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Health and Safety Plan 453 Moffat Blvd Manteca, California 3.0 HAZARDS Hazards that could be encountered include chemical hazards, environmental hazards, biological hazards, and/or physical hazards. The sub-categories of these four types of hazards are explained in further detail below. 3.1 Chemical Hazards Chemical hazards may be encountered during the field activities to be conducted at the Site. These hazards may be encountered through inhalation, absorption, or ingestion. Based on historical site usage and the site usage and that of neighboring sites, soil, groundwater, and soil gas impacted with heavy metals including lead and arsenic, OCPs, (TPHg), diesel (TPHd), and motor oil (TPHmo), and volatile organic compounds (VOCs) may be encountered during intrusive activities, including soil sampling, excavation, and drilling activities. 3.1.1 Absorption and Ingestion Risk In general, the anticipated concentrations of the above-mentioned chemicals of potential concern (COPCs) in soil and groundwater are such that the absorption and ingestion risk can be minimized by proper personal hygiene and use of personal protective equipment (PPE). The PPE requirements are discussed further in Section 8.0. If work is anticipated in areas where one or more of the COPCs exceed acceptable risk-based screening levels; the work practices, engineering controls, and required PPE will be assessed and modified as necessary in an addendum to this HASP. 3.1.2 Inhalation Risk 3.1.21 Metals The inhalation risk associated with metals impacts is unlikely during the boring and sampling activities because the sampling methods should generate minimal dust. The inhalation risk is greater during excavations activities at the Site. Dust monitoring or air monitoring for specific metals may be necessary during excavation activities. The need for air monitoring for dust or metals will be assessed prior to excavations at the Site. Action levels will be developed as necessary based on soil analytical data in the proposed excavation areas. 3.1.22 Total Petroleum Hydrocarbons and Volatile Organic Compounds Inhalation risk associated with TPH and VOCs is possible when disturbing the subsurface (e.g., soil borings). During the periods of field activities when the subsurface is disturbed, real-time air monitoring of the worker breathing zone will be conducted. Air monitoring is discussed further in section 9.0. If field personnel experience short-term health effects such as headaches, nausea, or eye and respiratory irritation that are often associated with VOCs, he or she will take a break to relieve symptoms and further assess the risk to other personnel in the immediate area. Terraphase Engineering Inc.