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If he is responsible for the future maintenance and the dismantling process is not charged, then there is no need to rework, it is best to sign a contract or let him leave a written agreement, otherwise it must be reworked, can not be sealed, half sealed, not sealed at all will have a peculiar smell.
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Personally, I don't think it's necessary to leave a manhole. The top 2 floors will not be easily clogged.
If it is the top layer, there is no need to stay, however, the specification requires to stay.
Under normal circumstances, the washing machine will not be blocked, unless there is garbage and oil that can clog the sewer pipe, or something else.
The thick riser main pipe belongs to the public facilities, and the property department is responsible for it, and the branch pipe is responsible for whoever uses it (exclusive pipeline).
The construction should be carried out in strict accordance with the drawings, after all, it is related to the sewerage of the entire floor, for reference.
Good. Nothing bad. Aren't the 1-16 of your gate all on the east side? So is my family. My house is on the 10th floor. The more you think about it, the more you think it's bad. It's good.