KEH Win on Las Virgenes-Triunfo JPA’s Tapia WRF and Rancho LV Composting Facility O&M CIP Project

KEH recently started work with the Las Virgenes-Triunfo Joint Power Authority (JPA) on Operations and Maintenance (O&M) Capital Improvement Program (CIP) Development for the JPA’s two wastewater facilities. The KEH Team is looking forward to working with the Authority throughout the project and providing our dedicated staff to the exceed the Authority’s needs.

The Las Virgenes- Triunfo Joint Powers authority (JPA) owns and operates two wastewater facilities: the Tapia Water Reclamation Facility (Tapia) and the Rancho Las Virgenes Composting Facility (Rancho).
Tapia was originally constructed in 1965 with a wastewater capacity of 0.5 MGD. After five (5) expansions, Tapia currently has a capacity of up to 16 MGD, but currently averages 9.5 MGD. Tapia receives wastewater and produces recycled water that is used for irrigation of public and commercial landscaping, including golf courses, schools, medians, and parks. Tapia implements the following general processes before producing recycled water effluent:


  • Vertical slatted bar screen and grit chamber
  • Vertical slatted bar screen and grit chamber
  • Primary sedimentation tanks
  • Biological secondary treatment in aeration tanks
  • Secondary sedimentation tanks
  • Flocculation and filtration
  • Disinfection


Wastewater solids generated during wastewater treatment at Tapia are pumped to Rancho using a 4-mile pipeline. These solids undergo anaerobic digestion, dewatering, composting and then are distributed to the public as Class A Exceptional Quality compost. The Rancho facility was constructed in 1994.

District has been progressing through the projects identified in their Capital Improvements Plan (CIP), which was developed by their previous Sanitation Master Plan Update in 2014 and as updated in the five year CIP. In addition, District is making minor Operation and Maintenance (O&M) improvements, as identified by their operators, using a $100,000 annual budget. Although structures, such as the primary sedimentation tanks are being addressed by CIP projects, other issues include structures that are aging, pipes that leak, coating that has failed, mechanical issues, generator problems, and general SCADA and electrical needs.


The goal of KEH’s scope is to provide the District with a concise, organized, practical list of rehabilitation projects that are prioritized, categorized by type (safety, optimization, etc.) and location, and includes a magnitude level of cost. This list should consider the impact on future projects and will incorporate input from operators and outside experts but is intended to be a high level list, not a master plan.