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Geosptec consultants sampling to identify potential background sources and identify sample locations. These suites are located near the highest historical PCE concentrations reported in soil vapor(5,600 µg/m3 in B1),where there's a higher potential for VI and these locations represent"worst-case" Site conditions. On-Site investigation activities will be conducted in accordance with the Supplemental Guidance, which recommends the collection of indoor air, sub-slab soil vapor, and outdoor air samples to evaluate the VI potential for Site buildings (CaIEPA, 2023). Sub-slab soil vapor and indoor air samples will be compared to CaIEPA environmental screening levels (ESLs)using the default attenuation factor of 0.03. Paired sub- slab soil vapor samples and indoor air samples will also be used to develop building-specific attenuation factors to evaluate future VI potential. 3.2 Pre-Field Activities Prior to initiating intrusive fieldwork at the Site, pre-field activities will be completed including revising the Site Health and Safety Plan(HASP),procuring permits and property access approvals, and conducting a utility survey in the area of the proposed investigations. These pre-field activities are discussed in this section. 3.2.1 Health and Safety Plan Current field conditions will be reviewed by staff before commencing field activities. The assessment will include the following items: • Evaluating health and safety concerns with respect to the proposed scope of work; • Evaluating existing and previously existing utilities in relation to the proposed boring locations; • Ensuring safe access and movement within the work area; • Determining operational and traffic safety requirements; and • Assessing general health and safety hazards presented in this scope of work. After a review of the field conditions has been completed, a Site-specific HASP will be prepared. The HASP will ensure safe work practices to prepare for and minimize the possible hazards to human health and to the environment with regard to the proposed scope of work. Hazards and controls developed in the HASP will be communicated with all field personnel. 3.2.2 Permitting and Access The proposed activities will be completed both in the public right-of-way and on property owned by SGM. Geosyntec will notify and gain approval from SGM and its tenants regarding the proposed scope of work, work hours, and schedule in advance of field implementation. The following permits are anticipated to be required prior to implementation of the Work Plan scope of work off-Site and along West Hammer Lane: • Boring permits will be obtained from the San Joaquin County Environmental Health Department (SJCEHD) for each proposed boring location; 6 September 2025