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(s) of Assessment: December 2 and 3, 2025
The office space is finished with drywall, block walls, carpet, casework, and a drop ceiling. The space a single supply diffuser and a return located at opposing sides of the office. The space is serviced by a Dedicated Outside Air Unit (DOAU-6).
The temperature (68.5 degrees Fahrenheit) and carbon dioxide (590 parts per million) readings were acceptable. The relative humidity (29.9%) could be considered low by certain standards but is typical for HCPSS facilities during the winter. HCPSS does not humidify via the Heating Ventilation and Air Conditioning (HVAC) system as it is not the industry standard for HVAC design for this region and it can introduce additional clinical environmental concerns (ex: humidifier fever).
No malodors were identified in the space.
Various surfaces were assessed for mold growth. No visible mold growth was observed.
The carpet and drywall was probed with a moisture meter. No elevated moisture was detected.
The space was screened with a thermal infrared camera. No thermal anomalies indicative of moisture intrusion were identified.
The space consisted of shelving with numerous items made of various plastics/rubbers.
Due to the various items, the space was screened with a Photo-Ionization Detector (PID). The PID did not detect any VOCs. No significant malodors were identifed.
It was reported that a mouse visits the space. The mouse was observed during the environmental assessment. However, it should be noted that no fecal matter or bedding material was observed.
Areas above the drop-ceiling were assessed. No concerns were identified, however some fiberglass insulation was observed adjoining the "back wall" which is an exterior wall for the courtyard. No odors were observed above the drop ceiling, nor were any obvious exposure pathways to the occupied area.
The supply diffuser was qualitatively assessed and was delivering air to the space.
The return was also assessed ("tissue test") and was under negative pressure during occupied hours.
A data logger was placed in the space for approximately one-week to measure carbon dioxide, which is an indicator of sufficient ventilation. No elevated carbon dioxide was detected during the data logging event.
The HVAC unit that serves the space was assessed:
- The filters were in good condition and no bypass was observed.
- The outside air dampers were open.
- No concerns were identifed with the coils/drain pan.
The report/identifed pest represents a potential allergen source (fur, feces, etc.). The school/custodial should continue to work with the Integrated Pest Management (IPM) department until the mouse is caught.
The area should be vacuumed regularly with a vacuum equipped with a High Efficiency Particulate Air (HEPA) filter.