HomeMy WebLinkAboutSW23002670PARK AVE. NEXHIBIT A - FLOW CONTROL BMP SITE PLAN
PERMIT NUMBER______________________APPROVED BY: ______________________DATE: _____________
0
GRAPHIC SCALE
40 20 40
SCALE: 1" = 40"
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B23000796
MAINTENANCE INSTRUCTIONS FOR A PERFORATED PIPE
CONNECTION
Your property contains an on-site BMP (best management practice) called a “perforated pipe
connection,” which was installed to reduce the stormwater runoff impacts of some or all of the
impervious surface on your property.
A perforated pipe connection is a length of drainage conveyance pipe with holes in the bottom,
designed to “leak” runoff, conveyed by the pipe, into a gravel filled trench where it can be soaked into
the surrounding soil. The connection is intended to provide opportunity for infiltration of any runoff
that is being conveyed from an impervious surface (usually a roof) to a local drainage system such as a
ditch or roadway pipe system. This on-site BMP shall be maintained per Appendix A of the City of
Renton’s Surface Water Design Manual.
MAINTENANCE RESTRICTIONS
The size and composition of the perforated pipe connection 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.
The soil overtop of the perforated portion of the system must not be compacted or covered
with impervious materials.
RECORDING REQUIREMENT
These perforated pipe connection on-site BMP maintenance and operation instructions must be
recorded as an attachment to the required declaration of covenant and grant of easement per
Requirement 3 of Section C.1.3.4 of the City of Renton Surface Water Design Manual. The intent of
these instructions is to explain to future property owners, the purpose of the BMP and how it must be
maintained and operated. These instructions are intended to be a minimum; the City of Renton may
require additional instructions based on site-specific conditions. See the City of Renton’s Surface
Water Design Manual website for additional information and updates.
TYPICAL PERFORATED PIPE CONNECTION FOR A SINGLE FAMILY RESIDENCE
MAINTENANCE INSTRUCTIONS FOR SOIL AMENDMENT
Your property contains an on-site BMP (best management practice) called “soil amendment,” which
was installed to mitigate the stormwater quantity and quality impacts of some or all of the pervious
surfaces on your property.
Soil amendment is a method of regaining greater stormwater functions in the post development
landscape by increasing treatment of pollutants and sediments, and minimizing the need for some
landscaping chemicals. To be successful, the soil condition must be able to soak water into the ground
for a reasonable number of years. This on-site BMP shall be maintained per Appendix A of the City of
Renton’s Surface Water Design Manual.
MAINTENANCE RESTRICTIONS
The size, placement, and composition 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
To be successful, the soil must be able to soak water into the ground for a reasonable number of years.
x Return leaf fall and shredded woody materials from the landscape to the site when possible in
order to replenish soil nutrients and structure.
x On turf areas, “grasscycle” (mulch-mow or leave the clippings) to build turf health.
x Maintain 2 to 3 inches of mulch over bare areas in landscape beds.
x Re-seed bare turf areas until the vegetation fully covers the ground surface.
x Avoid using pesticides (bug and weed killers) which damage the soil.
x Where fertilization is needed (mainly turf and annual flower beds), a moderate fertilization
program should be used which relies on compost, natural fertilizers, or slow-release synthetic
balanced fertilizers.
RECORDING REQUIREMENT
These on-site BMP maintenance and operation instructions must be recorded as an attachment to the
required declaration of covenant and grant of easement per Requirement 3 of Section C.1.3.4 of the
City of Renton Surface Water Design Manual. The intent of these instructions is to explain to future
property owners, the purpose of the BMP and how it must be maintained and operated. These
instructions are intended to be a minimum; the City of Renton may require additional instructions
based on site-specific conditions. See the City of Renton’s Surface Water Design Manual website for
additional information and updates.