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PAGE 001 OF 008
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Operation and Maintenance Manual for Stormwater
Collection and Detention System
Scott Label 4 -Lot Residential Short Plat
4643 S. 146th Street, Tukwila, WA 98168
(File No: L01 -034)
Table of Contents:
Operations of System
Inspection Checklist
October 8, 2002
Prepared by
Bruce S. MacVeigh, P.E.
Civil Engineer /Small Site Geotechnical
14245 59 Ave. S.
Tukwila, WA 98168
Office: (206) 242 -7665 Fax: Same
Operation and Maintenance of Short Plat Storm System
The operation of both the common and individual lot portions of the system is
simple and requires only occasional inspections and maintenance procedures.
Attached within this manual is a set of checklists with scheduling and
maintenance requirements.
The commonly maintained storm system consists of a series of catch basins and
a large 48 foot long 48" diameter stormwater detention tank, with one large 54"
diameter catch basin at each end. A restrictor tee with orifice is located in the
large catch basin to the north. The detention portion of the system collects and
releases storm water from the private road surface and from the individual house
driveways and roof tops. It is the joint responsibility of all of the homeowners to
inspect, clean and maintain this part of the system. The handling of this joint
responsibility is spelled out in the storm drainage easement recorded with the
original short plat.
The water from the individual driveways and roof tops passes through a sediment
control sump, one of which is located on each individual lot. The inspection,
cleaning and maintenance for this sump is the same as for catch basins, and is
each homeowner's individual responsibility.
Note that along with each lot's sump, the house downspouts and gutters should
be checked and cleaned each year, or more often. Doing this will also reduce
the work in cleaning out the sediment sump for each lot when the time comes.
Details for the overall system's inspection and clean out, for both floating debris
and sediment in the bottom of all catch basins and detention tank, are given in
the attached checklists, along with maintenance items which may affect the
system's proper operation. Note that some things apply only to the individual lot
portions of the system, some apply to the commonly maintained portion of the
system, and some apply to both.
Questions about inspection and maintenance of this facility may be directed to
Bruce S. MacVeigh, P.E., Civil Engineer, (206) 242 -7665.
INSTRUCTIONS FOR USE OF MAINTENANCE CHECKLISTS
The following pages contain maintenance needs for most of the components that are part of
your drainage system, as well as for some components that you may not have. Ignore the
requirements that do not apply to your system. You should plan to complete a checklist for all
system components on the following schedule:
1. Monthly from November through April
2. Once in late summer (preferable September)
3. After any major storm (use 1 -inch in 24 hours as a guideline), items marked "S"
only.
Using photocopies of these pages, check off the problems you looked for each time you did an
inspection. Add comments on problems found and actions taken. Keep these "checked"
sheets in your files. Some items do not need to be looked at every time an inspection is done.
Use the suggested frequency at the left of each item as a guideline for your inspection.
REQUIRED ACTIONS: The following actions shall be taken to ensure that pollution generated
on site shall be minimized:
1. Warning signs (e.g., "Dump No Waste Drains to Stream shall be painted or embossed
on or adjacent to all storm drain inlets. They shall be repainted as needed. Contact the
Municipality regarding availability of stenciling supplies.
2. Parking lots shall be swept when necessary to remove debris and, at a minimum, twice a
year. Use of newer model high velocity vacuum sweepers is recommended as they are
more effective in removing the more harmful smaller particles from paved surfaces.
3. Sediment removed from detention vaults shall be disposed of in a proper manner.
Contact the Municipality for instruction prior to completing this task.
4. No activities shall be conducted on site that are likely to result in short-term high
concentration discharge of pollution to the stormwater system. Such activities may
include, but not be limited to, vehicle washing, vehicle maintenance, and cleaning of
equipment used in the periodic maintenance of buildings and paved surfaces.
5. Employees shall receive basic instruction regarding the control of pollution from
commercial operations. Contact the Department of Ecology or the City of Tacoma
Stormwater Source Control Program at (206) 591 -5588 for assistance in completing this
task.
Frequency
Drainage
Systems
Feature
i
Problem
Conditions To Check For
Conditions That Should Exist
M
Structure
Trash S debris
includes
sedtmert)
Distance between debris buildup and bottom of
orifice plate is less than 1-1/2 feet
Al trash and debris removed.
A
Structural
damage
Structures are not securely attached to
manhole wail and outlet pipe structure should
support at least 1 000 pounds of up or down
pressure.
Structure securely attached to
vat and outlet pipe.
A
Structure is not in upright position (allow up to
10% from plumb).
Structure in correct position.
A
Connections to outlet pipe are not watertight
and show signs of rust
Connections to outlet pipe are
watertight; structure repaired or
replaced and works as designed.
M
Any holes- -other than designed holes —in the
structure.
Structure has no holes outer that
designed holes.
M,5
Cleanout
gala
Damaged or
pissing
Cleanout gate is not watertight or is missing.
Gate is watertight and worts as
designed.
A
Gate cannot be moved up and down by one
maintenance person.
Gate paves up and down easit
and is watertight
M,S
Chain leading to gate is missing or damaged.
Chant is in place and worts as
designed.
A
Gate is rusted over 50% of its surface area.
Gate is repaired or replaced to
meet design standards.
M,S
Obstructions
Any trash, debris, seddment, or vegetation
b ocldng the plate
Plate is free of all obstructions
and weds as designed.
M,S
Overlbw
Dice
Obstructions
Any trash or debris biocldng (or having the
potential of blocidng) the overflow pine.
Pipe is free of all obstructions
and works as destined.
ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Control Structure/F ow Restrictor
(Structure that controls rate at which water exits facility)
if you are unsure whether a problem exists, please contact a Professional Engineer.
Comments:
Key:
A= Annual (March or April preferred)
M= Monthly (See schedule)
S =After major storms (use 1 -inch in 24 hours as a guideline)
J -17
Frequency
Drainage
System
Feature
Probtem
Conditions To Check For
Conditions That Should F
M.S.
General
Trash, debris, and
sediment in or on
basin
Trash or debris in front of the catch basin
opening is blacldng capacity by more than
10%
No trash or debris located immedatey' I
front of catch basin opening. Grates I
kept clean and allows water to enter.
M
Sediment or debris On the basin) that
exceeds 1/3 the depth from the bottom of
basin to invert of the lowest pipe into or out
of the basin.
No sediment or debris in the otcn tas4
Catch basin's dug out and clean.
M,S
Trash or debris in any inlet or pipe
blocking more than 1/3 of its height
Inlet and outlet pipes free of bash or
debris. 6f
M
Structural damage
to frame and/or
top stab
Comer of frame extends more than 3/4
inch past curb face into the street Of
applicable).
Frame is even with curb.
M
Top stab has holes larger than 2 square
inches or cracks wider than 1/4 inch
(intent is to make se all material is.
running into the basin).
Top slab is free of toles and crada.
M
Frame not sitting flush on top slab, i.e..
separation of more than 3/4 inch of the
frame from the top stab.
Frame is sitting flush on top slab.
A
Cracks in basin
walls/bottom
Creels wider than 12 inch and longer
thane feet, any evidence of soil particles
entering catch basin through cracks, or
maintenance person judges that structure
is unsound.
Basin replaced or repaired to design
standards. Contact a professional
engineer for evaluation.
A
Grads wider'than 1/2 inch and longer
than 1 foot at the joint of any inlet/outlet
pipe or any evidence of soil particles
entering catch basin through cracks.
No oracle more than 1/4 inch wide at the
joint of inlet/outlet pipe. Contact a
professional engineer for evaluation.
A
Settlement/
misalignment
Basin has settled more than 1 inch or has
rotted more than 2 inches out of
alignment
Basin replaced or repaired to design.
standards Contact Con a profes W sior
engineer for evaluation.
M.S
Fre hand or
other pollution
Presence of chemicals such as natural
gas, ob, and gasoline. Obnoxious color,
odor. or sludge noted
No color, odor, or sludge Basin is dug
out and clean.
M,S
Outlet pipe is
clogged with
vegetation
Vegetation or roots growing in inlet/outlet
pipe joints that is more than sit inches tall
and less than slot inches apart
No vegetation or root growth present
Maintenance Checklist for Catch Basins and Inlets
Comments:
ATTACHMENT "A" (CONTINUED)
Kev:
A= Annual (March or April preferred)
M= Monthly (see schedule)
S =After major storms (use 1 -inch in 24 hours as a guideline)
J -18
If you are unsure whether a problem exists, please contact a Professional Engineer.
20% of the design depth debris so that it matches design.
A
Vegetation Vegetation (e.g., weedy shrubs or Water flows freely through caches.
saps) that reduces free movements Grassy vegetation should be left
of water through ditches. alone.
M Erosion damage to slopes See Ponds Checkist.
See Ponds Checldst
A Rode Enin g out of place or Maintenance
person can see native sal Repbce rocks to design standard.
missing (if applicable) beneath the rocks luting.
Varies Catch basins See Catch Basins Checklist. See Catch Basins Checklist.
1.1,5 Soaks Trash debris See above fa Ditches. See above for Ditches.
M Sedanent buildup See above for Ditches. Vegetation nay need to be reptantec
after cleating.
M Vegetation not growing or Grass cover is sparse and seedy or Aerate soils and reseed and mulch
overgrown areas are overgrown with woody bare areas. Maintain grass height a
vegetation. a minimum of 6 inches for best
stammater treatment Remove
woody growth, recontour, and
reseed as necessary.
M.5 Erosion damage to slopes See Ponds Checklist. See Ponds Checklist.
M Conversion by homeowner Swale has been filed in or blocked by If possible, speak with homeowner
to incompatible use shed, woodpile, shrubbery, etc. and request that svrale area be
restored. Contact the Municipality
to report problem if not rectified
voluntarily.
J -25
ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Conveyance Systems (P'pes, Ditches, and Swales)
Frequency S
System Drainage
P
Problem C
Conditions to Check For C
Conditions That Should Gist
M,S P
Pipes S
Sedurwtt debris A
Accumulated sediment that exceeds P
Pipe cleaned of au sediment and
M V
Vegetation V
Vegetation that reduces free movement A
All vegetation removed so water
A D
Damaged (rusted, bend, or P
Protective coating is damaged; rust is P
Pipe repaired or replaced.
M A
Any dent that
y s gn fieantly impedes flow P
Pipe repaired or replaced.
M P
Pipe has major cracks or tears allowing P
Pipe repaired or replaced.
M.S O
Open ditches T
Trash debris D
Dumping of yard wastes such as grass R
Remove trash and debris and
M S
Sediment buildup A
Accumutated sediment that exceeds D
Ditch cleaned of an sediment and
J -25
ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Conveyance Systems (P'pes, Ditches, and Swales)