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1.0 - INTRODUCTION 1.1 Scope and Applicability of the Site Health and Safety Plan This Health and Safety Plan (HASP) has been prepared by ATC Associates, Inc. (ATC) for the activities associated with the vapor study and sampling, identification, and possible removal of hazardous materials at Entenmann's facility, in Sacramento, California. The health and safety protocols established in this Plan are based on the ATC Employee Health and Safety Policy Manual, the Occupational Safety and Health Administration (OSHA) Regulations, past field experiences, specific Site conditions, and chemical hazards known or anticipated to be present from available Site data. The following Site Health and Safety Plan (HASP) is intended solely for use during the proposed activities described in the project documents and technical specifications. Specifications herein are subject to review and revision based on actual conditions encountered in the field during Site characterization activities. Such changes may be instituted by using the HASP List of Approved Amendments and/or Changes (see Appendix C). Before Site operations begin, all employees, including subcontractors for ATC covered by this plan, involved in these operations will have read and understood this HASP and all revisions. All Site personnel have the authority to "Stop Work" if unsafe conditions are present or discovered during Site activities. Before work begins, all affected workers will sign the Heath and Safety Plan Acknowledgment Form (see Appendix C). By signing this form, all individuals recognize the requirements of the HASP, known or suspected hazards, and will adhere to the protocols required for the project Site. 1.2 Historical Overview On October 6, 1987, Al Williamson, General Contractor, removed two 1,000-gallon leaded gasoline tanks and one 550-gallon waste oil tank from the locations shown on Figure 2. Soil samples collected after the tank removals contained elevated concentrations of petroleum hydrocarbons and volatile organic compounds (VOCs). On January 21, 1988, Falcon Energy, attempted to remove all VOC contaminated soil by over- excavating the former tank locations. The former tank locations were excavated to approximately 22 feet below ground surface (bgs). The excavation was limited to the north by the on-site building. The confirmation samples collected from the base of the over-excavation still contained elevated concentrations of volatile organics. The over-excavated soil was disposed of at Forward Landfill near Stockton, California. On June 30 and July 1, 1997, Smith Technology personnel supervised advancement of seven soil borings, SB1 through SB7, at the site to depths ranging from approximately 40 to 45 feet bgs to investigate the horizontal and vertical extent of petroleum hydrocarbon soil and groundwater contamination. Three of the soil borings were completed as groundwater monitoring wells and two of the soil borings were completed as vapor extraction wells. On July 3, 1997, the monitoring wells were developed and sampled for petroleum hydrocarbons along with the adjacent property owner's well (CW). The samples from MW1, MW2, and MW3 contained concentrations of total petroleum hydrocarbons as gasoline (TPHg) and benzene ranging from 3,200 micrograms per liter (ugh) to 130,000 ug/1 and 920 to 11,000 ugh, respectively. Field activities and analytical results were detailed HASP Level III Rev. 01 — June 11,2007 1-1