REMOVE AND REPLACE EXISTING REDUCED-PRESSURE ZONE a. Contractor shall verify the existing line is isolated; stop work and inform ONWASA if it is not. 1. This will require a shutdown of the plant and will need to be scheduled at least seven (7) calendar days in advance. 2. All materials and supplies will need to be on-site prior to the existing line being isolated. 3. The line must be returned to service by the end of the day. b. Remove the upstream 8”x4” Tee, pressure reducing valve, and true union ball valve. c. Replace 8” ductile iron gate valve d. Replace the existing 8” Reduced-Pressure Zone with pressure relief. Contractor shall submit manufacturer’s spec sheets for these items to ONWASA for approval before ordering. e. Replace 8” ductile iron gate valve. f. Replace downstream 8”x4” ductile iron tee g. Replace 2” Pressure Reducing Valve and 2” schedule 80 true union ball valve h. Plumb connection from the 2” Pressure Reducing Valve to the existing 2” service water line and the existing 2” potable water line before their respective flow meters. i. Install a 2” schedule 80 true union ball valve on the line between the service water and potable water connections. j. Replace 8” Automatic control valve. Contractor shall submit manufacturer’s spec sheets for these items to ONWASA for approval before ordering. k. Install pressure gauges upstream and downstream of the new assembly. l. Install a ¾” spigot on the same line as the upstream pressure gauge. m. Install necessary supports sufficient for the size and weight of the new assembly n. Pressure test line for leaks; Contractor shall coordinate with ONWASA so staff can witness pressure testing. o. 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 disinfect all new piping before putting it back in service. b. Contractor shall coordinate with ONWASA to test installed equipment to ensure proper operation before final acceptance of the work, including passing a post installation certified backflow test. ONWASA will be provided with documentation of the post installation certified backflow test. 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.
