COMPLIANCE INFO_1986-1997 - Laserfiche WebLink

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1800 N. California Street (209) 943-2000 All contractors are responsible for their own corporate health and safety program and the health and safety of their own employees. The health and safety procedures for this project are specified by this SSHP which all contractors on site will follow. The hazard analysis identifies potential hazards that pertain to specific on-site activities. These activities include: gasoline tank removal and replacement, chemical contamination, and construction and operation of the soil vapor extraction and treatment system. Tank Removal/Excavation The potential hazards to personnel working at the subject have been identified as chemical contamination, physical hazards of working around heavy equipment, a large excavation, methane gas, and heat stress (potential for cold stress due to seasonal changes). Each potential hazard relative to the potential for exposure is described below. Chemical Contamination The Chemical contaminants of concern for this project are gasoline constituents [benzene, ethyl benzene, touene, and xylene (BETX)], and chemical characteristics and exposure level information for these compounds are presented in Table C-1. The hazards associated with these chemicals are potential for fire and explosion, and potential worker exposure due to direct contact and/or inhalation of vapors of gasoline constituents. These potential hazards will be controlled through monitoring and the use of protective equipment as described later in this SSHP. Gasoline vapors (50 to 100 octane) are moderately to highly toxic via inhalation, which can cause central nervous system depression, pneumonitis, fatal pulmonary edema, and some addiction if exposures too the vapors are greater than 300 parts per million(ppm). Gasoline also poses fire and explosion hazards when present in sufficient concentrations and with a source of ignition. The flammable range for gasoline vapors is 1.3 to 6.0 percent by volume in air. During the excavation, gasoline will potentially accumulate in the hole. The presence of methane gas due to migration through the soil from an unidentified source poses the potential for extreme fire and explosion hazard. Methane gas will be released to the atmosphere during excavation, and if present in concentrations within the flammable range with a source of ignition, a fire and explosion would result. The flammable range for methane gas is 5.5 to 14.0 percent by volume in air. Soil Vapor Extraction System The potential hazard to personnel installing the probes, vapor monitoring wells, and piping will be minimal. The probes will be pushed into the soil to a depth of 5-1/2 feet. There will be no excavations or removal of contaminated soils. Only the surface of the soil will be exposed so there won't be any exposure to contamination.