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Taylor Property, Claim#3711 K475P(3/23/2021) 2 of 7 Scope of Work In the course of this project, FACS conducted the following scope of work: 1. Development of a site characterization and history(see sections above). 2. Sensory(visual and olfactory) investigation of the interior and exterior of the structure. 3. Collection of surface samples from representative surfaces for particle characterization analysis. 4. Analysis of data and report generation. The data collected in the course of the investigation are presented in this report as follows: • Appendix A: Data Collection Methodologies • Appendix B: Photographs (depicting inspection observations) • Appendix C: Sampling Results (summary tables, laboratory reports, and chain of custody forms) • Appendix D: Floor Plan Background General Information In general, the composition of smoke depends on the nature of the burning fuel (source)and the conditions of combustion. During fires, some of the most common particulates produced are soot (particles of mostly carbon created during incomplete combustion of hydrocarbons)and partially burned particulates (i.e., char and ash). During wildfires, these particulates can travel hundreds of miles and eventually settle onto the exterior of structures and potentially infiltrate into the interior of the structures through openings such as doors, windows, and vents. When smoke enters the interior of a building, smoke particles can deposit on finished surfaces (e.g., flooring,walls, windowsills, horizontal surfaces, etc.)and on the sides, tops, and back surfaces of contents. Depending on the fuel sources and distance from the fire perimeter, other indications of smoke impact may also be evident, such as smoke staining and corrosion (due to the corrosive nature of potentially acidic particles). In addition, other sources of combusted materials are common in most environments. Some example sources may include: auto or diesel engine exhaust, fireplaces, candles, gas ranges, industrial facilities, volcanoes, and many others. Undoubtedly, most surfaces will contain a background level of material sourced from fires or other combustion processes. No standards or exposure limits exist specifically for combustion related particulates that settled on surfaces. In this assessment, these particle types (i.e., char, ash, soot)are used as general indicators of potential deposition of smoke related particles and any contaminants that may be associated with them (e.g. metals, polycyclic aromatic hydrocarbons, etc.), although such associations are not well studied. Evaluation Criteria In cases of wildfire smoke impact assessments, interpretation of assessment findings and sample data, specifically particle identification, is currently based on the experience and opinion of the evaluators (no standard or proposed published standard exists). FACSs' interpretation of the data is based on FACSs' experience in assessing the impact of multiple wildfires on thousands of properties across the western www forensicanalytical.com Forensic Analytical Consulting Services