Walnut Creek Waste Water Treatment Plant
(EBMUD)
Client: Swinerton Builders
Oakland
East Bay Municipal Utility District (EBMUD)
undertook to upgrade the existing waste water treatment plant
in Walnut Creek with the installation of a 16 million gallon
clarifier.
The Challenge
The project involved the placement of structural loads on
soft soils that consisted of a historic fill of unconsolidated
loose silts which had been placed without supervision. Swinerton
Builders, the General Contractors for the project, subcontracted
with Condon-Johnson & Associates (CJA) to install a test
section of deep mixing to stabilize and improve the bearing
capacity under the clarifier.
The Solution
CJA opted to use the Geo-Jet® system and twin overlapping
mixing paddles as the deep mixing method for this project.
The depths mixed were up to 25’.
Overlapping auger patterns were used to achieve
a one-hundred-percent mixing of the soil mass. Mixing was
performed at the rate of 450 lbs. of cement per cubic yard
of material mixed.
The Result
The soil/cement attained an average strength of 300 psi with
a lower limit of 100 psi.
Featured Expertise:
Geo Jet
|
