Standards for Sampling
Recommended sampling after a CMMI inspection to determine areas of moisture intrusion and a help provide a remediation strategy if needed. Sampling is not necessary prior to remediation if visible mold is present, if bioremediation is going to be performed. This is because bioremediation treats the entire property and the protocols are the same regardless of what the samples identify.
Air Samples (3 Minimum)
- Take all indoor air samples with the HVAC system operating or the fan set to on. This should be done at least 1 hour prior to sampling.
- One outside.
- Two strategically placed outside samples are necessary the building footprint is over 5000 square feet, or;
- If the environment is significantly different from one side of the building to the other.
- Two inside (minimum 1 sample per complaint area and 1 sample in a non-complaint area). This is the absolute minimum but must be adjusted for size and layout of the footprint.
- If visible mold, professionals may take a surface sample. If a surface sample is taken in an area it is normally unnecessary to also take an air sample in the same area.
Post Remediation Verification (PRV) Sampling
- Take all indoor air samples with the HVAC system operating or the fan set to on. This should be done at least 1 hour prior to the PRV testing.
- All air scrubbers should be turned off at least 12 hours prior to PRV testing.
- PRV air samples should mirror number and location of Initial Sampling.
- Surface samples are never necessary for PRV testing. If visible mold is present then remediation was not completed properly and the remediation company should be contacted immediately to return to remove the mold correctly.