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• <br />Mr. Rick DeGardner <br />Lino Lake Police Department <br />Indoor Air Quality and Fungal Sampling Results <br />IHSC Project Number: M20-694 <br />May 6, 2020 <br />Page 7 of 7 <br />dust/residue comes back then ductwork cleaning and air handler cleaning may be needed. <br />In conclusion the black dust/residue was built up in the ductwork over time and when the <br />HVAC flow was tested at a higher than normal flow the dust/residue came loose and was <br />blown out the supply diffusers. Since there is no current fungal indoor air quality problem, <br />cleaning the diffusers is our only recommendation at this time. <br />Results presented are based on analysis in accordance with currently accepted industrial <br />hygiene practices at this time and location. Other than this, no guarantee is implied or <br />intended. <br />We appreciate the opportunity to be of service to you. If you have any questions regarding <br />this report, please contact me at (651) 287-5373. <br />Sincerely, <br />INDUSTRIAL HYGIENE SERVICES CORPORATION <br />Nicholas S. Mueller <br />Senior Project Manager <br />Attachment (1). Laboratory Results and Chain of Custody <br />