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Metropolitan Council. Environmental Services. Info Item : Infiltration/Inflow Mitigation Program. Metropolitan Council Environment Committee November 8, 2011. Kyle Colvin, Assistant Manager, Engineering Services. A Clean Water Agency. Presentation Outline. I/I Surcharge Program Overview

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slide1

Metropolitan Council

Environmental Services

Info Item: Infiltration/Inflow Mitigation Program

Metropolitan Council Environment Committee

November 8, 2011

Kyle Colvin, Assistant Manager, Engineering Services

A Clean Water Agency

presentation outline
Presentation Outline
  • I/I Surcharge Program Overview
    • Task Force Recommendations
    • Measured Excessive Peak Events
    • Communities with I/I Work Plans
    • Qualified Work & Expenses
    • Total Regional Work Efforts
  • On-going I/I Mitigation Program
    • Task Force Recommendations
    • Revised Water Resources Management Policy Plan
    • Similarities and Differences to 2007 Surcharge Program
    • Determination of Peak Flow Thresholds or “Goals”
    • Implementation Schedule
2004 task force
2004 Task Force
  • Findings
  • Sufficient capacity with normal I/I to accommodate future growth.
  • At current levels of excessive I/I, future regional growth cannot be accommodated without extensive system capacity expansion.

Cost for additional regional system capacity: $900 Million

Mitigation “Excess” I/I at local level: $150 Million

2004 task force1
2004 Task Force
  • Recommendations
  • MCES design standard for peak flow allowance is reasonable and its use should continue.
  • Communities with excessive I/I should be accountable for excess costs to regional system.
  • MCES must pursue strategy of I/I flow reduction rather than system expansion.
  • Council shall implement a Demand Charge in 2013 for continued excessive I/I flow to system.
2007 i i surcharge program
2007 I/I “Surcharge Program”
  • June 2004 -June 2010: Monitoring for excess I/I
  • 2007-2011: Communities implement I/I mitigation plans
  • 2012: Council extends deadline for completing work
    • Two communities take advantage of additional year
  • Community given choice to implement I/I mitigation plan vs. Surcharge
  • Capped Surcharge Communities
    • Additional time given to complete work if cost of mitigation plan exceeds 25% of their annual Municipal Wastewater Charge
    • Five communities apply for cap extension, one completes work early
regional wastewater summary
Regional Wastewater Summary

Surcharge based on excess MGD peak only @ $384,000 per MGD (Estimated 2013 Rate).

Hourly Metered Flow

3-year Average

i i excessive communities
I/I Excessive Communities

Arden Hills Maplewood St. Anthony

Bayport Medicine Lake St. Bonifacius

Bloomington Medina St. Louis Park

Chanhassen Mendota St. Paul

Chaska Minneapolis Stillwater

Columbia Heights Minnetonka Tonka Bay

Eagan Minnetonka Beach Vadnais Heights

Eden Prairie Mound Waconia

Edina New Brighton West St. Paul

Excelsior New Hope

Farmington Newport

Golden Valley Oakdale

Greenwood Orono

Hopkins Osseo

Lakeville Plymouth

Lauderdale Roseville

LilydaleSavage

Long Lake Shoreview

Maple Plain South St. Paul

Summary

Total: 47 Communities

local mitigation efforts
Local Mitigation Efforts

Public Infrastructure

  • Investigative studies, system modeling, inspections, etc.
  • Pipe line rehabilitation/replacement
  • MH and lift station wet well rehabilitation
  • Storm water control projects

Private Property

  • Cross connection discovery and disconnection
  • Sump pump/foundation drain disconnection program
  • Rain leader disconnection program
  • Service line inspection/repair/replacement
local reported expenses
Local Reported Expenses
  • 2010 figure includes $52 million reported expenses from Minneapolis for work completed in 2004-2010.
  • 2011 Expense documentation from communities due to Council by 3/31/12. Figure based on work plans for 2011.
mitigation effort results
Mitigation Effort Results
  • 2006-2010 Dry Climate Period characterized by lower ground water tables and fewer intense snowmelt/rainfall events.
  • Complexity of rainfall events & response analysis
  • Lowered annual goal/threshold due to lower 3-year flow average
mitigation effort results1
Mitigation Effort Results
  • 2006-2010 Dry Climate Period characterized by lower ground water tables and fewer intense snowmelt/rainfall events.
  • Complexity of rainfall events & response analysis
  • Lowered annual goal/threshold due to lower 3-year flow average
mitigation effort results2
Mitigation Effort Results
  • 2006-2010 Dry Climate Period characterized by lower ground water tables and fewer intense snowmelt/rainfall events.
  • Complexity of rainfall events & response analysis
  • Lowered annual goal/threshold due to lower 3-year flow average
mitigation effort results3
Mitigation Effort Results
  • 2006-2010 Dry Climate Period characterized by lower ground water tables and fewer intense snowmelt/rainfall events.
  • Complexity of rainfall events & response analysis
  • Lowered annual goal/threshold due to lower 3-year flow average
mitigation effort results4
Mitigation Effort Results
  • 2006-2010 Dry Climate Period characterized by lower ground water tables and fewer intense snowmelt/rainfall events.
  • Complexity of rainfall events & response analysis
  • Lowered annual goal/threshold due to lower 3-year flow average
mitigation effort results5
Mitigation Effort Results
  • 2006-2010 Dry Climate Period characterized by lower ground water tables and fewer intense snowmelt/rainfall events.
  • Complexity of rainfall events & response analysis
  • Lowered annual goal/threshold due to lower 3-year flow average
2010 demand charge task force
2010 Demand Charge Task Force
  • Created in 2010 to address need for implementation of Demand Charge in 2013
  • Report Recommendations
    • Delay implementation of a Demand Charge
    • Develop and implement on-going I/I program
    • Continue to determine allowable I/I by metershed using peaking factors.
  • Council Actions
    • Sept. 8, 2010 – Amend Water Resources Management Policy Plan
    • Changes implementation of demand charge from specified year start to a “trigger” criteria.
    • Sept. 22, 2010 – Demand Charge Task Force Report
    • Accepts DCTF report
    • Authorize staff to implement procedures for “On-going” I/I reduction Program.
on going program comparison to surcharge program
On-going Program Comparison to Surcharge Program

4-Year

5-Year

On-going

5-Year (sunset)

Yes

No

10-Years

3-Years

Yes

No

on going i i program
On-going I/I Program
  • Adjustment for Growth
  • Estimated Flow from growth within 10-year rolling period
  • Add 50% of Growth flow to 10-year average flow
  • Adjustment for Water Conservation & I/I Mitigation Work
  • Estimated flow reduction within 10-year rolling period that is not reflected in 10-year average
  • Add 10% (1% per year of 10-year rolling avg.) to 10-year average flow.
on going i i program1
On-going I/I Program
  • Adjustment for I/I into Council Interceptors
  • Estimated peak flow reduction to individual exceedances based on existence of interceptors within communities.
  • Reduction based on proportion of regional wastewater system size & length to total wastewater system size & length (local + regional).

Example

Peak Hourly exceedance would be reduced by 0.32 MGD

on going i i program2
On-going I/I Program
  • Implementation Schedule
  • November/December – Communities notified of goals/thresholds

Jan. 1, 2012 - June 30, 2012 July 1, 2012 - June 30, 2013

(Peak Flow Measurement) (Peak Flow Measurement)

2013 2014

(Community Work Plans) (Community Work Plans)

  • MCES continual effort to assess program effectiveness
questions
Questions

Kyle Colvin

Engineering Services Group

651-602-1151

kyle.colvin@metc.state.mn.us

http://www.metrocouncil.org/environment/ProjectTeams/documents/DemandChargeTaskForce_Final%20Report_September%202010.pdf