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Upon receipt of a signed access agreement, a detailed building survey will be conducted to identify construction types and occupant background factors that may affect sample collection and results. In addition, the following will be completed to the extent practicable and with the occupants' permission as part of the building survey: • Photographs will be taken to document current building conditions and potential chemical background sources; • The building will be screened with a hand-held PID capable of detecting VOCs to aid in the detection of potential background chemical sources; and • Operation of the heating and cooling system will be documented. The results of the survey will be taken into consideration when selecting locations for the collection of indoor air sampling. Best efforts will be made to identify all containers of consumer products that potentially include VOCs, and temporarily relocate them to secure storage outside of the property,either in a lock-box,or a detached garage for a minimum of two days prior to any sampling. This will require agreement from the owner and occupants and may not be acceptable to the owner and occupants given the potential disruption to their activities. In such event, an evaluation will need to be made to determine whether indoor air sampling is appropriate to evaluate vapor intrusion potential or whether alternative methods need to be used. To the extent practical, a period of time (target 48 hours) will be allowed after the removal of potential interior sources and before the start of sample collection(length of time to be determined after discussion with building occupants). If potential background sources cannot be controlled with the cooperation of the occupants of the buildings, samples will not be collected. 2.2 INDOOR AIR SAMPLES Samples of indoor air will be collected using 6-liter Summa®canisters with a flow controller set to collect a time-integrated sample (8-hours or 24 hours depending of the risk scenario being evaluated). The canisters will be placed within the breathing zone (3 to 5 feet above the floor) and on the main floor (and potentially other areas) of the building. Samples should be collected in occupied areas likely to have the highest concentrations (e.g., areas with lower air exchange rates, basements, etc). An indoor air sampling form will be completed with each sample, and a photograph of the canister and surrounding area will be taken. 2.3 CRAWL SPACE AIR SAMPLES Samples of indoor air will be collected using 6-liter Summa®canisters with a flow controller set to collect a time-integrated sample. If access limitations exist, Summa® canisters may be placed 2 2020