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I <br /> 30 October 1999 <br /> AGE-NC Project No. 99-0645 <br /> Page 2 of 7 <br /> 3.0. ON-SITE CONTROL <br /> The Site Safety Officer will coordinate site access control and security. A exclusion zone will be <br /> established approximately 10 feet around excavation work areas. No unauthorized person shall be <br /> allowed within this exclusion area. <br /> i <br /> j 4.0. HAZARD EVALUATION <br /> The following substance(s) or hazards are known or suspected to be on site. <br /> SUBSTANCES.INVOLVED, ,.,°: F CONCENTRATIONS. <br /> Benzene Up to 9,200,ug/kg <br /> Toluene Up to 800,000,ug/kg <br /> Ethyl-benzene Up to 390,000 ,ug/kg <br /> Total xylenes Up to 3,000,000 ,ug/kg <br /> MTBE Up to 160,000 ,ug/kg <br /> Diesel Up to 21 mg/kg <br /> r !Gasoline d 1:. <br /> Up to 17,000 mg/kg <br /> The primary hazards of each are identified as follows: <br /> 1. Hydrocarbon fuels - Components of fuels are colorless liquids with strong aromatic <br /> petroleum hydrocarbon-like odors. They are flammable and have low solubility in water. <br /> Exposure to these materials in'excess of recommended exposure limits can cause mild eye, <br /> nose, and throat irritation an&can produce a narcotic effect on the central nervous system. <br /> Symptoms of exposure at these concentrations include headache, nausea, drowsiness, <br /> dizziness,and loss of coordination.Certain components of gasoline(BTE&X etc.)are known <br /> or suspected carcinogens. <br /> The additional potential hayards include: Slip-trip-fall hazards noise heayy a ui ment i.e. rig), <br /> vibration hazards traffic hazards etc! <br /> s <br /> Advanced Geotnvironmental,Inc. j <br /> i <br /> 1 <br />