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RISK ASSESSMENT SUMMARY: <br /> Exposure to chemicals anticipated on-site include volatile aromatics such as benzene, toluene, <br /> xylene, and ethyl benzene. These chemicals represent a hazard because they are moderately <br /> to extremely toxic and highly flammable. Threshold. Limit Values (LTV's), .Short Term <br /> Exposure Limits (STEL's), and Toxicity Levels (LD 50, oral-rat), allin in mk/kg (ppm) are <br /> listed below: <br /> Compound TLV STEL Toxicity <br /> Benzene 10 25 4894 <br /> Toluene 100 150 5000 <br /> Xylene 100 - 150 4300 <br /> Ethyl Benzene 100 150 4300 <br /> Benzene is considered an extreme cancer hazard. Applicable MSDS forms are attached. <br /> EXPOSURE MONITORING PLAN: <br /> A Photo-Ionization Detector (PID) will be used to monitor vapor concentrations around the <br /> site. Should concentrations exceed TLV's, protective measures will be taken. Passive <br /> dosimeter, badges will be placed in downwind locations if PID readings indicate high levels <br /> of volatile organics in the breathing space. <br /> PERSONAL PROTECTIVE EQUIPMENT: <br /> All personnel on-site will have access to respirators with organic vapor cartridges. <br /> Replacement cartridges will be available on-site as needed. When handling samples, the on- <br /> site geologist will wear latex gloves. Hard hats will be worn by all personnel on-site when <br /> in proximity of excavation equipment. <br /> WORK ZONES AND SECURITY MEASURES: <br /> i <br /> Access to the site will be restricted to authorized personnel. A set of cones, placards, or <br /> wide yellow tape, surrounding the site will define the perimeter. The Project Manager will <br /> be responsible for site security. <br /> DECONTAMINATION MEASURES: <br /> Avoidance of contamination whenever possible is the best method for protection. Common <br /> sense dictates that on-site personnel avoid sitting, leaning, or. placing equipment on.possibly j <br /> contaminated soil. <br /> All personnel will be advised to wash their hands, neck, and face with soap and water <br /> before taking a break or leaving the site. Respirators will be washed -with soap and water <br /> . <br /> following Y <br /> each day's use. <br /> Sampling equipment used will be decontaminated by steam-cleaning., Sampling equipment <br /> will be decontaminated before each sample is taken. <br /> GENERAL SAFE WORK PRACTICES: <br /> Personal safety and hygiene should be of utmost Consideration while on-site. To prevent , <br /> ingestion of contaminants no person shall be allowed to eat, drink, or smoke on the site., <br /> The Site Safety officer .will designate an appropriate nearby area. <br /> i <br /> i <br /> 1 <br />