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These compounds are listed as Hazardous Substances by CAL/OSHA (California <br /> Code of Regulations, Title S, Section 339) Exposure Levels vary from l ppm (benzene) to 100 <br /> ppm (toluene) The airborne concentration of these compounds can be estimated by use of a <br /> photoionization detector (PID) The response of a photoiontzation detector used for real-time <br /> assessment of field conditions is relative (e g , it responds to some organics more accurately than <br /> others) Chlorinated hydrocarbons, for example, produce a response somewhat lower than their <br /> non-chlorinated analogues This phenomenon will be taken into account when field <br /> measurements are made <br /> Dermal effects of the chemicals of concern include drying or minor irritation of <br /> the skin Some are absorbed through intact skin Overexposure can result via this route through <br /> high concentration or long exposure period Protective gloves and clothing will be worn <br /> whenever dermal contact with potentially contaminated soil or water is possible Personal <br /> hygiene requirements include washing of the hands and face as soon as possible after soil and <br /> groundwater sample collection or contact with potentially contaminated media Whole body <br /> showers should also be taken as a precaution as soon as possible after leaving the site <br /> Chemical hazards may include low to moderate inhalation and dermal exposure <br /> Such risks, if encountered, can be mitigated by donning proper PPE These exposure control <br /> measures are further discussed in Sections 6 0 and 7 0 <br /> I <br /> 4.2 Physical Hazards <br /> Field personnel may be exposed to a number of physical hazards during this <br /> project, including <br /> • Noise, <br /> • Climbing hazards, <br /> • Heat stress, <br /> • Lacerations and contusions, <br /> • Mechanical hazards, <br /> 4-2 <br />