; and (B) the bypass occurred during normal periods of equipment downtime or preventive maintenance. (4) Notice requirements (A) In general The Administrator, in collaboration with States having publicly owned treatment works subject to paragraph (2), shall establish notice requirements, which shall provide for the method, contents, and public availability of the notice, for bypasses (other than bypasses described in paragraph (2)(B)) and combined sewer overflows. (B) Initial notice requirements In carrying out subparagraph (A), the Administrator, in collaboration with States described in such subparagraph, shall require an initial notice— (i) to be made as soon as possible after a bypass (other than a bypass described in paragraph (2)(B)) or a combined sewer overflow occurs; and (ii) to include, at a minimum— (I) the exact dates and times of the bypass or combined sewer overflow; (II) the volume of the bypass or combined sewer overflow; and (III) a description of any public access areas affected. (C) Follow-up notice requirements In carrying out subparagraph (A), the Administrator, in collaboration with States described in such subparagraph, shall— (i) establish follow-up notice requirements that provide for a full description (including water quality data) of each event for which an initial notice was required, the cause, and plans to prevent reoccurrence