APWA 2016 PWX August 29, 2016 › library › meetings › pwx › 10827.pdf · APWA 2016 PWX...

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APWA 2016 PWX August 29, 2016 City of Raleigh Stormwater Management Program 1 Developing an Integrated Capital Improvement Project Prioritization Model for Strategic Municipal Stormwater Management Scott D. Bryant, PE Senior Engineer / Strategic Planning City of Raleigh Stormwater Management Program PWX 2016 Stormwater Summit August 29, 2016 2

Transcript of APWA 2016 PWX August 29, 2016 › library › meetings › pwx › 10827.pdf · APWA 2016 PWX...

Page 1: APWA 2016 PWX August 29, 2016 › library › meetings › pwx › 10827.pdf · APWA 2016 PWX August 29, 2016 City of Raleigh Stormwater Management Program 9 Evaluation and ranking

APWA 2016 PWX August 29, 2016

City of Raleigh Stormwater Management Program 1

Developing an Integrated Capital Improvement Project Prioritization Model for Strategic Municipal Stormwater Management

Scott D. Bryant, PESenior Engineer / Strategic Planning

City of Raleigh Stormwater Management Program

PWX 2016 Stormwater Summit 

August 29, 2016

2

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City of Raleigh Stormwater Management Program 2

Outline

Background for Model  [Why?]

Stakeholder Team Collaboration[Keys to the Model]

Model Implementation 

Q&A

3

4

Flooding Hazards  [street flooding]

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City of Raleigh Stormwater Management Program 3

Flooding Hazards  [structural flooding]

5

6

Flooding Hazards  [non‐structural; limiting access]

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City of Raleigh Stormwater Management Program 4

7

Impaired and Degraded Streams

8

Aging and Undersized Infrastructure

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City of Raleigh Stormwater Management Program 5

9

Failing Infrastructure

10

Drainage Complaints

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City of Raleigh Stormwater Management Program 6

11

Emerging Needs and Opportunities [green infrastructure and rainwater harvesting]

12

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City of Raleigh Stormwater Management Program 7

13

Leadership + Vision + Resources + Teamwork

14

Leadership + Vision + Resources + Teamwork

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City of Raleigh Stormwater Management Program 8

Outline

Background for Model  [Why?]

Stakeholder Team Collaboration[Keys to the Model]

Model Implementation 

Q&A

15

Jan – Mar 2015 Stormwater Program/Budget Workshops with City Council

Mar – April Staff Planning / City Strategic Plan Adopted

May 7 SMAC – Project Prioritization Model Kickoff

May ‐ June SMAC Sub‐Committee Workshops #1 ‐ #3

July 9  SMAC – Update & Review Preliminary Model

July 30 SMAC Sub‐Committee Workshop #4

Sept 3 Final Initial Model & Implementation Plan to SMAC

Nov 17, 2015 Update to City Council 

Apply for FY 2017 CIP Budget and beyond

Stakeholder Team Collaboration

16

City Council

Stormwater Management Advisory Commission (SMAC) 

SMAC + Staff Team

Public Input

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City of Raleigh Stormwater Management Program 9

Evaluation and ranking of integrated prioritization model criteria

‐ Pairwise comparisons‐ Consensus on final weights and rankings

17

Summary Results for SMAC + Staff TeamAvg Wt % Avg Rank

Public Safety & Public Health 17.0 1

Flood Hazard Reduction Benefits 13.6 2

Regulatory Mandates & Compliance  12.9 3

Water Quality Benefits 11.3 4

Watershed Management Benefits 10.2 5

Stormwater Infrastructure Asset Management Benefits 9.9 6

Community Support & Implementation Complexity  9.3 7

Resource Leveraging Opportunities 8.6 8

Indirect Community Benefits 7.2 9Sum = 100%

Stormwater Management Advisory Commission + Staff Collaboration

Model Highlights

18

Project Inputs

Project ID Number   (ID Number format is "Program ID‐YEAR‐000x") 210‐2015‐0001

Project Name Upper Durant Lake Stream‐Wetland Restoration

Project Location Durant Nature Preserve

River Basin Neuse River Basin

Watershed  Perry Creek

Sub‐Watershed     (City "Drainage Basin") Perry Creek

Watershed Area Served by Project   (watershed area for the project in ACRES) 3500

Parcels Directly Impacted by Project Improvements, if applicable    (# of parcels) 1

Council District   (A, B, C, D, E) A

Lead Group for Project  Program Admin (209)

General CIP Program Category of Project   (CIP, DA, SWQCS, CIP‐HM, Other) CIP

    CIP Sub‐Category  Water Quality Improvement Projects

Primary Type of Project  Integrated Representative 

Project Scope (Brief Description of Basic Elements; limit to space provided): Restore stream‐wetland system at existing Upper Durant Lake Photo(s):

Partner with City PRCR, possibly PUD as well

Potential grant funding opportunity

Potential mitigation credit opportunity

Priority Perry Creek TMDL watershed

Stage of Project    (Preliminary, Budgeted, Active, Complete) Preliminary

Water Quality Performance Parameters for Project, if applicable:

     Total annual load of TN reduced by project (in lbs TN/year) 950

     Total annual load of TSS reduced by project (in lbs TSS/year) 250000

Project Cost Information:

     Study/Engineering Design Cost, estimate ($) $250,000

     Construction Cost, estimate ($) $1,750,000

     Total Project Cost, computed estimate ($) $2,000,000

Evaluated by: Scott Bryant, PE

     Date of Original Evaluation: 9/30/2015

     Date Evaluation last Updated: 9/30/2015

Evaluation Checked by: Blair Hinkle, PE

     Date Evaluation last Checked:

Basic Eligibility Criteria Yes          No          N/A                            

B1.  Project located within corporate limits of Raleigh YES

B2.  Project receives and/or conveys public runoff* YES

B3.  Project is compatible with City Strategic Plan + Comprehensive Plan YES

B4.  For DA and SWQCS projects ONLY, petitioner(s) utility fee payment(s) current Not Applicable

        [*Stormwater Quality Cost Share (SWQCS) projects are the only exception to B2]

Integrated Prioritization Criteria                                                                                                         [Criteria Scoring Metrics] [Criteria Weights] [Criteria Scores]

Public Safety and Public Health 0                                                                                               5                                                                                                           10 17.0 6

        PSH 1.     Threat to human life No identifiable threat (0)                                                               Intermediate threat (5)                                                                                         High/imminent threat (10) 100% 6        PSH 2.     Threat to emergency access/critical location 

        PSH 3.     Other (non‐life) threat to public safety/health

Flood Hazard Reduction Benefits 0                                                                                               5                                                                                                           10 14.0 4.0

        FHR 1.     Street Flooding No street flooding (0)                                                      Intermediate street flooding (5)                                                                  Major street flooding (10) 50% 4

        FHR 2.     Structural Flooding  No structural flooding (0)                                             Intermediate structural flooding (5)                                                     Major structural flooding (10) 40% 4

        FHR 3.     Non‐Structural Flooding  No non‐structural flooding (0)                           Intermediate non‐structural flooding (5)                                           Major non‐structural flooding (10) 10% 4

Regulatory Mandates and Compliance  0                                                                                               5                                                                                                           10 13.0 10

        RMC 1.     NPDES MS4 Stormwater Permit/Stormwater Management Program  No regulatory mandate (0)                                  Intermediate mandate/compliance (5)                                 High priority mandate/compliance (10) 100% 10        RMC 2.     Other Local, State, Federal Regulatory Programs

Water Quality Benefits 0                                                                                               5                                                                                                           10 11.5 9.3

        WQ 1.     Priority Water Quality Area   Non‐priority WQ area (0)                                                    303(d) listed as impaired waters (5)                                               Within Priority WQ Target Area (10) 33% 10

        WQ 2.     Pollutant Treatment/Pollutant Load Reduction benefits   No pollutant treatment/load reduction benefits (0)                                                                                         Significant treatment/load reduction benefits (10) 33% 9

        WQ 3.     Erosion/Sediment Control/Sediment Load Reduction benefits  No erosion/sediment control benefits (0)                                                                                                               Significant erosion/sediment control benefits (10) 33% 9

Watershed Management Benefits 0                                                                                               5                                                                                                           10 10.0 7.8

        WM 1.     Stream system/riparian area functional benefits  No significant stream/riparian/floodplain benefits (0)                                          Stream‐riparian‐floodplain restoration/functional uplift (1 ‐ 10) 25% 8

        WM 2.     Protect/restore floodplain functions

        WM 3.     Protect/restore natural hydrologic conditions No hydrologic benefits (0)                                 Hydrologic protection/restoration benefits (3 ‐ 9)                              Fully restores natural hydrology (10) 25% 8

        WM 4.     Linkage to watershed/basin master plan/phased system improvements No linkage to master plan or not recommended (0)                                           Linkage to master plan/phased system improvements (1, 5 or 10)  25% 10

        WM 5.     Known stormwater problem area/valid complaints history No known SW problems/complaints (0)                                                                                                             Significant SW problems/high complaint level (10) 25% 5

Stormwater Infrastructure Asset Management Benefits 0                                                                                               5                                                                                                           10 10.0 7.0

        AM 1.     Infrastructure condition/effective service life New/excellent condition (0)                                            Intermediate/fair condition (5)                                                                   Poor/failing condition (10) 25% 8

        AM 2.     Infrastructure capacity/level of service Full LOS/capacity (0)                                                        Intermediate LOS/capacity (5)                                                                             Poor LOS/capacity (10) 25% 6

        AM 3.     Consequence/risk of infrastructure failure Low risk/low consequence (1)                                 Intermediate risk/consequence (5)                                                  High risk/high consequence (10) 25% 7

        AM 4.     Infrastructure asset operation & maintenance benefits/cost savings No O&M benefits (0)                                                               Intermediate O&M benefits (5)                                                                           High O&M benefits (10) 25% 7

Community Support and Implementation Complexity  0                                                                                               5                                                                                                           10 9.0 9.5

        CSIC 1.     Level of community support/acceptance  Low level of support (1)                                                    Intermediate level of support (5)                                                               High level of support (10) 25% 10

        CSIC 2.     Right‐of‐Way (ROW)/Easement availability Easements required (0 ‐ 9)                                                                                                                                                               All existing Public ROW/Public Land (10)  25% 10

        CSIC 3.     Project regulatory permitting/mitigation requirements Di ffi cul t to permit/high mitigation (0)                              Typical permitting/no mitigation required (5)                        Desirable permitting/mitigation credit (10) 25% 8

        CSIC 4.     Public and private utility impact/relocation considerations High level of utility impacts (0)                                         Typical level of utility impacts (5)                                                                  No utility impacts (10) 25% 10

Resource Leveraging Opportunities 0                                                                                               5                                                                                                           10 8.5 5.0

        RL 1.     Grant funding opportunity  No external funding (0)        Beneficial loan opp. (1 ‐ 2)           Intermediate external funding, 25% (5)               High external funding, 50%+ (10) 100% 5

        RL 2.     Public‐private (non‐City) funding partnership opportunity 

        RL 3.     Attractive/beneficial loan funding opportunity 

Indirect Community Benefits 0                                                                                              5                                                                                                           10 7.0 8.5

        ICB 1.     Leading/innovative Stormwater Management (SWM) practice Typical/routine SWM practice (0)                                            Partially innovative (5)                                     Fully leading/innovative SWM practice (10) 25% 7

        ICB 2.     Integral public educational opportunity No integral public educ (0)                                               Limited integral public educ (5)                                              High level of integral public educ (10)  25% 10

        ICB 3.     Opportunity to collaborate area improvements with other department(s) Not applicable (0)                                                     Intermediate collaborative opportunity (5)                                         Major collaborative opportunity (10)                25% 10

        ICB 4.     Level of consistency with City Strategic Plan + Comprehensive Plan Not inconsistent  (1)                                                         Intermediate level of consistency (5)                                                   High level of consistency (10) 25% 7

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Model Highlights

19

Project information

Model Highlights

20

9 Integrated Prioritization Criteria

• Defined by sub‐criteria

• 25 total scoring metrics

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City of Raleigh Stormwater Management Program 11

Scoring Metrics Example   [Flood Hazard Reduction]

Model Highlights

21

7 5 3

Scoring Metrics Example   [Asset Management]

Model Highlights

22Table AM 3 adapted from:

8 5

7

10

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City of Raleigh Stormwater Management Program 12

Model Highlights

23

Outputs?

[Scores and other information to support decision making] 

Project ID 

Number Project Name

General 

Category 

of ProjectPrimary Type of 

Project Sub‐Watershed

Council 

District

Total 

Project 

Score 

(TPS)

Safety 

Criticality 

Score      

(SCS)

Mission 

Criticality 

Score       

(MCS) Lead Group for Project

Study and/or 

Engineering 

Design Cost Construction Cost Total Project CostWatershed Area 

Served by Project Cost / Area Served

Number of 

Parcels Directly 

Impacted

Cost / Parcel(s) Directly 

Impacted

Annual TN Pollutant 

Load Reduced Cost / TN Reduced

Annual TSS Pollutant 

Load Reduced Cost / TSS Reduced    Cost‐Score Index

(0 ‐ 100) (0 ‐ 100) (0 ‐ 100) ($) ($) ($) (in Acres) ($/Acre) (# of parcels) ($/# of parcels) (lbs TN/yr) ($/lbs TN/yr) (lbs TSS/yr) ($/lbs TSS/yr) ($/TPS)

210‐2015‐0001 Northshore Lake/Spillway Rehab/Wetland CIP Integrated Marsh Creek B 73.39 100.00 91.74 Infrastructure (210) $375,000 $4,091,722 $4,466,722 850.0 5,255 26 171,797 811 5,508 205,304 22 60,861

Model Highlights

24

Outputs?

[Scores and other information to support decision making] 

Project ID 

Number Project Name

General 

Category 

of ProjectPrimary Type of 

Project Sub‐Watershed

Council 

District

Total 

Project 

Score 

(TPS)

Safety 

Criticality 

Score      

(SCS)

Mission 

Criticality 

Score       

(MCS) Lead Group for Project

Study and/or 

Engineering 

Design Cost Construction Cost Total Project CostWatershed Area 

Served by Project Cost / Area Served

Number of 

Parcels Directly 

Impacted

Cost / Parcel(s) Directly 

Impacted

Annual TN Pollutant 

Load Reduced Cost / TN Reduced

Annual TSS Pollutant 

Load Reduced Cost / TSS Reduced    Cost‐Score Index

(0 ‐ 100) (0 ‐ 100) (0 ‐ 100) ($) ($) ($) (in Acres) ($/Acre) (# of parcels) ($/# of parcels) (lbs TN/yr) ($/lbs TN/yr) (lbs TSS/yr) ($/lbs TSS/yr) ($/TPS)

210‐2015‐0001 Northshore Lake/Spillway Rehab/Wetland CIP Integrated Marsh Creek B 73.39 100.00 91.74 Infrastructure (210) $375,000 $4,091,722 $4,466,722 850.0 5,255 26 171,797 811 5,508 205,304 22 60,861

Project ID 

Number Project Name

General 

Category 

of ProjectPrimary Type of 

Project Sub‐Watershed

Council 

District

Total 

Project 

Score 

(TPS)

Safety 

Criticality 

Score      

(SCS)

Mission 

Criticality 

Score       

(MCS)

(0 ‐ 100) (0 ‐ 100) (0 ‐ 100)

210‐2015‐0001 Northshore Lake/Spillway Rehab/Wetland CIP Integrated Marsh Creek B 73.39 100.00 91.74

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Model Highlights

25

Outputs?

[Scores and other information to support decision making] 

Project ID 

Number Project Name

General 

Category 

of ProjectPrimary Type of 

Project Sub‐Watershed

Council 

District

Total 

Project 

Score 

(TPS)

Safety 

Criticality 

Score      

(SCS)

Mission 

Criticality 

Score       

(MCS) Lead Group for Project

Study and/or 

Engineering 

Design Cost Construction Cost Total Project CostWatershed Area 

Served by Project Cost / Area Served

Number of 

Parcels Directly 

Impacted

Cost / Parcel(s) Directly 

Impacted

Annual TN Pollutant 

Load Reduced Cost / TN Reduced

Annual TSS Pollutant 

Load Reduced Cost / TSS Reduced    Cost‐Score Index

(0 ‐ 100) (0 ‐ 100) (0 ‐ 100) ($) ($) ($) (in Acres) ($/Acre) (# of parcels) ($/# of parcels) (lbs TN/yr) ($/lbs TN/yr) (lbs TSS/yr) ($/lbs TSS/yr) ($/TPS)

210‐2015‐0001 Northshore Lake/Spillway Rehab/Wetland CIP Integrated Marsh Creek B 73.39 100.00 91.74 Infrastructure (210) $375,000 $4,091,722 $4,466,722 850.0 5,255 26 171,797 811 5,508 205,304 22 60,861

Cost / Area Served

Number of 

Parcels Directly 

Impacted

Cost / Parcel(s) Directly 

Impacted

Annual TN Pollutant 

Load Reduced Cost / TN Reduced

Annual TSS Pollutant 

Load Reduced Cost / TSS Reduced    Cost‐Score Index

($/Acre) (# of parcels) ($/# of parcels) (lbs TN/yr) ($/lbs TN/yr) (lbs TSS/yr) ($/lbs TSS/yr) ($/TPS)

5,255 26 171,797 811 5,508 205,304 22 60,861

Outline

Background for Model  [Why?]

Stakeholder Team Collaboration[Keys to the Model]

Model Implementation 

Q&A

26

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Each sectional team uses the model to help envision, identify, and evaluate potential projects on an ongoing basis 

On a regular quarterly basis ‐ projects evaluated and reviewed at sectional levels are placed into an integrated master portfolio of potential CIP projects 

The developing CIP Portfolio is reviewed and vetted by the cross‐sectional CIP Leadership Team

Strategic updates to SMAC culminating in annual CIP program budget recommendations for official consideration

As a best practice, continual improvement/adaptive management updates to the model are regularly noted, discussed, and incorporated ahead of the upcoming fiscal calendar year. Updates provided to SMAC and City Council, as appropriate, on any revisions/improvements, etc.

Model Implementation

27

Direct Outcomes Achieved

28

Key Decision Support Tools for Stormwater CIP Planning Process

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Direct Outcomes Achieved

29

Key Decision Support Tools for Stormwater CIP Planning Process

• Heightened Program Transparency and Accountability

• Heightened Program Integration

– encourages team‐based, innovative, and strategic approach to stormwater management

– preferred projects help achieve stormwater quality and quantity goals

– provides framework and priorities for enhanced watershed management 

• Aligned with City Strategic Plan

– leading practice consistent with organizational excellence

– contributing to overall community quality of life and advancing the City of Raleigh

Larger Stormwater Program Benefits

30

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Thanks

31

Dale Hyatt

Outline

Background for Model  [Why?]

Stakeholder Team Collaboration[Keys to the Model]

Model Implementation 

Q&A

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City of Raleigh Stormwater Management Program 17

For more information

City of Raleigh Stormwater Management Program

Web:Raleighnc.gov search “stormwater”  

Scott Bryant, PESenior Engineer / Strategic [email protected]

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Beth Neuendorf, MnDOT Metro Water Resources Engineer

Barb Loida, MnDOT Metro MS4 Engineer

John Gulliver, University of Minnesota Civil Engineering and St Anthony Falls Laboratory

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Had GIS System to Capture Field Inspections, but not everything in it.

We mapped the rest using As-Builts, Plan Sets,Field Reviews, Video Contracts

Can be displayed on our GIS tool on our iHUB website.

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Clearly lays out BMPS – those apply to all facilities and those unique to that facility.

Lays out responsibilities.

Covers inspections and training that must be done.

Contains a map for stormwater for each facility.

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• Metro area from 2012 list there are 320 impaired waters.  2014 proposed list add 66.

• These waters are listed on EPA’s 303d list.

• Impaired waters require a TMDL study.

• We need to know how this impacts us.

Chloride

Dissolved Oxygen Nutrients

Turbidity

BACTERIA (E.COLI)

Biotic Impairments

These need to address in projects. Bacteria and Chloride are more operational issues.

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Communication between MS4 and WRE Design Staff

• What TMDL?• Where is it?• Do we have a WLA?• What do we need to do about it?

MnDOT has 100’s of project in the Metro area each year.  So question becomes how to communicate TMDL and WLA needs with designers.

1st Attempt

Access Database

Issues:

• Multiple lakes with same name

• Many unnamed creeks

• Need to see where in relation impaired water is to our R/W

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2nd Attempt

• GIS tool on MnDOT’s iHUB website• Used familiar transportation theme – stop 

lights• Allows designers to see where their project is 

in relation to impaired water, what water is impaired for, if we have a WLA, if it is met, and if not, how to address it in the design and Storm Water Pollution Prevention Plan.

What we did?

• Used MPCA’s spatial information from their GIS database and merged it with ours.  

• Went through TMDL reports and added information (do we drain to waterbody, if so, what is our WLA, what % of watershed is ours, what highways drain to it…)

• Have our geodatabase loaded onto Georilla and regularly updated.

• All of this is being done in house.

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Color Data Shows What Extra You Need to Do:

RED

MnDOT WLA            YES

MnDOT WLA Met    NO

MnDOT Drain To      YES

List in SWPPP* and see if you can provide 

extra treatment.  

ORANGE

MnDOT WLA            NO, TBD

MnDOT WLA Met    NO, TBD, NA

MnDOT Drain To     YES, TBD

List in SWPPP* if MnDOT has drainage to 

the impaired water.

YELLOW

MnDOT WLA            YES

MnDOT WLA Met    YES

MnDOT Drain To      YES

List in SWPPP*.

GREEN

MnDOT WLA             NA

MnDOT WLA Met     NA

MnDOT Drain To       No

You don’t have to do anything!

GREY HATCHEDDelisted

You don’t have to do anything, waterbody 

meets state’s WQ standards.

WHITEFor Chloride and E.coli  Check if bridge drainage and see if 

treatment is possible.

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Waiting for Georilla to be Updated

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Impaired waters list updated every two years. And the lists generally take EPA two years to approve.

Each impaired water has may subwatersheds. Still need for designers to look closer at areas since all subwatershed layers are too extensive to put on Georilla.

Need for TMDL studies to show existing loads for all lakes and streams so know what our targets are.

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• Provides an effective tool for communicating between designers and MS4 staff for how to address TMDLs, WLAs and impaired waters in projects.

• Captures project information in our database for our annual MS4 report.

Questions

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Federal funded project, pass through money via the MN Pollution Control Agency.

Competitive process. Joint project between University of Minnesota,

MnDOT and City of Roseville. Funding/Contract 2012.

Iron filings research showed great promise in removing dissolved phosphorus and heavy metals.

A lot of waterbodies in MN classified as impaired for nutrients (phosphorus).

Looking for a more cost effective BMP for small watersheds.

Desire to have something MnDOT Maintenance forces could build.

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Total Phosphorus

Dissolved phosphorus

Phosphate

Dissolved Organic Phosphorus

Particulate Phosphorus

~56%

~4%

~44%

~40%

0.45 μm filter

Filter particulate phosphorus, need to treat for phosphate

Elemental iron rusts => Fe+3 => Reacts with and captures phosphate

Use sand to◦ Filter particles◦ Slow down water to allow contact with iron◦ Keep iron from consolidating

Vertical Iron Enhanced Sand Filters had been successful ~70% iron retention

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(Ahmed et al. 2014)

(Natarajan and Gulliver 2015)

Laboratory prototype◦ Flume tests C33 sand-iron filings media Iron fabric media

Re-design w/ coarser sand-iron media◦ Sand selection D50 = 1.18 mm◦ Column tests for P retention 92.5% Sand + 7.5% Iron

Were existing soil filters

Pink are locations for research

Replaced 2, fixed 1

Green lines ditch flow

Ditch is receiving sheet flow from highway.

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Filter Media – 93% construction sand, 7% iron filings by weight.

Growing media – 1 compost mix, 1peat mix

All rock – washed.

Fencing for cage – coated so we weren’t adding zinc to system.

Impermeable barrier added to trench – could sample.

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Need for covering rip rap – safety issue. Finding fabric that would allow necessary

amount of water through. Media Design – determine size of sand. Getting bags sewn.

Removal of soil at existing ditch block

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Shaping ditch

Trench for filter cage

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Sign crew building cage

Installation of filter bags

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Burrito method

Cage finished with sampling site in and river rock.

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Installation of choker coarse rock

Installation of soil

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Finished with salt tolerant sod

$5,200 for Design and Oversight

$10,000 in Materials

$13,000 for Labor

$13,000 for Equipment

First time we built these – expect costs for building in future go down.

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Go with burrito type system.

No cage

Use only in narrow ditches

Use sources for materials more readily available

Sand-iron filter insert performance◦ Storm events (Summer 2015)◦ Water levels, filter outflow (Dupuit’s equation)◦ Composite WQ Samples Soluble reactive phosphorus (SRP)

Sampling location

**Not drawn to scale**

Instrumentation in Monitoring well

Sampling tube from ISCO sampler

Pressure transducer

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Existing soil berm (without filter insert)

Site 3Existing soil bermDrainage area = 0.22 ha

Stillwater, Washington County, MN

Sampling location

Sand Bag Ditch Block Failed

Proper width and sealing to prevent leakage, flow bypass◦ Re-installation?

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Date Rainfall (cm)

SRP EMCin(µg/L)

SRP Mass Removal Date Rainfall

(cm)SRP

EMCin (µg/L)

SRP Mass Removal

5/3/15 1.13 666 47.1% 6/17/15 2.54 114 35.4%

5/10/15 0.91 885 43.1% 6/22/15 1.24 128 36.6%

5/14/15 1.14 627 36.0% 6/28/15 0.76 283 14.9%

5/17/15 1.02 561 46.2% 6/29/15 1.88 116 40.1%

5/24/15 3.14 1000 53.9% 7/6/15 10.7 218 -10.5%

5/29/15 1.59 417 45.3% 7/28/15 0.79 202 43.1%

6/3/15 1.9 280 36.1% 8/18/15 3.54 274 36.0%

6/11/15 1.08 457 28.2% 8/22/15 4.11 184 -8.70%

6/13/15 1.77 168 41.7%

Mass Removal for 17 events: Mean = 33%; Median = 37%; Cumulative = 35%

SRP: Soluble Reactive PhosphorusEMC: Event Mean Concentration

Date Rainfall (cm)

SRP EMCin(µg/L)

SRP Removal Date Rainfall

(cm)SRP

EMCin (µg/L)

SRP Removal

5/14/15 1.13 486 -29.8% 6/29/15 1.88 181 2.49%

5/29/15 1.59 290 -0.69% 7/6/15 10.7 416 14.2%

6/3/15 1.90 342 -8.2% 7/12/15 6.25 121 -37.2%

6/7/15 2.13 143 -199% 7/18/15 2.36 151 10.7%

6/13/15 1.77 232 15.9% 8/18/15 38 283 -111%

6/20/15 1.22 57.2 -180% 8/22/15 4.11 244 -55.3%

6/22/15 1.24 144 -109%

SRP: Soluble Reactive PhosphorusEMC: Event Mean Concentration

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Assume:• Five iron-enhanced ditch blocks in series, • Equal lengths between the ditch blocks, • Equal inflow off of the slope of the ditch into the ditch

center, • No infiltration in the center of the ditch, and• A 35% retention in each ditch block for phosphate. Then, the concentration coming out of the last ditch block is 33% of the concentration coming inor 67% removal of phosphate

Can improve runoff treatment by roadside ditches

Remove runoff phosphate◦ 35% average reduction

In-series installation for greater reduction Long-term performance and maintenance

needs yet to be investigated◦ Effect of top soil cover

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Received Funds to Monitor for an Additional 3 Years

Questions

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NATIONAL MUNICIPAL STORMWATER ALLIANCE 

(NMSA)

WHO AM I?

Randy Neprash, PE

[email protected]

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OVERVIEW

•Background information on NMSA

•NMSA Action areas

•Current status of NMSA

•NMSA Members

•What’s next?

•Questions

WHAT IS NMSA?

An alliance of state and regional 

groups comprised of MS4 permittees 

that is solely focused on MS4 issues

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PROBLEM STATEMENT

“Stormwater runoff is the only major source of 

water pollution that is increasing in many parts of 

the U.S.; however, stormwater infrastructure is still 

often considered a secondary or ancillary 

infrastructure segment.  In order to meet the 

rising challenge of stormwater pollution, the 

function of stormwater infrastructure must be 

enhanced.”   

MOTIVATION FOR FORMATION

• To represent MS4 permittees at the national level by providing a unified voice

• To lead changes in regulation both proactively and reactively 

• To connect and unite MS4 programs

• To promote stormwater as a resource

• To improve the public image of stormwater 

• To create opportunities for multi‐benefit and multi‐use stormwater projects

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VISION FOR NMSA

• NMSA’s vision is to provide clean water for the 

nation

• This vision will be met through the following 

Supporting Principles:

• Provide efficient programs

• Provide effective programs

• Base decisions on science

OUR ACTION AREAS

• SECTOR SUPPORT AND INFORMATION

• MESSAGING & COMMUNICATION

• EDUCATION

• POLICY/ADVOCACY

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SECTOR SUPPORT AND INFORMATION

• Explore topics and related projects at a national 

scope that are of interest and benefit to MS4s

• Coordinate technology and information transfer at 

the national level between state and regional‐level 

MS4 groups    

• Communicate with member MS4s across multiple 

topics using a variety of information dissemination 

venues and platforms

SECTOR SUPPORT AND INFORMATION

• Coordinate with other national organizations that 

impact the MS4 sector  

• Assist states in managing existing or forming 

new/nascent state and regional‐level groups 

representing MS4 permittees

• Work with WEF member associations in a 

collaborative fashion 

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MESSAGING & COMMUNICATION

• Distribute information about court rulings and 

new rules & regs

• Collect, reformat, generate, and distribute public 

education materials related to MS4 programs and 

policies

• Explore national media campaign(s) to amplify 

public education for stormwater

EDUCATION

• Provide exchange forums for MS4 permittees

• Support & expand public education for 

stormwater

• Provide or support technical reports

• Provide or support guidance manuals

• Host technical forums

• Support member activities and conferences

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POLICY/ADVOCACY

• Speak directly with EPA staff

• Provide a conduit to Federal regulatory and 

legislative contacts of interest to MS4 community

• Provide strategic support on regulatory and 

legislative actions at state/local level

• Provide formal comments on federal regulatory 

proposals from the perspective of MS4 permittees

POLICY/ADVOCACY

• Provide timely communications on pending and 

ongoing regulatory and legislative actions impacting 

the MS4 community

• Provide policy analysis to MS4 community

• Coordinate and work with other national groups to 

amplify messages on MS4 issues

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WHERE WE ARE NOW

• We have incorporated as a 501(c)(3)

• Currently completing the non‐profit establishment phase

• Executive Committee beginning the work of the organization

• Completed a charter and recommendations for the organization

• We have formalized an MOU with WEF and are part of the WEF Stormwater Institute

MEMBER GROUPS

• State/regional groups of MS4 permittees 

independently formed in over 20 states

• Is there a group in your state that we should know 

about?

• These groups provide critical support for MS4 

programs

• Chair and vice‐chair from state‐level groups

• 10 groups currently members of NMSA; in discussion 

with 22 in total

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CURRENT MEMBERS

• Initial stormwater organizations making up the NMSA 

membership:

1. Minnesota Cities Stormwater Coalition

2. California Stormwater Quality Association

3. Central Massachusetts Regional Stormwater Coalition

4. Ohio Stormwater Association

5. Tennessee Stormwater Association

6. Indiana Association for Floodplain and Stormwater Management 

7. Iowa Stormwater Education Partnership

8. Virginia Municipal Stormwater Association

9. Arizona stormwater outreach for regional municipalities

10. Louisiana Urban stormwater coalition

NEXT STEPS

• Continue to engage in outreach to gain new 

members

• Focus on products / initiatives

• Quarterly calls with membership for consistent 

input

• Continue regular engagement with EPA

• Better understand the needs of MS4 permittees 

and articulate them to EPA staff

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GET INVOLVED

• www.nationalstormwateralliance.org

• Leadership:

• Chair:  Randy Neprash, Minnesota Cities 

Stormwater Coalition 

([email protected]

• Vice Chair:  Scott Taylor, California 

Stormwater Quality Association 

([email protected]