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3.2 Health Analysis and Chemical Risk Assessment Chemicals may be purchased and transported to the Site to support Site characterization and remediation operations. The principal chemical contaminants at the Site are expected to be TPPH,Benzene,and MTBE. Appendix B contains information from the National Institute for Occupational Safety and Health (NIOSH)Pocket Guide to Chemical Hazards about each of these chemicals (Each person completing a HASP should go to www.cdc.jzov/niosh/npg/and print a current copy of the chemical information for the potential contaminants on-site and put into Appendix B). Additionally,the Hazard Communication Program(Policy No.21)requires ATC to provide employees,contractors, subcontractors,and visitors with information on the health effects of these chemicals and necessary actions to protect against exposure. This information is transmitted through Material Safety Data Sheets(MSDS),the NIOSH Pocket Guide, container labels,training, and a written Hazard Communication program. site activities will adhere to the ATC Hazard Communication Program as described in the Policy. All Site personnel, including subcontractors,will be briefed on this Program as part of the Site orientation training before starting work. In accordance with this Program,the PM and Site Supervisor will check that each chemical brought to the Site is accompanied by its MSDS. A copy of each MSDS will be made available to each Site employee who may be potentially exposed to the chemical. In addition,the Site Supervisor will check that all subcontractors bring at least one copy of MSDS for each chemical they bring onto the Site. The Site Supervisor will also check that all chemical containers brought to the Site to determine if they are labeled as to its contents and appropriate hazard warnings. 3.3 Risks Associated With Drilling and Subsurface Activities Drilling operations will conform to the Job Safety Analysis and Subsurface Investigation(ATC Policy No. 33). During drilling operations,the subsurface is penetrated to obtain soil and/or groundwater samples. Contaminated soil cuttings and groundwater may be brought to the surface,creating a potential for exposure through skin contact and inhalation of vapors. The open borehole also creates a conduit for vapors to be released to the atmosphere. However,the amount of vapors released to the atmosphere is relatively small and vapors are usually quickly diluted and dispersed in air. Air monitoring is required to determine if protective equipment is necessary, as described in Section 4.0 of this HASP. In addition to these chemical risks,the risk of drilling into a buried utility,such as a gas,water,electric line,or underground storage tank or other structures, is always present. Complete the Checklist for Subsurface Clearance prior to any subsurface work(see Appendix C)and follow the procedures in Table 3-1 for at least the first 5 feet of penetration: 20160613 Stockton,March Ln 2016 HASP 5-4 6/13/16)