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earth t',uch,„ 2 Subsurface Investigation Scope Prior to commencement of subsurface investigation activities, public utility locate services would be notified so that underground utilities can be located prior to the start of work. At the time of the site investigation, prior to the start of work, an on-site health and safety plan will be completed and signed by the on-site consultant and drillers (attached to this work plan). The proposed subsurface investigation would include advancing three sub-slab soil vapor samples in areas about the spray-paint booths and paint mixing room. Sub-slab soil vapor samples would be analyzed for volatile organic compounds (VOCs) that may have migrated into sub-slab areas as a result of spray-paint booth operations and related automobile painting activities. The Environmental Protection Agency analytical methods that may be used in this investigation are included as Attachment 1. A site plan with the approximate locations of the proposed borings is shown in Attachment 2. Boring locations may be modified based on site conditions and/or locations of existing utilities. A summary report of the investigation and analytical results would be prepared upon the completion of the field activities and receipt of the laboratory analytical report. Investigation Methods Sub-slab vapor sampling would be performed by TEG-Northern California, a California licensed driller — License Number C-57 706568, using a direct push drilling rig. Sub-slab soil vapor sampling would be performed using a roto-hammer drill, Teflon tubing, and individually cleaned and certified Summa® canisters with individual flow controllers and pressure gauges. Each boring would be backfilled and cemented with a cement grout mixture consisting of approximately 95% Portland Cement and 5% Bentonite with the surface restored using a concrete or asphalt patch. All non-disposable sampling equipment would be steam cleaned or power washed in between each boring and at the end of the sampling event. Soil spoils and cuttings as well as decontamination water would be collected and stored in a separate lidded bucket or 55-gallon drum, depending on the amount of material, and the container labeled with a "non-classified waste material" label containing information on material, site name and address, generation date, and generator and contractor contact information. A copy of this label is attached to this work plan. Waste soil and decontamination water would remain on the site until receipt of the laboratory analyses when the appropriate disposal method, such as landfill, etc., can be determined. Sample Collection Methods Sub-slab vapor samples will be collected in certified Summa® canisters with individual flow controllers and pressure gauges provided by the analytical laboratory and specific to the analysis to be performed. Sample containers will be labeled with the site name, samples designation, and date and time of collection and placed in a rigid cooler and chilled to approximately four degrees Celsius for transport to the analytical laboratory. A chain of custody will be completed for the samples and would remain under the provisions of that chain of custody until delivered to Curtis & Tompkins, Ltd. Analytical Laboratories, located at 2323 5th Street, Berkeley, California 94710. Work Plan for Limited Subsurface Environmental Sampling 2073 East Yosemite Avenue Manteca, California 95336