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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: CONCENTRATIONS: <br /> Benzene 160µg/l in ground water <br /> Toluene 0.27 mg/kg in soil <br /> Ethyl-benzene 95 ,ug/l in ground water <br /> Total xylenes 0.54 mg/kg in soil <br /> Gasoline 220 mg/kg in soil <br /> Diesel 12 mg/kg in soil <br /> Other organic-based products (MTBE) 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-fall hazards, noise. heavyquipment (i.e.. <br /> backhoe. loader. crane). vibration hazards,traffic hazards. etc. <br /> Advanced GeoEnvironmenhl,Inc. <br />