; with or without warrant, arrest any person who, in the Commander's presence or view, violates a provision of section 311 of the FWPCA [33 U.S.C. 1321] or any regulation issued thereunder; and execute any warrant or other process issued by an officer or court of competent jurisdiction, as prescribed in section 311(m)(2) of the FWPCA [33 U.S.C. 1321(m)(2)(A)]; and(7) Determine for purposes of sect