SIP Proposal: Pennsylvania (requirements for reasonably available control technology controls for certain sources of volatile organic compounds under the 1997 ozone NAAQS).

SIP Approval: Wisconsin (site-specific sulfur dioxide requirements for USG Interiors LLC facility located in Walworth, Wisconsin).

SIP Approval: Wisconsin (site-specific sulfur dioxide requirements for USG Interiors LLC facility located in Walworth, Wisconsin).

SIP Approval: Wisconsin (site-specific sulfur dioxide requirements for USG Interiors LLC facility located in Walworth, Wisconsin).

SIP Proposal: Wisconsin (site-specific sulfur dioxide requirements for USG Interiors LLC facility located in Walworth, Wisconsin).

SIP Proposal: Wisconsin (site-specific sulfur dioxide requirements for USG Interiors LLC facility located in Walworth, Wisconsin).

SIP Proposal: Wisconsin (site-specific sulfur dioxide requirements for USG Interiors LLC facility located in Walworth, Wisconsin).

United States v. XIK, LLC, No. 017-cv-02368 (June 29, 2017). Settling CERCLA defendants responsible for industrial discharges of polycyclic aromatic hydrocarbons at the St. Louis River/Interlake/Duluth Tar Superfund site must pay $8,200,000 in civil penalties.

United States v. XIK, LLC, No. 017-cv-02368 (June 29, 2017). Settling CERCLA defendants responsible for industrial discharges of polycyclic aromatic hydrocarbons at the St. Louis River/Interlake/Duluth Tar Superfund site must pay $8,200,000 in civil penalties.

United States v. XIK, LLC, No. 017-cv-02368 (June 29, 2017). Settling CERCLA defendants responsible for industrial discharges of polycyclic aromatic hydrocarbons at the St. Louis River/Interlake/Duluth Tar Superfund site must pay $8,200,000 in civil penalties.