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Maintaining Stormwater BMPs:
RWMWD 2013 BMP Maintenance
Pilot ProgramPaige AhlborgStormwater UApril 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 SystemA- Continue Routine
MaintenanceB- Minimal
Maintenance NeededC- 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
Little Canada59 BMPs1-7 years old
Living Streets31 BMPs< 1 year old
Who will do the work?
RWMWD Interns Outside Maintenance Contractor
Control over work performed
Extra time and costNumber 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
City of Little Canada Rain Garden Maintenance – General Task Checklist
RWMWD – January 2013
A maintenance log form will be filled out and submitted by the maintenance contractor to the RWMWD after each site visit. (RWMWD to provide form)
Additional tasks or guidance may be provided by RWMWD staff, depending on prevailing site conditions.
May Visit:
1. Remove accumulated sediment in inlets, outlets, bottom of basins, and pretreatment areas.
2. Remove all garbage and leaves.
3. Cut down last year’s growth of perennial forbs and grasses. Collect and bag all cut material.
4. Hand pull and/or treat all annual and perennial weeds.
5. Report any eroded areas or evidence of prolonged standing water to RWMWD staff and seek guidance for repairs.
6. Replace dead or diseased plants as directed by RWMWD staff.
7. Interplant amongst existing native plants to achieve approximately 1.5’ spacing as directed by RWMWD staff.
8. Replenish shredded hardwood mulch to a thickness of 2” in open areas around plants.
9. Repair any erosion issues or damaged inlet/outlet structures if possible. June Visit:
1. Check for sediment accumulation, missing mulch, eroded areas, and dead plants. Contact
RWMWD staff with any issues or concerns.
2. Pick up garbage.
3. Hand pull and/or treat all annual and perennial weeds. August Visit:
1. Check for sediment accumulation, missing mulch, eroded areas, and dead plants. Contact
RWMWD staff with any issues or concerns.
2. Pick up garbage.
3. Hand pull and/or treat all annual and perennial weeds.
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 ID Location Size (sq ft) Mulch Needs Plantings Sod strip
08-25-A 300 S Owasso Blvd. 150 3 2 3
09-04-F3047 Thunder Bay Rd. (N property boundary) 150 1 1 1
09-04-G 3036 Thunder Bay Rd. 150 1 1 109-04-I 3024 Thunder Bay Rd. 150 3 1 2
09-04-U
3047 Thunder Bay Rd. (across street from 09-
04-F) 250 1 1 1
06-03-A 381 Rose Ln. 150 3 3 306-03-B 366 Rose Ln. 150 3 3 306-03-C 350 Rose Ln. 150 3 3 306-03-D 335 Rose Ln. 150 3 1 306-03-E 329 Rose Ln. 150 3 1 306-03-F 320 Rose Ln. 150 2 1 208-25-B 2921 Condit St. 150 2 2 308-25-C 2901 Condit St. 150 2 2 309-04-A 401 Eli Rd. 150 3 1 2
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
Description Size Unit Unit Price Starting Quantity Used October 31 Total Used To Date Total Price ($) Quantity Remaining To Date
Little Canada
Salt-Tolerant Sod NA SY $ 4.50
Herbaceous Perennial 4" pot Each $ 1.70 14.00 14.00 23.80
Herbaceous Perennial #1 Each $ 6.00 10.00 10.00 60.00
Herbaceous- forbs, grasses, sedges plugs Each $ 0.85 624.00 624.00 530.40
Deciduous Shrub #2 Each $ 20.00
Deciduous Shrub #5 Each $ 30.00
Evergreen Shrub #2 Each $ 20.00
Evergreen Shrub #5 Each $ 30.00
Trees and Shrubs #1 Each $ 6.00 7.00 7.00 42.00
Shredded Hardwood Mulch NA SY $ 15.90 50.00 50.00 795.00
TOTAL MATERIALS ONLY: 705.00 705.00 1,451.20
Base Mobilization/Demobilization NA Each $ -
Spring Clean-up 64 Hour $ 80.00 64.00 38.00 3,040.00 26.00
Routine Maintenance 144 Hour $ 80.00 144.00 55.00 194.50 15,560.00 -50.50
Extra Mobilization/Demobilization NA Each $ 175.00
Extra Labor NA Each $ 80.00
TOTAL HOURS ONLY: 208.00 55.00 232.50 18,600.00 -24.50
TOTAL LABOR + MATERIALS + TAX= $20,498.97
Description Size Unit Unit Price Starting Quantity Used October 31 Total Used To Date Total Price ($) Quantity Remaining To Date
Maplewood Living Streets
Salt-Tolerant Sod NA SY $ 4.50
Herbaceous Perennial 4" pot Each $ 4.00
Herbaceous Perennial #1 Each $ 12.00
Deciduous Shrub #2 Each $ 20.00
Deciduous Shrub #5 Each $ 30.00
Evergreen Shrub #2 Each $ 20.00
Evergreen Shrub #5 Each $ 30.00
Shredded Hardwood Mulch NA CY $ 45.00
TOTAL MATERIALS ONLY:
Base Mobilization/Demobilization NA Each $ -
Spring Clean-up 48 Hour $ 80.00 48.00 13.00 1,040.00 35.00
Routine Maintenance 96 Hour $ 80.00 96.00 66.00 5,280.00 30.00
Extra Mobilization/Demobilization NA Each $ 175.00
Extra Labor NA Each $ 80.00
TOTAL HOURS ONLY: 144.00 79.00 6,320.00 65.00
TOTAL LABOR + MATERIALS + TAX= $6,668.00
Total Hours and Material for 2013
Results SummaryLiving Streets Little Canada
# of Visits 4 6
# of Rain Gardens 30 57
Avg Size (sq ft) 200 250
Starting Grade A B-C
Total Cost $6,668 $20,498
Total Hours 79.0 232.5
Avg Cost/Hour $86 $88
Avg Time/Garden (hours) 2.2 3.9
Avg Cost/Garden $185 $259
Estimated Costs per Basin Sizefor Older Rain Gardens
Site Cost/Rain Garden
150-300 sf (maintenance + plants) $252
150-300 sf (maintenance only) $256
301-450 sf (maintenance + plants) $298
301-450 sf (maintenance only) $261
451-700 sf (maintenance + plants) $304
451-700 sf (maintenance only) $184
6800 sf (maintenance + plants) $749
ChallengesReporting FormKeep more
detail of time at larger basins
Lack of citizen involvement
Weather
Next StepsExtend contract
for 2014 at same sites
Gather more data to refine results
Approach Cities with cost estimate to maintain their BMPs
Repair failing BMPs
