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the compliance log at the end of this SSP. Appropriate personal protective equipment will be <br /> available and used, as necessary, by onsite project personnel. <br /> 4.0 SITE BACKGROUND <br /> The site is currently a fenced vacant lot located at 500 Fast Grantline Road in Tracy California. <br /> The site lies in the Central Valley of California and is located about 3,500 feet south of Highway <br /> 205 at an elevation of approximately 30 feet above mean sea level (NGVD-1929). Topography <br /> in the vicinity of the site is relatively flat, dipping slightly to the north. <br /> Previously, the site was a Mobil Oil bulk distribution plant. in August 1988, all structures were <br /> removed from the property including one underground gasoline storage tank and four <br /> aboveground diesel fuel storage tanks. Hydrocarbon concentrations in soil and dissolved-phase <br /> hydrocarbons have been detected beneath the site. <br /> 5.0 POTENTIAL HAZARDS <br /> The activities to be performed are investigative in nature. Physical and chemical hazards that <br /> may be encountered onsite include those associated with operating mechanical equipment and <br /> dealing with potentially hazardous chemicals. Probably the most immediate hazard is that of <br /> physical injury to onsite personnel from machinery. Hydrocarbons in various phases(adsorbed, <br /> dissolved, liquid, and/or vapor) may be present in the subsurface at the site. The hazard <br /> potential associated with the presence of hydrocarbons includes vapor build-up in, and/or <br /> escaping from, well bores, excavations, and contaminated soil stockpiled and moved around the <br /> site. <br /> 5.1 PHYSICAL HAZARDS <br /> Potential hazards to personal safety at the site include the following: <br /> 1. Explosion and fire <br /> Petroleum products are highly flammable. Liquid petroleum product readily vaporizes <br /> from standing pools or saturated soil. Ignition sources of any kind(e.g., engines, impact <br /> sparking, and heat or arc from inappropriate equipment or instrumentation)pose a major <br /> explosion and fire hazard. <br /> 2. Injury m n Qf drillingand-excavationi m <br /> 3. <br /> 4. Electrocution <br /> 5. Noise expgsurejTom the ggmtion of heawcguipment <br />