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)
The odor was already under investigation by the Office of Building Maintenance (Plumbing). Various tasks had already been completed in association with the odor investigation. Some of these tasks included:
- Smoke testing of sanitary lines and an investigation of plumbing vent connections above the drop ceiling in the cafeteria and adjoining hallways.
- Extending the plumbing vent (located near the Air Handling Unit (AHU).
- Sealing a pipe at the entrance of the crawl space.
- Discontinued pumping of the sewer ejector pit for the outdoor restrooms (pumps to sanitary sewer main, located in front of the building).
The Office of the Environment reviewed various drawings and identifed that areas of the current cafeteria were once the kitchen. The locations of historic plumbing drains were identifed.
The crawl space was further assessed using the locations of historic drain locations as a guide. Several open pipes were identifed in the crawl space. One of which, was observed to be directly connected to the sanitary sewer and likely the primary cause of the odor concern.
To confirm this, an additional smoke test was done and the crawl space was observed during the testing (this was not previously completed). The smoke testing confirmed an opening in the sanitary sewer was located within the crawl space. Smoke was also observed coming from a manhole near the kitchen entrance. Theoretically, sewer odors could migrate from this area into school depending on pressure differentials and wind direction.
Additionally, it was recommended to spray foam an area within the crawl space to seal any possible voids for air to move between the crawl space and the occupied spaces.
On November 24, Building Maintenance (Plumbing) confirmed their contractor had completed repairs of open piping within the crawl space. Spray foam had also been applied to the decking to seal a void.
Building Maintenance (Plumbing) reported a new seal was placed on the manhole to prevent potential odor migration when the manhole is closed.
Additionally, the area was smoke tested following the sealing of open drains and the manhole. No smoke was observed.