Section 157.24a - Submission of calculations, plans, and specifications for existing vessels installing segregated ballast tanks(a) Before modifications are made to a U.S. tank vessel to meet § 157.10a(a)(1) , § 157.10a(c)(1) , § 157.10c(b)(1) , or § 157.10c(c)(1) , the vessel's owner or operator must submit the following to the Officer in Charge, Marine Inspection, of the zone where the modification will be made or to the appropriate Coast Guard technical office listed in 157.100(b): (1) A drawing or diagram of the pumping and piping system for the segregated ballast tanks.(2) A drawing of the segregated ballast tank arrangement.(3) Documentation, calculations, or revised stability information to show that the vessel, with the addition of the segregated ballast tanks, meets the stability standards for load line assignment in 46 CFR Part 42.(4) Documentation, calculations, or a revised loading manual to show that the vessel, with the addition of the segregated ballast tanks, meets the structural standards in 46 CFR Part 32.(5) Plans and calculations to show that the vessel, as modified, complies with the segregated ballast capacity and distribution requirements in § 157.10a .(b) Before each foreign vessel under § 157.10a(a)(1) or § 157.10a(c)(1) enters the navigable waters of the United States, the owner or operator of that vessel must- (1) Submit to the Commandant (CG-CVC), Attn: Office of Commercial Vessel Compliance, U.S. Coast Guard Stop 7501, 2703 Martin Luther King Jr. Avenue SE., Washington, DC 20593-7501- (i) A letter from the authority that assigns the load line to the vessel finding that the location of the segregated ballast tanks is acceptable; and(ii) Plans and calculations to substantiate compliance with the segregated ballast capacity requirements in § 157.09(b) ; or(2) Submit to the Officer in Charge, Marine Inspection, of the zone in which the first U.S. port call is made, a letter or document from the government of vessel's flag state certifying that the vessel complies with the segregated ballast capacity requirements in § 157.09(b) or Regulation 13 of the MARPOL 73/78.(c) On January 1, 1986, or 15 years after the date it was delivered to the original owner, or 15 years after the completion of a major conversion, whichever is later, before that vessel enters the navigable waters of the United States, the owner or operator of an existing foreign vessel under § 157.10c(b)(1) or § 157.10c(c)(1) must- (1) Submit to the Commandant (CG-CVC), Attn: Office of Commercial Vessel Compliance, U.S. Coast Guard Stop 7501, 2703 Martin Luther King Jr. Avenue SE., Washington, DC 20593-7501- (i) A letter from the authority that assigns the load line to the vessel finding that the location of the segregated ballast tanks is acceptable; and(ii) Plans and calculations to substantiate compliance with the applicable segregated ballast capacity requirements in § 157.09(b) or § 157.10c(d) ; or(2) Submit to the Officer in Charge, Marine Inspection, of the zone in which the first U.S. port call is made a letter from an authorized CS or the government of the vessel's flag state certifying that the vessel complies with the segregated ballast capacity requirements in § 157.09(b) or § 157.10c(d) .CGD 82-28, 50 FR 11626, 11630, Mar. 22, 1985, as amended by CGD 88-052, 53 FR 25122, July 1, 1988; CGD 96-026, 61 FR 33668, June 28, 1996; USCG-2000-7641, 66 FR 55573 , Nov. 2, 2001; USCG-2006-25150, 71 FR 39210 , July 12, 2006; USCG-2014-0410, 79 FR 38438 , July 7, 2014 Reporting and Recordkeeping requirements approved by the Office of Management and Budget under control number 1625-0036