EMWD's San Jacinto Valley Interceptor

By Loren Faulkner | September 28, 2010

Eastern Municipal Water District (EMWD) is a few thousand feet into a 20,000-linear-foot upgrade of its sewage delivery system. Called the San Jacinto Valley Interceptor Sewer: Phase I, the project began in August 2007 and is scheduled for completion summer 2008.

"The current system serves a population of 60,000 in San Jacinto, but this $18-million upgrade will provide service to more than double that," said Peter Odencrans, EMWD senior public affairs officer. Funding comes from a variety of sources, including a capital improvement budget, developer fees, but eventually will be paid back by homeowner connection fees, he added. Future treatment plant expansion will increase capacity from 11 million gallons per day to 14 million gallons per day.

The Work

"We're starting at the lift station near the intersection of Sanderson and Cottonwood Ave., in San Jacinto," said Tony Sampson, one of four field foremen for BRH GarverWest, the pipeline contractor for this project. "We're using a 48-inch diameter bore pipe, then drilling out the soil, then we clamshell out the excess; we're tying-in from the Sanderson Avenue treatment facility with 48-inch Hobas (fiber crete) pipe, and from man hole number one to number two." From there, they reduce down to 36-inch and some 33-inch size to the remainder of the nearly four miles of pipe.

"The cuts run anywhere between 15- and 30-feet deep," he said. GarverWest is using a CAT 385 Excavator with a long reach for the deepest cuts. Bore pits are set up under intersections and under some existing housing front yard areas. Ayala Boring out of Fontana is doing that work.

Construction Challenges

"This project is almost four miles in length," said Gene Gay, project manager for Garver West. "So it affects a lot of major arteries for transportation in the city of San Jacinto. This takes a lot of coordination and information sharing with the public to make everything run smoothly. Currently BRH Garver West, Inc. has four different headings being bored simultaneously."

"The West side of the city has lots of sandy soil conditions," said Odencrans. "Because there is so much shoring needed, we have to shut down an entire street at times. But for the most part, we are excavating and working during the day and backfilling at night, causing the least disruption possible."

The Biggest Challenge

"Traffic is our biggest issue," said Sampson. "Sometimes, it's like the Autobahn around here. Safety is our main issue at GarverWest. We have K-rails, arrow boards, signs ... above and beyond what is required, but we want to doubly insure safety for not only our workers, but for the public traffic, as well."


BRH Garver West is using a variety of CAT excavators on site supplied by Hawthorne Machinery:

385 CAT

350 CAT

345 CAT

330 CAT

320 CAT

314 no tail swing excavator

Major Sub-Contractors

  • Ayala Boring (jack and bore)
  • Palm Canyon Contractors (asphalt and overlay)
  • B&W Precast Construction (manholes)
  • Underground Solutions, Inc. (potholing and air excavation)
  • National Coating and Lining (manhole coating and lining)
  • Allied Trench Shoring/TCS, supplying the required shoring for the project
  • Hobas Pipe, supplying the pipe for the project.