Los Angeles County, CA
Working for LA County Dept. of Public Works (LADPW), PACE provided Operations Plans for regulatory compliance, assistance 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 local (LADPH) and state (DDW) requirements. PACE provided initial assessments of the systems, worked with LADPH and DDW to develop compliance and improvement plans, and provided final design and services during construction for the improvements. Since a majority of these systems were supplied by groundwater under the direct influence of surface water, the facility designs had to comply with full surface water treatment rule requirements. Although water source and quality varied at each site, LADPW and LACFD requested that PACE develop an easy-to-operate, modular treatment design, which could be implemented at each site, using the same components, with multiple trains to meet capacity needs. PACE’s final solution, implemented at two of the sites so far, 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. A unique feature of the CT systems is that due to significant variation in water demand (sometimes near 0 GPD for months), PACE included a continuous recirculation system, which takes water from the finished water storage tanks and returns it back through the chlorine injection system, to maintain residual under all demand conditions. The use of two-stage cartage filters provides for extremely easy operation and maintenance at these remote sites. Additionally, the modularity of the treatment design provides commonality of equipment and functionality, reducing overall maintenance costs for the Fire Department.
In addition to the treatment and distribution work, PACE also designed a modular automation and monitoring system, which provides local and remote control an alarm notification at each site, with centralized SCADA communications to report operating and performance data to LACFD for permit compliance reporting to DDW.
Los Angeles County Department of Public Works