Storm MAINTENANCE PLANEXHIBIT A
MAINTENANCE PLAN
PALISADES WEST PLAT
SUB-05-0458-YL
INSTRUCTIONS FOR MAINTENANCE OF STORM DRAINAGE FACILITIES
The following pages contain maintenance needs for most components that are part of the
proposed drainage system. A checklist should be completed for all system components
according to the schedules shown in the tables.
Using photocopies of these pages, check off the problems identified with each inspection. Add
comments on problems found and actions taken. Keep these "checked" sheets in a file, as they
will be used to write the annual report (due in May of each year). Some items do not need to be
checked with every inspection. Use the suggested frequency at the left of each item as a
guideline for the inspections.
The City of Yelm is available for technical assistance. Do not hesitate to call, especially if it
appears that a problem may exist.
WARRANTY AGREEMENT EXHIBIT "A"
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SUB-05-0458-YL
SECTION 1 - REQUIRED MAINTENANCE
The drainage facilities will require occasional maintenance. The checklists below are the minimum
maintenance requirements and inspection frequencies.
Maintenance Checklist for Conveyance Systems (Pipes)
Drainage ,,
System Conditions That Should
Fre uenc Feature Re 'd Problem Conditions to Check For Exist
M.S. Pipes ,, Sediment & Accumulated sediment that exceeds Pipe cleaned of all
debris 20% of the diameter of the pipe. sediment and debris.
M Vegetation Vegetation that reduces free All vegetation removed
~ movement of water through pipes. so water flows freely.
A Damaged Protective coating is damaged, rust Pipe repaired or
(rusted, bent is causing more than 50% replaced.
'' or crushed) deterioration to any part of pipe.
M Any dent that significantly impedes Pipe repaired or
flow (i.e., decreases the cross replaced.
,, section area of pipe by more than
20%).
M Pipe has major cracks or tears Pipe repaired or
allowing groundwater leakage. replaced.
If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance.
Comments:
Key: A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storms
WARRANTY AGREEMENT EXHIBIT "A"
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Maintenance for Catch Basins and Inlets
Drainage ,,
System Conditions That Should
Frequent Feature Re 'd Problem Conditions to Check For Exist
M,S General Trash, debris Trash or debris in front of the No trash or debris located
and sediment catch basin opening is immediately in front of catch
in or on basin blocking capacity by more than basin opening. Grate is
10%. kept clean and allows water
~ to enter.
M Sediment or debris (in the No sediment or debris in the
basin) that exceeds 1/3 the catch basin. Catch basin is
depth from the bottom of basin dug out and clean.
to invert of the lowest pipe into
or out of the basin.
M,S Trash or debris in any inlet or Inlet and outlet pipes free of
pipe blocking more than 1/3 of trash or debris.
~ its height.
M Structural Corner of frame extends more Frame is even with curb.
damage to than 3/4" past curb face into
frame and/or street (if applicable).
~ top slab
M Top slab has holes larger than Top slab is free of holes and
2 square inches or cracks cracks.
wider than 1 /4" (intent is to
make sure all material is
~ running into the basin.
M Frame not sitting flush on top Frame is sitting flush on top
slab, i.e., separation of more of top slab.
,, than 3/4" of the frame from the
top slab.
A Cracks in Cracks wider than 1/2" and Basin replaced or repaired
basin longer than 3", any evidence of to design standards.
walls/bottom soil particles entering catch Contact a professional
basin through cracks or engineer for evaluation.
maintenance person judges
~ that structure is unsound.
A Cracks wider than 1/2" and No cracks more than 1/4"
longer than 1' at the joint of wide at the joint of
any inlet/outlet pipe or any inlet outlet pipe.
evidence of soil particles
entering catch basin through
~ cracks.
A Settlement / Basin has settled more than 1" Basin replaced or repaired
misalignment or has rotated more than 2" out to design standards.
of alignment. Contact a professional
~ engineer for evaluation.
M,S Fire hazard of Presence of chemicals such as No color, odor or sludge.
other pollution natural gas, oil and gasoline. Basin is dug out and clean.
~ Obnoxious color, odor or
sludge noted.
M,S Outlet pipe is Vegetation or roots growing in No vegetation or root growth
clogged with inlet/outlet pipe joints that are present.
~ vegetation more than 6" tall and less than
6" apart.
WARRANTY AGREEMENT EXHIBIT "A"
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SECTION 2 - RESPONSIBLE ORGANIZATION
The homeowners association shall be responsible for the operations and maintenance of
all onsite storm drainage facilities.
SECTION 3 - VEGETATION MANAGEMENT PLAN
All disturbed pervious areas on the site will be landscaped to provide as aesthetically
pleasing environment.
SECTION 4 - INFILTRATION POND
The bottom surface of the infiltration pond shall be periodically inspected for build-up
of sediment and debris. If the pond begins to have standing water, especially after
rainfall has ceased for several days, the infiltration facility may not be infiltrating
properly and should be inspected.
WARRANTY AGREEMENT EXHIBIT "A"
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