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: September 18, 2019
An individual within the classroom had identified the source of the odor prior to arrival. It was indicated that the odor was emanating from the fume hood's sink. The sink is reportedly not used. This caused the sink's trap to dry-out, allowing sewer odors to backflow.
The teacher filled the drain/trap with water to eliminate the back-flow of odor earlier in the day. The odor had dissipated by the time the Office of the Environment had arrived.
While onsite, the remaining sanitary lines (above the ceiling) were inspected for proper connection. No concerns were identified.
The fume hood was turned-on and qualitatively determined to be operating properly (tissue test).
Building Services (Plumbing) also visited the site. No concerns were identified by the plumbing shop.
Administration is to ensure that Custodial or the teacher turns on the sink occasionally to re-charge the sinks trap. One-gallon of water every quarter should be sufficient, however the amount of water and time interval will vary depending on a variety of factors (temperature, humidity, hood usage, etc.).