Dates: September 4, 2007 to November 9, 2007.
Location: Loop 101 & 7th Street Underpass, Phoenix, AZ
Owner: City of Phoenix Engineering & Architectural Services
Contractor: Specialized Services Company (SSC).
Description: Dug a 42″ OD hand tunnel along a 340′ canal to install a 18″ OD casing for new waterline.
Challenges: 2′-3′ boulders in the path of the waterline.
Method: Hand tunneling
Results: Job finished aead of schedule. Accurate within line & grade.