13691-015.1 Bissell Point WWTF Trickling Filter Media Replacement Phase II (RE-BID)

The work to be done under these Contract Documents generally consists of the removal of approximately 902,000 cubic feet of PVC trickling filter media and surface grating from two trickling filters, each 134-ft diameter by 32-ft media depth, and replacement with new media and grating; removal of trickling filter wall liner system and replacement with new liner system; the geomembrane liner portion of the liner system is District-supplied; removal of one trickling filter center mast, and replacement with new center mast; the new center mast is District-supplied; repairs to FRP ductwork and replacement of supports; the new ductwork supports are District-supplied; replacement of rotary distributor drive controls, including new VFDs and panel and associated instrumentation, electrical and wiring requirements for six trickling filters; replacement of drive unit parts for two trickling filters; and concrete trickling filter repairs and recoating.