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he/she must obtain written approval from a physician to regain access <br /> to the site. <br /> Recordkeeping <br /> Air monitoring via industrial hygiene monitoring or direct reading <br /> instrumentation will become part of the written record. Both medical <br /> and air monitoring data will be retained for 30 years. Training records <br /> will be maintained in project files and are available for inspection at all <br /> times. Subcontractor training and medical surveillance certification <br /> will also be maintained in project files. <br /> Chemical Hazards <br /> Previous data have indicated that the chemical hazards at the site <br /> consist of petroleum hydrocarbons, VOCs, SVOCs, and PCBs. These <br /> materials may exist as free product in the soil or as impurities to <br /> subsurface soil and water. The characteristics of these materials and of <br /> some of the more important chemical constituents of these materials <br /> are discussed below. <br /> Gasoline <br /> Gasoline varies in composition, but generally consists of hexanes, <br /> heptanes, octanes, and aromatic hydrocarbons. Exposure to gasoline <br /> and other petroleum hydrocarbons can produce narcotic effects such as <br /> dizziness, headache, and giddiness similar to alcohol intoxication. <br /> Gasoline is also an irritant to the mucous membranes and can irritate <br /> the eyes, throat, and skin. The Occupational Safety and Health <br /> Administration (OSHA) permissible exposure limit (PEL) for gasoline <br /> is 300 parts per million (ppm) as an eight-hour time-weighted average. <br /> The recommended short-term exposure limit (STEL) for 15 minutes is <br /> 500 ppm. Most people can detect gasoline vapor in concentrations as <br /> low as 50 ppm via their sense of smell. Skin exposed to gasoline <br /> should be washed promptly with soap and water, and eyes should be <br /> flushed immediately with eyewash solution for a minimum of <br /> 15 minutes. Ingestion warrants immediate medical attention. <br /> Benzene <br /> Gasoline can contain 1 percent to 5 percent benzene, which is suspected <br /> of being a human carcinogen. Benzene is a colorless aromatic liquid <br /> with an aromatic odor and presents the greatest hazard during low- <br /> 6-5 <br />