LACFD Potable Water Treatment Systems

Los Angeles County, CA

 

Working for Los Angeles County Public Works, PACE prepared operations plans for regulatory compliance, assisted in negotiating and obtaining operational permits, and designed replacements and upgrades to potable water treatment and distribution systems for five remote project sites owned and operated by the Los Angeles County Fire Department (LACFD). These systems, some over 100 years old, had fallen into disrepair and were out of compliance with current requirements. PACE provided initial assessments of the systems, worked with the local Los Angeles County Department of Public Health (LADPH) and the state Division of Drinking Water (DDW) to develop compliance and improvement plans, and provided final design and services during construction for the improvements.

 

Many of these systems were supplied by groundwater under the direct influence of surface water. Therefore, the facility designs had to comply with full surface water treatment rule requirements. Although water source and quality varied at each site, Los Angeles County Public Works and LACFD requested that PACE develop an easy-to-operate, modular treatment design that could be implemented at each site, using the same components, with multiple trains to meet capacity needs. PACE’s solution was to design and install influent basket strainers, followed by DDW-approved two-stage cartridge filters, followed by chlorine injection and CT contactors prior to discharge to on-site water storage.

 

Due to significant variation in water demand (sometimes near 0 for months), PACE included a continuous recirculation system that takes water from the finished water storage tanks and returns it back through the chlorine injection system to maintain residual under all demand conditions. Two-stage cartage filters provide easy operation and maintenance at these remote sites. Additionally, the modular treatment design provides commonality of equipment and functionality, reducing overall maintenance costs.

 

PACE also designed a modular automation and monitoring system that provides remote control and alarm notifications at each site. Centralized Supervisory Control and Data Acquisition (SCADA) communications report operating and performance data to LACFD for permit compliance reporting to DDW.

 

Key Features:

  • Potable water treatment and distribution systems for five remote project sites
  • Groundwater under the direct influence of surface water, so the facility designs had to comply with full surface water treatment rule requirements
  • Developed compliance and improvement plans to meet current local and state requirements
  • Multi-barrier treatment approach with influent basket strainers, followed by DDW approved two-stage cartridge filters, followed by chlorine injection and CT contactors prior to discharge to on-site water storage
  • Instrumentation & Controls integration
  • Modular automation and monitoring system, which provides local and remote control and an alarm notification at each site
  • Centralized SCADA communications to report operating and performance data to LACFD for permit compliance reporting to DDW
  • Construction engineering services
Client

Los Angeles County Department of Public Works

Categories
Water Treatment