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

Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

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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. - PowerPoint PPT Presentation

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Page 1: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

Maintaining Stormwater BMPs:

RWMWD 2013 BMP Maintenance

Pilot ProgramPaige AhlborgStormwater UApril 1, 2014

Page 2: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program
Page 3: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

RWMWD Permit Program

Volume reduction required on projects disturbing one acre or more of land

Some install additional rain gardens based on resident interest

Page 4: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

Type and Number of BMPs in RWMWD

Page 5: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

BMP Grading SystemA- Continue Routine

MaintenanceB- Minimal

Maintenance NeededC- Additional

Maintenance Needed________________________

D&F- Not functioning as designed. Major fix required.

Page 6: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program
Page 7: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program
Page 8: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

• Determine average cost of maintenance/BMP

• Comparing various age and maintenance regimes

• Determine feasibility of expanded implementation

BMP Maintenance Pilot Program: Project Goals

Page 9: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

Maplewood Living Streets

Little Canada

Little Canada59 BMPs1-7 years old

Living Streets31 BMPs< 1 year old

Page 10: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

Who will do the work?RWMWD Interns Outside Maintenance

ContractorControl over work

performedExtra 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

Page 11: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

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

Page 12: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program
Page 13: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

Spring Clean-Up Tasks

Page 14: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

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

Page 15: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

What did we want to know?

Page 16: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

City of Little Canada BMPs Suggested Supplemental Maintenance

1Little or nothing needed

2Some material needed3Needs 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

Page 17: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

April 2013, Prior to Spring Cleanup

August 2013, After 3 Visits

Page 18: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

April 2013, Prior to Spring Cleanup

August 2013, After 3 Visits

Page 19: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

Maplewood Living Streets

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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 -50.50Extra 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 30.00Extra 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

Page 24: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

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

Page 25: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

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

Page 26: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

ChallengesReporting FormKeep more

detail of time at larger basins

Lack of citizen involvement

Weather

Page 27: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

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

Page 28: Maintaining Stormwater BMPs: RWMWD 2013 BMP Maintenance Pilot Program

Questions?

[email protected](651)792-7964