Section 461, act May 19, 1896, ch. 208, 1, 29 Stat. 126, prohibited deposit of ballast, dirt, ashes or oyster shells into Potomac River except for purpose of making a wharf and then only after approval. Section 462, act May 19, 1896, ch. 208, 2, 29 Stat. 127, prohibited deposit of dead fish, dead animals, fruits, vegetables, ice, snow, filth or trash of any kind into Potomac River. Section 463, act May 19, 1896, ch. 208, 3, 29 Stat. 127, related to penalties. Section 464, act May 19, 1896, ch. 208, 4, 29 Stat. 127, provided that none of these provisions be construed to interfere with any work or improvements in harbor or river area.