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SUGGESTED OPERATING PROCEDURE INDOOR AIR SAMPLING 1 OVERVIEW/PREMISE This section describes the methodology for indoor air sampling. 2 PROCEDURE Indoor air quality monitoring presents challenges that must be addressed prior to the collection of samples to ensure the data collected are representative and accurately reflect the risk level due to vapor intrusion. Risk based screening levels for many compounds are lower than typical background levels so there is a risk of compounds being identified in indoor air and being incorrectly attributed to vapor intrusion instead of background/ambient levels (Dawson and McAlary, 2009). In addition, indoor air typically contains volatile organic compounds due to background sources such as: • Occupant activities such as cooking and smoking. • Consumer products, e.g., scented candles, cleaners, beauty products, and deodorizers. • Building materials, e.g., carpets, glues, and paint. Furthermore, analysis of samples for chemicals that are not among the Facility-related chemicals will exacerbate the level of effort required to assess and communicate these background contributions. To address concerns regarding background sources within the buildings, concerted efforts will be made to remove,if possible and agreed to by the owner,any containers of products potentially containing VOCs from the interior of the properties prior to indoor air sampling and occupants will be provided with instructions to help minimize activities that might contribute VOCs to indoor air. Similarly, samplers should avoid handling hazardous substances (e.g., gasoline), using permanent markers, wearing or applying fragrances, and smoking before and during the sampling event. 2.1 SAMPLING SURVEY AND INSTRUCTION TO OCCUPANTS A survey will be conducted with any property owners and building occupants to provide relevant information, secure access agreements, review instructions to occupants and conduct a pre- sampling survey. 1 2020