you fell down of course, and then you got up of course, and you started over...

[myurbandream]

research, day two:

circular tremie-based cofferdams

http://www.pdhonline.org/courses/g113/g113.htm

http://en.wikipedia.org/wiki/Cofferdam

http://www.dot.il.gov/bridges/Design%20Guides/3.13.3-Cofferdam%20Seal%20Coat%20Design.pdf

http://bidding.carriercreek.com/filemgt/generalconditions/division2/02178%20Steel%20Sheet%20Pile%20Cofferdams.pdf

ftp://imgs.ebuild.com/woc/C620261.pdf

http://www.tdot.state.tn.us/Construction/Special%20Provisions/604F.pdf

http://courses.washington.edu/cm420/Lecture8.pdf