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3.2 Chemical Hazard The chemicals of primary concern include Petroleum Hydrocarbons. Exposure to the compounds listed above may occur through skin absorption, skin contact irritation, possible ingestion and inhalation of volatiles. ' Exposure symptoms are potentially extremely variable due to the variety of compounds ' present. Symptoms may include nausea, headache, abdominal pain, twitching, weakness, slurred speech and vomiting. It is expected that dust control measures, personal protective equipment and employee work practices will adequately control potential ' exposures to the materials present at the site. ' 4.0 PERSONAL PROTECTIVE EQUIPMENT AND ZONE DELINEATION ' 4.1 Levels of Protection Site activities are expected to be conducted using modified Level D personal protective ' equipment (PPE). Upgrading or downgrading the level of protection will be based on real time working conditions. Changes in the level of protection will be the responsibility of the HSO in consultation with the FS. ' 4.2 Respiratory Protection ' If air purifying cartridge respirators are necessary an appropriate cartridge for use with the known hazardous materials and corresponding concentrations will be selected by the ' HSO. Change over frequency will be based on containment concentrations, exposure duration, breathing resistance, odor breakthrough, if any, and the chemical warning properties. A cartridge will not be used for more than eight hours. The decision for using respiratory protection will be made by the HSO and based on the action levels provided in Table 5-3. Types of respiratory protection equipment and the level of protection are provided in Table 4-2. 4.3 Care and Cleaning of Personal Protection Equipment Provisions for the care and cleaning of personal protective equipment (respiratory protection) are found in the KROEKER Respiratory Protection Program included as Attachment F. Responsibility for compliance with these provisions are with the FS. 1 10