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Site Safety and Health Plan Stockton Field Maintenance Shop #24 8020 Air. ort VVa , Stockton, CA 4.0 HAZARD IDENTIFICATION AND ANALYSIS 4.1 EXPOSURE SUMMARY A summary of the major chemical contaminants at the site and their corresponding exposure limits and hazard summaries are provided as Table 4-1. The exposure limits given in the tables were obtained from 8 CCR 5155. Immediately dangerous to life and health (IDLH) values were obtained from the National Institute for Occupational Safety and Health (NIOSH) Pocket Guide to Chemical Hazards (February 2004) and the Threshold Limit Values (TLVs) as published by the American Conference of Governmental Industrial Hygienists (ACGIH), 2006 edition. Blanks in the table for certain compounds indicate that there are no established exposure limits reported for those compounds. The five exposure guideline terms used in the table are described below. Time-Weighted Average (TWA) Permissible Exposure Limit (PEL): Eight-hour Time Weighted Averages, Permissible Exposure Limit. An employee's exposure to any substance in the above tables (under TWA PEL), shall not exceed the 8-hour TWA given for that substance in any 8-hour work shift of a 40-hour work week. Ceiling Values: An employee's exposure to any substance in the above tables (under ceiling) shall, at no time, exceed the level given for that substance. Short-Term Exposure Limits (STEL): The STEL is a concentration a person may be exposed to over a short period of time, expressed as a 15-minute average. IDLH: Immediately Dangerous to Life and Health. Any condition that may result in damage to one's health, which cannot be repaired. IDLH situations include explosive and oxygen-deficient environments and the presence of Class A poisons or substances which can be absorbed through the skin. TLV: Threshold Limit Value as published by ACGIH. Star Resources Corp. 12