Section 1232, Pub. L. 92–340, § 13 , as added Pub. L. 95–474, § 2 , Oct. 17, 1978 , 92 Stat. 1478 ; amended Pub. L. 101–380, title IV, § 4302(j) , Aug. 18, 1990 , 104 Stat. 539 ; Pub. L. 104–324, title III, § 312(b) , Oct. 19, 1996 , 110 Stat. 3920 ; Pub. L. 115–44, title III, § 315(b)(2) , Aug. 2, 2017 , 131 Stat. 949 , related to enforcement provisions. See section 70036 of Title 46 , Shipping. Section 1232a, Pub. L. 92–340, § 14 , as added Pub. L. 101–599, § 2 , Nov. 16, 1990 , 104 Stat. 3040 , related to navigational hazards. See section 70012 of Title 46 . Section 1232b, Pub. L. 92–340, § 15 , as added Pub. L. 109–241, title VI, § 602 , July 11, 2006 , 120 Stat. 553 , related to requirement to notify Coast Guard of release of objects into the navigable waters of the United States. See section 70013 of Title 46 .