Section 55.3 - Applicability(a) This part applies to all OCS sources except those located in the Gulf of Mexico west of 87.5 degrees longitude.(b) OCS sources located within 25 miles of States' seaward boundaries shall be subject to all the requirements of this part, which include, but are not limited to, the Federal requirements as set forth in § 55.13 of this part and the Federal, State, and local requirements of the COA (designated pursuant to § 55.5 of this part), as set forth in § 55.14 of this part.(c) The OCS sources located beyond 25 miles of States' seaward boundaries shall be subject to all the requirements of this part, except the requirements of §§ 55.4 , 55.5 , 55.12 and 55.14 of this part.(d) New OCS sources shall comply with the requirements of this part by September 4, 1992 where a "new OCS source" means an OCS source that is a new source within the meaning of section 111(a) of the Act.(e) Existing sources shall comply with the requirements of this part by September 4, 1994, where an "existing OCS source" means any source that is not a new source within the meaning of section 111(a) of the Act.57 FR 40806, Sept. 4, 1992, as amended at 62 FR 46408, Sept. 2, 1997