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Site Health and Safety Plan Page 10
<br />Symptoms of over exposure may include irritation to the eyes, skin, nose, respiratory system
<br />and throat. Symptoms of acute over exposure may include drowsiness, nausea, headache,
<br />urticaria and erythmea.
<br />The United States OSHA PEL Limit for tetrachloroethylene is 6,708 mg/m3 (100 ppm).
<br />Tetrachloroethylene is reasonably anticipated to be a human carcinogen based on sufficient
<br />evidence of carcinogenicity from studies in experimental animals3.
<br />3.3.9 Semi-Volatile Organic Compounds
<br />Semi-volatile organic compounds (SVOCs): SVOCs are a group of compounds that include
<br />pesticides, polychlorinated biphenyls, flame retardants, and polyaromatic hydrocarbons
<br />(PAHs). 1,2,4-trichlorobenzene and bis(2-ethylhexyl) phthalate (DEHP) are two SVOCs that
<br />have been identified in groundwater samples collected from the site. Other SVOCs detected
<br />include 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4- dichlorobenzene and di-n-
<br />butylphthalate. Many SVOCs are reasonably anticipated to be human carcinogens, while
<br />others (i.e., benzo(a)pyrene) are known human carcinogens.
<br />Occupational exposures occur primarily through inhalation and dermal contact. There are no
<br />PEL's established for SVOCs as a group. The REL established by the NIOSH for one, two
<br />1,2,4-trichlorobenzene is 40 mg/m3. The PEL for DEHP is 5 mg/m3. The PEL for 1, 2 and 1,
<br />3-dichlorobenzene is 300 mg/m3 and 450 mg/m3, respectively.
<br />3.3.10 Methane Gas
<br />CAS # 74-82-8
<br />Methane is an odorless gas and is lighter than air. Because methane is lighter than air, it
<br />tends to rise and accumulate near the higher, stagnant parts of enclosed buildings and
<br />tightly closed manure storage pits. It is most likely to accumulate during hot, humid weather.
<br />OSHA has no permissible exposure limit for methane, but NIOSH's maximum recommended
<br />safe methane concentration for workers during an 8-hour period is 1,000 ppm (0.1 percent).
<br />It is highly flammable and has a Lower Explosive Limit (LEL) of 5% (50,000 ppm).
<br />3.3.10.1 Polychlorinated Biphenyls
<br />Polychlorinated biphenyls (PCBs): PCBs are class of biphenyl compounds with 1 to 10
<br />hydrogen atoms replaced by chlorine. They range from light to dark yellow oily liquids to
<br />white crystalline solids and non- crystalline resins. Historic use of PCBs have been for
<br />transformers, capacitors and hydraulic fluid, and other applications for use in inks, flame
<br />retardants, adhesives, carbonless duplicating paper, paint, plasticizers, wire insulators,
<br />metal coatings and pesticide extenders.
<br />The primary route of human exposure to PCBs is through ingestion, inhalation, and dermal
<br />contact. PCBs are no longer produced, but measurable quantities of PCBs in air, water, soil
<br />are common throughout the world.
<br />The OSHA PEL for PCBs is 0.5 mg/m3 for compounds with 54% chlorine (e.g., Aroclor 1254);
<br />and 1.0 mg/m3 for compounds with 42% chlorine (e.g., Aroclor 1242).
<br />
<br />3 NTP (2016). 14th Report on Carcinogens. U. D. o. H. a. H. Services. Research Triangle Park, North Carolina, United States
<br />Department of Health and Human Services.
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