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  2. 3M contamination of Minnesota groundwater - Wikipedia

    en.wikipedia.org/wiki/3M_Contamination_of...

    Since then, 3M has continued to use PFAs in a variety of products, with Scotchgard being the most well known and commercially lucrative. [4] Until the early 2000s, waste from the production of PFAs was dumped at four sites in Minnesota, the Washington County Landfill, the 3M Cottage Grove Chemolite Site, the 3M Woodbury site, and the 3M Oakdale ...

  3. Groundbed - Wikipedia

    en.wikipedia.org/wiki/Groundbed

    The electrodes for electrical grounding are often called ground rods and are often made from steel with a copper clad surface – typically 1 to 2 m long and 20 millimetres (0.79 in) in diameter. These are driven vertically into the ground and bonded together with bare copper wire. [1]

  4. Spent fuel pool - Wikipedia

    en.wikipedia.org/wiki/Spent_fuel_pool

    Water quality is tightly controlled to prevent the fuel or its cladding from degrading. This can include monitoring the water for contamination by actinides, which could indicate a leaking fuel rod. [7] Current regulations in the United States permit re-arranging of the spent rods so that maximum efficiency of storage can be achieved. [5]

  5. Earthing system - Wikipedia

    en.wikipedia.org/wiki/Earthing_system

    While the national wiring regulations for buildings of many countries follow the IEC 60364 terminology, in North America (United States and Canada), the term "equipment grounding conductor" refers to equipment grounds and ground wires on branch circuits, and "grounding electrode conductor" is used for conductors bonding an earth/ground rod ...

  6. Oil well control - Wikipedia

    en.wikipedia.org/wiki/Oil_well_control

    Oil well control is the management of the dangerous effects caused by the unexpected release of formation fluid, such as natural gas and/or crude oil, upon surface equipment of oil or gas drilling rigs and escaping into the atmosphere.

  7. Christmas tree (oil well) - Wikipedia

    en.wikipedia.org/wiki/Christmas_tree_(oil_well)

    Oil well Christmas tree. In petroleum and natural gas extraction, a Christmas tree, or tree, is an assembly of valves, casing spools, and fittings used to regulate the flow of pipes in an oil well, gas well, water injection well, water disposal well, gas injection well, condensate well, and other types of well.

  8. “History Cool Kids”: 91 Interesting Pictures From The Past

    www.aol.com/lifestyle/history-cool-kids-91...

    Image credits: historycoolkids The History Cool Kids Instagram account has amassed an impressive 1.5 million followers since its creation in 2016. But the page’s success will come as no surprise ...

  9. Underground storage tank - Wikipedia

    en.wikipedia.org/wiki/Underground_storage_tank

    Many thousands of old underground tanks were replaced with newer tanks made of corrosion resistant materials (such as fiberglass, steel clad with a thick FRP shell, and well-coated steel with galvanic anodes) and others constructed as double walled tanks to form an interstice between two tank walls (a tank within a tank) which allowed for the ...

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