In the midst of a basement bathroom renovation, we discovered the former owners had done the plumbing all wrong... so we had to install new weeping tiles and waterproofing membranes..
The tracks weren't too bad, in spite of 10" of mud & muck --- http://www.pbase.com/enjayel/image/80938860

others participating in "Tracks", today's Totally Informal Transglobal Challenge can be found here:
http://forum.pbase.com/viewtopic.php?t=31552