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r Site Safety and Health Plan 1 rerr�con ±18.41 Acres Vacant Land ■ Manteca, California June 12, 2017 ■ Terracon Project No. NB177049 Toluene is an eye, skin and mucous membrane irritant and a central nervous system depressant. Poisoning may affect the liver and kidneys. Prolonged exposure may affect the heart and blood. The ingestion of alcoholic beverages may enhance the toxic effects of toluene. Symptoms of exposure include respiratory tract irritation, headache, dizziness and eye irritation. Toluene may be absorbed to the bloodstream via skin contact. ETHYL BENZENE Permissible Exposure Limit 20 ppm ACGIH TLV Ethyl benzene is a skin, eye and mucous membrane irritant. It is moderately toxic by ingestion and slightly toxic by skin absorption. Ethyl benzene is a central nervous system depressant. Poisoning may affect the liver. Symptoms of exposure may include a sense of chest constriction and nervous disorders. Skin contact may result in first and second degree burns. The odor can be detected at 140 ppm and irritation occurs at —200 ppm. XYLENE Permissible Exposure Limit 100 ppm OSHA PEL Xylene is a mild eye and mucous membrane irritant, primary skin irritant and a central nervous system depressant. Ingestion causes severe gastrointestinal upset and creates an aspiration hazard. Chronic inhalation results in symptoms that resemble acute poisoning, but are more severe systemically. 7.2 Drilling Safety Precautions Project activities will consist of drilling soil borings to a total depth of 30 feet utilizing a DPT drill rig. Soil borings will be converted to temporary groundwater sampling wells. Soil and groundwater sampling activities will be conducted to evaluate the presence/absence of total petroleum hydrocarbons and volatile organic compounds in the onsite soil and/or groundwater beneath the site. Soil and groundwater samples will be collected and submitted to an independent analytical Iaboratory. The personal protective equipment and direct-reading air monitoring requirements specified below are designed to prevent personnel exposure to contamination in excess of permissible exposure limits. Personnel must remain aware of the potential for fire if soils saturated with flammable liquids, such as gasoline, are encountered. 7.3 Site Physical Hazards/Precautions The physical hazards associated with intrusive site activities can include inclement weather, material handling, slips/falls etc. Some anticipated hazards and means for preventing injury from those hazards are as follows: 8