a. Contractor shall verify the existing line is isolated; stop work and inform ONWASA if it is not. b. Remove the existing corroded 8” discharge line from the first flange above the floor in the chemical feed room to the first flange connection inside the pump room at the discharge valve, including selective demolition of a portion of the masonry unit wall between the two rooms, only as necessary to remove the pipe from the wall. c. Remove the 3” Ross Valve Back Pressure Sustaining/Relief Valve from the corroded 8” discharge line to the 90° fitting in the chemical room. d. Saw cut the concrete floor in the chemical feed room around the existing 8” ductile iron discharge pipe. e. Remove the existing 8” ductile iron discharge pipe coming through the floor down to competent piping below grade, preferably to the next flanged fitting below grade. f. Swab all interior surfaces of the new pipe and fittings with a sodium-hypochlorite solution for disinfection before installation. g. Install new 8” ductile iron piping and fittings (pressure class 350, AWWA C151, C115) with stainless steel fasteners, as required from below grade to above the concrete floor. h. Contractor is responsible for all new taps and plumbing required to hook up existing lube lines, hose bibs, and pressure transducers. i. Backfill the excavated area around the pipe with pea gravel to a level matching the bottom of the existing floor slab and tamp. j. Pour new concrete (minimum 4,000 psi strength at 28 days) around the new discharge pipe in the floor. Concrete thickness shall match the existing floor slab shall slope towards the existing floor drain. There shall be no standing water in this room after the concrete floor has been repaired. k. Install new 8” ductile iron pipe and fittings (pressure class 350, AWWA C151, C115) with stainless steel fasteners above floor to the existing discharge valve, including spools, elbows, flanges, etc. l. .Contractor is responsible for all new taps and plumbing required to hook up existing lube lines, hose bibs, and pressure transducers. m. Contractor shall provide new Koflo Retractable Injection Quills with lead-free brass shut off, 3/4" NPT Process, 1/2"Inlet, PVC, No Check Valve, QR-.75B-.5PNC-6(or approved equal). Contractor shall submit the manufacturer’s spec sheets for these items to ONWASA for approval before ordering. n. Contractor shall reconnect new chemical injection quills to the existing supply/discharge lines. Quills shall be compatible with Sodium Hypochlorite and Orthophosphate. o. Install new 3” Back Pressure Sustaining/Relief Valve, ductile iron fittings (pressure class 350, AWWA C151, C115) with stainless steel fasteners, as required from the new 8” discharge line, to the 90° fitting, including spools, elbows, flanges, etc. p. Re-grout/repair the masonry unit wall to pre-project condition once new piping is installed. q. Pressure test line for leaks; Contractor shall coordinate with ONWASA so staff can witness pressure testing. r. Prime and paint new piping and fittings with materials suitable for this application; color to be chosen by ONWASA. TEST AND START UP a. Contractor shall collect bacterial analysis after disinfection; provide a report of results to ONWASA before discharging flow into the distribution system. b. Contractor shall coordinate with ONWASA to test run reinstalled equipment to ensure proper operation before final acceptance of the work. c. Contractor will be responsible for the removal and disposal of all debris from this project. d. Contractor shall warranty work for no less than (90) days for workmanship and provide the full manufacturer’s warranty period on materials.
