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

Transcription

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

2 Stormwater There is a lot going on....

3 Stormwater Treatment - Engineering in many forms..

4 Stormwater Treatment Technologies 4

5 Stormwater Treatment Technologies

6 Stormwater Treatment Technologies Access Hatch Inlet Riser Separation Chamber Outlet Separation Screen Optional Basket 6

7 Stormwater Treatment Technologies 7

8 Stormwater Treatment Technologies

9 Stormwater Treatment Technologies

10 Stormwater Treatment Technologies 10

11 Stormwater Treatment Technologies 11

12 Stormwater Treatment Technologies 12

13 Stormwater Treatment Technologies 13

14 Stormwater Treatment Technologies 14

15 Stormwater Treatment Technologies 15

16 Stormwater Treatment Technologies 16

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

18 Stormwater Treatment Who is Responsible? Owners & Operators of Facilities Government Agencies Commercial Businesses Home Owner Associations 18

19 History (S T T C) 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

20 The STTC s mission is to verify the operation and maintenance performance and life cycle costs of stormwater treatment technologies that have the potential to improve and protect water quality. Mission 20

21 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. 21

22 Development Steps Business Plan Maintainability Metrics / Protocols Quality Assurance Project Plan (QAPP) Board of Directors Site Selection Site Design Site Construction 22

23 Coordination Washington Department of Ecology s Technology Assessment Protocol Ecology (TAPE) guidelines Stakeholder Group 23

24 Stakeholder Involvement ODOT Clean Water Services 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,

25 Business Plan 25

26 Development Examined 12 existing business and service models Utilized Stakeholder Input Draft business plan February 2013 Final Business plan April

27 Contents Organization Market Analysis Service / Operational Plan Financial Plan 27

28 Organizational Structure 28

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

30 Protocols 30

31 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 31

32 2011 TAPE protocol No evaluation of maintenance and life cycle costs No evaluation of required level of effort for maintenance Background 32

33 Maintainability Protocols 33

34 Approach Step 1: Test Baseline Solids Loading Step 2: Determine maintenance needs Step 3: Calculate baseline maintenance cycle Step 4: Calculate lifecycle maintenance costs 34

35 Start with a clean installation 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 STEP 1: Test Baseline Solids Loading 35

36 16 Maintenance Threshold 14 Flow Rate at Bypass Design Flow Rate Suspended Sediment Concentration Loading Fictional data provided for example purposes only 36

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 Vactoring sediment from settling chambers, replacing prefilter media, trimming vegetation. System Recharge Vactoring sediment from settling chambers, replacing primary filtration media, replacing plants. Additional Maintenance Actions Unanticipated maintenance procedures (e.g., fixing leaks, adjusting orifice diameters, etc.) 37

38 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 38

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. 39

40 No Certification or Approval The STTC will NOT certify or approve systems The STTC will only report data 40

41 Quality Assurance Project Plan (QAPP) Approved by Ecology in May 2015 Allows testing at ODOT facility using a Standardized Test Hydrograph (produced by computer controlled pumps) QAPP addenda required for individual technologies 41

42 Site Design and Construction 42

43 Goals Flexible to test a range of stormwater treatment BMP types, starting with proprietary devices Representative of hydrologic and water quality conditions in urban stormwater Convenient and cost effective for 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 43

44 Additional Criteria Used for Site Selection Gravity flow stormwater conveyance to the testing facility Appropriate discharge point Safe access 44

45 STTC Location: Columbia Slough 45

46 STTC Location: Columbia Slough ODOT East Portland Maintenance Yard 46

47 STTC Location: Columbia Slough 47

48 STTC Location: Columbia Slough 48

49 Drainage area: ~1,000 acres Site Design 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

50 Diversion Structure 50

51 Site Design Simultaneously test three systems Three 14 X 17 foot pads Pump Operation Controlled discharge rates up to 125 GPM Gravity Operation Controlled discharge rates up to 250 GPM Expansion Area 1.5 acres 51

52 Site Layout 52

53 Under Construction 53

54 Under Construction 54

55 Under Construction 55

56 Under Construction 56

57 Assists end users of stormwater treatment technologies. NPDES compliance Life Cycle information Why is the STTC Important? Independent evaluation of technologies 57

58 Why Become an STTC Member Agency? Immediate access to maintenance metrics Access to maintenance cost estimating tools. Contribute to independent evaluations Opportunity to influence STTC operations 58

59 Net yet established by the Board Phase I: Set Up and Calibration $300,000 total needed $25,000 per contributor Phase II: Operation $5,000 per year per member agency Membership Fees 59

60 Complete Site Construction Next Steps 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 60

61 Questions? Thank you. 61