Identify deficiencies that may impact IEQ and/or sources of odor concerns. Typically includes the following depending on the nature of concern, but not limited to:
- interview/questionnaire of concern individual(s)
- inspection above drop ceiling (condition of roof deck, pipe insulation, return air plenum)
- inspection of ventilation system (operation of variable air volume box and outdoor air dampers, check controls, measurements of carbon dioxide, temperature and relative humidity, sources near outdoor air intake, measure return and supply air volume, cleanliness of coils, liner and condensate pan)
- inspection of exterior
- inspection below drop ceiling (housekeeping, sink and floor drain traps, signs of past and present moisture concern via visual and/or moisture meter, mold growth, ensure connection of current and capping of abandoned sanitary vents, odorizers, excessive plants and fabric items, identify potential pathways, and measure volatile organic compounds, carbon monoxide, and lighting)
Date of Assessment(s): October 9, 2024
The Office of the Environment spoke with staff members and was informed that black debris coming from the HVAC was depositing on the equipment with the storage area for the past five months.
The staff member indicated that visible mold on equipment was observed approximately three weeks ago.
The Office of the Environment collected temperature (65.2 F), carbon dioxide (648 ppm), and relative humidity (62.1%) reading within the space.
Visible mold growth was observed on equipment within the space.
Building Maintenance (HVAC) investigated and identifed that the set point of the thermostat had been changed from 74 F to 71 F. It was also reported that the thermostat was within calibration limits. Building Maintenance reset the set point to 74 F.
Additionally, Building Maintenance (HVAC) reviewed trend data for the space and reported that the space temperatures have been in the high 60's during occupied operation. This space temperature is too low and can cause cause condensation and subsequent mold growth.
The exterior door frame was rusted, which is indicative of water intrusion.
The primary cause of the visible mold growth was likely associated with the thermostat being tampered with (lowered). This likely overcooled the space causing condensation on surfaces and subsequent mold growth.
The Office of the Environment and Building Maintenance observed Air Handling Unit (AHU) 8 which services the area:
- Filters were in good condition.
- No concerns with coils/drain pan were observed.
- The sound liner was deteriorated.
The black debris appears to be the deteriorated sound liner from the AHU. Due to particle size, this material represents a housekeeping concern.
Although likely unrelated to this concern but could eventually could impact Indoor Environmental Quality (IEQ):
- An exterior door frame was rusted.
Replace sound liner within AHU-8 to prevent further deterioration and particles being deposited. Custodial Services can vacuum this material as needed until the repairs are complete.
Building maintenance to identify and correct the cause of the rusted door frame.
A board approved restoration contractor cleaned impacted items within the area and placed an air purifier overnight. Non-impacted items were also cleaned as a precaution.
Lock box to be installed over thermostat to prevent future tampering.