 First brought online in the mid-1950s, the Encanto Gas Holder was decommissioned in 2000-2001 by San Diego Gas and Electric, Sempra Energy as the agent of SDG&E, and the IT Corporation as the main contractor for the decommissioning.TriState was brought on board to abate strips of asbestos-containing pipe coating for another contractor to cut the holder bottle into sections.TriState was later tasked with stripping the coating at the gas holder site despite employee and nearby residents' concerns over friable asbestos generated as a byproduct of the gross stripping processes employed by SDG&E contractors.