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Project No.4-419-0381 August 29,2019 Page No.9 • If total organic vapors exceed 1,400 ppm or 10% LEL in the atmosphere of the work zone (see Chapter V for monitoring procedures),the field team personnel will be instructed to stop work and move upwind,and methods will be implemented to subdue potentially combustible vapor emissions (such as sprinkling spoils with water). 3.3.4 Chemical Hazards Field activities anticipated at the site may present potential chemical hazards.Actual exposure to chemicals is dependent on the specific work task, location, weather conditions, personal work habits, and personal protective equipment being used.Overviews of the hazards associated with exposure to the chemicals found on-site to date, are presented below. The following chemical hazards may be encountered at the worksite: • Hazardous organic volatile chemicals, which may adversely affect human health through skin contact and inhalation. The following procedures will be implemented to minimize potential harm from hazardous organic chemicals: • The responses listed in Table 3 to organic vapors will be instituted at the work site(see Chapter V for monitoring procedures); and • The SALEM field team member will refer to the NIOSH/OSHA Pocket Guide to Chemical Hazards for the proper response to hazardous organic chemicals if field team personnel complain of irritation, giddiness,headache, or nausea. The following procedures will be implemented to minimize potential harm from acidic or caustic substances: • The field team members will be instructed to stop work and leave the work zone if there are indications of the presence of acidic or alkaline substances (eye, nose, throat, or skin irritation; holes in clothes); • The field team member complaining of these symptoms will be instructed to immediately flush the area of the body exhibiting the symptoms with cool or cold water; • The SALEM field team member(s)will determine the pH of the apparently offending substance; • If the pH is less than 2 or greater than 12 standard units,the field team personnel will be required to wear Tyvek coveralls, chemically resistant gloves, chemically resistant boots, splash goggles, and half mask respirators with acid and particulate cartridges; and • Field team members are instructed to minimize contact with the acidic or caustic substance. PEL—Permissible Exposure Limit TLV—Threshold Limit Value TLV—STEL—Short Term Exposure Limit IDLH—Immediately Dangerous to Life and Health. Permissible Exposure Limits (PEL's) and Threshold Limit Values are defined as time weighted average (TWA) concentrations for an 8-hour work day, 40 hour work week to which almost all workers can be repeatedly exposed to without suffering adverse health effects. If work shifts are greater than 8 hours, the PEL should be reduced by 400 divided by the number of hours worked in the day. The work hours will be determined prior to the commencement of on-site activities. Ll SALEM engineering group. inc.