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04 February 1999 <br /> AGE-NC Project No. 98-0520 <br /> Page 2 of 6 <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 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 /> SUBSTANCES INVOLVED CONCENTRATIONS <br /> Benzene unknown <br /> Toluene unknown <br /> Ethylbenzene unknown <br /> Total xylenes 230 micrograms per kilograms <br /> Gasoline unknown <br /> (TPH-mo) 97 milligrams per kilograms <br /> The primary hazards of each are identified as follows: <br /> 1. Hydrocarbon fuels - Components of fuels are colorless liquids with strong aromatic petroleum <br /> hydrocarbon-like odors. They are flammable and have low solubility in water. Exposure to <br /> these materials in excess of recommended exposure limits can cause mild eye,nose, and throat <br /> irritation and can produce a narcotic effect on the central nervous system. Symptoms of <br /> exposure at these concentrations include headache, nausea, drowsiness, dizziness, and loss of <br /> coordination. Certain components of gasoline (BTE&X etc.) are known or suspected <br /> carcinogens. <br /> The additional potential hazards include: Slip-trip-fall hazards noise,heayy equipment i.e. Geo robe <br /> rig), vibration hazards, traffic hazards. etc. <br /> Advanced GeoEnvironmental,Inc. <br />