Utilities

Our utilities projects cover the spectrum of heavy construction for both public and private owners. Our crews have installed miles of municipal water and sewer mains throughout the West. We have built hydroelectric plants, cogeneration facilities and thermal energy systems. These projects were managed and supervised by our staff of highly skilled professional engineers and superintendents. As you will see from the case studies listed below, the depth of experience our team brings to each project allows us to formulate a complete plan to meet the daily challenges of time, environment, and project complexity.

Completed Projects

Completed Projects List:

Project:24" Pipeline Anomoly Repair - Bacon Island, CA

Owner:: Pacific Gas & Electric Company

Underground was awarded a project by PG&E to expose an existing 24” pipeline on Bacon Island, CA. The project required driving sheet piles to shore the excavation as well as a large amount of dewatering. The project was in an extremely environmentally sensitive location and our crew had to be especially diligent to avoid affecting any of the wildlife.

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Project:Valve Modification - San Mateo, CA

Owner:: Pacific Gas & Electric Company

Underground was contracted by PG&E to install a new valve actuator on the existing 24” gas main in San Mateo, CA. The project was located in the middle of a busy street right near an elementary school. The project included fabrication and installation of a blow off assembly as well as two cast in place concrete vaults.

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Project:24" Pipeline Replacement - Lodi, CA

Owner:: Pacific Gas & Electric Company

The Line-108 pipeline replacement project in Lodi consisted of the installation of 1,500 feet of 24” high pressure natural gas transmission main for Pacific Gas & Electric Company. The project was located in the agricultural lands in rural Lodi, California. Underground Construction Co., Inc. met a tight schedule that was driven by gas main outages elsewhere within the system to accommodate completion of this section of new pipeline. Several challenges were encountered, including working around the existing live pipeline within 8 feet from the new line.

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Project:Hydrostatic Testing / Pipeline Upgrades

Owner:: Pacific Gas & Electric Company

In 2012, Underground Construction Co. performed a number of hydrostatic tests for PG&E throughout Northern California to support their Pipeline Safety Enhancement Program. From Fresno to Modesto, Santa Cruz to Martinez, Lodi to Aptos Hills, we moved about the country and tested miles of existing gas lines. All projects were completed within PG&E’s tight clearance schedules.

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Project:Steel Erection - Oakland, CA Substation "D"

Owner:: Pacific Gas & Electric Company

Underground Construction Co. Inc. worked with PG&E to extend Substation D in Oakland, CA to increase power reliability for the City of Oakland and its ongoing development. The project involved installing new steel structures to support precast concrete panels. Detailed field surveys were completed on the existing structural steel to ensure all new steel would bolt up and fit precisely.

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Project:Installing Precast Electric Vault - San Jose, CA

Owner:: Silicon Valley Power

In 2012, Underground Construction Co. contracted with Silicon Valley Power to install two new transmission lines to allow an existing substation to be relocated to make way for the new 49er’s Stadium. This project involved setting 10 large vaults while trenching over two miles and installing over 110,000’ of conduit.

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Project:16" Gas Distribution Main Installation - San Francisco, CA

Owner:: Pacific Gas & Electric Company

In 2012, Underground Construction Co. installed approximately 1,240 feet of 16” steel gas main, 60 feet of 8” steel gas main, and 95 feet of 2” plastic gas main on Mission Street, Main Street, and Howard Street in downtown San Francisco.

Installing a 16” steel main in and around all of the existing utilities in the streets while complying with all of the city’s and public transportation’s permitting requirements was a challenge. Both night and day crews were mobilized to finish this challenging project ahead of schedule.

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Project:City of Berkeley Channing Way Underground Conversion

Owner:: University of California, Berkeley

The first phase of the project was a joint trench to convert overhead PG&E, AT&T, Comcast, and City of Berkeley street light lines to below ground in the 2500 block of Channing Way in downtown Berkeley. The work included installing two large vaults and 17 small boxes along with approximately 1,400 linear feet of trench. The main challenge of this phase was the tight schedule because Underground was given just four weeks from the award of contract to complete the work. Despite discovering many unknown utilities and working in the busy streets and sidewalks of downtown Berkeley, Underground completed the work on time.

The second phase of the project included installing 11 manholes and approximately 1,900 linear feet of concrete encased telecommunication and electrical duct bank and to supply power, data, and voice to the new Anna Head student housing building for the University. The majority of the trench ran straight through one of busiest streets in downtown Berkeley, so maintaining adequate traffic control for the constant stream of vehicles and pedestrians through the job site was a definite challenge that Underground’s crews were able to overcome.

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Project:Oakland CX-3 Transmission Project

Owner:: Pacific Gas & Electric Company

The Oakland CX-3 project consisted of approximately 3˝ miles of 115kV transmission duct bank connecting Substations C and X through the busy city and neighborhood streets of Oakland. The excavation varied in depth from 5 to 15 feet and the duct bank package contained four 6-inch power conduits and two 4-inch communication conduits. The project also included the installation of twelve 27x10x10-foot manholes which required the use of a crane and a three-part installation process.

The project encountered many difficulties along the way, including hundreds of unmarked/mismarked utilities, extensive reinforcement sections, and a couple of very difficult intersections to cross. The biggest challenge was digging a 33 foot long tunnel and a 31 foot deep shaft by hand underneath Substation X and into the building to the termination point. Underground was able to face these difficulties and complete the project with no lost time due to injuries.

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Project:Martin to Hunters Point 115kV Transmission Project

Owner:: Pacific Gas & Electric Company

In April of 2008, Underground Construction undertook one of its most daunting challenges yet: completing five miles of duct bank (in depths up to twenty-five feet) through neighborhoods in San Francisco and Daly City by December. The duct bank conduits included four six-inch for 115kV transmission lines and two four-inch for communications. At the ends of each electrical conduit run were large precast vaults to connect the electrical conduits.

Complicating the construction in the streets were a series of difficulties both expected and unforeseen. Among the expected are two unique city crossings: a microtunnel beneath Third Street and an excavation through an existing abandoned pedestrian walkway beneath Highway 101. Among the unexpected difficulties in the ground were boulders, running soils, wood piers and other debris, underground walkways, undetectable utilities, abandoned fuel tanks, existing conduit systems, and a railroad crossing that we had to hand tunnel. Underground was able to overcome all of these obstacles in order to complete the project on time and without safety incidents or any harm to the environment.

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Project: Yosemite Valley Integrated Utilities Project - Phase 1

Owner: National Park Service

The Yosemite Valley Integrated Utilities Project involved replacement of older existing utility lines that were experiencing failures. The new utilities consisted of 5330 linear feet of 12” to 30” waterline, 2635 linear feet of 8” to 14” sanitary sewer, 10,190 linear feet of 12” sewer force main, 11,320 linear feet of telecommunication duct bank, 7695 linear feet of electrical duct bank, 120 vaults and manholes along with crossings of Yosemite Creek and the Merced River.

Construction occurred across numerous ecologically sensitive meadows and wildlife habitats. Above normal rain and snowfall influencing the groundwater and storm runoff levels created a continuous challenge as we installed the various utilities. The Merced River Crossing occurred in two phases and required a deep shored excavation system.

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Project: Utility Relocation Project

Owner: University of Nevada @ Reno

Underground Construction was selected to relocate existing utilities to facilitate construction of the new Knowledge Center. The project included installation of 2600 linear feet of 8” water line, 2600 linear feet of electrical duct bank, 3500 linear feet of telecommunication duct bank, and 20 vaults associated with the various utilities. All the work had to be competed during summer without interrupting the schedule of classes and other University activities. Upon completion of the new utilities, Underground Construction was responsible for coordination of the existing utility shutdown and new utility tie-ins.

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Project: UC Berkeley Underground Utilities Project

Owner: University of California, Berkeley

The project included the installation of 1850 linear feet of doubled-walled 6” steam and 3” condensate piping, 900 linear feet of 8” sanitary sewer, 850 linear feet of 8” storm drain piping, 1600 linear feet of concrete encased telecommunication / electrical duct bank and the associated manholes and/or vaults. Many of the steam vaults installed required bypassing the existing system, removing the old dilapidated vault, and replacing it with a new pre-cast vault. These new steam and condensate vaults required an extensive amount of mechanical fit-up, welding and copper brazing at each location.

The majority of our work took place between occupied classrooms and buildings requiring deep shored excavations for the installation of multiple dry and wet utilities. Due to the age of the campus (Built in 1868), the location / routing of many of the existing facilities was unknown. This presented many challenges requiring Underground Construction Co. Inc. to work in conjunction with UC Berkeley’s engineering staff to design and layout many of the new facilities in the field adapting to the existing conditions.

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Project: Steam Lines and Utility Corridors

Owner: Stanford University

Underground Construction has had a year-to-year ongoing presence at Stanford University, placing miles of condensate steam lines and utility corridors for the main campus as well as the linear accelerator. These jobs have involved working in existing steam tunnels (up to 150 degrees in temperature) and backfilling with special thermal layers. All Stanford projects have been constructed under tight scheduling windows in order to complete work prior to the fall class schedule.

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Project: Underground Utility District No. 233 Rule 20 Conversion

Owner: City of Oakland

Underground Construction Co. Inc. was awarded a contract by the City of Oakland to convert existing overhead electrical and telephone cables to below ground. Underground installed infrastructure for AT & T, Pacific Gas & Electric, and Comcast, in addition to the City of Oakland’s street lighting facilities in the McCarthur Blvd. neighborhoods. Underground crews performed over 46,000 feet of trenching to install electric, telephone and cable installation, over 3,000 feet of gas distribution, and installed over 1,300 manholes and boxes throughout congested urban neighborhoods.

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Project: Alviso Pond A6 Tower Replacements

Owner: Pacific Gas & Electric Company

Underground Construction Co. Inc. was hired by PG&E to replace 9 concrete foundations for a 500 kV Transmission Power line through the Alsvio Ponds in the southern part of the San Francisco Bay. Underground constructed approximately 5 miles of temporary roadway, formed and poured 9 concrete foundations, and constructed wooden walkways to each foundation. Despite having to work through an extremely sensitive marsh land and avoiding a protected a nesting habitat, the project was successfully constructed on time and under budget.

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Project: Martin – Jefferson 230 kV Underground Transmission Project

Owner:   Pacific Gas & Electric Company

Underground Construction Co. Inc. began work on installing approximately 52,000 feet of underground electrical duct bank for PG&E in South San Francisco, Colma, Daly City, San Bruno and San Mateo, California. The contract was structured into 3 segments. In addition to installing the duct bank, approximately 22 precast electric vaults (8’x20’x12’ deep) and 22 communication vaults were installed. The duct bank was installed at depths up to 16 feet deep in congested areas requiring extensive traffic control, shoring and stringent environmental restrictions.

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Project: Banks / Chapman Joint Trench Project

Owner: Pacific Gas & Electric Company

Close coordination with various neighborhood groups in a residential neighborhood was required during the installation of approximately 10,000 feet of joint trench (electric primary and secondary, telephone conduit, gas main & services, and communications conduit) for PG&E in San Francisco’s Bernal Heights. The project also involved installing the joint trench facilities, approximately 125 manholes and boxes, and making approximately 125 gas service connections.

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Project: Underground Utility District Rule 20 Conversion

Owner: City of Piedmont

Underground Construction Co. Inc. was awarded a contract by the City of Piedmont to convert existing overhead electrical and telephone cables to below ground. Underground installed infrastructure for AT&T, PG&E, and Comcast, in addition to the City of Piedmont’s street lighting facilities. Our crews performed over 11,000 feet of trenching to install electric, telephone and cable installation, and installed over 125 manholes and boxes. In addition, Underground installed new services to approximately 135 residences.

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Project: 230 kV Underground Transmission Project

Owner: Silicon Valley Power Company

This project required installation of approximately 12,000 feet of underground electrical duct bank for Silicon Valley Power Company in San Jose, California. In addition to installing the duct bank, Underground installed approximately 16 precast electric vaults (8’x20’x12’ deep) and performed 3 cased creek crossings which required extensive shoring and dewatering. The duct bank was installed at depths up to 25’ deep in congested areas requiring extensive traffic control, shoring and stringent environmental restrictions.

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