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CHEMICAL HAZARDS <br /> All of the chemical hazards outlined in this table pertain to diesel in UST and its release to soil at the UST location in the <br /> Tracy Auxiliary Field No. 5, Tracy, California. The expected low vapor pressure and low concentrations in soil would • <br /> indicate that the route of entry into the body is limited to inhalation of high levels of airborne soil dust and inhalation of <br /> contaminated vapor during the pumping of tank contents and rinsate. The ingestion route of entry is limited to hand-to- <br /> mouth activities (i.e. eating, drinking, smoking) if the worker does not wash the exposed skin before these activities are <br /> performed. Contaminated soil may be found throughout the exclusions zones under excavated UST or piping. <br /> Inhalation of contaminated dust is not expected to be a hazard due to the use of water spraying during excavation and <br /> loading. Theoretically, the total airborne dust concentration during extremely dusty conditions can be conservatively <br /> estimated to be 100 mg/m3. The highest average concentration of diesel in soil is conservatively estimated to be 500 <br /> mg/kg. Based upon this worst case assumption, the highest airborne levels of petroleum hydrocarbons that could be <br /> expected would be 0.05 mg/m3. This is well below the Cal-OSHA PEL of 890 mg/m3 for gasoline. The concentration of <br /> petroleum hydrocarbons in tank contents and rinsate that is found may be high enough that it would be considered <br /> prudent to wear Level C protection during all pumping of UST and rinsate activities. <br /> EQUIPMENT OSHA ACGIH ION. <br /> CHEMICAL CONC. PEL TLV POTENTIAL CHARACTERISTICS TOXICOLOGY <br /> Diesel Assumed to be 890 890 Not listed mol. wt. - N/A Affects nervous system, liver, and <br /> high in UST mg/m3 mg/m3 boil. pt - >120°F kidneys; high levels cause <br /> and low in soil gasoline gasoline vapor press - 20 mmHg dizziness, weakness or vomiting <br /> LEL - 2000 ppm <br />