HomeMy WebLinkAboutL_Varma Declaration of Covenant_230412_v5
MAINTENANCE INSTRUCTIONS FOR PERMEABLE PAVEMENT (NON-VEGETATED)
Your property contains an on-site BMP (best management practice) called “permeable pavement,”
which was installed to minimize the stormwater quantity and quality impacts of some or all of the paved surfaces on your property.
Permeable pavements reduce the amount of rainfall that becomes runoff by allowing water to seep
through the pavement into a free-draining gravel or sand bed, where it can be infiltrated into the
ground. This on-site BMP shall be maintained per Appendix A of the City of Renton’s Surface Water Design Manual.
Permeable Pavements
The type(s) of permeable pavement used on your property is (CHECK THE BOX(ES) THAT APPLY):
Porous concrete
Porous asphalt
Permeable pavers
Modular grid pavement
MAINTENANCE RESTRICTIONS
The area covered by permeable pavement as depicted by the site plan and design details must be
maintained as permeable pavement and may not be changed without written approval from the City of Renton or through a future development permit from the City of Renton.
INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES
• Permeable pavements must be inspected after one major storm each year to make sure it is
working properly. More frequent inspection is recommended.
• Prolonged ponding or standing water on the pavement surface is a sign that the system is
defective and may need to be replaced. If this occurs, contact the pavement installer or the City
of Renton for further instructions.
• A typical permeable pavement system has a life expectancy of approximately 25 years. To help
extend the useful life of the system, the surface of the permeable pavement should be kept clean, stable and free of leaves, debris, and sediment through regular sweeping or vacuum
sweeping. Aggregate fill in modular grid pavement may need periodic surface replenishment.
• The owner is responsible for the repair of all ruts, deformation, and/or broken paving grids or pavers.
• Modular grid pavement and permeable pavers filled with gravel or with gravel in the joints may need to be refilled periodically.
MAINTENANCE INSTRUCTIONS FOR BASIC DISPERSION
Your property contains an on-site BMP (best management practice) called “basic dispersion,” which
was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious
surfaces or non-native pervious surfaces on your property.
Basic dispersion is a strategy for utilizing any available capacity of onsite vegetated areas to retain,
absorb, and filter the runoff from developed surfaces. This on-site BMP has two primary components
that must be maintained:
(1) The devices that disperse runoff from the developed surfaces and
(2) The vegetated area over which runoff is dispersed.
Dispersion Devices
The dispersion devices used on your property include the following as indicated on the site
plan (CHECK THE BOX(ES) THAT APPLY):
splash blocks, rock pads, gravel filled trenches, sheet flow.
MAINTENANCE RESTRICTIONS
The size, placement, composition, and downstream flowpaths of these devices as depicted by the site plan and design details must be maintained and may not be changed without written approval from the
City of Renton or through a future development permit from the City of Renton.
INSPECTION FREQUENCY AND MAINTENANCE GUIDELINES
This on-site BMP has two primary components that must be maintained per Appendix A of the City of
Renton’s Surface Water Design Manual:
(1) The devices that disperse runoff from the developed surfaces and
(2) The vegetated flowpath area over which runoff is dispersed.
Maintenance of Dispersion Devices
• Dispersion devices must be inspected annually and after major storm events to identify and repair any physical defects.
• When native soil is exposed or erosion channels are present, the sources of the erosion or concentrated flow need to be identified and mitigated.
• Concentrated flow can be mitigated by leveling the edge of the pervious area and/or realigning or replenishing the rocks in the dispersion device, such as in rock pads and gravel filled
trenches.
Maintenance of Vegetated Flowpaths
• The vegetated area over which runoff is dispersed must be maintained in good condition free
of bare spots and obstructions that would concentrate flows.