adaptive management planning for the city of lodi · msa professional services, inc. | more ideas....
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Wisconsin Wastewater Operators Association
49th Annual Conference
October 8, 2015 | Pat Morrow, P.E.
Adaptive Management Planning for the City of Lodi
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Overview
» Background
» Preparation of Adaptive Management Plan
» Outreach Website Development
» Q & A/Discussion
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» Lodi’s WPDES Permit Phosphorus Limits
• Current: 1 mg/L P
• Future: 0.075 mg/L P
Background
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Background
WPDES Permit Compliance Schedule
Submit Operations and Needs Review December 31, 2012
Submit Facilities Planning Status Report December 31, 2013
Submit Facility Plan December 31, 2014
Refine Facility Plan December 31, 2015
Construction Plan Submittal* July 30, 2016*
Future Permit Requirements
Comply with 0.075 mg/L Phosphorus Limits* September 30, 2020*
* Items apply if upgrading the WWTF was the selected compliance option
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VS.
Wisconsin Phosphorus Rules
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» Adaptive Management (AM)
• Focus is on stream compliance by 2037 (20 years)
• Spring Creek very close to limit (2011, 2012 data)
• P reductions needed
~ 600 lbs/year @current flow and A.M. interim limit
~ 900 lbs/year @ design flow and A.M. interim limit
Adaptive Management
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Site Name
Year
LS05LS04LS03LS02LS01
2012201120122011201220112012201120122011
250
200
150
100
50
TP
(u
g/
L)
75
Boxplot of TP (May 1st - October 31st)
Lodi WWTF
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Preparation of Adaptive Management Plan
Summary of Year 4 Activities
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Timeline
» Spring/Summer 2015
• Installed automated sampling equipment for storm events
• Began storm event sampling Continue through at least fall 2016
• Staff began bi-weekly grab sampling, upstream and downstream of WWTF outfall
• Prioritize BMPs – both hard and soft practices
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Timeline
» Fall/Winter 2015
• Data analysis and review
Quantify Impacts from the Lodi Marsh
Quantify P-loading at the WWTF
• Further meetings with landowners
• Model Development and Refinement
Urban inputs – WinSLAMM
Watershed – DNR’s SWAT model refinements
BMPs – SnapPlus for select locations
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» Two ISCO automated
samplers purchased and installed • Outlet of Lodi Marsh
• Downstream of WWTF outfall
» Use storm event sampling and baseflow sampling to estimate P-loading • How much does Lodi Marsh
contribute relatively?
• Validity of BMPs upstream?
Automated Sampling Equipment for Storm Events
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Sampler Installation May 14th, 2015
WWTF
ISCO automated sampler 24 bottles, 8 currently collected per rain event
Pressure Transducer
Records continuous water level depth (ft)
Tipping bucket rain gage
Sensitive to 0.1 mm rainfall
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Sampler Installation May 14th, 2015
Lodi Marsh, along Hwy 60
ISCO automated sampler 24 bottles, 8 currently collected per rain event
Pressure Transducer
Records continuous water level depth (ft)
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Preliminary Data Through September 18th
» WWTF
• ISCO triggered 10 times
• All were rain events
• Two interruptions in water level data collection
ISCO’s accidentally turned off (May)
Squirrel chewed through power lines (June)
• Natural diurnal pattern is evident
Stream level is lower during the day
Stream level is higher at night
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Preliminary Data though Sept 18th
» Lodi Marsh
• ISCO triggered 7 times
• Same diurnal pattern
• 2 events are due to diurnal water level variation
• 5 were rain events
• 6 events analyzed for P-concentrations
• No breaks in water level depth data collection
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9
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WWTP - Event Marsh - Event Marsh - Diurnal WWTF Grab -
Upstream WWTF Grab - Downstream
Average 0.199 0.243 0.121 0.087 0.091
Median 0.148 0.225 0.113 0.084 0.082
Min 0.060 0.099 0.051 0.045 0.066
Max 1.770 0.745 0.241 0.133 0.12
Number of samples
82 31 27 9 9
2015 Sample Results - Summary
Revised Estimate of P reductions needed based on the above ~ 1000 lbs/year @current flow and A.M. interim limit ~ 1400 lbs/year @ design flow and A.M. interim limit
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Sampling/Modeling continues…
» Continue sampling efforts
» HEC-RAS model
• Establish rating curves
• Predict flow rate based on water level
» Flowmeter measurements
• Verify model output
Photo credit: State of Washington, Dept of Ecology
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Hard Practice Priority Areas
Building Upon CCLWCD’s 2014 Livestock
Inventories
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Columbia County’s Inventory – Original 31 Sites
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Establishment of Top 20 Priority Sites
Load Reduction = 1170 lb/yr
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Refinement – Top 7 Priority Sites
Load Reduction = 860 lb/yr Construction Cost = $435,000 - $545,000 Construction Cost/lb* = $25 - $32 *construction costs by CCLWCD; 20-yr life
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Soft Practice Priority Areas
Erosion Vulnerability Assessment for
Agricultural Lands (EVAAL) Model
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EVAAL
» WDNR model to identify areas potentially vulnerable to stormwater erosion
» Based on Universal Soil Loss Equation and Stream Power index
» Removes internally drained areas
» Uses publically available GIS data (land use)
» Creates an index specific for the watershed
http://dnr.wi.gov/topic/nonpoint/evaal.html
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Soft Practices
» Many locations far from barnyards
» Many are in a typical dairy rotation
» Potential for strip tillage, manure injection, cover crops
» Harvested Buffer Program to be investigated
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Combined Priority Areas
BARNY modeling in tandem with EVAAL
modeling
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Identify combined priority areas
» Overlay Barnyard Assessments with EVAAL’s erosion vulnerability index
» Landowners where both hard and soft practices may be feasible
» Reduce number of landowner agreements
» Reach P-reduction goals more efficiently
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Low Medium High
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Public Outreach Materials
» Story Map • Dynamic, online content describes the project
• Encourages public participation and engagement
• General information about Adaptive Management and provides links to outside resources
• Available via City website
http://arcg.is/1EeERtb
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Next Steps
» Data collection & analysis
• Diurnal Patterns and phosphorus concentrations
• Quantify Impacts from the Lodi Marsh
• Quantify P-loading at the WWTF
» Further meetings with landowners
» Model Development and Refinement
• Urban inputs – WinSLAMM
• Watershed – DNR’s SWAT model refinements
• BMPs – SnapPlus for select locations
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Questions?
Photo credit: Lodivalleynews.com