2010: 30th Street 20a Transmission Undergrounding

The largest span of utility undergrounding in the history of San Diego, the 30th Street 20a Transmission Undergrounding moved 3.5 miles (20,304 feet) of overhead transmission line underground. The project, which provides a safer, more reliable energy source for the people of San Diego, received a 2009 Outstanding Civil Energy Project Award from the American … Continue reading 2010: 30th Street 20a Transmission Undergrounding

2009: Roseville Water Treatment Plant Expansion, Phase 3

In response to record growth rates, the Roseville Water Treatment Plant needed to expand from 60- to 100-million gallons per day (mgd) before demand exceeded supply. By employing sustainability measures and being sensitive to the surrounding residential community, the construction team nearly doubled the plant capacity while reducing natural resource consumption, saving time, reducing material … Continue reading 2009: Roseville Water Treatment Plant Expansion, Phase 3

2009: 30th Street 20a Transmission Undergrounding

The 30th Street 20a Transmission Undergrounding project provided a safer, more reliable energy source for the people of San Diego. The largest span of utility undergrounding in the history of San Diego, the project entailed converting a 20,304 foot-long 138kV electric transmission line from overhead to underground. The project also represents the highest voltage transmission … Continue reading 2009: 30th Street 20a Transmission Undergrounding

2009: Grant Line Road Interchange at State Route 99

Replacing an existing freeway overcrossing, one of the oldest interchanges on SR 99, while accommodating local and freeway traffic throughout construction is no small feat. Yet that’s just what Nolte did. By widening the two-lane structure to accommodate eight lanes, the new Grant Line Road interchange yielded improved traffic circulation and motorist safety on the … Continue reading 2009: Grant Line Road Interchange at State Route 99

2009: Leucadia Blvd Pedestrian and Bicycle Improvements

In the historic beach town of Encinitas, widening Leucadia Boulevard has made a huge difference to people commuting through the area and those trying to reach the ocean. Designed by Nolte, the roadway widening accommodates new bike lanes and sidewalks and incorporates roundabouts to slow traffic, making it much less dangerous for people trying to … Continue reading 2009: Leucadia Blvd Pedestrian and Bicycle Improvements