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    2020-2-16  hydraulic systems, mining equipment Authorized use at < 50 ppm Natural gas pipelines Authorized at < 50 ppm, or at > 50 ppm with additional requirements. PCBs may be present in natural gas compressors, scrubbers, filters, and in condensate. Research Development Authorized primarily for purposes relating to environmental analysis,

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    Ingestion and inhalation are the most common routes of exposure to arsenic, and they are the routes that most commonly lead to illness. Dermal exposure may lead to illness, but to a lesser extent than ingestion or inhalation routes of exposure. The exposure dose is the cumulative exposure from all routes. Dermal exposure may lead to illness, but to a lesser extent than ingestion or inhalation ...

  • Vol. 35 Iss. 12 (Final Regulation) 9VAC20-81, Solid

    "Benchmark" means a permanent monument constructed of concrete and set in the ground surface below the frostline with identifying information clearly affixed to it. Identifying information will include the designation of the benchmark as well as the elevation and coordinates on the local or Virginia state grid system. ... "Landfill mining ...