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Session 4 Retrofit Costs, Delivery and Maintenance

Session 4 Retrofit Costs, Delivery and Maintenance. Session 4 Agenda . Comparative Costs of Retrofitting Tips on Retrofit Delivery Incentive Programs for Residential LID Retrofits Retrofit Maintenance, Tracking and Verification . Key Resources on your Disc.

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Session 4 Retrofit Costs, Delivery and Maintenance

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  1. Session 4 Retrofit Costs, Delivery and Maintenance

  2. Session 4 Agenda • Comparative Costs of Retrofitting • Tips on Retrofit Delivery • Incentive Programs for Residential LID Retrofits • Retrofit Maintenance, Tracking and Verification

  3. Key Resources on your Disc • Appendix E of Stormwater Retrofit Practices • Cost Info in Retrofit Profile Sheets in Chapter 2 of Manual

  4. The Costs of Retrofitting

  5. Retrofit Construction Costs for Existing BMPs (per impervious acre treated) BMP Conversions: 5 to 15 K BMP Enhancements: 5 to 10 K BMP Restoration: 2 to 5 K Less excavation, modify plumbing, own or control land, strong neighborhood support

  6. We Love These Guys !

  7. Dealing with the Local BMP Legacy

  8. Comparative New Retrofit Construction Costs * (per impervious acre treated) New Retrofits: 12 to 30 K Non-residential LID: 40 to 80 K * Residential LID: 80 to 120 K * Green Streets: 100 to 150 K * * Demonstration project phase, should drop

  9. Caveats on Retrofit Cost Numbers • Enormous variation within each retrofit category depending on site conditions • These estimates represent the “25% easiest” • Major influence of the “prototype effect” • CSN to do retrofit cost survey in 2012 2013 to get better estimates

  10. Breakdown of Retrofit Costs • Discovery Costs • Project Evaluation Costs • Design, Engineering and Permitting • Contracting • Construction • Retrofit Maintenance

  11. Discovery Costs • Cost to identify candidate sites for potential retrofits • Involves desktop GIS analysis and subsequent field investigation • Two options: • Comprehensive subwatershed evaluation • Limited assessment of existing BMP inventory

  12. Discovery Costs • Usually done by consultant, but can be done in house • For a ten square mile subwatershed, plan on: • 200 hours for comp subwatershedeval. • 40 hours for BMP inventory assessment

  13. Project Evaluation Costs • Cost to evaluate project feasibility, develop concept design and compute reductions • Rule of Thumb: 10 to 20 hours per site • Based on Recent CWP fieldwork • Requires some engineering review and neighborhood consultation

  14. Retrofit Cost Inflators • Wetland permitting • Off-site haul of excavated materials • Sewer or utility relocation • Need easements or contested ROW • Complicated plumbing (flow splitters) • Parking, maintenance of traffic • Amenity landscaping • Others ? What is Fixed Take care in the stream corridor !

  15. Design, Engineering and Permitting Costs • Typically run be 30 to 50% of retrofit construction cost • High end: “demonstration” projects, refiguring plumbing, unfamiliar practices • Low end: Conversion, enhancement or restoration of existing BMPs

  16. Contract Administration Costs • Assume that 1 FTE is needed for every 1 to 2 million contracted in retrofit capital budget • Project bundling, design/build, call contracts, bid incentives and other project management tools can reduce costs and improve quality

  17. Discussion

  18. General Tips on Local Retrofit Delivery

  19. Tip 1. Develop multiple revenue streams and delivery mechanisms • Capital Improvement Budget • Stormwater Offset Fees • Stormwater Utility Discounts • Stormwater Maintenance Budgets • Maintenance Enforcement • Street Reconstruction • Piggyback on Municipal Construction Projects • Public/Private Partnerships • Trading

  20. A slice of restoration Another slice of restoration

  21. Large storage retrofits are usually the most cost effective solution They do require more permitting, easements and neighborhood consultation Experience has shown that storage retrofits can treat up to 20 to 30% of subwatershed area in suburban areas, much less in highly urban ones Green street and on-site LID retrofits are needed for the next chunk of treatment Tip 2. Maximize Drainage Area Treated by Individual Retrofits

  22. Tip 3. Residential LID Retrofit Incentives Subsidies, technical assistance, stormwater utility credits and other incentives to build LID retrofits on private land

  23. Tip 4. Transform Your Stormwater Maintenance Program Use your stormwater maintenance inspection, tracking and enforcement authority to identify potential retrofits and/or major maintenance upgrades Potential for both public and private stormwater facilities

  24. Discussion

  25. Incentive Programs for Residential LID Retrofits

  26. Some Pioneer Projects • Chesapeake Bay Demonstration Projects • Alliance for the Chesapeake Bay • Blue Water Baltimore • Center for Watershed Protection • Corsica River Conservancy • DC River Smart Homes • Gunpowder River Conservancy • Montgomery County Rainscapes Rewards • Watershed Stewards Academy • Arlington, VA • Gaithersburg, MD • Rockville, MD • Programs Elsewhere in the Country • Portland, Seattle, Toronto, Kansas City

  27. Watershed Retailer Case StudyBlue Water Baltimore Funding: NFWF Grant and Baltimore City Contract Outreach: Two staff w/neighborhood specific outreach Targeting: Two subwatersheds and priority neighborhoods Design: Outdoor Water Audit by BWB staff Installation: By BWB staff or contractor LID Goal: 2000 - predominately disconnections * Tracking: Post Construction Inspection Notes: Runs own native plant nursery Website: http://www.bluewaterbaltimore.org/programs/clean-waterways/waterauditprogram/

  28. Landscape Contractor RetailerCorsica River Conservancy Rain Garden Project Funding Source: NFWF grant Incentives: Free Installation of $2000 Rain Garden Targeting: Centerville, MD, three homeowner association Design: 4 Local Master Gardeners Installation: CRC-designated landscape contractor Rain Gardens Installed: 250 Tracking: CRC takes before and after photos, GPS coordinates, street address Maintenance: Simple Agreement, with annual tasks Other Notes: Several different planting templates offered Website: http://www.corsicariverconservancy.org/activities

  29. County Rebate ProgramMontgomery County Rainscapes Rewards Funding Source: Stormwater Utility Incentives: Max Rebates up to $1200 for residential and $5000 for non-residential properties Coordination: One staff for coordination, technical support and review; ½ position for outreach; ½ position admin support Targeting: County wide, (RainScapes Neighborhoods targets six priority neighborhoods through County-installed projects – One staff; ½ position outreach; ½ position admin support) Design: Property owner responsibility but also on-line and/or onsite technical assistance available Installation: By property owner or their contractor Tracking: Post-Construction Inspection, GIS tracking and Maintenance Inspection Other Notes: On-line application system Website: http://www.montgomerycountymd.gov/dectmpl.asp?url=/content/dep/water/rainscapes.asp

  30. RainScapes projects Photos courtesy of MC-DEP RainScapes Program

  31. Other Stewardship Delivery Options • Delivery with Co-pays “River Smart” Homes (DDOE) • 10% Property Tax Credit (Anne Arundel County) • Discount on Stormwater Utility Fee (Philadelphia) • Disconnection Fundraiser ($50 per, Portland, OR) • Mandatory Disconnection (Toronto) • “Garden Angels” and “Stormwater Champions” (Kansas City)

  32. Common Problems Encountered • High initial investment in outreach to create demand • Hard to keep up with demand once things get going • Shortage of trained home auditors and installers • Reducing administrative burden for applicants

  33. Discussion

  34. Maintenance, Tracking and Verification of Retrofits

  35. Retrofit Inspections & Verification • CBP emphasizing verification of BMPs installed for the TMDL • Procedures being developed now • The Retrofit Removal Rate is not perpetual • Good for 10 years, and can be renewed based on field inspections (5 years for on-site LID retrofits) • Use of simple visual indicators • Reporting through annual MS4 reports to MDE • 1 FTE: 250 to 500 retrofits a year

  36. Retrofit Tracking

  37. Integrate Retrofits into Existing Local BMP Tracking Systems .

  38. database (full size)

  39. Retrofit Maintenance Costs Traditional BMPs: 3 to 5 % of Capital Cost Gum Surgery LID Retrofits: 3% ? Daily Flossing

  40. The Old Pond Maintenance Model One big pond

  41. The New LID Maintenance Model 24 disconnections 18 swale sections 14 rain gardens 5 bioretention areas 4 tree planting areas 6 sheet flow credits

  42. Seattle Retrofit Maintenance Case Study Adapted from Donofrio, 2012 Seattle Public Utilities

  43. Two crews Hardscape: city crew Landscape: contractor Scheduled by LOS –not frequency Semi annual inspections pre fall pre spring Maintenance Management Adapted from Donofrio, 2012 Seattle Public Utilities

  44. Maintenance Program is designed by Adapted from Donofrio, 2012 Seattle Public Utilities • Levels of Service • LOS A • Excellent effort • LOS B • Good effort • LOS C • Moderate effort • LOS D • Poor effort

  45. Layout and How To Select the desired Service Level for maintenance Adapted from Donofrio, 2012 Seattle Public Utilities

  46. Questions and Answers

  47. Your Feedback is Critical!! Please fill out an evaluation so that we can improve future workshops

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