Issue description
If I create a pier on level 5 altitudine by dumping, when I finish I can't place a sea water pump since it's coliding with the material that was dumped.

I tried to add my save file but github won't allow .save files
Reproduction steps
Have trucks dump material on shore up to level 5.
Try to place sea water pump on the newly created shoreline.
waterPumpIssue.save
Game version and build number
v.0.8.2a b552
Operating system
Windows