Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program Paige Ahlborg Stormwater U April 1, 2014

RWMWD Permit Program Volume reduction required on projects disturbing one acre or more of land Some install additional rain gardens based on resident interest

Type and Number of BMPs in RWMWD

BMP Grading System A- Continue Routine Maintenance B- Minimal Maintenance Needed C- Additional Maintenance Needed ________________________ D&F- Not functioning as designed. Major fix required.

Determine average cost of maintenance/BMP Comparing various age and maintenance regimes Determine feasibility of expanded implementation BMP Maintenance Pilot Program: Project Goals

Maplewood Living Streets Little Canada 59 BMPs 1-7 years old Living Streets 31 BMPs < 1 year old

Who will do the work? RWMWD Interns Outside Maintenance Contractor Control over work performed Extra time and cost Number of hours required for full time crew Less experience Hire a crew supervisor at added cost Existing companies already performing this work Would have experienced crews Would have to fit in their schedule but also not worry about filling time

ROUTINE MAINTENANCE (BMP Grades A-C) Remove litter, weeds, accumulated sediment, and other debris Fill and protect any eroded areas Add new mulch when needed Supplemental planting as directed

Spring Clean-Up Tasks

Routine Site Visits

What did we want to know?

City of Little Canada BMPs Suggested Supplemental Maintenance 1Little or nothing needed 2Some material needed 3Needs complete replacement BMP IDLocationSize (sq ft)Mulch NeedsPlantingsSod strip A300 S Owasso Blvd F 3047 Thunder Bay Rd. (N property boundary) G3036 Thunder Bay Rd I3024 Thunder Bay Rd U 3047 Thunder Bay Rd. (across street from F) A381 Rose Ln B366 Rose Ln C350 Rose Ln D335 Rose Ln E329 Rose Ln F320 Rose Ln B2921 Condit St C2901 Condit St A401 Eli Rd

April 2013, Prior to Spring Cleanup August 2013, After 3 Visits

April 2013, Prior to Spring Cleanup August 2013, After 3 Visits

Maplewood Living Streets

DescriptionSizeUnitUnit PriceStarting QuantityUsed October 31Total Used To DateTotal Price ($)Quantity Remaining To Date Little Canada Salt-Tolerant SodNASY $ 4.50 Herbaceous Perennial4" potEach $ Herbaceous Perennial#1Each $ Herbaceous- forbs, grasses, sedgesplugsEach $ Deciduous Shrub#2Each $ Deciduous Shrub#5Each $ Evergreen Shrub#2Each $ Evergreen Shrub#5Each $ Trees and Shrubs#1Each $ Shredded Hardwood MulchNASY $ TOTAL MATERIALS ONLY: , Base Mobilization/DemobilizationNAEach $ - Spring Clean-up64Hour $ , Routine Maintenance144Hour $ , Extra Mobilization/DemobilizationNAEach $ Extra LaborNAEach $ TOTAL HOURS ONLY: , TOTAL LABOR + MATERIALS + TAX= $20, DescriptionSizeUnitUnit PriceStarting QuantityUsed October 31Total Used To DateTotal Price ($)Quantity Remaining To Date Maplewood Living Streets Salt-Tolerant SodNASY $ 4.50 Herbaceous Perennial4" potEach $ 4.00 Herbaceous Perennial#1Each $ Deciduous Shrub#2Each $ Deciduous Shrub#5Each $ Evergreen Shrub#2Each $ Evergreen Shrub#5Each $ Shredded Hardwood MulchNACY $ TOTAL MATERIALS ONLY: Base Mobilization/DemobilizationNAEach $ - Spring Clean-up48Hour $ , Routine Maintenance96Hour $ , Extra Mobilization/DemobilizationNAEach $ Extra LaborNAEach $ TOTAL HOURS ONLY: , TOTAL LABOR + MATERIALS + TAX= $6, Total Hours and Material for 2013

Results Summary Living StreetsLittle Canada # of Visits46 # of Rain Gardens3057 Avg Size (sq ft) Starting GradeAB-C Total Cost$6,668$20,498 Total Hours Avg Cost/Hour$86$88 Avg Time/Garden (hours) Avg Cost/Garden$185$259

Estimated Costs per Basin Size for Older Rain Gardens SiteCost/Rain Garden sf (maintenance + plants) $ sf (maintenance only) $ sf (maintenance + plants) $ sf (maintenance only) $ sf (maintenance + plants) $ sf (maintenance only) $ sf (maintenance + plants) $749

Challenges Reporting Form Keep more detail of time at larger basins Lack of citizen involvement Weather

Next Steps Extend contract for 2014 at same sites Gather more data to refine results Approach Cities with cost estimate to maintain their BMPs Repair failing BMPs

Questions? (651)