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4.1.3 Access Agreements Each property owner/occupant will have the opportunity to accept or decline the VI evaluation sampling through an Access Agreement Form. 4.1.4 Follow-Up Communications Once a Nestle representative receives the signed Access Agreement Form from the property owners, follow-up telephone calls and/or personal visits to each property owner/occupant(as directed by the owner)will be made by the representatives to schedule the initial VI evaluation sampling event. If Nestle has entered into an access agreement with an owner of a tenant occupied property,then a Nestle representative may check in with the owner as needed to determine whether the tenants have changed. If an Access Agreement Form is not received or contact cannot be made to access a subject property, then a Nestle representative shall attempt to contact the owner in writing and by telephone (if possible) up to three times to inquire about gaining access. Water Board staff will be updated on the progress in obtaining access during monthly teleconference calls to be initiated at the onset of this investigation and/or as requested by Water Board staff. 4.2 BUILDING SURVEY After access has been granted to a subject property,a building survey(Appendix C)will be completed to evaluate building construction design (e.g.,slab-on grade, crawlspace, etc.),to document potential sources of volatile chemicals stored within and around the building,to evaluate possible preferential pathways into the building, and to document the condition of the building's lowest level floor and walls. Building survey activities may depend on property owner constraints but are expected to include: • Photographs of the lowest habitable level floor and walls will be taken and appended to the survey. Slab thickness will be measured once the installation of the sub-slab sampling point has been completed (see Section 4.4, below) and shall be included in the survey,where applicable. • Each accessible area of the building will be walked through and screened with a hand-held field instrument (i.e., photoionization detector[RAE Systems ppbRAE or equivalent])for products that could possibly be a source of volatile compounds. Potential preferential pathways (including plumbing related pathways) shall be identified where possible. Instrument readings and measurements will be recorded, and potential COC sources photographed. Completed building surveys will be used to determine appropriate sampling equipment and sampling locations (i.e., indoor, crawlspace, outdoor air, sub-slab soil vapor). Prior to indoor air or crawlspace sampling, potential COC sources that have been identified will be documented and requested to be removed from the building until the sampling has been completed. Removing potential sources may not be an option within some buildings (e.g., commercial/industrial buildings where potential sources are necessary for day-to-day operations). In the event potential indoor COC sources cannot be removed prior to sampling, detailed documentation will be taken of its (1) location within the building and (2) its chemical composition (e.g.,take photos of labels and obtain copy of Safety Data Sheets). 6 ALBAICH