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• • INDUSTRIAL HYGIENEHE SERVICES CORPORATION May 6, 2020 Mr. Rick DeGardner 640 Town Center Parkway Lino Lakes, MN 55014 Subject: Indoor Air Quality and Fungal Sampling Results Lino Lakes Police Department Lino Lakes, Minnesota IHSC Project Number: M20-694 Dear Mr. DeGardner: Industrial Hygiene Services Corporation (IHSC) conducted indoor air quality and fungal sampling at the Lino Lakes Police Department at 640 Town Center Parkway in Lino Lakes, Minnesota. Sampling occurred on April 28, 2020. Sampling and analysis were conducted in response to a black residue coming from the air handling unit diffusers and the possible presence of mold. The black dust/residue was released when the heating, ventilation and air conditioning (HVAC) system was having maintenance conducted and the air flow was set much higher than normal running conditions. MOLD ASSESSMENT CRITERIA The technical approach used for this evaluation followed standard mold evaluation protocols for the parameters included in the scope of work. The protocols and assessment criteria used to conduct the survey were based on those established by the National Institutes of Occupational Safety and Health, American Industrial Hygiene Association (AIHA), the American Conference of Governmental Industrial Hygienists, the New York City Department of Health "Guidelines on Assessment and Remediation of Fungi in Indoor Environments," Environmental Protection Agency's "Mold Remediation in Schools and Commercial Buildings," and industry practices. In each of these referenced guidance documents, a visual inspection is the most important initial step in identifying a possible contamination problem. Industrial Hygiene Services Corporation relied upon this approach in conducting an inspection of viewable and readily accessible room surfaces in conjunction with air sampling and surface sampling.