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Manteca,CA Health&Safety Plan BB&1 Project No.R1005160 Apri130,2010 , Log No.10-700-02 TABLE 1: List of Constituents of Concern and Exposure Limits NOTES: 1 Known or suspected constituents of concern 2. Exposure limits and ionization potential were obtained from the NIOSH Pocket Guide to Chemical Hazards dated September 2007. Please refer to specific material safety data sheets for additional exposure and first aid information. 3. Exposure limits are listed in ppm,unless noted 4. Based on a 10-minute peak(time-welghted average) 5 Exposure limits are the same for all Isomers—ortho,meta and para • 6' Ionization potential for ortho+meta/para Isomers 7• Based on a 60-minute peak(time-weighted average) 6: Based on a 15-minute peak(time-weighted average) ACRONYMS: NIOSH: National Institute for Occupational Safety and Health OSHA: Occupational Safety and Health Administration Permissible Exposure Limit CA: Considered to be a potential occupational carcinogen by NIOSH COC: Constituent of Concern REL: NIOSH Recommended Exposure Limit.Based on time-weighted average(TWA)concentrations for up to a 10-hour workday during a 40-hour workweek. ST: Short Term Exposure Limit. Measured over a 15-minute TWA exposure that should not be exceeded at anytime during a workday. C: Calling for Exposure Limit. Should not be exceeded at any time. PEL: OSHA Permissible Exposure Limit. Based on time-weighted average(TWA)concentrations for up to an 8-hour workshift during a 40-hour workweek. IP: Ionization Potential IDLH: Immediately Dangerous to Life or Health concentrations,as determined by NIOSH • NP: None published ppm: Parts per million(Referencing benzene,1 ppm=3.19 mg/m3—each COC has different result In mg/m) mg/ms' Milligrams per meter cubed eV: Electron volts Prepared By/Date: Gd/04.30.10 Checked By/Date: /04.XX.10 Notes and Acronyms are at the end of the table. Page 8 of 8