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feedwater pumps to variable frequency drives (VFD's), in order to allow variable speeds <br />for each of the feedwater pumps married up with the dedicated RO trains. All feedwater <br />pumps will have VFD's. <br />Consultant will prepare design drawings and specifications for upgrades to the existing <br />RO trains. Design documents will include membrane element replacement for the four <br />(4) existing RO trains. Consultant will design necessary changes to RO train array to <br />optimize RO train performance. Consultant will design the pressure vessel replacement, <br />modifications to the train process piping, sample and status panel modifications/upgrades, <br />and process valve replacement based on findings from the condition assessment. Process <br />piping will be upgraded from PVC to 316 stainless steel. <br />Consultant will prepare demolition plans for the existing RO trains, including phasing of <br />piping connections and associated equipment. <br />Consultant will prepare design drawings and specifications for replacement and upgrades <br />to the existing clean -in-place (CIP) system. The drawings will propose demolition of the <br />existing CIP system and construction of a new CIP system located within the existing <br />scale inhibitor room. The CIP system will include two batching tanks, heater, mixers, <br />cleaning pump, cartridge filter, supply and return piping. Design will include new <br />process piping trench from the scale inhibitor room to the existing trench located in the <br />process room. Modifications to the CIP piping connections at each RO train will be <br />proposed to create an air gap under normal operation. Consultant will evaluate and <br />design electrical upgrades associated with CIP system improvements. <br />Consultant will review and prepare drawings and specifications for small piping <br />replacement. Piping replacement will be limited to instrument air, sulfuric acid, scale <br />inhibitor, and CO2 solution feed piping within the process building. Materials of <br />construction for each respective system will be as follows: <br />• Instrument air piping — replace existing black iron piping to be 316 stainless steel <br />• Sulfuric acid piping — Replace existing PVC/CPVC to Halar/PVDF to the <br />feedwater <br />• Investigate the use of CO2 solution feed to raw water blend in lieu of sulfuric acid <br />• Scale inhibitor — Replace existing PVC to be HDPE <br />• Investigate the addition of CO2 solution to scrubber blowdown <br />Consultant will design dual discharge piping headers for the high service pumps, with the <br />intention of replacing the existing deteriorated header piping in the trench and routing a <br />new parallel discharge header on the floor between high service pumps. <br />Consultant will design modifications to the existing finished water flow meter and vault <br />to re-route the piping above grade and include a new flow meter. The second discharge <br />main to be provided for redundancy will be designed to include a flow meter that is above <br />ground. Work will be phased to maintain operation of the WTP and high service pump <br />operations. <br />F:\Utilities\UTILITY - Engineering\WATER\WTP - South RO\19-1115 South RO Water Treatment Plant <br />Improvements\Admin\Oslo WTP Water Plant Improvements 11.25.19.docx <br />Page 3 of 9 <br />