Main Street Diversion Project

Main Street Diversion Project

The Main Street Diversion Structure routes sewage to the IRWD Michelson Recycled Water Plant and is located in San Mateo Park in the city of Irvine. This small structure has developed a slight tilt that makes it necessary to level the building. The project will install micro-piles and grade beams to level the building. This project will be completed in the spring.

Contact information: For questions or concerns, please email or call 949-453-5500. For emergencies during non business hours please call 949-453-5300 (24 hours).

 Main Street Diversion











What's Going on Now:

Week of June 19, 2017:

Work continues on the PLC panel. Acceptance of consruction is anticipated on July 24.

Week of May 22, 2017:

The contractor completed work this week. Park access has been restored. Final acceptance will take place at the June 26 board meeting.

Week of May 8, 2017:

Construction is expected to be completed within two weeks with final acceptance in June. The contractor completed the grade beams, installed the grout under the building, installed the air-tight hatch and replaced the slide gate operator. Installation of the final item, the PLC, is in progress.

Week of April 24, 2017:

Construction should be complete in mid-May, with final acceptance in June. The subcontractor completed micropile installation on April 21. Pacific Hydrotech is in the process of forming the grade beams. Items to complete include installation of the air-tight hatch and the slide gate operator.

Week of April 10, 2017:

An unexpected subsurface void was encountered while drilling the first micropile and caused the building to subside and tilt. A 3-inch wide surface fissure in the soil behind the building also developed. Staff requested the assistance of NMG Geotechnical; they recommended drilling nine exploratory holes to determine the extent of the void and filling the holes and the void with two-sack slurry.

Week of March 27, 2017:

The sub-contractor installed the test piles and they passed the compression test. A smaller drill rig was brought in and production piles were installed. The contractor is installing the grade beam rebar, dowels, and forms.

Week of March 13, 2017:

The contractor leveled the building with hydraulic jacks, removed the jacks, and installed temporary supports. Pacific Hydrotech anticipates installing the piles next week.

Week of March 1, 2017:

The contractor mobilized last week and installed project signs and temporary construction fencing.

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