low impact development training module 9: maintenance requirements dennis chestnut
TRANSCRIPT
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Low Impact Development Training
Module 9: Maintenance Requirements
Dennis Chestnut
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Sponsors
District Department of Transportation
U.S. Department of Transportation Federal Highway Administration
The Low Impact Development Center, Inc.
University of the District of Columbia
Funding for this project was provided through a grant from the Federal Highway Administration, U.S. Department of Transportation
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Contributors
The Low Impact Development Center, Inc.
John Shorb Landscaping, Inc.Logo
Groundwork Anacostia River, D.C.
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Copyright
Unless otherwise noted, Low Impact Development Traning, funded by DDOT & DDOE, is licensed under a Creative Commons Attribution-NonCommerical-ShareAlike 3.0 Unported License.
Content provided by cited entities remains the property of those entities and may not be used without their explicit permission.
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Overview
• District maintenance requirements• Maryland maintenance requirements• Virginia maintenance requirements
• This module will cover District of Columbia maintenance requirements in detail
• Maryland and Virginia requirements will be covered in a more abbreviated form
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Expected Outcomes
• Know how a site’s maintenance requirements are established and where to find them
• Know how maintenance requirements are enforced, and how to handle violations
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District Maintenance Requirements
• The maintenance requirements for BMPs in the District are established in DDOE’s Stormwater Management Guidebook (the Guidebook)
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Maintenance Responsibility
• A maintenance agreement and maintenance schedule must be submitted as part of the Stormwater Management Plan (SWMP)
• The property owner is responsible for maintaining the BMP in good condition, and in accordance with the approved SWMP.
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Declaration of Covenants
• A Declaration of Covenants specifically states the property owner’s maintenance responsibilities
• This is recorded with the owner’s deed• Provides for regular inspection by DDOE• Binds current and future owners to the
maintenance schedule contained in the approved SWMP
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Maintenance Inspections
• DDOE inspects all BMPs twice per year for the first five years of operation, and once every three years thereafter
• A standardized maintenance inspection form is used, and a report is prepared and maintained by DDOE
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Corrective Actions
• If violations are found, DDOE will send written notice to the property owner
• Generally, maintenance work and repairs must be done within 45-60 days
• If maintenance is not performed, DDOE will perform the necessary work and the property owner will be responsible for reimbursing DDOE for the cost of the work plus applicable penalties
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Waste Removal
• When waste material is removed from a bioretention cell, it must be disposed of in compliance with federal and District laws.
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DDOT
• Projects in the right-of-way are under DDOT’s control, and should follow DDOT’s bioretention maintenance schedule
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Maryland Maintenance Requirements
• The Maryland Department of the Environment sets out basic standards and maintenance requirements for bioretention cells
• Additional requirements are imposed at the county level
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Montgomery County, MD
• Landscape contractors performing maintenance on LID facilities must be certified by the county Department of Environmental Protection
• Training courses are offered once a year• http://www6.montgomerycountymd.gov/de
ctmpl.asp?url=/Content/dep/water/stormwatercontractor.asp
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Virginia Maintenance Requirements
• The State of Virginia requires that a maintenance agreement be executed between the property owner and the local stormwater program
• The VA DCR Bioretention Design Specification contains recommended maintenance and inspection schedules for bioretention
• http://vwrrc.vt.edu/swc/NonProprietaryBMPs.html
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Regular Bioretention Maintenance
• All facilities located within the right-of-way must follow DDOT’s recommended bioretention maintenance schedule
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General Maintenance
• Remove trash and animal waste
Method• By hand
Frequency• Quarterly and as
needed
Time of year• Year-round
Photo Courtesy of DDOT
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Drainage System Maintenance
• Inspect curb cuts and velocity dissipators for debris, sediment, and blockages
• Clean debris, sediment, and blockages from curb cuts and velocity dissipators
• Inspect velocity dissipators, weirs, and check dams for stone placement and weirs and check dams for debris accumulations
• Clean debris, sediment, and blockages from weirs and check dams
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Drainage System Maintenance (cont’d)
• Replace stone at velocity dissipators, weirs, and check dams
• Inspect for standing water in excess of 2 days
• Inspect cleanout pipes and underdrains• Flush out debris from underdrain to clear
pipe when filled with debris and when standing water exceeds 2 days
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Inspect curb cuts and velocity dissipators for debris, sediment,
and blockagesMethod• Visual
Frequency• Quarterly
Time of year• Year-round
Photo Courtesy of the Low Impact Development Center, Inc.
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Clean debris, sediment, and blockages from curb cuts and
velocity dissipatorsMethod• By hand
Frequency• Quarterly and as
needed
Time of year• Year-round Photo Courtesy of Emily Ayers
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Inspect velocity dissipators, weirs, and check dams for stone
placement and weirs and check dams for debris accumulation
Method• Visual
Frequency• Twice a year
Time of year• Year-round
Photo Courtesy of DDOT
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Clean debris, sediment, and blockages from velocity
dissipators, weirs, and check dams
Method• By handFrequency• Twice a year and as
neededTime of year• Year-round Photo Courtesy of the Low Impact Development Center, Inc.
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Replace stone at velocity dissipators, weirs, and check
dams
Method• By hand per plan
Frequency• As needed
Time of year• November-March
Photo Courtesy of the Low Impact Development Center, Inc.
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Inspect for standing water in excess of 2 days
Method• Visual
Frequency• Twice a year
Time of year• Year round
Photo Courtesy of the Low Impact Development Center, Inc.
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Inspect cleanout pipes and underdrains
Method• Visual
Frequency• Twice a year
Time of year• Year-round
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Flush out debris from underdrain to clear pipe when filled with
debris and when standing water exceeds 2 days
Method• High pressure water
hose or drain snakeFrequency• As neededTime of year• Year-round
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Plant Maintenance
• Remove weeds and non-desirable plants• Water plants regularly during the first three
years• Water plants during drought conditions (no
rain for two weeks) after three years in ground
• Remove stakes and wires• Inspect plants for disease and pest
problems
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Plant Maintenance (cont’d)
• Treat plants for disease and pest problems if needed using the least toxic method possible
• Remove plant debris and prune plants as appropriate for each plant species
• Remove dead and diseased plants as needed• Replace dead plants with same species and
cultivar during spring or fall planting season.
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Remove weeds and non-desirable plants
Method• By hand
Frequency• Three times a year
Time of year• March-April, June-
July, Sept.-Oct. Photo Courtesy of Emily Ayers
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Water plants regularly during the first three years
Method• By hand
Frequency• When rainfall is less
than one inch per week
Time of year• May-October
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Water plants during drought conditions (no rain for two weeks)
after three years in groundMethod• By hand
Frequency• Weekly during
drought
Time of year• May-October
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Remove stakes and wires
Method• By hand
Frequency• Once
Time of year• Six months after
plantingPhoto Courtesy of DDOT
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Inspect plants for disease and pest problems
Method• Visual
Frequency• Three times a year
Time of year• March-April, June-
July, Sept.-Oct.
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Treat plants for disease and pest problems if needed using
least toxic method possibleMethod• By hand
Frequency• As needed
Time of year• At appropriate time for
disease or pest treatment
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Remove plant debris and prune plants as appropriate for each
plant speciesMethod• By hand
Frequency• Twice a year and as
needed
Time of year• February-April,
September-November
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Remove dead and diseased plants as needed
Method• By hand
Frequency• As needed
Time of year• At appropriate time for
disease or pest treatment
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Replace dead plants with same species and cultivar during spring or fall planting
season. If entire group of plants has declined or died, replace with more
suitable species and cultivar.Method• According to planting
specifications
Frequency• As needed
Time of year• March 15 – April 30 or October
15 – Nov. 30
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Soil and Mulch Maintenance
• Inspect mulch and soil• Repair erosion and bare areas with new
mulch• Much with 2 inches shredded organic
mulch• Remove mulch layer before applying a
new layer
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Inspect mulch and soil
Method• Visual
Frequency• Quarterly
Time of year• Year-round
Photo Courtesy of Seattle Public Utilities
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Repair erosion and bare areas with new mulch
Method• By hand
Frequency• As needed
Time of year• Year-round
Photo Courtesy of the Low Impact Development Center, Inc.
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Mulch with 2 inches of shredded organic mulch
Method• By hand
Frequency• Once a year
Time of year• February – April
Photo Courtesy of the Low Impact Development Center, Inc.
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Remove mulch layer before applying a new layer
Method• By hand
Frequency• Every three years
Time of year• February – April
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Review
• Maintenance recommendations and requirements vary depending on who has jurisdiction over a given site
• Bioretention in the ROW should follow DDOT’s recommended maintenance schedule
• Other bioretention installations in the District should follow DDOE’s maintenance schedule
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Resources
• DDOT Bioretention Maintenance Schedule
• 2013 District of Columbia Stormwater Management Guidebook (http://ddoe.dc.gov/swregs)