20050755 Storm Drainage Rpt 03202012~ ~L~JW~ ENGINEERING, INCORPORATED
_~i~r«! ~rrelr~ireirt ~rc~.s•riona/ Je~uicer
Storm Drainage Maintenance Manual
Windshadow
14920 Berry Valley Drive SE
Yelm, Washington
Parcel Nos.
217242-0000, 2172424-0200, & 2172424-0300
Prepared For
American West Bank
4 Nickerson Street
Suite 200
Seattle. Washington 98109
March 20, 2012
BASELINE Job No. 08-104
Prepared by
Jerry A. Waldron. P.E.
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Manual content used with permission from the Clty of Port Orchard "Drainage Maintenance
Standards for Commeraal and Multi-Family Drainage Facilities,'" dated August 2001
'..' /, r ....
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Lantl Planning & Use Engineering Surveying
1970-64th Avenuo West•Tacoma. WA 96466 (253)565-4491 Fax (2531566-8563 Seatlle (206)6~J1-1120.5-------------- _
"The industry starts here"
Table of Contents
Llst of Figures 3
Project Description 3
Drainage Facility Self-Inspection 4
Resource Listing i3
Facility Key g
Site Map
10
Maintenance Components 11
Appendix A - InspectionlMaintenance Checklist
' PROJECT DESCRIPTION
The project proposal is to subdivide Parcels 217242-0000, 2172424-0200, 8 2172424-0300
' into 217 residential units composed of single-family residences and townhomes. The project
site is composed of Soil Type A -Gravelly Sandy loam and the storm design will utilize
underground Low Impact Design BMPs to discharge all runoff generated from the development
into the native permeable soils. There is a residential single-family home on-site, which will
' serve as a construction office and will be removed from the site prior to recording of the plat. A
public street connected to Tahoma Boulevard to Berry Valley Road. The site is zoned Low
Density Residential R-4.
' The 30.2-acre site is located at 14848 SE Berry Valley Rd in Yelm, WA. The subject property is
located in the NW quarter of Section 24, Township 17 North, Range 1 East, and W.M. The
project will propose a sewer S.T_E.P. system, watermain, storm drainage, and extend dry
utilities from Tahoma Boulevard.
The project improvements consist of subdividing the parcels into 175 tots for single-family
residences, a 10 open space/storm tract areas, 56-foot right of way dedication for the public
road improvements and access to the residences, and 20' wide alley way. All interior streets
shall be improved to Yelm City Standards for a Local Access Residential, including a 35-foot
paved roadway with two 7-foot parking lanes, rolled curb and gutter, and a 5-foot concrete
sidewalk on one side.
II
1
1
DRAINAGE FACILITY SELF-INSPECTION
1. How the Process Works:
Commercial and multifamily property owners within the City of University Place are responsible
for inspecting their drainage facilities as well as performing regular maintenance in accordance
with City of University Place and Washington Stale Department of Ecology standards. This
work may be done either by in-house stall or avendor/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 inspectionlmaintenance checklists must be kept on site at all times. The City may
require that you submit the inspectionlmaintenance checklist. Contact the City for submittal
requirements. See the Resource Listings on page 8 for contact information.
Here are the speciTic steps in the process:
A. Facility Identification:
Review your site plan on page 10 for drainage facilities such as a pond, lank, vault, etc. To
assist you in identifying components, refer to the definitions and sketches in this manual.
NOTE: Most systems have both 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 facilitiesicomponents using in-house personnel or a vendor/contractor. Refer to
this manual, which describes the City of University Place standards for each component and
identifies possible maintenance problems with number and description.
Report the inspection results on the enclosed inspectionlmaintenance 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 #3,
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
t 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 either no maintenance needs
were identified or the work was completed as indicated on [he checklist.
E. Submittal:
' The City may require that you submit the inspectionlmaintenance checklist. Contact the
City 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.
1 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 for permit requirements.
1
1
1
1
1
1
f
For information and assistance, contact Washington State Labor 8 Industries Consultation
Program at (206) 281-5470. Information can also be found at http:pwww.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" Allen 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
II
Measuring Storage Space/Sediment Depths
Lifting Grates/Lids
Inspection from above ground Tape Measure (12ft)
Manhole Cover Hook
Mirror on a long handle
Probing for catch basinslmoving heavy Straight-pointed bar
ob ects
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 II 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 Y. -inch Allen wrench and a catch basin grate hook or crow bar.
i
Identify the sump depth (water level).
Usiny 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 m the outlet. (Refer to the
booklet for more information)
8. Identity the sediment level.
1) Put the probe or rod in through the water until
it touches the top of the sediment. Mark it with
relation to a stationary point in the catch basin
wllh tape or chalk (Position A).
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.
a
3) The water mark left on the 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 City of University Place 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 the City of University Place at the
number below and ask for technical assistance,
Jurisdiction: City of Yelm
360.458-8406
Other Project Contacts
Developer: Viking Bank
4 Nickerson Street, Suite 200
Seattle, Washington 98109
Engineer: Baseline Engineering Inc
191064`" Avenue West
Tacoma, Washington 98466
253-565-4491
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,
Storm Drainage System Component I Abbreviation
A. Type I Catch Basin CB
B. Type II Catch Basin TIICB
D. Pipe P
E. Infiltration Gallery IG
E. 4nfittratson Trench (Private 1 Roof) PT / RT
F. Sand Filter I SF
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MAINTENANCE COMPONENTS
A. Type I Catch Basin
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 8 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 for
disposal information.
A.2 Trash 8 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 for disposal
information.
A.3 Trash & Debris (including Sediment): Trash and debris rn any rnfet or outlet prpe
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 for disposal
information.
A.4 Settlement/Misalignment: Basin settles more than t inch or has rotated more than 2
inches out of aliynmenl.
Maintenance Necessary to bring to Standard: Repair or replace basin to design
standards.
A.5 Structural Damage to Frame andlor 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'/z inch, any evidence of soil
particles or water entering the catch basin through cracks, or maintenance person
judges that the structure is unsound.
tVtaintenance Necessary to bring to Standard: Repair or replace basin fo design
standards.
A.8 Cracks in Basin Around InIeUOutiet Culverts: Cracks wider than'/z inch at the joint of
any inleUoutlet 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 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 for disposal information and notify them of the presence of
chemical pollution.
A. t 1 Catch Basin Cover Not Jn Alace: 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 718 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.
8. Type +i' Catch Sasin
Definition: A round underground concrete basin (4'- 8' diameter, 6' deep or deeper), may
contain a PROP (Flow Restrirtor/Oil Pollution Control device). These basins are also
required when larger diameter Culverts are used.
Maintenance Problem and Number:
8.1 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%.
h4aintenance Necessary to bring fo Standard: Remoa~e a!! 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
for disposal information.
6.2 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
property disposes of waste. If not using a vendor or contractor, call the City for disposal
information.
6.3 Trash & Debris (including Sediment): Distance between trash and debris build-
up from the bottom of orifice plate is less than 1-1l2 feet.
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 for disposal
information.
6.4 Structural Damage to Frame and/or Top Slabs 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.
6.5 Frame Not Sitting Flush on Top Siab: i.e., separation of more than'h 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.
B.6 Cracks in Basin WailslBottom: Cracks wider than 1!2 inch and longer than 3 feet, 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.
8.7 Cracks in Basin Around Inlet/Outlet Culverts: Cracks wider than Y, inch and longer
than 1 foot at the joint of any inleUoutlet pipe or any evidence of soil particles or water
entering the catch basin through cracks. Connections to inleUoutlet pipe are not
watertight and show signs of rust.
Maintenance Necessary to bring to Standard: Repair or replace basin to design
standards. Repair connection to pipe to become watertight.
8.8 Settlement/Misalignmenf: Basin settles more than 1 inch or has rotated more than 6
inches out of alignment.
Maintenance Necessary to bring to Standard: Repair or replace basin to design
standards.
6.9 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 for disposal information.
6.10 Pollution: Presence of any chemical pollution.
Maintenance Necessary to bring to Standard: Remove contaminants so that none are
present. Call the City for disposal information and notify them of fhe presence of
chemical pollution.
6.11 Catch Basin Cover Not In Place: Cover is missing or only partially in place. Any open
catch basin requires maintenance.
fvtaintenance Necessary to bring to Standard: Repair catch basin cover so that it is
closed.
8.12 Metal Grates -Safety Hazard: Grate with opening wider than 718 inch.
Maintenance Necessary to bring to Standard: Repair grate opening so that they meet
design standards.
6.13 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.
6.14 Metal Grates -Trash and Debris: Trash or debris that is blocking more than 20% of the
grate surface.
1
Maintenance Necessary to bring to Standard: Remove all trash and debris from grate.
B.15 Access ladder -Unsafe: Ladder is unsafe due to missing rungs, misalignment,
rust or cracks.
Maintenance Necessary to bring to Standard: Repair ladder so that It is in place and
meets design standards and allows maintenance person safe access.
D. Pipe /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:
D.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.
D.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.
D.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.
D.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.
D.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.
E. & F. Other -Specific to Infiltration & Sand Fitter
Definition: A stormwater facility designed to store runoff while allowing it to penetrate into the
native soil. Due to the high permeable soils imported sand is required below the trench of the
sand filter to reduce the infiltration rates from 20 inches/hr (3 min/in) to 2 inches/hr (30 min/in).
Maintenance Problem and Number:
E.1 Plugged Air Vents: qne-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,
tail the City for disposal information.
E.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 (or disposal
information.
E.3 Gaps between VaulUPipe 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.
E.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 nol
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 causetl by system failure. Slow water
dissipation or system backups and flooding may indicate that an infiltration system is
not adequately peKorming.
APPENDIX A
INSPECTION/MAINTENANCE CHECKLIST
DRAINAGE FACILITY
INSPECTION/MAINTENANCE CHECKLIST
(Checklist content used xnth permission fran the City of Port Orchard "Pnvate Drainage FacAity 2003 Maintenance Checklist)
Property Name:_
Property Address:_
Property Owner or
I -Checklist
Instructions for properly owner/manager or maintenance vendorlcontractor.
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,
CS-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.
l
Facility Type Component (See standards booklet) Yes/NO 'Meets Standard" Work Completed
Or Problem Number ~ Date
WaterQual' -Continued
Public:
1. Infltration (not
Including ponds) E. Infiltration Gallery
Definition: Undergrountl
or
erforated
e
tank
pip
,
p
,
vault system that allows private:
runoff to percolate back E. Roof Infiltration Trench (Provide Lol Number)
info surrounding so+7.
Some may have
assoaated Type I Catch
Basins. Type II Catch
B
i
M
h
l
as
ns (
an
o
es), or
elements to facilRate
inspection and cleaning.
Public:
2. Conveyance A. Type I Catch Basin (Inlet)
L'ef~mhon.- Culverts, pipes, B, Type II Catch Basin
dittoes, vetch basins, and
manholes that pick up and
convey runofl from Dpi e
p
buildings and parking
ereas to one of the above
RiD facilities. Private:
A. Type I Catch Basin (Inlet)
B. Type II Catch Basin (Control Manhole)
D Pipe
Water Quali
F Sand Filler
3. Filtration System
Definition: A system whero
import sand slows down
the infiurafion :ate
(See Appendix C for manufacturer's Operation
and Maintenance Guidelines for maintenance
requirements and manufacturer's checklists)
2
'
II- Certification
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 University Place standards and as indicated
above.
Signature (Owner/Managing Agent)
Printed Name
Service Contractor Name
Representative's Signature
PLEASE NOTE ANY CHANGES IN OWNERSHIP/MANAGING AGENT OR COMMENTS IN THE
SPACE PROVIDED BELOW'
3