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modifications to e�sting utilities, and building modifications, where necessary. The <br /> preliminary cost opinions will not include operating costs for new or e�sting facilities, <br /> costs for new equipment to replace old or worn out equipment, or costs for new pipe <br /> routing or new chlorine feed points unless they are necessary for the proper installation of <br /> the new equipment. <br /> Chlorine Scrubber <br /> Engineer shall evaluate the use of a new chlorine scrubber to remove and treat chlorine <br /> gas resulting from possible future accidental discharge in the existing chlorine feed room. <br /> Engineer shall evaluate both wet and dry type scrubbers. The scrubber will be sized based <br /> on Engineer's interpretation of the applicable codes. <br /> This evaluation will not include any new chlorine feed equipment or modifications to the <br /> e�sting feed equipment. The evaluation will be based on locating the scrubber in the <br /> southwest corner of the basin in place of an existing ammonia storage tank. <br /> This evaluation will include the cost of the scrubber equipment, new duct work, utilities, <br /> removal of the e�sting ammonia storage tank, modifications to the existing building, and, <br /> if necessary, a new scrubber building. <br /> Conversion to Totaltv Vacuum Driven Chlorine Feed Svstem <br /> The existing chlorine feed system operates by withdrawal of liquid chlorine from ton <br /> containers, and includes pressurized liquid chlorine equipment and piping, and pressurized <br /> chlorine gas equipment and piping between the containers and existing vacuum regulators. <br /> Chlorine feed is vacuum driven downstream from the vacuum regulators. <br /> Conversion to a totally vacuum driven feed system would require changing from liquid to <br /> gas withdrawal from the chlorine ton containers. Because gas withdrawal is slower than <br /> liquid withdrawal, gas withdrawal would require two ton containers connected on each <br /> side of th <br /> e automatic switchover e ui ment r <br /> q p ather than�ust one contamer on each side as <br /> is currently operated. Vacuum regulators would be mounted directly on the chlorine ton <br /> container tapping valves to eliminate all pressurized chlorine piping. <br /> Any chlorine leakage that might occur in the vacuum piping would be minimized because <br /> of the negative pressure in the vacuum piping system. <br /> This evaluation will include the cost of the new vacuum regulators and associated <br /> equipment, modifications to the existing chlorine equipment, and utilities. Engineer shall ' <br /> prepare a schematic and layout drawing to show the proposed arrangement of the new <br /> equipment. <br /> Automatic Shutoff Vatve Actuators <br /> A-2 <br /> City of Decatur Task Order No.3 <br /> Rev.07-25-03 <br />