SOUTH MOUNTAIN WATER
TRANSMISSION PIPELINE
Phoenix, Arizona
Lyman Henn, Inc. provided
a feasibility study, design, and construction management services
for a 6,000 ft mixed rock and soil tunnel through South Mountain
in Phoenix , Arizona . The pipeline consisted of a 48” diameter
water transmission main from the South Mountain Reservoir to the
Foothills Water Tank to increase the water distribution system's
capacity placed in an eight ft diameter tunnel.
Our scope included detailed
explorations, preparation of a geotechnical data report and a baseline
report, and development of a design package with plans and specifications.
The tunnel was excavated with a specialized hard rock machine adapted
for occasional soil zones specified by Lyman Henn. Lyman Henn also
specified specialized pipe placement, backfill, and grouting requirements,
then worked with the Contractor and Owner to facilitate construction.
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