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9 <br /> Modifications to HVAC system; includes such items as elimination $62,000.00 <br /> of chiller and installing direct expansion rooftop units; install a single <br /> cast iron boiler in lieu of multiple packages; change controls. (Note: <br /> The estimated increase in annual energy costs associated with this <br /> change is$3,885, which represents a 20-year payback. This is four <br /> times as long as the Department of Energy standard.) <br /> Reduction as a result of floor plan revision $3,680.00 <br /> Change brand of plumbing fixtures $2,300.00 <br /> Change to PVC plumbing waste and vent,from cast iron $6,400.00 <br /> Sub total HVACIPlumbing contract revisions: $74,380.00 <br /> Electrical contract: <br /> Reduction as a result of floor plan revision $2,490.00 <br /> Sub total Electrical contract revisions: $2,450.00 <br /> Total contract revisions: $537,200.00 <br /> Estimated sales tax amount which Is reimbursed to the County by $71,500.00 <br /> the State(This amount is included in the bid amounts and will be <br /> included in the contract amounts, but will be shown as an offset <br /> expense item in the project account.The net effect of taxes paid is <br /> $0 since they are completely reimbursable by the State.) <br /> Total amount of credits against original bid amounts j $09,700.00 <br />