Must sewer and water penetrations through concrete walls be sealed?

Yes, annular space between sleeves and pipes shall be filled or tightly caulked with coal tar, asphaltum compount, or other material found equally effective and approved as such by the administrative authority. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.