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r. <br />30 November 1998 <br />AGE -NC Project No. 95-0197 <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 />4.0. HAZARD EVALUATION <br />The following substance(s) or hazards are known or suspected to be on site. <br />SUBSTANCES INVOLVED: <br />CONCENTRATIONS: <br />Benzene <br />160 µg/1 in ground water <br />Toluene <br />0.27 mg/kg in soil <br />Ethyl -benzene <br />95 µg/1 in ground water <br />Total xylenes <br />0.54 mg/kg in soil <br />Gasoline <br />220 mg/kg in soil <br />Diesel <br />12 mg/kg in soil <br />Other organic -based products (MTBE) <br />unknown <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 and 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 hazards include:_ Slip -trip -fall hazards, noise. heavy equipment (i.e., <br />backhoe. loader. crane)vibration hazards traffic hazards etc <br />Advanced GeoEn, iron men la 1, Inc. <br />