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Joncrete (Civil/Environmental) (OP)
11 Jan 10 8:12
How can a large Wet Well (10' or 12') be Vacuum tested if the Access Hatch is not Air Tight?

And also other holes in the Top Slab such as holes for Electrical/Floats which can be difficult to plug.
bimr (Civil/Environmental)
11 Jan 10 13:33
Mechanically anchor a liner over the access hatch and seal with elastomeric sealant.

Use watertight pipe/electrical connections with gasketed pipe bell connectors or sleeves for boot type connectors.  

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