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constructed of HDPE. <br />Consultant will prepare drawings to add a second suction header pipe between the ground <br />storage tanks. The existing 14 -inch header is undersized at the existing WTP rated <br />capacity and will require an additional parallel pipe to accommodate the high service pump <br />improvements and WTP capacity increase. Consultant will prepare design for additional <br />suction pipe penetration into each of the two (2) ground storage tanks. <br />Consultant will prepare design drawings and specifications for a new liquid carbon dioxide <br />(CO2) storage tank and components, consisting of slab, tank, gas feed and vaporizer <br />system and cabinet, and electrical power feed. The new tank will provide redundant and <br />additional supply to the existing carbonic solution pressurized solution feed (PSF) systems. <br />Consultant will design grading improvements adjacent to the existing and proposed bulk <br />CO2 storage tanks. <br />Consultant will prepare design drawings and specifications for a 2nd bulk sodium <br />hydroxide tank to be located in an existing containment structure. Additional bulk storage <br />is needed for deliveries of full load of sodium hydroxide and anticipated increase in usage <br />for alkalinity improvements with reduction in Cal -Flo lime slurry usage. <br />Consultant will prepare design drawings and specifications for an additional sulfuric acid <br />feed pump skid. This additional skid will be dedicated to feedwater acidification whereas <br />the existing skid will be dedicated to permeate and raw water blend acidification. <br />Consultant will prepare specifications for motor replacement of two (2) transfer pumps. <br />The replacement motors will be of the same electrical size and will be totally enclosed fan - <br />cooled (TEFC) in lieu of the WP -1 motors currently installed and improve resiliency of the <br />post-treatment system from wind driven rain. <br />Consultant will prepare process and instrumentation diagrams (P&IDs) for each of the <br />above listed improvements. <br />Consultant will prepare electrical drawings and specifications, consisting of single line <br />diagrams, network drawings, electrical schematics and details. C&W Engineering will <br />provide the electrical design services. <br />It is estimated that an additional 16 - 17 drawings will be included and be incorporated <br />into the project set of bid documents. The documents will be prepared and be used in <br />advertising for bids. <br />Consultant will prepare design drawings, specifications, and opinion of probable <br />construction costs (OPCC) at the 60%, 90%, and bidding phase design intervals for these <br />additional system components. <br />Specifications will be provided in the 16 -division format as defined by the Construction <br />Specifications Institute (CSI). <br />F:\Utilities\UTILITY - Engineering\WATER\WTP - South RO\I9-1115 South RO Water Treatment Plant <br />Improvements\Admin\Revl DRAFT Oslo WTP Additional Scope .docx <br />Page 2 of 6 <br />