The Sacramento Regional County Sanitation District (SRCSD) has spent almost $1 billion dollars to rehabilitate and add new processes to the 181 MGD wastewater treatment plant in Elk Grove, CA. One of these projects was the rehabilitation of 24 secondary sedimentation tanks currently in operation. W. M. Lyles Co. (WML) was awarded the first two contracts to rehabilitate five of the tanks for $4 million dollars.

The tanks are 130’ in diameter, each containing a rotating mechanism which removes sludge from the process flow. They also utilize an atypical painted steel effluent launder system which is suspended by a “spider web” of structural beams; far different from a conventional concrete effluent launder. The rehabilitation work included the replacement of mechanism components with corrosion-resistant materials, addition of new member supports, blasting and recoating of the existing metals, lead abatement, and repairing corroded concrete surfaces. This rehabilitation will allow these tanks to effectively treat sewage for another 15 years.

Both projects have achieved stellar success through outstanding execution of the work by WML’s Foremen, Troy Pitts and Larry Larsen, effective pre-planning and sequencing by Project Manager, Jon Shugarte, and timely performance of a challenging blasting and coating operation by Jeffco Painting.