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77 FR 21702

SIP Proposal: Idaho (infrastructure and PSD requirements and rescission of federal implementation plan).

77 FR 21690

SIP Proposal: Arizona (attainment of the 1997 eight-hour ozone NAAQS for the Phoenix-Mesa nonattainment area).

77 FR 21663

SIP Approval: Kentucky (attainment of the 1997 fine particulate matter NAAQS for the Huntington-Ashland nonattainment area).

77 FR 21453

SIP Approval: Colorado (new source review rules ).

77 FR 20848

United States v. Coltec Industries, Inc., No. 1:10-cv-01659-ABJ (D.C. Mar. 28, 2012). Settling CAA defendants that violated certificate of conformity requirements in their engine and marine vessel manufacturing operations must pay a $280,000 civil penalty, must perform a supplemental environmental project at an estimated cost of $500,000, and must comply with labeling requirements.

77 FR 20948

FWS determined endangered status for the Miami blue butterfly under the ESA and threatened status for the cassius blue butterfly, the ceraunus blue butterfly, and the nickerbean blue butterfly due to their similarity of appearance to the Miami blue butterfly. 77 FR 20948 (4/6/12).

77 FR 20894

SIP Approval: North Dakota (partial approval of regional haze program and promulgation of a federal implementation plan).

77 FR 20590

EPA proposed to designate two new ocean dredged material disposal sites offshore of Yaquina Bay, Oregon, pursuant to the Marine Protection, Research, and Sanctuaries Act.

77 FR 20585

EPA proposed to withdraw federal human health and aquatic life water quality criteria in favor of state criteria for certain waters of California's San Francisco Bay, New Jersey, and Puerto Rico. 

77 FR 20575

SIP Proposal: Wisconsin (designation of the Forest County Potawatomi Community as a Class I Area).