EcoCast Stormwater Rehab in El Cajon California

July 2015

The City of El Cajon, California, has suffered consistent long-term exposure to excessive groundwater flowers, severe corrosion, and several offset joints of corrugated metal pipe in number places. The city's stormwater system was in dire need of repair. As a result, the city put its 2013 Sewer and Storm Drain Rehabilitation project into a bid for a rehabilitation project. Inland Pipe Rehabilitation or IPR was awarded the project with a big under the engineer's estimate.

Project Scope

The scope of the project was 3,000 linear feet of pipe rehabilitation with diameters ranging from 6 to 48 inches in diameter. The pipeline was positioned under the narrow streets and pristine yards of an upscale residential neighborhood. After some project analysis, IPR and the City of El Cajon decided to open their rehabilitation options towards the geopolymer option. IPR EcoCast system using Geospray from Milliken Infrastructure Solutions was employed for the pipes more significant than 36 inches in diameter.

Project Challenges

EcoCast is a highly recommended trenchless technology for pipes greater than the Cured-In-Place Pipe requirements.

"EcoCast is ideal for a variety of applications and is especially effective for stormwater and sewer line repairs similar to the El Cajon project," explained CEO Rob McCrae. "There were several challenges and extenuating circumstances, including many sections that require extensive prep, patch, and sealing work. We were confident the EcoCast process would be effective, despite the many challenges."

One of the biggest challenges within this project was redirecting the current traffic and providing buffer zones for the team. Although there were lane closures, it is considered minimal compared to standard trench digging technologies. As for EcoCast, the construction footprint and getting the spray within the pipeline itself was minimal."

The Rehabilitation Process

The application process was monitored closely throughout the whole coating period. After the initial in-depth cleaning of the broken pipe, the Geospray application was turned on. The pump delivers the geopolymer material at a consistent rate and pressure. Once applied, it takes within 12 hours for the application to harden and for the pipeline to get back into the business.


The entire project was concluded in multiple phases. The City identified additional pipes that needed repair. The project was extended to include an additional 2,250 linear feet of rehabilitation work ranging from 18 to 40 in following the completion of the original scope.

Learn more details of the project: Trenchless Technology

Trenchless Technology Article Link

COVID-19 Update

As we work through the impacts of COVID-19, we remain committed to the health and safety of our employees and their families first. While following guidance from the Center for Disease Control (CDC), Occupational Safety and Health Administration (OSHA) and National Association of Sewer Service Companies (NASSCO), we will continue to provide service to our customers and community. We understand that these are difficult times, and we are committed to helping the community by hiring those seeking employment. If you feel that IPR could help you, follow the link to our current job opportunities.