Trampas Dam is located in Mission Viejo, California and is owned and operated by the Santa Margarita Water District. The dam consisted of an earth embankment approximately 310 feet high and more than 1800 feet wide that impounds tailings for a sand mining operation. The owner underwent the process of upgrading the current dam configuration to be able to store additional water for their recycled water system. Upgrades to the facility included increasing the height of the main dam by 40 feet to a total height of approximately 350 feet and constructing new saddle dams to extend its surface area. Reconstruction work involved building a new Inlet/Outlet tunnel structure close to the Main Dams left abutment. The new Inlet/Outlet Structure consisted of a 30-inch carrier pipe encased in a 63-inch steel casing that was advanced 900 LF through the dam embankment via a microtunneling methodology. Kilduff Underground Engineering, Inc., was retained to help assist the Construction Manager, Butier Engineering, Inc., with the trenchless portion of the proposed works. KUE specifically reviewed project specifications and contractor submittals, responded to Requests for Information (RFIs) and provided construction oversight for the contractor during shaft and tunnel installation.
SAWS Upper 6 Upper Segment: Support of Excavation
The SAWS W6 project involves the construction of approximately 26,300 linear feet of 104-inch
Hobas sanitary sewer within a 144.5-inch diameter (OD) tunnel, as well as another 2,200 LF of 60-
inch Hobas within an 84.5-inch diameter (OD) tunnel. There are a total of eight construction shafts
to facilitate the work as well as small diameter laterals and other appurtenances associated with
the tunnel. KUE is responsible for preparing a pre-construction submittal for the design of shafts
2, 5, 6, 7 & 8 utilizing steel ribs and liner plates and will include break-in/out king pile support due
to ground conditions consisting of weathered to fresh bedrock of the Navarro formation. Each
shaft is circular and extends to depths ranging from 40 to 100 feet below the ground surface. The
project is currently in the design phase with construction anticipated to begin in late 2020.
Central 70: Instrumentation & Monitoring
The Central 70 Project will reconstruct a 10-mile stretch of I-70 between Brighton Boulevard and Chambers Road, adding one new Express Lane in each direction, removing the aging 57-year-old viaduct, lowering the interstate between Brighton and Colorado boulevards, and placing a 4-acre park over a portion of the lowered interstate. KUE was retained by Kiewit to develop a comprehensive Instrumentation Plan using an AMTS that monitored an array of 400 L-Bar prisms mounted to a soldier pile structure along with 3 sets of UPRR tracks running through the project site. An AMTS mounted to a steel pole recorded readings of each prism every 4 hours throughout the day in an effort to monitor potential settlement of the soldier piles and the zone that BNSF and UPRR trains pass through. After nearly 2 years of continuous daily monitoring, KUE’s scope was completed in October of 2020. When completed, the $1.2B CDOT project will dramatically alter the landscape of the 10 mile stretch of the I-70 corridor, bringing this aging highway into the 21st century and rejoining communities along the way. Construction began in September 2018 and the project is expected to be completed sometime in 2023.
Weld County Road 13/34 Intersection Improvements: Dewatering Design
The Weld County Dewatering project involved the construction of a box culvert located at the intersection of Weld County Roads 13 and 34, approximately 2 miles east of the town of Mead, Colorado. Kilduff Underground Engineering (KUE), retained by a Dewatering Contractor, designed a well point dewatering system in highly variable ground condition consisting of sand, silt, and clay. The system successfully provided dry and stable working conditions for the installation of a 16-foot wide, 5-foot-tall, and 231-foot long pre-cast concrete box culvert and KUE received a letter of recommendation from Weld County for its design and management of the dewatering project.