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determined that an OSHA health and safety Level "D" environment will be present on the project. This health and safety plan is presen ed in Appendix I of this workplan. This plan may be modified as additional information is developed during the investigation. The soil borings will be drilled using a drilling rig Equipped with a minimum 10 inch diameter hollow-stem auger. The drilling contractDr will have at a minimum a California Contractor License Board C-57 specialty license with a hazardous materials removal specialty. Soil samples will be collected at 10-foot intervals or as appropriate and at lithologic contacts in all borings using a California modified split-spoon sampler fitted with clean brass sleeves. Soil samples designated for possible laboratory analysis will be sealed and placed in iced storage. A soil sampling proto of is presented in Appendix ll. Selected soil samples from the borings and/or exploratory trenches will be analyzed by USEPA Test Method 8015 (modified) for total petroleum hydrocarbon as gasoline and/or diesel fuel and USEPA Test Method 8020 or benzene, toluene, ethylbenzene, and xylene. At least one of the Test Method 8020 samples will be analyzed for methyl tertiary butyl ether (MTBE). These analyses will be performed by a California state- certified analytical laboratory. Logs will be prepared for each soil boring by a California Registered Geologist. The logs will depict the lithologies penetrated, analytical sample locations, and any descriptions of hydrocarbon contamination encountered. These logs will include a description of drilling methods and sampling techniques. All geological work will be conducted under the oversight of a California Registered Geologist. All geologic logs and associated field work will conducted in accordance with standards established by the Tri-Regional Board Guidelines for Hydrocarbon Site Assessment and Remediation (CRWQCB, 1991). 4