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sub-slab sampling, indoor air assessments, site-specific health risk assessments, etc.—may be warranted to further assess site-specific health risks. Since the subject property is presently developed with a commercial/industrial buildings, and any future development would also be for commercial/industrial land use, comparison to commercial/industrial screening levels are most appropriate. The soil vapor results from the investigation will be compared to the DTSC-Recommended SLs under existing and future commercial building land use scenarios using attenuation factors of 0.001 and 0.0005, respectively. In the latest update to HERO Note No. 3, DTSC also recommends that screening assessments calculate soil vapor screening levels using the US EPA recommended attenuation factor of 0.03 (based on June 2015 guidance) for sub-slab soil gas and "near-source" exterior soil gas. The soil vapor results from the investigation will also be compared with the US EPA recommended attenuation factor of 0.03. A report detailing the sampling methodology and results of soil matrix, soil vapor, and groundwater sampling will be prepared, and it will provide conclusions of the assessment and recommendations. The report will include maps showing soil boring locations, soil boring logs, and laboratory reports, and will be conducted by a California Professional Geologist, which meets the credentials of an Environmental Professional under 40 CFR312.10 (b). Project Management Includes project scheduling, subcontractor coordination, laboratory work order and client correspondence. Exclusion and Assumptions • Sampling and testing of building materials for potential asbestos or lead based paint is not included in this scope of work. • No regulatory agency's supervision or oversight is applicable for this investigation. • FR will notify Underground Services Alert of the intent to excavate and use standard care to avoid potential damage to subsurface utilities, but will not be responsible for any such damage beyond what is within the scope of services promised. • The surface cover will be no thicker than 6 inches. If professional concrete coring is required due to unforeseen adverse conditions at additional charge, FR will notify the client for cost approval, prior to additional costs being incurred to the project commencement. • A 9-foot minimum overhead clearance will be available at all boring locations for adequate access. • Concrete or asphalt patch will be sufficient to refinish the ground surface at each boring location. FR will not be responsible for replacing flooring at boring locations (e.g., tiles, carpet, epoxy seal, etc.) beyond concrete or asphalt patch. 7