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.., <br /> i <br /> 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,t(oral-rat), all in mk/kg (ppm) are <br /> listed below: ! <br /> i <br /> Compound TLV STEL fi Toxicity <br /> Benzene 10 25 4894 <br /> Toluene 100 150 # 5000 <br /> Xylene 100 150 i4 4300 <br /> Ethyl Benzene 100 150F 4300 <br /> Benzene is considered an extreme cancer hazard. ` Applicable MSDS forms are attached. <br /> l�EXPOSURE MONITORING PLAN: it <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. 1 <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 /> 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. f} <br /> DECONTAMINATION MEASURES: f <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 <br /> contaminated soil. j <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 /> following each day's use. s <br /> v; <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: 3? <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 ne`.'arby .area. <br /> t <br />