HomeMy WebLinkAboutCorrespondence ENG 9/3/2010
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Branch Engilleering,
Inc.
Corporate- Headquarters'
(541) 746-0637
3:1.b 5~b Street
Spnngfield, OR 97477
Salem ,_Engine'ering' Office
(503i 7.79-25U
4319. Ch.err)i i\venueNE
I,eizer, OR 97303
Principah. .
M..Lane Branch. PE
Damian 'Gilbe'rt. PE
Renee Clough, PE, pLs, 'AICP
Rene' Fabricant: PE, SE
Ronald J. Demek, PE
WWW.BranchEriglrieering.com
September 2, 2010
Pacific Cascade Federal Credit Union, Inc,
1075 Oak St
Eugene OR 97401
RE: 1507 Centennial Blvd., Springfield OR
Rain Garden Operations and Maintenance Plan
To Whom It May Concern:
Attached is the Operations and Maintenance Plan for the rain garden that has been designed for
your property. Once the rain garden is constructed it is important that you follow the procedures
outlined in tlus plan to ensure the rain garden continues to provide the designed cleansing and
conveyance functions, This plan needs to be distributed to all tenants on the property and
included with any sales of a portion or all of the property.
If there are any questions now or in the future, feel free to contact me,
Sincerely,
~
Renee Clough, PE, PLS, AICP
Principal Surveyor
Branch Engineering, Inc.
Date Received: r - '3;' It)
Planner: MM
CIVIL
STRUCTURES
TRANSPORTATION
GEOTECHNICAL
SURVEYING
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Simplified Operations and Maintenance Specifications
BASINS
What To Look For What To Do
Structural Components, including inlets and outlets/overflows, shall freely convey stormwater.
;.. Clogged inlets or outlets ~ Remove sediment and debris from catch basins, trench
drains, curb inlets, and pipes to maintain at least 50%
conveyance capacity at all times.
~ Cracked drain pipes or grates ~ Repair/sea] cracks. Replace when repair is insufficient.
;.. Check dams ~ Maintain 4- to IO-inch-deep rock check dams at ]2- to
20-foot intervals.
Vegetation shall cover 90% of the facility.
;.. Dead or strained vegetation ~ Replant per original planting plan, or substitute from
SWMM Appendix FA plant list.
~ Irrigate as needed. Mulch banks annually. DO NOT
apply fertilizers, herbicides, or pesticides.
;.. Tall grass and vegetation ;.. Cut back grass and prune overgrowth 1-2 times a year.
~ Weeds ~ Manuallv remove weeds. Remove all Dlant debris.
GrowingIFilter Medium, including soil and gravels, shall sustain healthy plant cover and infiltrate within 48 hours.
~ Gullies ;.. Fill, lightly compact, and install plant vegetation to
disperse flow.
~ Erosion ;.. Replace splash blocks or inlet gravel/rock.
;.. Slope slippage ;.. Stabilize 3:] slopeslbanks with plantings from SWMM
Appendix FA.
;.. Pondin~ ;.. Rake, till, or amend to restore infiltration rate.
Maintenance Schedule:
Slimmer. Make any structural repairs. Improve filter medium as needed. Clear drain. Irrigate as needed.
Fall. Replant exposed soil and replace dead plants. Remove sediment and plant debris.
Winler. Monitor infiltration/flow-through rates. Clear inlets and outlets/overflows to maintain conveyance.
Spring. Remove sediment and plant debris. Replant exposed soil and replace dead plants. Mulch.
A Ii seasons. Weed as necessary.
Maintenance Records: Record date, description, and contractor (if applicable) for all stmctural repairs, landscape
maintenance, and facility cleanout activities. Keep work orders and invoices on file and make avai]able upon rcquest
ofthe City inspector.
Access: Maintain ingress/egress, including access roads, to design standards.
InnltrationlFlow Control: All facilities shall drain within 48 hours. Record time/date, weather, and site conditions
when ponding occurs.
Pollution Prevention: All sites shall implement best management practices to prevent hazardous or solid wastes or
excessive oil and sediment from contaminating stormwater. Contact Spill Prevention & Citizen Response at 503-823-
7180 for immediate assistance responding to spills. Record time/date, weather, and site conditions if site activities
contaminate stormwater.
Vectors (Mosquitoes & Rodents): Stonnwater facilities shall not harbor mosquito larvae or rats that pose a threat to
public health or that undermine the facility structure. Monitor standing water for small wiggling sticks perpendicular
to the water's surface. Note holes/burrows in and around facilities. Call Multnomah County Vector Control at 503-
988-3464 for immediate assistance to eradicate vectors. Record time/date, weather, and site conditiolllS when vector
activity observed.
Chapter 3: Operations and Maintenance
Portland Stormwater Management Manua/- August 1, 2008
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