Storm Drainage Maintenance Manual 001Storm Drainage Maintenance Manual
Resubmittal #I
Rainier View
Parcel No. 21724420501
9910 Durant St.
Yelm, Washington
June 19, 2007
BASELINE Job No. 04-159
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Manual content used with permission from the City of Port Orchard "Drainage Maintenance
Standards for Commercial and Multi-Family Drainage Facilities," dated August 2001
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Table of Contents
List of Figures 3
Drainage Facility Self-Inspection 4
Resource Listing 8
Facility Key 9
Site Map 10
Maintenance Components 11
A. Type I Catch Basin (also referred to as Inlet) 11
D Debris Barrier 18
E. Energy Dissipater 19
F. Pipe/Culvert 20
G. Ditch 21
H. Fencing (including Gate) 22
I. Access Road 24
J. Other -Specific to Retention/Detention Ponds (including Infiltration) 25
O. Other -Specific to Wet Ponds 34
O. Other -Specific to Infiltration (not including Ponds) 37
Appendix A -Figures
39
Appendix B -Inspection/Maintenance Checklist 55
List of Figures
Figure A-1 Type I Catch Basin 4~
Figure A-2 Type II Catch Basin 41
Figure A-4 Debris Barrier 43
Figure A-5 Ditches -Common Sections 44
Figure A-7 Typical Infiltration Pond 46
Figure A-12 Typical Wet Pond 51
Figure A-13 Typical Downspout Infiltration System 52
DRAINAGE FACILITY SELF-INSPECTION
1. How the Process Works
Commercial and multifamily property owners within Rainier View are responsible for inspecting
their drainage facilities as well as performing regular maintenance in accordance with City of
Yelm and Washington State Department of Ecology standards. This work may be done either
by in-house staff or a vendor/contractor.
This manual includes an individual site plan showing your property's drainage facilities,
information about the jurisdiction's standards for drainage facilities, maintenance information
and instructions, and an inspection/maintenance checklist form to be completed indicating that
the inspection and maintenance have been completed. A copy of this manual and copies of all
completed inspection/maintenance checklists must be kept on site at all times. The City of Yelm
may require that you submit the inspection/maintenance checklist. Contact the City of Yelm for
submittal requirements. See the Resource Listings on page 8 for contact information.
Here are the specific steps in the process
A. Facility Identification:
Review your site plan on page 10 for drainage facilities such as a pond, tank, vault, etc. To
assist you in identifying components, refer to the definitions and sketches in this manual.
Check the appropriate column, "Yes" or "No'", on the enclosed inspection/maintenance
checklist, indicating whether the components for each facility type are on your property.
NOTE: Most systems have both retentionldetention (R/D) and conveyance system
components (typically a conveyance system can contain a combination of bioswale(s),
ditch(es), pipe(s), and catch basins).
B. Inspection:
Inspect all facilities/components checked "Yes" using in-house personnel or a
vendor/contractor. Refer to this manual, which describes the City of Yelm standards for
each component and identifies possible maintenance problems with number and
description.
Report the inspection results on the enclosed inspection/maintenance checklist in the
following manner:
If the facility component already meets the standard, write "meets standard" in
the space for that component.
If the component has a maintenance problem, list the problem number from this
booklet in the space for that component.
NOTE: If there is more than one component, list the component ID number (i.e., CB #8,
CB #4, etc.) along with the problem number. You need only list components with
problems in this case. Use the back sheet of the form or attach a separate sheet if
necessary.
C. Maintenance Work:
If maintenance is required, have the work performed by in-house personnel or a
vendorlcontractor. On the inspection/maintenance checklist, check off that the work has
been completed in the "Work Completed" column, and indicate the date completed.
D. Certification:
Provide the information indicated and sign under the certification section, certifying under
penalty of perjury that the inspection has been performed, and eitherno maintenance needs
were identified or the work was completed as indicated on the checklist.
E. Submittal:
The City of Yelm may require that you submit the inspection/maintenance checklist.
Contact the City of Yelm for submittal requirements. See the Resource Listings on page 8
for contact information.
2. Be Safe!
Use caution when entering or working around catch basins and manholes, and conform to
confined space entry laws. Most inspections can be performed above ground. If confined space
entry is required, it is recommended that you contract with a qualified vendor or contractor with
confined space entry experience.
Property owners are responsible for the safety of all persons, including in-house and
vendor/contractor personnel, performing confined space entry on their property under
Washington Administrative Code (WAC) 296-62-145, with is Part M, Chapter 62, Confined
Spaces. This responsibility may involve undergoing an assessment of the property to determine
whether a permit is required for confined space entry. Contact the City of Yelm for permit
requirements.
For information and assistance, contact Washington State Labor & Industries Consultation
Program at (206) 281-5470. Information can also be found at http://www.lni.wa.gov.
3. Tools of the Trade
Depending of the type of facility you have, some of the following tools may be of assistance in
doing your own inspection:
Task Tool
Opening Manhole Cover /z" Alien Wrench
Opening Stuck Lids/Grates Crow Bar
• Liquid Wrench
Measuring Sediment Depths Measuring rod (an 8-foot length of
aluminum conduit marked at 1-foot
intervals works well for most systems)
• Tape or Chalk
Measuring Storage Space/Sediment Depths Tape Measure (12ft)
Lifting Grates/Lids Manhole Cover Hook
Inspection from above ground Mirror on a long handle
Probing for catch basins/moving heavy Straight-pointed bar
objects
General Flashlight (6 volt lantern or halogen
recommended)
• Flat Screwdriver
• Phillips Screwdriver
• Shovel
• Trash Can
• Vice Grips
• 10" Wrench
• 15" Wrench
4 Sediment Estimating-the Most Common Task
The most common maintenance problem encountered is excessive sediment level in a Type I
or Type I I Catch Basin. Please refer to this manual for information on other maintenance
problems.
Here is how to check the sediment level in a Type I or Type II Catch Basin:
A. Remove the manhole cover/grate.
Using a % -inch Alien wrench and a catch basin grate hook or crow bar.
B. Identify the sump depth (water level).
Using a probe or rod, identify the sump depth. This is done by inserting the rod through the
water and sediment until it hits the bottom of the catch basin; water level will be visible for
measurement upon removal. NOTE: Under normal conditions, the water level should be
even with the outlet pipe. A higher level indicates a blockage in the outlet. (Refer to the
booklet for more information) fnww~.v
C. Identity the sediment level. ~~u
1 Put the robe or rod in throw h the water until T°~' °r'=e""`"` ^^"~k'"=~° "=r«="~a
) p g murk "refcmnce" level a~ 6mund level
it touches the top of the sediment. Mark it ~_~_~ n~ s~°„~~n 1 M~a,,,==airt=~="u ~"
with relation to a stationary point in the catch \ "=r="=°~i~~°i~ro
basin with tape or chalk (Position A)- ~ ~~~=r~~"===a~",em a=vm
2) Put the probe or rod in through the water and
sediment until it touches the bottom of the
catch basin, and mark the probe with relation
to the same stationary point as in Item 1
above (Position B).
The difference between the two marks is the
sediment depth.
3) The water mark left on [he rod is the "sump
depth". Measure the ratio of sediment depth
to sump depth to determine the allowable
amounts.
In Type I and Type II catch basins, the sediment
must be removed if the sediment level exceeds one-third (1/3) of the sump depth (water level)
in order to meet DOE and State of Washington standards.
Resource Listing
If after consulting this manual you are still unsure whether a problem exists or the steps that
need to be taken to correct the problem, please contact City of Yelm at one of the numbers
below and ask for technical assistance.
Jurisdiction: City of Yelm
360-058-8438
Other Project Contacts
Developer: Crest Builders
5516 75'" Street West
Lakewood, WA 98499
253-475-6300
Engineer: Baseline Engineering Inc
1910 64'" Avenue West
Tacoma, WA 98466
253-565-4491
DRAINAGE FACILITY SELF-INSPECTION
1. How the Process Works
Single Family owners within Rainier View are responsible for inspecting their drainage facilities
as well as performing regular maintenance in accordance with City of Yelm and Washington
State Department of Ecology standards. This work may be done either by in-house staff or a
vendor/contractor.
This manual includes an individual site plan showing your property's drainage facilities,
information about the jurisdiction's standards for drainage facilities, maintenance information
and instructions, and an inspection/maintenance checklist form to be completed indicating that
the inspection and maintenance have been completed. A copy of this manual and copies of all
completed inspection/maintenance checklists must be kept on site at all times. The City of Yelm
may require that you submit the inspection/maintenance checklist. Contact the City of Yelm for
submittal requirements. See the Resource Listings on page 8 for contact information.
Here are the specific steps in the process
A. Facility Identification:
Review your site plan on page 10 for drainage facilities such as a pond, tank, vault, etc. To
assist you in identifying components, refer to the definitions and sketches in this manual.
Check the appropriate column, "Yes' or "No'", on the enclosed inspection/maintenance
checklist, indicating whether the components for each facility type are on your property.
NOTE: Most systems have bath retention/detention (R/D) and conveyance system
components (typically a conveyance system can contain a combination of bioswale(s),
ditch(es), pipe(s), and catch basins).
B. Inspection:
Inspect all facilities/components checked "Yes" using in-house personnel or a
vendor/contractor. Refer to this manual, which describes the City of Yelm standards for
each component and identifies possible maintenance problems with number and
description.
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FACILITY KEY
Use the table below along with the Site Map on the following page to identify the components of
your storm drainage system. Then use the information in the Maintenance Components section
of this manual to inspect and maintain your storm drainage system.
Strom Drainage System Component Abbreviation
A. Type I Catch Basin CB
B. Type II Catch Basin TIICB
C. Flow Restrictor FR
D. Debris Barrier DB
E. Energy Dissipater ED
F. Pipe/Culvert P/C
G. Ditch D
H. Fencing F
I. Access Road I AR
R. StormFilter SF
Other:
MAINTENANCE COMPONENTS
A. Type I Catch BBSID (also referred to as Inlet) (See Figure A-1 in Appendix)
Definition: An underground concrete, water receiving, inlet, rectangular in shape
(approximately 3' x 2' x 4' deep) with a slotted iron grate on top to inlet water or a solid
rectangular cover. Water may also enter/exit through culverts visible in the side walls of the
basin.
Maintenance Problem and Number:
A.1 Trash & Debris (including Sediment) Blocking Water from Entering Basin: Trash or
debris of more than % cubic foot that is covering the catch basin grate or is blocking the
inlet grate to basin by more than 20°/ .
Maintenance Necessary to bring to Standard: Remove all trash and debris from the front
of the catch basin inlet. If using a vendor or contractor, ensure that the vendor or
contractor properly disposes of waste. If not using a vendor or contractor, call the City of
Yelm for disposal information.
A.2 Trash & Debris (including Sediment): Trash and debris (in the basin) that exceeds
one-third the depth form the bottom of the basin to invert of lowest pipe into or out of the
basin. This is the most common maintenance requirement.
Maintenance Necessary to bring to Standard: Remove all trash and debris from the
catch basin. If using a vendor or contractor, ensure that the vendor or contractor properly
disposes of waste. If not using a vendor or contractor, call the City of Yelm for disposal
information.
A.3 Trash & Debris (including Sediment): Trash and debris in any inlet or outlet pipe
blocking more than one-third of its height.
Maintenance Necessary to bring to Standard: Remove all trash and debris from inlet and
outlet pipes. If using a vendor or contractor, ensure that the vendor or contractor properly
disposes of waste. If not using a vendor or contractor, call the City of Yelm for disposal
information.
A.4 SettlemenUMisalignment: Basin settles more than 1 inch or has rotated more than 2
inches out of alignment.
Maintenance Necessary to bring to Standard: Repair or replace basin to design
standards.
A.5 Structural Damage to Frame and/or Top Slab: Top concrete slab has holes larger than
2 square inches or cracks wider than % inch (intent is to make sure all material is running
into the basin through the grate).
Maintenance Necessary to bring to Standard: Repair top slab so that it is free of holes
and cracks.
A.6 Frame Not Sitting Flush on Top Slab: i.e., separation of more than'/. inch of the frame
from the top slab.
Maintenance Necessary to bring to Standard: Repair top slab so that it is free of holes
and cracks.
A.7 Cracks in Basin Walls/Bottom: Cracks wider than Y inch, any evidence of soil
particles or water entering the catch basin through cracks, or maintenance person
judges that the structure is unsound.
Maintenance Necessary to bring to Standard: Repair or replace basin to design
standards.
A.8 Cracks in Basin Around Inlet/Outlet Culverts: Cracks wider than % inch at the joint of
any inlet/outlet pipe or any evidence of soil particles or water entering the catch basin
through cracks,
Maintenance Necessary to bring to Standard: Repair or replace basin to design
standards.
A.9 Fire Hazard: Presence of chemicals such as natural gas, oil and gasoline.
Maintenance Necessary to bring to Standard: Remove flammable chemicals so that
none are present. Call the City of Yelm for disposal information.
A.10 Pollution: Presence of any chemical pollution.
Maintenance Necessary to bring to Standard: Remove contaminants so that none are
present. Call the City of Yelm for disposal information and notify them of the presence of
chemical pollution.
A.11 Catch Basin Cover Not In Place: Cover is missing or only partially in place. Any open
catch basin requires maintenance.
Maintenance Necessary to bring to Standard: Repair catch basin cover so that it is
closed.
A.12 Metal Grates -Safety Hazard: Grate with opening wider than 7/8 inch.
Maintenance Necessary to bring to Standard: Repair grate opening so that they meet
design standards.
A.13 Metal Grates -Damaged or Missing: Grate is missing or has broken members.
Maintenance Necessary to bring to Standard: Repair or replace grate so that it is in place
and meets design standards.
12
D. Debris Barrier (see Figure n-a in Appendix)
Definition: Metal trash rack, typically located on the inlet/outlet pipes.
Maintenance Problem and Number:
D.1 Trash & Debris: Trash and debris that is plugging more than 20% of the opening in the
barrier.
Maintenance Necessary to bring to Standard: Remove all trash and debris so that the
barrier is clear to receive capacity flow.
D.2 Damaged I Missing Bars: Bars are missing or entire barrier is missing.
Maintenance Necessary to bring to Standard: Repair or replace bars according to
design standards.
D.3 Damaged /Missing Bars: Bars are bent out of shape more than'/<inches.
Maintenance Necessary to bring to Standard: Repair or replace bars so that they are in
place with no bends more than 3 inches.
D.4 Damaged Bars: Bars are loose and rust is causing 50% deterioration to any part of the
barrier.
Maintenance Necessary to bring to Standard: Repair or replace barrier to meet design
standards.
13
E. Energy Dissipater
Definition: A rock pad constructed at inletloutlets to prevent erosion, or a constructed
percolation trench to disperse outletting flows over a large area, or a catch basin used to slow
fast flowing runoff. Catch basins may be a part of the dispersion trench, see Type I or Type II
Catch Basins (Sections A and B) for maintenance requirements.
Maintenance Problem and Number:
E.1 Rock Pad -Missing or Moved Rock: Only one layer of rock exists above native soil in
an area of five square feet or larger, or any exposure of native soil.
Maintenance Necessary to bring to Standard: Replace rocks to design standards.
E.2 Dispersion Trench -Pipe Plugged with sediment: Accumulated sediment that
exceeds 20% of the design depth.
Maintenance Necessary to bring to Standard: Clean/flush pipe so that it matches design.
E.3 Dispersion Trench -Not Discharging Water Properly: Visual evidence of water
discharging at concentrated points along the trench (the normal condition is a "sheet
flow" of water along trench). Intent is to prevent erosion damage.
Maintenance Necessary to bring to Standard: Rebuild trench to design standards.
E.4 Dispersion Trench -Perforations Plugged: Over%of the perforations in pipe are
plugged with debris and sediment.
Maintenance Necessary to bring to Standard: Clean or replace perforations in pipe.
E.5 Dispersion Trench -Water Flows Out Top of Distribution Catch Basin: Maintenance
person observes water flowing out of the catch basin top during any storm less than the
design storm, or it is causing or appears likely to cause damage.
Maintenance Necessary to bring to Standard: Rebuild facility to design standards.
E.6 Dispersion Trench -Receiving Area Over-saturated: Water in receiving area is
causing or has potential of causing landslide problems.
Maintenance Necessary to bring to Standard: Ensure that the geotechnical engineer's
evaluation of outlet function and soil stability is satisfactory.
E.7 Energy Dissipater -Needs Replacement: Visible signs of pad erosion, or plugged
dispersion trenches.
Maintenance Necessary to bring to Standard: Replace energy dissipater.
14
F. Pipe I Culvert
Definition: A conveyance culvert of varying diameter. May be constructed as concrete pipe
(CP), reinforced concrete pipe (RCP), corrugated metal pipe (CMP), high density (smooth wall)
polyethylene pipe (HDPP), ductile iron (DI), or corrugated high density polyethylene pipe
(CPEP), or polyvinyl chloride pipe (PVC).
Maintenance Problem and Number:
F.1 Sediment & Debris: Accumulated sediment or debris that exceeds 20% of the diameter
of the pipe.
Maintenance Necessary to bring to Standard: Clean pipe of all sediment and debris.
F.2 Vegetation: Vegetation that reduces free movement of water through pipes.
Maintenance Necessary to bring to Standard: Remove vegetation so water flows freely
through pipes.
F.3 Protective Coating Damage: Protective coating is visibly damaged, or rust is causing
more than 50% deterioration to any part of the pipe.
Maintenance Necessary to bring to Standard: Repair or replace pipe.
F.4 Joint or Culvert Misalignment: Joints are visibly misaligned, or culverts alignment is
disrupted.
Maintenance Necessary to bring to Standard: Realign or re-connect affected pipe.
F.5 Pipe Damaged: Any dents that decrease the cross sectional area of the pipe by more
than 20%.
Maintenance Necessary to bring to Standard: Repair or replace pipe.
15
G. DIYCh (See Figure A-5 in Appendix)
Definition: A conveyance system. May be U-shaped, V-shaped or trapezoidal with a flat bottom
(also referred to as a biofiltration Swale). May be rock lined, earth lined or grass lined.
Maintenance Problem and Number:
G.1 Trash 8 Debris: Trash and debris exceeding 1 cubic foot per 1,000 square feet of
ditch/biofiltration Swale and slopes.
Maintenance Necessary to bring to Standard: Clear trash and debris from ditch or
biofiltration Swale.
G.2 Sediment: Accumulated sediment that exceeds 20°/ of the design depth.
Maintenance Necessary to bring to Standard: Cleanlflush ditch or biofiltration Swale of
all sediment and debris to allow it to convey its design flow capacity. Remove all
sediment and restore to design depth.
G.3 Vegetation: Vegetation that reduces free movement of water through the ditch or
biofiltration Swale (vegetation taller than 8 inches or trees such as Alders).
Maintenance Necessary to bring to Standard: Remove vegetation so water Flows freely
through ditch or biofiltration Swale unimpeded. Mow grass to allow for proper function
within its intended capacity.
G.4 Erosion Damage to Slopes: Erosion damage over 2 inches deep where the
cause of damage is still present, or where there is a potential for continued
erosion.
Maintenance Necessary to bring to Standard: Stabilize slopes by using the appropriate
erosion control measure(s), by rock reinforcement, planting of grass, or compaction.
G.5 Check Dam Sedimentation: Accumulated sediment that causes standing water
behind the check dam.
Maintenance Necessary to bring to Standard: Replace check dam and remove
sediment.
G.6 Failure of Rock-Lined Ditch: Erosion or failure of rock slopes within ditch line.
Maintenance Necessary to bring to Standard: Replace and/or repair rock lining to re-
establish the ditch cross-section.
Iri
H. Fencing (includes gate)
Definition: Asix-foot high cyclone fence, required by the DOE and City of Yelm if pond side
slopes are steeper than 3:1 to prohibit entry due to safety considerations.
Maintenance Problem and Number:
H.1 Missing or Broken Parts: Any defect in the fence that permits easy entry into a facility.
Maintenance Necessary to bring to Standard: Repair or replace parts to provide
adequate security.
H2 Missing or Broken Parts: Parts broken or missing that can be easily seen by the public
that is below the appearance standards of the neighborhood.
Maintenance Necessary to bring to Standard: Repair or replace parts to conform to the
standards of the neighborhood.
H.3 Erosion: Erosion more than 4 inches high and 12-18 inches wide, permitting an
opening under the fence.
Maintenance Necessary to bring to Standard: Fill in openings so that there are no
openings under the fence that exceed 4 inches in height.
H.4 Wire Fences -Damaged Parts: Posts out of plumb more than 6 inches.
Maintenance Necessary to bring to Standard: Correct position so that posts are plumb
to within 1-1/2 inches and meets design standards.
H.5 Wire Fences -Damaged Parts: Top rails bent more than 6 inches.
Maintenance Necessary to bring to Standard: Repair or replace top rails so that they are
free of bends greater than 1 inch.
H.6 Wire Fences -Damaged Parts: Any part of the fence (including posts, top rails and
fabric) more than 1 foot out of design alignment.
Maintenance Necessary to bring to Standard: Align fence so it meets design standards.
H.7 Wire Fences -Damaged Parts: Missing or loose tension wire.
Maintenance Necessary to bring to Standard: Repair or replace tension wire so it is in
place and holding the fabric.
H.8 Wire Fences -Damaged Parts: Extension arm missing, broken or bent out of shape
more than 1-1/2 inches.
Maintenance Necessary to bring to Standard: Repair or replace extension arm so that it
is in place with no bends greater than'/ inch.
17
H.9 Wire Fences -Deteriorated paint or Protective Coating: Part(s) having a rusting or
scaling condition that has affected structural adequacy.
Maintenance Necessary to bring to Standard: Repair posts or parts so that they are
structurally adequate with a uniform protective coating.
H.10 Wire Fences -Damaged Parts: Missing or loose barbed wire that is sagging
more than 2-112 inches between posts.
Maintenance Necessary to bring to Standard: Repair or replace barbed wire so it is in
place with less than'/ inch sag between posts.
H.11 Wire Fences or Gates- Opening in Fabric: Opening in fabric are such that an fl-
inch diameter ball could fit through (intent is to prevent a small child from entering).
Maintenance Necessary to bring to Standard: Repair fabric so that there are no
openings in the fence.
H.12 Gates -Damage or Missing Members: Missing gate or locking device.
Maintenance Necessary to bring to Standard: Repair or replace gates and locking
devices so that all are in place.
H.13 Gates -Damage or Missing Members: Broken or missing hinges, such that the gate
cannot be easily opened and closed by the maintenance person.
Maintenance Necessary to bring to Standard: Repair or replace hinges so that they are
intact and tubed, and gate is working freely.
H.14 Gates -Damage or Missing Members: Gate is out of plumb more than 6 inches and
more than 1 foot out of design alignment.
Maintenance Necessary to bring to Standard: Align gate so it is vertical.
H.15 Gates -Damage or Missing Members: Missing stretcher bar, stretcher bands and ties.
Maintenance Necessary to bring to Standard: Repair or replace stretcher bar, bands
and ties so that all are in place.
H.16 Signs -Warning: Missing, loose or vandalized warning signs.
Maintenance Necessary to bring to Standard: Repair, replace, or clean warning signs so
that all are in place and readable.
I$
I. Access Road
Definition: Minimum 12-foot wide surface, may be constructed of class "B" road material,
asphalt concrete pavement of heavier, fabric/rock sections. Used to access control manholes
and other facility components.
Maintenance Problem and Number:
1.1 Trash & Debris: Trash and debris exceeding 1 cubic foot per 1,000 square feet (i.e.,
trash and debris to fill one standard size garbage bag).
Maintenance Necessary to bring to Standard: Clear trash and debris from site.
1.2 Blocked Roadway/Safety Hazard: Debris that could damage vehicle tires (glass and
metal).
Maintenance Necessary to bring to Standard: Remove debris so that the roadway is free
of debris that could damage tires.
1.3 Blocked Roadway/Safety Hazard: Any obstruction or vegetation restricting the access
to a road surface to less than 15 feet.
Maintenance Necessary to bring to Standard: Remove obstructions or vegetation to
allow at least a 15-foot wide access.
1.4 Road Surface -Settlement, Potholes, Mush Spots, or Rut: Any surface defect that
exceeds 6 inches in depth and 6 square feet in area. In general, any surface defect that
hinders or prevents maintenance access.
Maintenance Necessary to bring to Standard: Repair road surface uniformly smooth with
no evidence of settlement, potholes, mush spots or ruts. Replace gravel surface as
necessary to return to design standards.
I.5 Road Surface -Vegetation in Right-of-way: Weeds and brush growing in the road
surface that are more than 6 inches high or less than 6 inches apart within a 400
square foot area.
Maintenance Necessary to bring to Standard: Remove or cut weeds and brush to 2
inches in height, and clear road surface to allow maintenance access.
I.6 Shoulders and Ditches -Erosion Damage: Erosion within 1 foot of the roadway of
more than 8 inches wide and 6 inches deep.
Maintenance Necessary to bring to Standard: Repair shoulder so that it is free of erosion
and match surrounding road.
19
J. Other -Specific to Retention/Detention Ponds (including Infiltration>
(See Figures A-6 and A-7 in Appendix)
Definition: A stormwater facility designed to store runoff while gradually releasing it at a pre-
determined controlled rate to surface water or by evaporation, plant transpiration or infiltration
into the soil designed so that no runoff entering the facility will be discharged as surface water.
Maintenance Problem and Number:
J.1 Trash & Debris: Trash and debris exceeding 1 cubic foot per 1,000 square feet (this is
about equal to the amount of trash it would take to fill one standard size garbage bag), or
there is visual evidence of dumping.
Maintenance Necessary to bring to Standard: Clear trash and debris from site.
J.2 Poisonous Vegetation: Any poisonous vegetation that may constitute a hazard to City
personnel or the public. Examples of poisonous vegetation Include tansy ragwort, poison
oak, stinging nettles, or devils club.
Maintenance Necessary to bring to Standard: Remove all poisonous vegetation so that
none are present where City personnel or the public might normally be. Cali and
coordinate with the City of Yelm.
J.3 Pollution: Oil, gasoline, or other contaminants that could: 1) cause damage to plant,
animal, or marine life; 2) constitute a fire hazard; 3) be flushed downstream during
rainstorms.
Maintenance Necessary to bring to Standard: Remove all contaminants so that none are
present. Call the your jurisdiction for waste disposal information and also notify them of
the contaminant problem.
J.4 Un-mowed Grass/Ground Cover (not including Infiltration, See J.17): If a facility is
located in a private residential area, mowing is needed when grass exceeds 18 inches in
height. In other areas, the general policy is to make the pond site match adjacent ground
cover and terrain as long as there is no interference with the function of the facility.
Maintenance Necessary to bring to Standard: Mow grass/ground cover to 4 inches in
height.
J.5 Rodent Holes: Any evidence of rodent holes, if facility is acting as a dam or berm, or
any evidence of water piping through the dam or berm via a rodent hole.
Maintenance Necessary to bring to Standard: Ensure that rodents are destroyed and
dam or berm is repaired. Call the City of Yelm and notify them of the problem.
J.6 Insects: When insects such as wasps and hornets interfere with
maintenance activities.
Maintenance Necessary to bring to Standard: Ensure that insects are destroyed and
removed from the site.
20
J.7 Tree Growth: Tree growth does not allow maintenance access or interteres with
maintenance activity (i.e., Slope mowing, silt removal, vactoring or equipment
movement). If trees are not interfering with access, leave trees.
Maintenance Necessary to bring to Standard: Remove only trees that hinder
maintenance activities. Trees should not be present on or adjacent to fill embankments
that are designed to impound water more than 4 feet deep.
J.8 Erosion Damage to Side Slopes of Pond: Erosion damage over 2 inches deep where
the cause of damage is still present, or where there is a potential for continued erosion.
Maintenance Necessary to bring to Standard: Stabilize slopes by using the appropriate
erosion control measure(s); utilizing rock reinforcement, planting of grass, or
compaction.
J.9 Storage Volume -Sediment (except Infiltration -See J.14 and J.16): Accumulated
sediment that exceeds 10°/ of the designed storm pond depth. Periodic sediment
removal is critical to proper pond function.
Maintenance Necessary to bring to Standard: Clean out sediment to designed pond
shape and depth, reseed pond if necessary to control erosion. If using a vendor or
contractor, ensure that the vendor or contractor properly disposes of waste. If not using
a vendor or contractor, call the City of Yelm for disposal information.
J.10 Pond Dikes -Settlement: Any part of the dike which has settled 4 inches lower than
the design elevation, or water is visibly piping through the berms.
Maintenance Necessary to bring to Standard: Reconstruct dike to design elevation.
J.11 Emergency Overflow/Spillway -Rock Missing, Erosion, or Obstruction: Only one
layer of rock exists above native soil in an area of five square feet or larger, or any
exposure of native soil, or blockage by debris or vegetation.
Maintenance Necessary to bring to Standard: Replace rocks to design standards.
J.12 Emergency Overflow/Spillway -Does Not Control Storm Flow: Emergency overflow
or spillway is not large enough to handle heavy rainstorms.
Maintenance Necessary to bring to Standard: Increase capacity (size) of emergency
overflow or spillway so that there is no danger of flood damage to downstream private
property or City of Yelm roads. Re-evaluate design and enlarge storage, adjust control
structure, etc.
J.13 Gravel Filter Window -Sediment and Debris: By visual inspection, little or no water
flows through filter during heavy rainstorms.
Maintenance Necessary to bring to Standard: Replace gravel in filter window area.
21
J.14 Settling Ponds -Sediment: (Infiltration Only: A pond containing 6 inches or
more of sediment.
Maintenance Necessary to bring to Standard: Remove sediment completely. If using a
vendor or contractor, ensure that the vendor or contractor properly disposes of waste. If
not using a vendor or contractor, call the City of Yelm for disposal information.
J.15 Vegetation (Infiltration Only): Vegetation such as grass and weeds impedes the
infiltration function, generally when the height exceeds 18 inches.
Maintenance Necessary to bring to Standard: Mow vegetation [0 2 inches in height and
remove clippings. Remove trees and bushes where they impact the infiltrating area of
the pond.
J.16 Storage Volume -Sediment: (Infiltration Only): A percolation test performed by a
geotechnical engineer of the facility indicates that the facility is only working at 90% of its
designed capabilities, or water remains in the pond for more than 24 hours after the rain
has stopped. Frequent sediment removal in infiltration facilities is important to insure
proper function.
Maintenance Necessary to bring to Standard: Remove sediment and/or clean the facility
so that the infiltration system works according to design. If using a vendor or contractor,
ensure that the vendor or contractor properly disposes of waste. If not using a vendor or
contractor, call the City of Yelm for disposal information.
Note: Accumulated sediment that exceeds 0.25 inches per year may indicate excessive
erosion is occurring upstream of the facility or that the conveyance systems are not
being property maintained. The contributing drainage area should be checked for
erosion problems or inadequate maintenance of conveyance systems if excessive
sedimentation is noted in an infiltration facility.
J.17 InletlOutlet Pipes (Infiltration Only: Inletloutlet pipes clogged with sediment
andlor debris.
Maintenance Necessary to bring to Standard: Remove sediment and debris so that
there is no clogging or blockage in the inlet and outlet piping. If using a vendor or
contractor, ensure that the vendor or contractor property disposes of waste. If not using
a vendor or contractor, call the City of Yelm for disposal information.
J.18 Pond Dike/Berm -Settlement: Any part of the dike which has settled 4 inches lower
than the design elevation, or inspector determines that the dike/berm is unsound.
Maintenance Necessary to bring to Standard: Repair dike/berm to design specifications.
22
J.19 Gravel Filter Window -Sediment and Debris (Infiltration Only): By visual inspection,
little or no water flows through filter during heavy rainstorms, the gravel window is
clogged.
Maintenance Necessary to bring to Standard: Remove sediment and debris from the
gravel window. Replace gravel if clogged. If using a vendor or contractor, ensure that
the vendor or contractor property disposes of waste. If not using a vendor or contractor,
call the City of Yelm for disposal information.
23
O. Other - Specific to Wet Ponds (see Figures A-12 Appendix)
Definition: A stormwater facility utilizing permanent pools to water to treat stormwater runoff.
The primary treatment mechanism is settling of sediments, which results in a reduction in total
suspended solids, including soil particles as well as insoluble metals, which attach to the
particles.
Maintenance Problem and Number:
0.1 Trash & Debris: Trash and debris exceeding 1 cubic foot per 1,000 square feet (this is
about equal to the amount of trash it would take to fill one standard size garbage bag) of
pond area.
Maintenance Necessary to bring to Standard: Clear trash and debris from pond.
0.2 Vegetation: Vegetation such as grass and weeds need to be mowed. Mowing is
needed when grass exceeds 18 inches in height. In other areas, the general policy is to
make the pond site match adjacent ground cover and terrain as long as there is no
interference with the function of the facility. Mowed vegetation should be removed from
areas where it could enter the pond, either when the pond water level rises or by rainfall
runoff.
Maintenance Necessary to bring to Standard: Mow grass/ground cover to 4 inches in
height. Remove trees and bushes where they are interfering with pond maintenance
activities. Wetland plant species may require harvesting or special maintenance rather
than mowing.
0.3 InletlOutlet Pipes: Inlet/outlet pipes clogged with sediment and/or debris.
Maintenance Necessary to bring to Standard: Remove sediment and debris so that
there is no clogging or blockage in the inlet and outlet piping. If using a vendor or
contractor, ensure that the vendor or contractor property disposes of waste. If not using
a vendor or contractor, call the City of Yelm for disposal information.
0.4 Erosion Damage to Side Slopes of Pond: Erosion damage aver 2 inches deep where
the cause of damage is still present, or where there is a potential for continued erosion.
Maintenance Necessary to bring to Standard: Stabilize slopes by using the appropriate
erosion control measure(s); utilizing rock reinforcement, planting of grass, or
compaction.
0.5 Sediment: Accumulated sediment that exceeds 10% of the designed
storm pond depth or that exceeds the depth of the sediment storage area plus 6 inches,
usually within the first cell. Periodic sediment removal is critical to proper pond function.
Maintenance Necessary to bring to Standard: Clean out sediment to designed pond
shape and depth, reseed pond if necessary to control erasion. If using a vendor or
za
contractor, ensure that the vendor or contractor property disposes of waste. If not using
a vendor or contractor, call the City of Yelm for disposal information.
O.6 Pollution: Oil, gasoline, or other contaminants prevalent and are visible.
Maintenance Necessary to bring to Standard: Remove all sediment from the pond
bottom if contaminated, and skim contaminants from water surface. Call the your
jurisdiction for waste disposal information and also notify them of the contaminant
problem.
0.7 Emergency Overflow/Spillway -Rock Missing, Erosion, or Obstruction: Only one
layer of rock exists above native soil in an area of five square feet or larger, or any
exposure of native soil, or blockage by debris or vegetation.
Maintenance Necessary to bring to Standard: Replace rocks to design standards and
specifications.
0.8 Gravel Filter Window -Sediment and Debris: By visual inspection, little or no water
flows through filter during heavy rainstorms.
Maintenance Necessary to bring to Standard: Replace gravel in filter window area.
Remove sediment so that the window is free of sediment and debris and water flows
freely. If using a vendor or contractor, ensure that the vendor or contractor property
disposes of waste. If not using a vendor or contractor, call the City of Yelm for disposal
information.
0.9 Pond Dike/Berm -Settlement: Any part of the dike which has settled 4 inches lower
than the design elevation, or inspector determines that the dike/berm is unsound.
Maintenance Necessary to bring to Standard: Repair dike/berm to design specifications.
25
Q. Other -Specific to Infiltration (not including ponds) {see Figures A-13, Ala
and A-15 in Appendix)
Definition: A stormwater facility designed to store runoff while allowing it to penetrate into the
native soil.
Maintenance Problem and Number:
q.1 Plugged Air Vents: One-half of the end area of the vent is blocked at any point with
sediment and/or debris.
Maintenance Necessary to bring to Standard: Remove sediment and debris so that
there is no clogging or blockage in the vent. If using a vendor or contractor, ensure that
the vendor or contractor property disposes of waste. If not using a vendor or contractor,
call the City of Yelm for disposal information.
q.2 Storage Area -Sediment (Infiltration Tanks and Vaults Only): Accumulated sediment
that exceeds 6 inches in depth.
Maintenance Necessary to bring to Standard: Remove all sediment from the storage
area in the vault. If using a vendor or contractor, ensure that the vendor or contractor
property disposes of waste. If not using a vendor or contractor, call the City of Yelm for
disposal information.
4.3 Gaps between VaulVPipe Section (Infiltration Tanks Only): Any cracks allowing
material to enter into the facility.
Maintenance Necessary to bring to Standard: Seal all joints between tank/pipe
sections.
q.4 Tank/Pipe -Structural Damage (Infiltration Tanks Only): Any part of the tank/pipe
that is bent out of shape more than 10 % of its design shape.
Maintenance Necessary to bring to Standard: Repair or replace tank/pipe to design
standards.
NOTES:
1. Sediment accumulations of more than 0.25 inches per year may indicate excessive
erosion is occurring upstream of the facility or that the conveyance systems are not
being properly maintained. The contributing drainage area should be checked for
erosion problems or inadequate maintenance of conveyance systems if excessive
sedimentation is noted in an infiltration facility.
2. In order to access the effectiveness of the infiltration function, inspection is
recommended of downspouts, drains and catch basins during a storm. Also,
evaluate adjacent properties for damages caused by system failure. Slow water
dissipation or system backups and flooding may indicate that an infiltration system is
not adequately pertorming.
2(i
APPENDIX A
FIGURES
Dimensions and features shown in these figures are for reference only and may differ between
jurisdictions. Call City of Yelm for their standard dimensions and/or requirements for these
figures.
27
FIGURE A-1 Type I Catch Basin
"S" EXTENSION UNIT
BASE SECTION
May have solid lid)
16, 12 or 24 inches
42 inches
It f
FIGURE A-4 Debris Barrier
bars widt ends
welded to
bar-frame _
lay be removed
4' O.C.
max. bar
-spacing
Pipe coupling ~ 2" x 5" anchor strips welded
to'/.' dia. bar-frame -' a
places spaced unifo.,,~~,.:
Fasfeh with ~° non-
corrosive bolts and nuts
Nota:
1. CMP end-section shown.
'/." dia. bar-
frame _
3"-5" for 78" dia.
5"-8" for 24" dia.
7"-g" for 30" dia. 8 greater
~:
FIGURE A-5 Ditches -Common Sections
~;~
.~,..k~
Segmental (parabolic)
z~
V ~-
Curbed crowned street
Trapezoidal
~:
.~eG/%
b. ~4, ////,,'' ~~n.
\~l
Isosceles 4riangular
4. b',
FIGURE A-7 Typical Infiltration Pond
access road ~
outl
over
stru<
,existing grountl
SECTION A-A
not to style
~? t3
A~
PLAN VIEW
' not to sale
FIGURE A-12 Typical Wet Pond
access road to outlet structure
access ramp
FIRST WETPOOL CELL
25 % to 35 % of wetpool volume,
excluding access ramp
berm top
SECOND WETPOOL CELL
overflow water surface I'
emergency overflow
water surface ~F
emergency spillway per
detention facility requirements
` ~
`•~ \~~~~ -~~ -~~~- access road
• ~ outlet srr-.,ctu
•~ o a
~ _ °OCJ m
.~•C
PLAN VIEiN
not to scale
inlet pipe 8 catch basin per
detention facility requirements
berm or baffle at water
surfaceor submerged t'
below water surface
J~
~~
~,' ~ plantings required on cut
slopes for lake protection
I ~ i facilities
manhole & outlet pipe
outlet erosion control
energy dissipation
FIGURE A-13 Typical Downspout Infiltration
System
roof
drain
4" rigid ar 6" flexible
pertorated pipe
infiltration trench
PLAN VIEW
not to scale
sump w/solid lid
drain
overtlow
4" rigid or 6"flexible splash black
pertorated pipe
oaL -
-r-J - eva-
9'G`~ G Oopa°i~ popC
a washed rock ~ ~ e
~.._......_._. -.... _.....° G._..a.... c~
fine mesh screen
PROFILE VIEW
A not to Scale
filter fabric-~
oiVwater
separator
~- Cf3 sump w/solid lid
e^ i~uo~.
a Q evo a v o 000
o7oav oQ opo~
°v
. 'Ga4o~CoG
SECTION A
not to scale
compactetl hackfill
4" rigid ar 6" flexible
perforated pipe
washed rock
1 1/2"-3/4"
r~
APPENDIX B
INSPECTION/MAINTENANCE CHECKLIST
55
PRIVATE DRAINAGE FACILITY
INSPECTION/MAINTENANCE CHECKLIST
(Checklist content usetl with permission bom the City of Port Orchard "Private Drainage Facility 2003 Maintenance Checklist")
Property
Property
(Please note any name and address changes on Page 4 of this Checklist)
Property Owner or Managing
I -Checklist
Instructions for property owner/manager or maintenance vendor/contractor:
1. Refer to your site plan and component definitions in the Storm Drainage Maintenance
Manual to determine which facilities you have on your property. (On the site plan, "CB"
refers to catch basin, "CI" to curb inlet, "MH" to manhole, and "CMH" to control manhole.)
2. Within the appropriate facility type section check "yes" or "no" indicating whether you have
each facility component on your property (i.e. Type II catch basin, pipe, etc.).
3. Inspect each component for maintenance problems (refer to Storm Drainage Maintenance
Manual.)
4. In the "Meets Standard or Problems' column, list the applicable defect number (A.I, A.2,
etc.) from the Storm Drainage Maintenance Manual or write "Meets Standard" if the
component meets the standard at the time of the inspection. (NOTE: If there is more than
one component for a facility type, list each component by its number on the site plan (CB-1,
CB-2, etc.) along with the problem number. You need only list the components with
problems in this case.) Use the back page of the form or add a separate sheet if necessary.
5. Perform maintenance on all facilities that have problems in order to bring them to the
appropriate standard (refer to the Storm Drainage Maintenance Manual).
6. Check off work that has been completed and write in the date the work completed.
99- Cectifcati®a~
I, the undersigned, do hereby certify under penalty of perjury, that the inspection has been performed,
the materials nave been furnished, the services rendered, and/or the labor performed as deemed
^ecessary from the inspection to meet City of "Tacoma standazds and as indicated above.
lJate
YLB;ASE NO'pE ANY CHANGES IN
TI-IE SPACE PROVIDED HELOW:
A(iGNT OR COMMENTS IN
a
SlgnaNre (Owner/Managing Agent) Service ContraoW r Nnmc
Facility Type Component (See standards booklet) veslNO "Meets Standam" Work Completed
Retention/Detention (R/D)
7. R70 Pontl (Including
Infiltration) q, Type I Catch Basin (Inlet)
B. Type II Catch Basin (Control Manhole)
Oefnition: Natural or
manmade depression O. Flow Restrictor (located in Control Manhole)
used to store runoff.
Ma
b
l
d b D, Debris Barrier
y
e enc
ose
y a
fence. Fills when storm
E. Energy Dissipater
events occur. May not
have visible inletloutlet F. Pipe/culvert
.
May drain by infiltration
H. Fencing (Including Gate)
only (percolate into the
soil.) I. Access Road
J. Other- Specific to R/D Ponds
2. R/D Tank A. Type I Catch Basin (Inlet)
Definition: Underground B. Type II Catch Basin (Control Manhole)
large-diameter pipe used
to store runoff
Usuall C. Flaw Restrictor (located in Control Manhole)
.
y
has access at bath ends.
D. Debris Barrier
Larger tanks may have
intermediate accesses E. Energy Dissipater
through Type II catch
b F. Pipe/culvert
asin(s). Visible access
may be through 36" G. Ditch
diameter reducer. I. Access Road
K. Other- Speci/ic to R/D Tanks
3. R/0 Vault B. Type II Catch Basin (Control Manhole)
Definition: Underground G Flow Restrictor (locatetl in Control Manhole)
runoff stooge area.
Concrete
recast or D. Debris Barrier
p
poured in place. Usually, E Ener Di
9Y ssipater
access in corners and is
normally a large scale F. Pipe/culvert
storage facility. I. Access Road
L. Other- Specific to R/D Vaults
4. Conveyance A. Type I Catch Basin (Inlet)
Definition' Culverts, pipes, B' TYPe II Catch Basin (Control Manhole)
ditches, catch basins, and
manholes that pick up and
convey runoff from G Flow Restrictor (located in Control Manhole)
D. Debris Barrier
buildings and parking
areas to one of the above E. Energy Dissipater
F
R/D facilities. . Pi e
p /culvert
G . Ditch
Facility Type Component (See standards booklet) Yes/NO 'Meets Stantlam" Work Completed
Or Problem Number ~ Oate
Water Quality -Continued
5. Wet Vault B. Type II Catch Basin (Control Manhole)
C. Flow Restrictor (located in Control Manhole)
Definition: Underground
water storage area,
D. Debris Barrier
concrete precast or E. Energy Dissipater
poured in place, that
removes
ollutants from F. Pipe/culvert
p
runoff through settling H. Fencing "Including Gale)
action. Usually has access I. Access Roatl
in corners. Will always
have standing water antl M. Other- Specific to Wet Vaults
usually has divider plates.
6. Bioswale D. Debris Barrier
F. Pipe/culvert
Definition: Open channel
that is lined with grass G. Ditch
vegetation. Acts as a flier N. Other- Specifc to Bioswales
to remove pollutants from
runoff. Usually trapezoidal
with flat bottom and 3:1
side slopes.
7. Wet pond A. Type I Catch Basin (Inlet)
B. Type II Catch Basin (Control Manhole)
Definition: Natural or
manmade depression; C. Flow Restrictor (located in Control Manhole)
may be enclosetl by a D. Debris Barrier
fence. Similar to a
t
ti
/d
t
ti
tl E Energy Dissipater
re
en
on
e
en
on pon
.
Multicelled, with F. Pi e/culved
P
continually standing water. H. Fencing (Including Gate)
Removes pollutants from
runoff through settling I. Access Road
action. If a combined O. Other- Specific to Wet Ponds
retention/tletenlion antl
t
we
pond, water level will
fluctuate during storm
events.
e. Infiltration (not A. Type 1 Catch Basin (Inlet)
including ponds) B. Type II Catch Basin (Control Manhole)
DeFlnition: Undergrountl G Flow Restrictor (located in Control Manhole)
pertorated pipe, tank, or D. Debris Barrier
vault system that allows E. Energy Dissipater
runof(tc percolate back
into surrounding soil. F. Pipe
Some may have G. Ditch
associated Type 1 Catch
Basins
T
e II Catch I. Access Road
,
yp
Basins (Manholes), or O. Other- Specific to Infiltration
elements to facilitate
inspection and cleaning.
Facility Type Component (See standards 6ookleq vesMO "Meets Standard" Work
Or Problem Number
Oil/YVater Separators p.Other-
Defnition: A stormwater
treatment facility used to
remove suspended,
floating or dispersed oil
and greasy solids from
70. Filtration System
to Oil/lNater
Defnition: A system of
cartridges filled with a (See Appentlix C for manufacturer's Operation
variety of litter media that and Maintenance Guidelines far maintenance
are usually contained in requirements and manufacturer's checklists)
reults or manholes.
II-CertiTication
I, the undersigned, do hereby certify under penalty of perjury, that the inspection has been
performed, the materials have been furnished, the services rendered, and/or the labor performed as
deemed necessary from the inspection to meet City of Tacoma standards and as indicated above.
Signature (Owner/Managing Agent) Service Contractor Name
Printed Name Representative's Signature
Date
Date
PLEASE NOTE ANY CHANGES IN OWNERSHIP/MANAGING AGENT OR COMMENTS IN THE
SPACE PROVIDED BELOW:
PRIVATN DRAINAGH FACILI"I'Y
INSPECTION/MAINTENANCE CHECKLIST
Property
Property Address: ~ ',[ ~~ ._ _.
(Please note eny name and address changes on Page 4 ofthis Checklisq
1-4n1d(t~n ~~~~'~'<.
Property Owner or Managing AgenL.l-~owi.r prn ~ vl~.-~"`- aioC, Ph : ,~-j ~- ~`{'t - ~r~c
I -Checklist O
Instructions for property owner/manager or maintenance ve r/co
1. Refer to your site plan and component definitions th`e5to ge Maintenance
Manual to determine which facilities you ha eon pro n the site plan, "CR"
refers to catch basin, "CI" to curb inlet, "1~ [o m "CMH" t'o control manhole.)
2. Within the appropriate facility type Betio Yf "y s" or "no" indicating whether you have
each facility component on your (i.e. ~atch basin, pipe, etc.).
3. Inspect each component f to c s (refer to Storm Drainage Maintenance
Mauual.)
4. In the "Meets St dar lumn, list the applicable defect number (AI, A2,
etc.) from the S r tenance Manual or write "Meeks Standard" if the
compone ets the time of the ins ecfion. (NOTE: If there is more than
one com e for pe, list each component by its number on the site plan (CB-1,
CB-2, et e problem number. You need only list the components with
problems in ~ c .) se the back page of Lhe lorm or add a separate sheet if necessary.
5. Perform maintenance on all facilities that have problems in order to bring them to the
appropriate standard (refer to the Storm Drainage Maintenance Manual).
6. Check off that work has been eompteted and the date completed.
Facility'Cype Compencn[(Sec standards hooklet) VesMo `Mwh SmndarR' Work Completed
Or Problem Nmnher / Date
Retention/DeteDtioD (R/ll)
1. R/D Pond (Including A Type I Catch Basin (Inlet) ~ /'{, Z
/ j-7N.bj
Infiltration) g. Type ]] Catch basin (Control Manhole) !, F,-J
' Q l~ `~ x_9.0 0
Definition. Natural or
d
d
i
d C. Flow Restrictor (located in Control Manhole) 1( ~ ~ L. - v ~i..G~' n
manma
e
epmss
cn use
to
stare runoff Mayhe enclosed D- Dehris Ranier A ~n/~,~ _ ~ i,
_
_
by a fence. fills when storm g. Fjaergy Dissipater ~;
events occur- May net have
visible inleUcutlet. Mey F pipe/culvert F ~q ,
t'bf ~. ~. (Ci
Drain by Infilhutlon only H. Fencing (Including Gate) ) LJ ~ ~,-Zs ~ y
(soak into the soil) I. Access Road 7.
I
7ti' u 3
J. Other-Specific[o R/D Ponds K ~ ,fz / %~7~1v
2. RN Tan6 A-'Iboe I Catch Basin (Inlet)
B. Type B Catch Basin (Control MaMole)
DefintHOn: Underground
large-diameter
i
e used [e C- Flow Restrictor (located in ConVOI Manhole)
p
p
store mnofE Usually has D. Debris Barzier
access at bath ends. Larger E. Energy Dissipater
ones may have intermediate
accesses throu
h T
e II F. Pipe/culvert
-
g
yp
catch basin(s)/manhole. G. Ditch
Visihle acwss may be I. Access Road _
through 3fi" diameter
reducer.
K. Other- Specific to R/D 'Packs _
3. R/D Vaalt B. Type B Catch Basin (Control Manhole)
D
j
nffton: Under
r
d C_ Flow Restrictor (located i¢ Control Manhole)
e
g
oun
r
rumff smmge area Concrete D. Debris Barrier
precast or poured iv place.
Osuall
a
i E, pnergy Dissipater
y,
ccess
n comers
and is normally a large scale
F. Ptpe/culvert
storage facility I. Access Road
L. Other- Specific to R/U Vaults
4. Conveyance A.'I'voe I Catch Basin (Inlet) ~ C , I', / -2a-r~-i
B. Type II Catch Basin (Control Manhole) 7{
DeFttl(ios t:ulvert5, pipes,
ditches
catch basins
and G, FIOW RCan'lefol (IOCated N t)O¢1i01 e)
,
,
manholes Thal pick np and ll. Debris Barrier
convey mnofF from E. Energy Dissipater
buildings and parking areas
f F. Pipe/culvert Uk6eL `.~C{.
[he abovelUD
ro one o
facilities G. Ditch K
Yeoility Type Compovcnt ($CC standards boukleQ vas/NO 'Nnecis SranJaal" work Complema
Or Problem Number / Date
Water Oaalily
5. Wet Vault B. Type [I Catch Dasin (ConVOI Manhole) _
C- Flow Restrictor (located in Conh'oI Manhole _
Definition: Underground
D. Debris Barrier __
wares enrage area, wncrete
ce
t
d i
l
F:. Evergy Dissipater
a
,
precas
er poure
n p
the[ removes pollutants from F. PI e/culvert
mnoff thrmigh settling II. Fencing "Including Gate)
action. Usually has access in [, Access Road
comas-Will always have M. Other-Specific to Wet Vaults
standing water and usually
has divider plates.
6. Bioewale D. Debris Barrier K bd4"('M ,kA
F. Pipe/culvcnt n -, 2 / ~ la? y3
Defzni(fon: Broad open Cr
Ditch
n
channel chat is lined with .
__
grass vegetanov, which acts _
N. Other- Specific to Bioswales
;~
~f, 2 A~ 11
/ ~y _
~fTJ gip'
es a GI[er to remove
pollutants from ruvoff
Osually [rapczcidal with flat
boanm.
7. Wet pond A 7boe [Catch Basin (Inlet)
B. Type II Catch Basin (Conrol Manhole)
Defznition: Natural or G Flaw Restacror (located in Control Mavhole)
mavmade depmssion; may be ._..
enclosed by a fence. Similar D. Dehris Bamer
to a retev[ioNdetevtiov pond. p;. P.nergy Dissipater
Muldcelled, wish cuntlnuelly P Pipe/culveR
Removes
standing water
-
pollutants from mnefF --
H. Pendug (Including Gate)
tluough settling action. Ifs 1. Access Road
combined retention/detention O. Other- Specific to Wet fonds
end we[ pond, water level
will Fluctuate during storm
events.
8. luflltration (tut A. Type I Catch Basiv (inlet)
including ponds) B. Type B Catch Basiv (Control Manhole)
DefiMtiorc Gvdergromd C-Plow Reetrichm (located iv Control Mat e)
pedorn[cd pipe, [auk, or vault D. Debris Barticr
system that allows mnoff to
l
t
b
k i
t A F,nergy Dissipater
perco
a
e
ac
n
o --
surrounding soil. Same may F' PrPe
have ase'uciateA Type 1 Catch G-Ditch
Basins, Type II Catch Basins
l 1. Access Road
(Manho
es), nr elements to
O- Other- Specific to '1 n
foci )irate inspechen and
cleaning.
9. Oil/Water Separators F. Pioe/culvert _
P_ Other- ific ators
D fni[ion: A stormwater
Treatment facility used to
remove snspcndcd, floating
or dispersed oil and greasy
solids from runoff.
U