Total Phosphorus (mg/l) Chlorophyll-a (µg/l) Secchi Depth (m) (Water Clarity) Upstream of Discharge Point Long Lake Mercury in fish tissue n/a n/a n/a Rice Lake No impairment reported LMKP Lakes Little McDonald Lake Mercury in fish tissue Kerbs Lake No impairment Paul Lake No impairment Devils Lake No impairment Otter Tail River Mercury in fish tissue Downstream Lakes Mud Lake No impairment reported Little Pine Lake Mercury in fish tissue Big Pine Lake Mercury in fish tissue Rush Lake Mercury in fish tissue Source: Minnesota Pollution Control Agency ( ) Potential Schedule Spring 2015: EAW process completed (?) Chapter 429 assessment process Start permitting & land acquisition Summer 2015: Design & Bidding Fall 2015(?): Construction December 2015: Operation? 3/21/