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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

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

  • 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

  • APWA 2016 PWX August 29, 2016

    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]

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 3

    Flooding Hazards  [structural flooding]

    5

    6

    Flooding Hazards  [non‐structural; limiting access]

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 4

    7

    Impaired and Degraded Streams

    8

    Aging and Undersized Infrastructure

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 5

    9

    Failing Infrastructure

    10

    Drainage Complaints

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 6

    11

    Emerging Needs and Opportunities [green infrastructure and rainwater harvesting]

    12

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 7

    13

    Leadership + Vision + Resources + Teamwork

    14

    Leadership + Vision + Resources + Teamwork

  • APWA 2016 PWX August 29, 2016

    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

  • APWA 2016 PWX August 29, 2016

    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 1Flood Hazard Reduction Benefits 13.6 2Regulatory Mandates & Compliance  12.9 3Water Quality Benefits 11.3 4Watershed Management Benefits 10.2 5Stormwater Infrastructure Asset Management Benefits 9.9 6Community Support & Implementation Complexity  9.3 7Resource Leveraging Opportunities 8.6 8Indirect Community Benefits 7.2 9

    Sum = 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 ProjectsPrimary 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 wellPotential grant funding opportunityPotential mitigation credit opportunityPriority Perry Creek TMDL watershed

    Stage of Project    (Preliminary, Budgeted, Active, Complete) PreliminaryWater 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: 9/30/2015Evaluation 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

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 10

    Model Highlights

    19

    Project information

    Model Highlights

    20

    9 Integrated Prioritization Criteria

    • Defined by sub‐criteria• 25 total scoring metrics

  • APWA 2016 PWX August 29, 2016

    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

  • APWA 2016 PWX August 29, 2016

    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 Project

    Primary 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 Cost

    Watershed Area Served by Project Cost / Area Served

    Number of Parcels Directly 

    ImpactedCost / Parcel(s) Directly 

    ImpactedAnnual TN Pollutant 

    Load Reduced Cost / TN ReducedAnnual 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 Project

    Primary 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 Cost

    Watershed Area Served by Project Cost / Area Served

    Number of Parcels Directly 

    ImpactedCost / Parcel(s) Directly 

    ImpactedAnnual TN Pollutant 

    Load Reduced Cost / TN ReducedAnnual 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 Project

    Primary 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

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 13

    Model Highlights

    25

    Outputs?[Scores and other information to support decision making] 

    Project ID Number Project Name

    General Category of Project

    Primary 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 Cost

    Watershed Area Served by Project Cost / Area Served

    Number of Parcels Directly 

    ImpactedCost / Parcel(s) Directly 

    ImpactedAnnual TN Pollutant 

    Load Reduced Cost / TN ReducedAnnual 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 

    ImpactedCost / Parcel(s) Directly 

    ImpactedAnnual TN Pollutant 

    Load Reduced Cost / TN ReducedAnnual 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

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 14

    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

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 15

    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

  • APWA 2016 PWX August 29, 2016

    City of Raleigh Stormwater Management Program 16

    Thanks

    31

    Dale Hyatt

    Outline

    Background for Model  [Why?]

    Stakeholder Team Collaboration[Keys to the Model]

    Model Implementation 

    Q&A

    32

  • APWA 2016 PWX August 29, 2016

    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]

    33

  • APWA 2016 PWX 8/18/2016

    1

    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

  • APWA 2016 PWX 8/18/2016

    2

    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.

  • APWA 2016 PWX 8/18/2016

    3

    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.

  • APWA 2016 PWX 8/18/2016

    4

  • APWA 2016 PWX 8/18/2016

    5

    • 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.

  • APWA 2016 PWX 8/18/2016

    6

  • APWA 2016 PWX 8/18/2016

    7

    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 DatabaseIssues:• Multiple lakes with same name• Many unnamed creeks• Need to see where in relation impaired water is to our R/W

  • APWA 2016 PWX 8/18/2016

    8

    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            YESMnDOT WLA Met    NOMnDOT Drain To      YES

    List in SWPPP* and see if you can provide extra treatment.  

    ORANGE

    MnDOT WLA            NO, TBDMnDOT WLA Met    NO, TBD, NAMnDOT Drain To     YES, TBD

    List in SWPPP* if MnDOT has drainage to the impaired water.

    YELLOW

    MnDOT WLA            YESMnDOT WLA Met    YESMnDOT Drain To      YES

    List in SWPPP*.

    GREEN

    MnDOT WLA             NAMnDOT WLA Met     NAMnDOT 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, [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 Coalition2. California Stormwater Quality Association3. Central Massachusetts Regional Stormwater Coalition4. Ohio Stormwater Association5. Tennessee Stormwater Association6. Indiana Association for Floodplain and Stormwater Management 7. Iowa Stormwater Education Partnership8. Virginia Municipal Stormwater Association9. Arizona stormwater outreach for regional municipalities10. 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]

    10827 Public Works Stormwater Summit Day One Stormwater Asset Management Strategies and Tools (Bryant)10827 Public Works Stormwater Summit Day One Stormwater Asset Management Strategies and Tools (Loida)