Concern: Marriotts Ridge High School: August 1st, 2019 (CXMRHS20190000FA)

Date of IEQ Report Form
Date of Report
On July 24, 2019, the Office of Environment observed relative humidity mold growth on the backs of the seats when performing an Indoor Environmental Quality Tier II Assessment of the facility.
IEQ Investigation Process

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:  July 24, 31, August 6, 13, 16, and 19, 2019.

The mold growth observed  was not due to a current event, but considered to be from a past incident.

The seats were cleaned / disinfected initially by school custodial staff as part of their summer cleaning.

Due to random blemishes, a Board approved restoration contractor was hired to re-clean / disinfect the seats.  The contractor was able to remove additional debris/growth.

HCPSS Office of the Environment inspected both custodial and contractor work.  The mold growth has been removed, however, blemishes (i.e. fading, scuff marks, etc.) re-appear after the cleaning / disinfectant product dries.

Building Services has been informed to review the auditorium's HVAC control settings (i.e. cooling set point too low since indoor temperature was 69 degrees) during normal school year operation since measures (i.e. closed outdoor air dampers and limit hours of operation) have been implemented this summer in attempts to reduce summer relative humidity related mold growth from occurring.

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