John Muir Elementary School - Contech Engineered Solutions

John Muir Elementary School
Kirkland, Washington
Stormwater Infiltration
Project Team Members:
Owner: Lake Washington School District
Consulting Civil Engineer:
Coughlin Porter Lundeen
Consulting Geotechnical Engineer:
AMEC Environment & Infrastructure
Contractor: Allied Construction Associates
Technical Details:
• 17 Stormwater Management StormFilter® units
• 42” and 72” diameter CMP for concrete forms
Installation Date: Summer 2012
John Muir Elementary was built in 1970 and is named after
the well-known naturalist and conservationist. In 2010, the
Lake Washington School District decided to build a new K-5
elementary school, and wished to use sustainable, “green”
design principles for the site and building to reflect the
beliefs of the school’s namesake.
The project’s new site development involved the design
of an efficient new stormwater system. To eliminate the
high cost of underground detention vaults, consulting
civil engineer Coughlin Porter Lundeen, working with
geotechnical engineer AMEC Environment & Infrastructure,
designed stormwater quality treatment within the catch
basins before the water drained into the underground
injection control (UIC) wells.
For the right stormwater management solution, Coughlin
Porter Lundeen turned to Contech, with whom they have
enjoyed a long, successful relationship. The Contech
Stormwater Management StormFilter® was chosen because
it removes the most challenging target pollutants —
including soluble, heavy metals, oil, fine solids and total
nutrients — using a variety of sustainable media. Contech’s
StormFilter product has a proven, two-decade history, and
is available in more than 30 configurations for use across the country. Two-year maintenance cycles
mean fewer maintenance events throughout the lifetime of the system, and the one-of-a-kind, selfcleaning hood prolongs cartridge life and promotes long-term performance.
The Stormwater Management
ENGINEERED SOLUTIONS
800-338-1122 • www.ContechES.com
StormFilter
®
© 2012 Contech Engineered Solutions LLC
John Muir Elementary School
Contech worked closely with the consulting engineers to
design a system specifically to meet this project’s unique
needs. The new school infiltrates all stormwater onsite
through 60-feet-deep UIC wells, drilled deep to infiltrate
below a layer of impermeable soil strata 40 feet thick.
The UIC wells are located under catch basins and designed
to accommodate the peak storm flow rate, eliminating the
need for detention structures. Contech 42-inch and 72inch diameter corrugated metal pipe (CMP) was used for
concrete forms on the project.
Installing 17 retrofit StormFilter systems provided the water
quality treatment required by local jurisdiction, as well as a
cost savings over installing a large, underground detention
facility.
“Contech was an excellent partner to assist us with this
challenging stormwater project,” agreed J. Alan Jacobson,
P.E., Associate Principal with Coughlin Porter Lundeen.
“Through collaboration, we were able to come up with a
custom and specific stormwater treatment design to allow
the use of the UIC wells for the project.”
“Deep UIC wells were an effective low impact development (LID) tool for this site, with its limited space
and low-permeability soils at the surface,” said AMEC Environment & Infrastructure’s Todd Wentworth,
P.E., LG. “By placing the UIC wells under the catch basins and using Contech StormFilter kits, the project
avoided the high cost of underground detention vaults.”
The Stormwater Management
ENGINEERED SOLUTIONS
800-338-1122 • www.ContechES.com
StormFilter
®
© 2012 Contech Engineered Solutions LLC