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12 June 2000 <br /> AGE-NC Project No. 98-0466 <br /> Page 2 of 7 <br /> 3.0. ON-SITE CONTROL <br /> The Site Safety Officer will coordinate site access control and security. An exclusion zone will be <br /> established approximately 20 feet around drilling areas. No unauthorized person shall be allowed <br /> within this exclusion area. <br /> 4.0. HAZARD EVALUATION <br /> The following substance(s) or hazards are known at the following concentrations: <br /> SUBSTANCES INVOLVED: CONCEN'T'RATIONS: <br /> Xylenes 47 mg/kg <br /> Ethylbenzene 2.8 mg/kg <br /> Toluene 0.12 mg/kg <br /> Gasoline 450 mg/kg <br /> Diesel 7,300 mg/kg <br /> Motor Oil 130 mg/kg <br /> Copper 11,000 mg/kg <br /> Lead 50,500 mg/kg <br /> Formaldehyde Unknown <br /> Dichloromethane 6µg/kg <br /> Tetrachloroethylene (PCE) 27 /,tg/kg <br /> Trichloroethylene (TCE) 8 µg/kg <br /> Pentachlorophenol (PCP) Unknown <br /> Tetrachloro henol (TCP) Unknown <br /> The primary hazards of each are identified as follows: <br /> • Hydrocarbon fuels - Components of fuels are colorless liq ids with strong aromatic <br /> Advanced GeoEnvironmental,Inc. <br />