CITY
OF
Project
Highlights
The project included design and construction of
a new wastewater treatment plant at the site of existing Bull Reservoir. Bull Reservoir is a Class I dam under the jurisdiction
of the State Engineer’s Office (SEO).
The project included new pipelines which penetrated the existing
embankment dam. The pipelines were
considered a modification to the embankment dam and as such required formal
submittals, review and approvals by the SEO.
Lyman Henn planned and implemented a
geotechnical siting study for the plant.
Existing geotechnical data was reviewed and was supplemented by
additional investigations. A
design-level investigation was performed and foundation recommendations were
provided along with detailed constructability considerations. Subsurface conditions and the resulting
foundations recommendations were complicated due to an erratic bedrock surface
and abrupt differences in the nature of the overburden soils.
Lyman Henn also performed a geotechnical
evaluation of the proposed dam modifications and provided recommendations
concerning the details of pipeline design and construction to satisfy SEO
requirements.
Lyman Henn’s design services were followed
through with drilled shaft observations and backfill compaction testing during
construction.