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'''Construction and Maintenance Costs'''
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[[File:Pdf image.png|100px|thumb|alt=pdf image|<font size=3>[https://stormwater.pca.state.mn.us/index.php?title=File:Cost-benefit_considerations_for_bioretention_-_Minnesota_Stormwater_Manual_feb_2021.pdf Download pdf]</font size>]]
Chapter 6 outlines a cost estimation method that site planners could use to compare the relative construction and maintenance costs for structural BMPs. These curves are excellent for purposes of comparison; however, it is recommended that construction and maintenance budgets should be based on site specific information. Once the construction plans are created, designers could use Table 12.BIO.5 and the cost estimation worksheet in Appendix D.  
 
  
Table 12.BIO.5 lists the site components that are specific to bioretention practices. Not included in this table are those cost items that are common to all construction projects, such as mobilization, traffic control, erosion and sediment control, permitting, etc. A more detailed worksheet, utilizing 2005 construction prices, is contained in Appendix D.
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General [[Process for selecting Best Management Practices#Using cost factors to select BMPs|cost estimation]] methods can be used by site planners to compare the relative construction and maintenance costs for structural BMPs. However, it is recommended that construction and maintenance budgets should be based on site specific information. Once the construction plans are created, designers could use the table below and the cost estimation worksheet. The table below lists the site components that are specific to bioretention practices. Not included in this table are those cost items that are common to all construction projects, such as mobilization, traffic control, erosion and sediment control, permitting, etc.  
  
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{{:Cost components for bioretention practices}}
  
{{:Recommended maintenance activities for bioretention areas}}
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{{:Bioretention device cost estimate worksheet}}
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<noinclude>
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==Related pages==
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*[[Bioretention terminology]] (including types of bioretention)
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*[[Overview for bioretention]]
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*[[Design criteria for bioretention]]
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*[[Construction specifications for bioretention]]
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*[[Operation and maintenance of bioretention]]
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*[[Assessing the performance of bioretention]]
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*[[Cost-benefit considerations for bioretention]]
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*[[Calculating credits for bioretention]]
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*[[Soil amendments to enhance phosphorus sorption]]
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*[[Summary of permit requirements for bioretention]]
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*[[Supporting material for bioretention]]
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*[[External resources for bioretention]]
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*[[References for bioretention]]
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*[[Requirements, recommendations and information for using bioretention with no underdrain BMPs in the MIDS calculator]]
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*[[Requirements, recommendations and information for using bioretention with an underdrain BMPs in the MIDS calculator]]
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</noinclude>
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<noinclude>
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[[Category:Level 2 - Best management practices/Cost benefit]]
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[[Category:Level 3 - Best management practices/Structural practices/Bioretention‏‎]]
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</noinclude>

Latest revision as of 20:54, 12 December 2022

General cost estimation methods can be used by site planners to compare the relative construction and maintenance costs for structural BMPs. However, it is recommended that construction and maintenance budgets should be based on site specific information. Once the construction plans are created, designers could use the table below and the cost estimation worksheet. The table below lists the site components that are specific to bioretention practices. Not included in this table are those cost items that are common to all construction projects, such as mobilization, traffic control, erosion and sediment control, permitting, etc.

This table shows cost Components for Bioretention Practices
(Link to this table)

Implementation Stage Primary Cost Components Basic Cost Estimate Other Considerations
Site Preparation Tree & plant protection Protection Cost ($/area) x Affected Area Removal of existing structures, topsoil removal and stockpiling
Clearing & grubbing Clearing Cost ($/area) x Affected Area Removal of existing structures, topsoil removal and stockpiling
Topsoil salvage Clearing Cost ($/area) x Affected Area Removal of existing structures, topsoil removal and stockpiling
Site Formation Excavation / grading 4-ft Depth Excavation Cost ($/acre) x Area (acre) Soil & rock fill material, tunneling
Hauling material offsite Excavation Cost x (% of Material to be hauled away) Soil & rock fill material, tunneling
Structural Components Under-drains Under-drain cost ($/lineal foot) x length of device Pipes, catch-basins, manholes, valves
Inlet structure ($/structure) or ($/curb cut) Pipes, catch-basins, manholes, valves
Outlet structure ($/structure) Pipes, catch-basins, manholes, valves
Liner Liner cost ($/square yard) x area of device) Pipes, catch-basins, manholes, valves
Site Restoration Filter strip Sod cost ($/square foot) x filter strip area Tree protection, soil amendments, seed bed preparation, trails
Soil preparation Topsoil or amendment cost ($/acre) x Area (acre) Tree protection, soil amendments, seed bed preparation, trails
Seeding Seeding Cost ($/acre) x Seeded Area (acre) Tree protection, soil amendments, seed bed preparation, trails
Planting / transplanting Planting Cost ($/acre) x Planted Area (acre) Tree protection, soil amendments, seed bed preparation, trails
Annual Operation, Maintenance, and Inspection Debris removal Removal Cost ($/acre) x Area (acre) x Frequency Vegetation maintenance, cleaning of structures
Sediment removal Removal Cost ($/acre) x Area (acre) x Frequency Vegetation maintenance, cleaning of structures
Weed control Labor cost ($/hour) x Hours per visit x Frequency Vegetation maintenance, cleaning of structures
Inspection Inspection Cost ($) x Inspection Frequency Vegetation maintenance, cleaning of structures
Mowing Mowing Cost ($) x Mowing Frequency Vegetation maintenance, cleaning of structures


Bioretention device cost estimate worksheet.
Link to this table

Project Title
Owner
Location
Project Number
Date
Description Units Quantity Unit Cost Total Estimated Price
Site Preparation
Tree removal - up to 12" diameter each $350.00 $0.00
Clear and grub brush square yard $1.50 $0.00
Tree protection - temp. fence lineal foot $3.00 $0.00
Topsoil - 6" depth, salvage on site square yard $4.50 $0.00
Site Formation
Excavation - 4' average depth square yard $10.00 $0.00
Grading square yard $1.50 $0.00
Hauling off-site square yard $5.50 $0.00
Structural Components
Underdrain - with pea gravel and geotextile lineal foot $30.00 $0.00
Inlet structure each $1,500.00 $0.00
Outlet structure each $2,500.00 $0.00
Site Restoration
Filter strip square yard $0.00 $0.00
Soil preparation square yard $30.00 $0.00
Seeding - above outlet elevation square yard $0.50 $0.00
Planting - below outlet elevation square yard $30.00 $0.00
Mulch square yard $5.00 $0.00
Subtotal $0.00
10% Contingencies $0.00
Subtotal $0.00
Apply MN Location Factor $0.00
TAL CONSTRUCTION COST $0.00
Annual Operation and Maintenance
Debris removal per visit $50.00 $0.00
Weed control per visit $50.00 $0.00
Sediment removal per yeart $500.00 $0.00
Replace planting media square yard $12.00 $0.00
Replace plants per plant $5.00 $0.00
Mow filter strips per visit $50.00 $0.00
Erosion repair square yard $75.00 $0.00
Inspection per visit $125.00 $0.00
Subtotal $0.00
Apply MN Location Factor $0.00
TOTAL ANNUAL O&M COST $0.00
Minnesota Location Factors
Bemidji 0.963
Brainerd 1.003
Detroit Lakes 0.962
Duluth 0.991
Mankato 0.990
Bemidji 0.963
Minneapolis 1.035
Rochester 0.983
St. Paul 1.000
St. Cloud 1.002
Thief River Falls 1.042
Willmar 0.961
Windom 0.935

Note: Suggested unit costs are based on RS Means prices for Spring, 2005, then factored into an area basis based on typical design features for Constructed Wetlands BMPs. To be used for preliminary cost estimation



Related pages

This page was last edited on 12 December 2022, at 20:54.