Metropolitan Water District of Southern California (MWD) On-Call Engineering Services

ProjectLine provided instrumentation and mechanical engineering, and CAD design support services for chemical systems upgrades to Skinner and Diemer water treatment plants as a sub-consultant to MWH. Projects added and/or replaced sodium hypochlorite, caustic, alum/ferric, ammonia, polymer and fluorosilicic acid systems. Skinner designs added and replaced a total of 56 chemical injection points for 520 mgd Modules 1 through 6 and a new 110 mgd Module 7 expansion. ProjectLine designs included sodium hypochlorite tank farm and chemical injection, chlorine ejectors and chemical injection, and pumped mixing for injection of alum/ferric and polymer. For the Diemer plant, ProjectLine provided mechanical engineering for preliminary design of sodium hypochlorite systems for future backup disinfection, basin chlorination and filter backwash chlorination, and for air compressors. Design services for the Diemer project included civil engineering and CAD services for a large site preparation project for the Oxidation Retrofit Project. Site preparation work included relocation of existing utilities located in the area of a future ozone generation building and ozone contactors. ProjectLine also provided follow-on construction-phase engineering services including responses to Contractor questions, shop drawing reviews, on-site engineering support, and preparation of 12 Plant-Wide System Schematics for the relatively complex chemical and utility systems for the upgraded plant.