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Proiect Number 2098RV45 November 30 2017 Risk Assessment Summary: Exposure to chemicals anticipated on site includes solvents such as tetrachloroethene (PCE). Pathways of exposure for these contaminants for field personnel include dermal contact with contaminated soil, or inhalation of contaminated vapors. Use of personal protective equipment (PPE) planned for this project and following decontamination procedures of the SSP can mitigate dermal contact. Inhalation hazards can be reduced through the use of dust control measures, if warranted, and by observing action levels described in the SSP. During any operation with personnel inside the building, shop ventilation fans at the entrance or exit will be available to help expedite air exchange of the indoor air. Exposure to chemicals anticipated on site are Tetrachloroethene (PCE). Tetrachloroethene (PCE) Tetrachloroethene (PCE) is a manufactured chemical that is widely used for dry cleaning of fabrics and for metal degreasing. It is also used to make other chemicals and is used in some consumer products. It is a nonflammable liquid at room temperature. PCE evaporates easily into the air and has a sharp, sweet odor. Most people can smell PCE when it is present in the air at a level of 1 ppm, although some can smell it at even lower levels. High concentrations of PCE (particularly in closed, poorly ventilated areas) can cause dizziness, headache, sleepiness, confusion, nausea, difficulty in speaking and walking, unconsciousness, and death. Irritation may result from repeated or extended skin contact with it. Results of animal studies, conducted with amounts much higher than those that most people are exposed to, show that PCE can cause liver and kidney damage. The chemical is known to the State of California to cause cancer. • The OSHA PEL is listed as 100 ppm. • The Cal/OSHA PEL is listed as 25 ppm. • The TLV is listed as 25 ppm. • The IDLH is listed as 500 ppm. Possible Exposure to other chemicals anticipated inside the site building include: Carbon Monoxide. Carbon Monoxide (CO) Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is slightly less dense than air. It can cause fatal poisoning. • The OSHA PEL is listed as 50 ppm. • The Cal/OSHA PEL is listed as 25 ppm. • The TLV is listed as 25 ppm. • The IDLH is listed as 1,200 ppm. E2C Remediation B-3