Stormwater Technology Testing Center (STTC)

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Ernest Davidson
5 years ago
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1 (STTC) Paul R. Wirfs, PE Oregon DOT John Lenth Herrera, Inc 1

2 Stormwater What and Why Stormwater There is a lot going on.... 2

3 Stormwater Treatment - Engineering in many forms.. Stormwater Treatment Technologies 6 3

4 Stormwater Treatment Technologies Stormwater Treatment Technologies Inlet Access Hatch Riser Outlet Separation Chamber Separation Screen Optional Basket 8 4

5 Stormwater Treatment Technologies Stormwater Treatment Technologies 5

6 Stormwater Treatment Technologies 11 Stormwater Treatment Technologies 12 6

7 Stormwater Treatment Technologies 13 Stormwater Treatment Technologies 14 7

8 Stormwater Treatment Technologies 15 Stormwater Treatment Technologies 16 8

9 Stormwater Treatment Technologies 17 Stormwater Treatment Why do we do it? Clean Water Act NPDES Permit Requirements Protect the Environment Protect Aquatic Species Protect Drinking Water 18 9

10 Stormwater Treatment Who is Responsible? Owners & Operators of Facilities Government Agencies Commercial Businesses Home Owner Associations 19 Stormwater Technology Testing Center History 10

Informal Gathering of Gov Stormwater Professionals Common Challenges Literature Search / Interviews Identified Needs Maintainability information

test/evaluate SW treatment systems Began development in 2011 21 Goals The STTC will be used for testing stormwater treatment systems for their

11 Informal Gathering of Gov Stormwater Professionals Common Challenges Literature Search / Interviews Identified Needs Maintainability information Sustainable Business Model ODOT Stormwater Retrofit Program Maintainability Evaluation for Stormwater Treatment Systems Site development to test/evaluate SW treatment systems Began development in Goals The STTC will be used for testing stormwater treatment systems for their effectiveness and maintainability. Provide a cost effective site for evaluating effectiveness. Provide maintainability data. Provide life-cycle cost data

12 Business Plan Maintainability Metrics / Protocols Quality Assurance Project Plan (QAPP) Board of Directors Site Selection Site Design Site Construction Development Steps 23 Coordination Washington Department of Ecology s Technology Assessment Protocol Ecology (TAPE) guidelines Stakeholder Group 24 12

ODOT Clean Water Services Stakeholder Involvement City of Portland (Bureau of Environmental Services) Other state and local governments Stormwater Equipment Manufactures Association Other

13 ODOT Clean Water Services Stakeholder Involvement City of Portland (Bureau of Environmental Services) Other state and local governments Stormwater Equipment Manufactures Association Other testing protocol organizations Washington State Department of Ecology Washington Stormwater Center Facilitated a stakeholder meeting - Jan 26, Stormwater Technology Testing Center 13

Final Business plan April 2013 27 Contents Organization

14 Development Examined 12 existing business and service models Utilized Stakeholder Input Draft business plan February 2013 Final Business plan April Contents Organization Market Analysis Service / Operational Plan Financial Plan 28 14

15 Organizational Structure 29 Operation STTC Board will select an entity to operate the center. The Operator will provide: Administration Operation Technology Testing Resource Management Marketing 30 15

Stormwater Technology Testing Center Protocols 2011 TAPE protocol Applicant must provide available data on O&M requirements Testing must evaluate bypass

16 Stormwater Technology Testing Center Protocols 2011 TAPE protocol Applicant must provide available data on O&M requirements Testing must evaluate bypass frequency if possible Verify sizing correct Verify applicants claims regarding maintenance Accumulated sediment sampling where feasible Background 32 16

17 2011 TAPE protocol Background No evaluation of maintenance and life-cycle costs No evaluation of required level of effort for maintenance 33 Stormwater Technology Testing Center Maintainability Protocols 17

runoff to the system Monitoring influent discharge and chemistry Halt testing at maintenance threshold Hydraulic capacity reduced to

18 Approach Step 1: Test Baseline Solids Loading Step 2: Determine maintenance needs Step 3: Calculate baseline maintenance cycle Step 4: Calculate lifecycle maintenance costs 35 Start with a clean installation STEP 1: Test Baseline Solids Loading Deliver polluted runoff to the system Monitoring influent discharge and chemistry Halt testing at maintenance threshold Hydraulic capacity reduced to 80 percent of design capacity Continue testing to lower threshold as needed Quantify SSC load delivered at maintenance threshold 36 18

16 Maintenance Threshold 14 Flow Rate at Bypass 12 10 8 6 4 Design Flow Rate 2 0 0 10 20 30 40 50 60 70 80 90 100 Suspended Sediment Concentration Loading Fictional data provided for example purposes

19 16 Maintenance Threshold 14 Flow Rate at Bypass Design Flow Rate Suspended Sediment Concentration Loading Fictional data provided for example purposes only 37 Routine Inspection STEP 2: Determine Maintenance Needs Visual inspection, removal of gross solids and debris, sediment depth assessment, inspection of plant health. Routine Maintenance Vactoringsediment from settling chambers, replacing prefilter media, trimming vegetation. System Recharge Vactoringsediment from settling chambers, replacing primary filtration media, replacing plants. Additional Maintenance Actions Unanticipated maintenance procedures (e.g., fixing leaks, adjusting orifice diameters, etc.) 38 19

Step 3: Calculate baseline maintenance cycle Estimate sediment loading rate from hypothetical basin Iteratively size basin using WWHM to deliver design flow for water quality treatment goal Calculate

maintenance threshold 39 Step 4: Calculate lifecycle maintenance costs Estimate annual costs for maintenance activities over a facility life cycle of 20 years.

20 Step 3: Calculate baseline maintenance cycle Estimate sediment loading rate from hypothetical basin Iteratively size basin using WWHM to deliver design flow for water quality treatment goal Calculate annual runoff volume Estimate annual sediment load using Representative TSS concentrations Derive annual maintenance cycle Annual sediment load from hypothetical basin divided by measured load at maintenance threshold 39 Step 4: Calculate lifecycle maintenance costs Estimate annual costs for maintenance activities over a facility life cycle of 20 years. Apply inflation rates for each activity, convert to present values by applying a discount rate. Calculate lifecycle maintenance costs as the net present value (NPV) of total maintenance costs incurred over the facility life cycle of 20 years

21 No Certification or Approval The STTC will NOTcertify or approve systems WDOE Certifies Technologies for TAPE The STTC will only report data 41 Quality Assurance Project Plan (QAPP) Approved by Ecology in May 2015 Allows testing at ODOT facility using a Standardized Test Hydrograph QAPP addenda required for individual technologies 42 21

22 Stormwater Technology Testing Center Site Design & Construction STTC Location: I-205 at Columbia Slough 5 mile long - stormwater collection pipe 44 22

23 Goals Flexibleto test a range of stormwater treatment BMP types, starting with proprietary devices Representativeof hydrologic and water quality conditions in urban stormwater Cost-Effectivefor agencies and equipment manufacturers to evaluate BMP effectiveness Expandable to test more facilities in the future, including potentially testing the effectiveness of traditional stormwater BMPs 45 Site Selection (Additional Criteria) Gravity Flow conveyance of stormwater to facility Discharge Point to an appropriate location Accessmust be Safe and convenient 46 23

24 STTC Location: I-205 at Columbia Slough 1.5 Acre Expansion Area Flexible Representative Cost Effective Expandable 47 Diversion Structure flowlines match! Sand flows both ways at the diversion 48 24

traffic highway and mixed urban Divert flows

Columbia Slough Flows Peak = 25 cfs(1/2 2

inch diversion and 6 foot wet well 49 STTC

25 Site Design Source Stormwater Features Drainage area: ~1,000 acres Land use: high traffic highway and mixed urban Divert flows from 84 inch storm drain along I-205 at Columbia Slough Flows Peak = 25 cfs(1/2 2 yr); 660 cfs(100 yr) Utilize existing 36 inch diversion and 6 foot wet well 49 STTC Location: I-205 at Columbia Slough Access Gate Access Gate 50 25

26 Final Site Design Features Simultaneously test three systems Three 14 X 17 foot test bays Both Gravity and Pumped Conveyance! AODD Pumps = Flow Meters! Positive Displacement PLC counts pump cycles to calculate flow rate 51 Site Layout Stormwater flow path Downward flow-path for sand particles 52 26

27 Under Construction Placing the Wall Blocks 53 Under Construction Inside the Pump Room 54 27

28 Under Construction Hoses in & out of Pump Room In Out 55 Under Construction Getting the Controls Set 56 28

29 Under Construction Nearly Finished 57 Why is the STTC Important? Assists end-users of stormwater treatment technologies. NPDES compliance Life-Cycle information Independent evaluation of technologies 58 29

30 Why Become a STTC Member Agency? Immediate access to maintenance metrics Access to maintenance cost estimating tools. Contribute to independent evaluations Opportunity to influence STTC operations 59 Membership Fees Not yet established by the Board Phase I: Set-Up and Calibration $300,000 total needed $25,000 per contributor (recommended) Phase II: Operation $5,000 per year per member agency (Guess) Additional Members will reduce fees per member 60 30

31 Next Steps Complete Site Construction Secure Funding for Calibration and Start-up Transportation Pooled Fund Research Solicitation (#1397) State Transportation Innovation Council (STIC) Incentive program allocation Agency Membership Board Implement Business Plan Select entity to operate facility Coordinate with STEPP initiative 61 Questions? 31

Stormwater Technology Testing Center (STTC) Presented by: Paul R. Wirfs, PE and Dan Gunther, PE April 2016

Stormwater Technology Testing Center (STTC) Presented by: Paul R. Wirfs, PE and Dan Gunther, PE April 2016 Stormwater There is a lot going on.... Stormwater Treatment - Engineering in many forms.. Stormwater