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Clayton ENVIRONMENTAL CONSULTANTS 3.0 KEY PERSO L AND TELEPHONE NUMMERs The people primarily responsible for site safety are the Project Manager, the Project Health and Safety Officer, and the Site Safety Officer (SSO). Project Supervisor: Mike Holbrook Telephone Number: (510) 426-2616 Project Health & Safety Officer: Pamela Han Silkwood Telephone Number: (510) 426-2624 Project Site Safety Officer: Richard Silva Telephone Number: (510) 426-2650 Roles and responsibilities of the key personnel are found in Appendix B. 4.4 SITE HISTORY One 2,000-gallon diesel underground storage tank (UST) and one 10,000-gallon formaldehyde UST were removed on February 22, 1987. The formaldehyde UST had not been used for several years prior to the removal and was empty when the removal was performed. Four samples were collected during the excavation process, three soil and one water. The water sample collected during the UST removal reported diesel at 1,500 milligrams per kilogram (mg/kg). However, another sample collected on April 17, 1987 reportedly from the same area did not detect any diesel. With the exception of reported low levels of motor oil in the 2,000-gallon tank soil sample, all other samples reported contaminants at nondetectable levels. The samples were not analyzed for formaldehyde. 5.0 FIELD ACTIVITIES One monitoring well downgradient from the area of the tank excavation will be installed to depths of approximately 20 feet below ground surface (bgs). Soil samples will be collected at 5 feet bgs intervals. One groundwater sample will be collected once the well is installed and developed. 6.0 CHEMICAL HAZARDS The concerned contaminants identified onsite are diesel and diesel constituents and formaldehyde. Diesel and diesel constituents are absorbed through inhalation, skin contact, and ingestion exposures. Human exposure through excessive inhalation of diesel aerosol can cause respiratory tract irritation, headache, dizziness, nausea, vomiting, and loss of coordination. Vomiting and renal involvement may occur after ingestion. Prolonged or repeated skin contact may irritate hair follicles and block sebaceous glands, producing a rash of acne pimples and spots. Diesel is classified as a Class B2 carcinogen by the USEPA_ It is a questionable carcinogen with experimental neoplastic and tumorigenic data. Diesel has human mutation data. 2 ENGW952-XHSP