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10 July 2007 <br /> AGE-NC Project No. 07-1524 <br /> Page 2 of 7 <br /> i <br /> 3.0. ON-SITE CONTROL <br /> The Site Safety Officer will coordinate site access control and security.An exclusion zone will be <br /> i established approximately 10 feet around boring location work areas.No unauthorized person shall <br /> be 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 /> 1 <br /> SUBSTANCES INVOLVED: CONCENTRATIONS: <br /> Benzene Unknown <br /> Toluene Unknown <br /> Ethyl-benzene Unknown <br /> Total xylenes Unknown <br /> MTBE Unknown <br /> TPH 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(BTEX,etc.)are known <br /> or suspected carcinogens. <br /> The additional potential hazards include: Slip-trip-fall hazards, noise, heavy equipment (i.e. <br /> GeoProbe/excavator/backhoe), vibration hazards, traffic hazards etc. <br /> I <br /> y <br /> Advanced GeoEnvironmental,Inc. <br /> i <br />