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57 <br /> s <br /> PES Environmental, Inc. <br /> Geweke Property <br /> April 30, 1991 <br /> Page A <br /> Benzene LELA EL = 1.3/7.1 percent <br /> TLV(TWA)/IDLH = 1012,000 ppm (Potential carcinogen) <br /> Hazard Properties = ignitable, toxic,volatile <br /> Exposure Routes = inhalation, skin absorption, and ingestion <br /> Toluene LELAJEL = 1.3/7.1 percent <br /> TLV(TWA)/IDLH = 100/2,000 ppm <br /> Hazard Properties = ignitable, toxic,volatile <br /> Exposure Routes = inhalation,skin absorption, and ingestion <br /> Xylenes LEL/UEL = 1.0/7.0 percent <br /> 'I`L,V(TWA)/IDLH = 100/10,000 ppm <br /> Hazard Properties = ignitable, toxic,volatile <br /> Exposure Routes = inhalation,skirl absorption, and ingestion <br /> Dn-site physical hazards include working around heavy equipment and traffic. <br /> j Mechanical hazards will exist related to operating the drill rig, if utilized; <br /> • Traffic, if working on the street; <br /> • Tripping or falling hazards may exist at the site; and, <br /> • Noise hazards may exist from operating or working near heavy equipment. <br /> yL,,.k,,ZARD MMGATIQN <br /> Chemical IFInrards <br /> The chemical hazards listed above will be mitigated by a combination of on-site air <br /> monitoring and having on-site personnel wear the appropriate personnel protective <br /> equipment. Air monitoring will be performed using a portable organic vapor analyzer <br /> (HNU). Initial MNU readings will be made prior to sampling in order to establish <br /> background concentrations. Subsequent to establishing background levels,s,1npiing or <br /> drilling operations will commence and the following level of protection will be adhered <br /> to: <br /> Level I) used when concentrations above background are less than ten parts per <br /> million (ppm): <br /> • Respiratory Protection - not required. <br /> • Dermal Protection - normal work clothes and disposable gloves. <br /> 3GpGEOIBHOLW51 <br /> .�+ms�R1eG]IrS7�71� <br />