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Board reviews $50,000-plus in change events for HVAC, controls and chiller noise mitigation
Summary
The board reviewed several change-event items that together increase project costs by about $50,000: a $15,950 credit for a pool-pack dehumidifier substitution, a $47,210 addition for building controls/chilled-water modules, and $17,618 to add a sound attenuator to a new chiller; staff described the work as preventive cost-avoidance and neighbor-sensitive noise mitigation.
District facilities and business staff presented several change-event proposals that would modestly adjust the cost and scope of ongoing capital work.
The items included a $15,950 credit for substituting a different pool dehumidification unit in bid package 1, a recommended $47,210 addition to bid package 3 to replace aging chilled/hot water modules and upgrade a network controller (cited as more than 20 years old), and a $17,618 add to include a sound attenuator on a new chiller tower to reduce neighborhood noise.
Facilities staff said the building-control modules feed critical signals for heating and cooling and that failure could cause operational problems during extreme weather; doing the work concurrently at multiple sites was presented as cost-avoidance. The chiller attenuator was characterized as a reasonable addition because the old unit included the attenuator and the new specification accidentally omitted it.
Board members asked what the control modules do and whether omitting the attenuator had generated noise complaints; staff replied the modules transmit sensor and control data and that the attenuator helps limit chiller noise for nearby homes. The net cost of the discussed changes was described as "about $50,000 plus" and staff framed the work as necessary to ensure warm, safe, cool and dry facilities.
These were presented as change events associated with previously-bid packages; board discussion focused on scope and long-term reliability rather than new projects.
