Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
1
Developing a Plan to Improve Water Quality in the
Lower Vermillion River
Public Meeting for the Turbidity Total Maximum Daily Load Study
March 19, 2008
Hastings, Minnesota
6:30 PM
2
MPCA: Minnesota Pollution Control Agency
PCB: Polychlorinated biphenyls
3
Agenda
• Welcome and Introductions• Background Information
– TMDLs, Turbidity, Vermillion River• Project Update and Review• Recommendations• Next Steps• Discussion
Goal: Info Exchange
4
Welcome
• Introductions– Minnesota Pollution Control Agency (MPCA)– Tetra Tech– Stakeholders
5
• Background– TMDLs, Turbidity, Vermillion River
6
Background: TMDLs
• In the 1970’s, the Clean Water Act provided motivation and funding to identify water quality problems and to develop solutions to correct these problems
• States have a responsibility to create water quality standards and assess water bodies (such as a lakes, rivers, and streams)
• Based on the specific use of the water bodies, States must identify waters not meeting water quality standards (303d list)
7
TMDLs Continued• Total Maximum Daily Loads (TMDLs) are required to be
developed for each pollutant in a water body on the 303d list (also known as the impaired waters list)
• In general terms, a TMDL is the amount of a specific pollutant that a water body can receive and attain and maintain a given water quality standard
• A strategy for achieving the water quality standard must be developed, approved, and then implemented
8
What is the Process for Developing a TMDL?
Collect and Analyze Data
Develop and Test Options for Reducing Pollutants
Select Best Option and Develop Implementation Strategy
Implement and Monitor Progress
Stakeholder Involvement
Stakeholder Involvement
9
Translation
Techie & Acronym-Laden Explained
Aggressive terminology and plenty of acronyms, but this is a basic process that is our best available tool for cleaning up our waters.
Designated Uses
WQ Standards
Impaired Waters
TMDLs
Implementation
Designated Uses
WQ Standards
Impaired Waters
TMDLs
Implementation
What You Do
Pollution Limit
Polluted Waters
Problem Investigation
Fix the Problem
What You Do
Pollution Limit
Polluted Waters
Problem Investigation
Fix the Problem
10
Background: Vermillion River
11
Salmo trutta
Upper Vermillion:
Trophy Brown Trout Fishery
12
13
MN State Record Black Crappie
1940, Vermillion River
5 pounds, 0 ounces
21 inches long
The Vermillion River
High Water Inundation in Floodplain Forest
July 2001
15
The Vermillion River
Looking downstream from Etter Bridge
November 2003
16
The Vermillion River
Vegetated Shoreline – Lakes Segment
July 2001
17
Background: Turbidity
• In general terms, turbidity is a measure of the clarity of a liquid. It is a surrogate parameter, that suggests the presence of suspended solids or dissolved matter.
18
nephelo-, nephel-, nepho- neph-
• (Greek: cloud, clouds, cloudiness) • Some related words:
– Nephelogical: Related to clouds or cloudiness.– Isonephelic: An indication of the equality of
cloudiness.– Hypernephelist: Someone who goes above the
clouds.– Nephalism: Total abstinence from alcoholic
beverages.
19
Turbidity Background Con’t
• Minnesota’s turbidity water quality standard = 25 NTU
• Waters with turbidity over 25 NTU can stress aquatic life
• Waters that go over 25 NTU repeatedly are considered impaired
20
Turbidity Visuals
~0-3 NTU
~0-3 NTU
~12-20 NTU
~12-30 NTU??
21
Why is Turbidity an Issue?• Impacts to Recreation
– Reduced visibility for swimmers and boaters – Reduced sportfish populations
• Impacts to Health– Increased potential for waterborne diseases from recreation– Increased need for drinking water treatment
• Impacts to Aquatic Life– Reduced light for submerged aquatic plants– Increased temperatures– Reduced oxygen levels
22
Affected Use: Aquatic Lifei.e. keep eye on prize
23
24
25
Stonefly Genus Agnetina (Golden Stones)
26
Behavioral Changes
Salvelinus fontinalisSSC Conc: 4.5 mg/l(~3-4 FNU)Duration: 168 hoursOverhead cover abandonedGradall & Swenson 1982
27
Mortality
Salmo truttaSSC Conc: 110 mg/l(~80 FNU)Duration: 1440 hours98% mortality of eggsScullion & Edwards 1980
28
Warmwater too…
29
30
How Much is Too Much?
0
10
20
30
40
50
60
70
80
90
100
1989 1991 1994 1997 1999 2002 2005
TUR
BID
ITY
(NTU
)
MS221MS297MS299VR002VM00.1WQS
31
Goals of the Turbidity TMDL Study
• To define the nature and extent of the turbidity impairment
• To understand how sediment is transported and how it affects aquatic life
• To evaluate the total sediment load for an "unimpaired“ Vermillion River
• To better understand how various sources influence turbidity levels
• To integrate TMDL efforts with long-range Pool 3 planning and management efforts
• To ultimately find a solution to the impairment
32
Lower Vermillion River Turbidity TMDL
• MPCA contract with Tetra Tech• Phased Approach
– Phase I: Data Gathering and Model Development (2003/2004)
– Phase II: Sampling and Model Development (2006/2007)– Phase III: Model Refinement and TMDL Development
(2007/2008)
33
Phase I Tasks• Compiled all available water quality and biological data
• Researched information on numerous manmade structures that control flow between Pool 3 and Lower Vermillion River
• Statistical analysis of relationship between TSS, nutrients, chlorophyll a, and turbidity
• Developed conceptual understanding of LVR turbidity
34
Conceptual Model
Turbidity
OrganicDetritusAlgaeInorganic
Solids
Algal &Detrital Input
PhosphorusInput
SedimentInput
LocalWatersheds
ChannelErosion
UpperVermillion
MississippiRiver
Turbidity
OrganicDetritusAlgaeInorganic
SolidsOrganicDetritusAlgaeInorganic
Solids
Algal &Detrital Input
PhosphorusInput
SedimentInput
Algal &Detrital Input
PhosphorusInput
SedimentInput
LocalWatersheds
ChannelErosion
LocalWatersheds
ChannelErosion
UpperVermillion
UpperVermillion
MississippiRiver
MississippiRiver
35
Phase I Findings
• Inorganic sediment appears to be the primary cause of elevated turbidity (62 percent)
• Pathways involving algae and organic detritus contribute about 38 percent (on average) of the observed turbidity in the LVR
36
Phase I Findings (continued)
• Scoping Level Estimates of Sediment Inputs– Mississippi Pool 3 (62 percent)– Upper Vermillion River (21 percent)– Local tributaries (17 percent)– Internal sources unknown
• Algal growth within the LVR is a secondary contributor to turbidity and is sensitive to concentrations of phosphorus
37
Monitoring and Field Work Update
38
Dike Functionality
Truedale Slough Dike: functional with rusty culvert
DNR Dike: nonfunctional dike bypassed by water
Three Bridges Dike: nonfunctional dike no longer intact
Spot Dike K: nonfunctional dike located in wetland area
39
Example Cross SectionsCross-Section 1
677.00
678.00
679.00
680.00
681.00
682.00
0 10 20 30 40 50 60 70 80
Distance (feet)
Elev
atio
n (f
eet M
SL)
Cross-Section T
660.00
665.00
670.00
675.00
680.00
0 20 40 60 80 100 120 140
Distance (feet)
Elev
atio
n (f
eet M
SL)
Cross-Section 15
655.00
660.00
665.00
670.00
675.00
0 50 100 150 200 250
Distance (feet)
Elev
atio
n (f
eet M
SL)
40
Modeling
• What is a model?– Mathematical formulation describing the physical
behavior of a waterbody and its temporal variability– Inputs
• Weather• Stream channel characteristics• Boundary flows and concentrations
– Outputs• Time varying (e.g., hourly, daily, monthly, annual) flow and
concentrations• Multiple locations
41
Modeling Update (continued)
• Why model?– Determine load reductions needed to meet
water quality goals– Evaluate potential pollutant sources– Assess potential restoration scenarios– Modeling used in combination with other
data/information to inform policy and make final management decisions
42
Phase 2 and 3 Modeling
• Soil and Water Assessment Tool (SWAT) Model to Estimate Loads from Local Tributaries
• FLUX Model to Estimate Loads from Upper Vermillion River
• CE-QUAL-W2 Model to Estimate Conditions in the Lower Vermillion River
43
44
Modeling Process• Step 1. Set up model
– Acquire and organize model inputs
• Step 2. Calibrate and validate models to available flow and water quality data– Adjust model parameters to obtain best possible fit to observed
data
• Step 3. Run models for various scenarios to evaluate management alternatives– Identify key sources of pollution – Identify potential impact of various alternatives
45
Modeling Results
Sources of Flow
Vermillion Slough15%
Truedale Slough31%
Carter Slough21%
Upper Vermillion
River21%
Local Tributaries
5%
Pool 41% Internal
Sources6%
Sources of Sediment
Internal Sources
3%
Pool 41%
Local Tributaries
16%
Upper Vermillion
River8%
Carter Slough21%
Truedale Slough35%
Vermillion Slough16%
46
Modeling Results (continued)• Distinctly different
conditions depending on stage of Mississippi River– Mode 0: insignificant
inflow from the Mississippi
– Mode 1: Mississippi River inflows dominate conditions
650655660665670675680685690695
0 1
1.25 4
4.5
5.5 6 6 6 9
9.5 10
Hastings
650655660665670675680685690695
0 1
1.25 4
4.5
5.5 6 6 6 9
9.5 10
Hastings
650655660665670675680685690695
0 1
1.25 4
4.5
5.5 6 6 6 9
9.5 10
Vermillion Slough
650655660665670675680685690695
0 1
1.25 4
4.5
5.5 6 6 6 9
9.5 10
Vermillion Slough
650655660665670675680685690695
0 1
1.25 4
4.5
5.5 6 6 6 9
9.5 10
Truedale/Carter Slough
650655660665670675680685690695
0 1
1.25 4
4.5
5.5 6 6 6 9
9.5 10
Truedale/Carter Slough
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Etter Bridge
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Etter Bridge
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Mouth 650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Mouth
Mode 0
Vermillion Slough: Stagnant
Truedale Slough: Inflow through culvert
Carter Slough: Stagnant
Etter Bridge: Free flowing
Mouth: Free discharge
47
Modeling Results (continued)• Distinctly different
conditions depending on stage of Mississippi River– Mode 0: insignificant
inflow from the Mississippi
– Mode 1: Mississippi River inflows dominate conditions
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Hastings
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Hastings
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10Vermillion Slough
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10Vermillion Slough
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Truedale/Carter Slough
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Truedale/Carter Slough
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Etter Bridge
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Etter Bridge
650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Mouth 650655660665670675680685690695
0 11.2
5 4 4.5 5.5 6 6 6 9 9.5 10
Mouth
Mode 1
Vermillion Slough: Inflow at 675.3’
Truedale Slough: Inflow at 677.5’
Carter Slough: Inflow at 677.5’
Etter Bridge: Free flowing or backwater
Mouth: Backwater
48
Modeling Results (continued)
• Following combination of load reductions found to achieve water quality standards during both modes– Turbidity in Pool 3 simulated as achieving water
quality standards – Loads from internal sources reduced 86 percent during
Mode 0– No reductions to Pool 4 loads– No reductions to Upper Vermillion River loads (other than
removing Empire WWTP load)
49
TMDL Allocations• Clean Water Act requires that TMDLs be
allocated as follows:– TMDL = WLA + LA + MOS– Wasteload Allocations (WLA) for “point
sources” (regulated under NPDES)– Load Allocations (LA) for nonpoint sources
and natural background– MOS for Margin of Safety
50
TMDL Allocations (continued)
Mode 0 (Minimal Pool 3 Inflow)
Mode 1 (Significant Pool 3 Inflow) Allocation
Component: Source Existing TSS Load (kg/day)
Allowable TSS Load (kg/day)
Percent Reduction
Existing TSS Load (kg/day)
Allowable TSS Load (kg/day)
Percent Reduction
TMDL= LA+WLA+MOS 12,117 5,619 54% 234,993 121,876 48% LA: UVR 1546 1546 0% 9808 9808 0% LA: Pool 3 1 1 0% 204,913 94,260 54% LA: Pool 4 1 1 0% 1 1 0% LA: Internal Sources 6,928 956 86% 1 1 0% WLA: Facilities 149 149 0% 149 149 0% WLA: MS4s 844 844 0% 5,229 5,229 0% MOS (Local Tributaries) 2,648 2,250 15% 14,892 12,658 15%
51
What Are Possible Solutions?• Lake Pepin TMDL
– Reduce Mississippi loads at major inlets • Water Level Management
– Reduce sediment re-suspension• consolidation of sediments (periodic drawdowns)• island building
– Perennial vegetation• Fish Management• Rural and Urban BMPs
– Reduce streambank erosion with stabilization projects– Soil conservation on row-crop land
52
Lake Pepin TMDL• Identified impairments include excess nutrients (eutrophication)
and turbidity• Multi-year project to develop
TMDL• Modeling ongoing• TMDL scheduled to be completed
in 2009• Lake Pepin TMDL Forum
– Wednesday, April 16, 2008– 8:30 a.m. to 3:30 p.m.– St. James Hotel, Red Wing, MN
53
Water Level Management• Help restore the natural
seasonal fluctuation in water levels that the plants desire
• MDNR has identified three potential strategies:– Pool-wide Pool 4 summer
drawdowns– Vermillion Bottoms/Goose
Lake HREP type drawdowns of the LVR
– Individual LVR backwater lake drawdowns
54
Fish Management• Any attempt to actively remove rough fish from the system
would be ongoing, expensive and unlikely to succeed
• DNR believes it may be possible to induce rough fish to leave and largely stay out of backwater lakes following the spring flood pulse if the rough fish sense they will be trapped by lowering water levels
• Any rough fish control ideas to implement the TMDL should be implemented using an adaptive management approach– Conduct initial projects as experiments or pilot efforts – Implement future efforts based on the success (or failure) of the
initial efforts
55
Rural and Urban BMPs• Rural BMPs
– Conservation Tillage– Filter Strips– Riparian Buffers– Grade Stabilization
Structures
• Urban BMPs– Proactive stormwater
management– Future loads from MS4s
should remain equal to or less than current levels
56
Next Steps• Public Meeting: March 2008
• Draft TMDL Report: March/April 2008
• Final TMDL Report: May/June 2008
• Implementation Plan Development
57
Contact Information
Justin Watkins – MPCA(507) [email protected]
Kevin Kratt – Tetra Tech(216) [email protected]