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All onsite employees will take reasonable precautions to <br /> avoid unforeseen hazards. After documenting full <br /> understanding of the SSP, each onsite employee will be <br /> responsible for strict adherence to all procedures <br /> described herein. Any deviation observed will be <br /> reported to the SSO and corrected. Onsite employees will <br /> be held responsible to perform only those tasks for which <br /> they believe they are qualified. <br /> Provisions of this SSP are mandatory and all personnel <br /> associated with onsite activities will adhere strictly <br /> hereto. <br /> 1. 3 Job Hazard Analysis <br /> Hazards likely to be encountered onsite include those <br /> commonly encountered when operating any mechanical <br /> equipment, such as the danger of falling objects or <br /> moving machinery. simple precautions will reduce or <br /> eliminate risks associated with operating such equipment. <br /> A qualified drilling contractor will be employed to <br /> deliver and operate all drilling equipment. Only <br /> qualified personnel will have any contact with this <br /> equipment. All onsite personnel, including the drilling <br /> contractor and his employees, will be required to wear <br /> hard hats when in close proximity to drilling equipment. <br /> Latex sampling gloves will be worn by persons collecting <br /> or handling samples, to prevent exposure to contaminants. <br /> Gloves will be changed between samples, and used ones <br /> discarded, to avoid cross-contamination. Proper <br /> respiratory equipment will be worn if vapor contamination <br /> levels onsite exceed action levels as determined using a <br /> Photo-Ionization Detector (PID) or Organic Vapor Analyzer <br /> (OVA) . Furthermore, no onsite smoking, open flame, or <br /> sparks will be permitted, to prevent accidental ignition <br /> of gasoline contamination. All personnel shall also <br /> adhere to the safety procedures and requirements of <br /> Caltrans. <br /> 5.3 ,1 Risk Assessment Summary <br /> Exposure to chemicals anticipated onsite as mayor <br /> contaminants, including benzene, toluene, and xylene <br /> (BTX) , ethylbenzene, gasoline fuel hydrocarbons, and <br /> tetraethyl lead, represents a hazard because they are <br /> moderately to extremely toxic and most are highly <br /> flammable. Threshold Limit Values (TLV's) , Short Term <br /> Exposure Limits (STEL's) , and Toxicity Levels (LD50, <br /> oral-rat) , all in mg/kg (ppm) , are listed below: <br />