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Taylor Property, Claim#3711K475P(3/23/2021) 3 of 7 United States, and review of reputable industry guidelines such as: American Industrial Hygiene Association's Technical Guide for Wildfire Impact Assessments for the OEHS Professional and the Restoration Industry Association (RIA) Guidelines for Fire and Smoke Damage Repair, 2nd Edition, 2007. Based on the background information and other technical considerations, FACS evaluates wildfire smoke impact using the following criteria: Sensory Observations In cases of 1)distinct observable smoke odor; or 2) clearly visible smoke related particulate (char, ash), smoke staining/impact, or corrosion indicative of fire related smoke particle deposition, FACS recommends cleaning and restoration of such impact. Dust Composition Sampling Results As previously stated, no standards or exposure limits exist specifically for combustion related particulate that has settled on surfaces. Settled dust is composed of a variety of particles depending on a variety of factors including but not limited to organic debris, skin cells, biological materials, minerals, metals, combustion by-products, and fibers. Samples are analyzed using various optical and electron microscopy by the Visual Area Estimation (VAE)Technique. VAE estimates the relative projected area (reported as a percentage)of a certain type of particulate relative to the total amount of particulate observed on the sample. There is inherent variability in estimates made using this technique. Currently this variability is unknown. It should be noted that this technique is not appropriate for evaluating environmental health risk. This is because the results obtained do not represent an actual concentration of particles, e.g. "X" number of combustion particles per unit area or volume. For example, if the sample mixture contains 10 combustion particles and nothing else, the area estimation would be 100%. Conversely if the sample contained a variety of other particles in the mixture, the area estimation of combustion particles would be lower(e.g. less than 100%). However, in both examples, the samples would contain 10 combustion particles available for potential exposure. Therefore, in evaluating these types of sampling results, direct conclusions on actual environmental health risk cannot be made. Based on these considerations and review of available lab data from a variety of environments, FACS reports sampling data for combustion products in dust for consideration, as follows: www.forensicanalytical.coin Forensic Analytical Consulting Services