Glen Toepfer

First, the answer to Vol. 9 (last week). Everyone nailed the water and electric combination!  A true hazard no matter how you look at it, especially with the junctions being...

Everybody remember when you had to read through a scenario and then answer questions at the end?  Well, there’s a bit of reading to this one followed by three questions...

First, the answer to Vol. 8 (last week). Surprisingly, the biggest issue here is not the flipped body of the articulated haul truck; it is the laborer working directly downslope...

First, the answer to Vol. 7 (last week). The biggie here is the overlap of the extrusion on extrusion. I suggested they cut all the extrusion out and used a...

First, the answer to Vol. 6 (last week). Here are 14 things I noted, in order of occurrence. Dirt stripes. Dirt stripes negatively impact seam quality. Dirt stripe on top...

For such a short video, there were several things that I identified. I’ll post them in the order that I identified them. No rub sheet to set the extrusion welder...

On Tuesday, March 4th a special session is being held at the GEOTECHNICAL Frontiers 2025 conference to discuss welding of geomembranes. It is scheduled for 1:30-3:00 pm. Panelists for the...

Picture it – the Arizona Desert, June 15th 2011. A double-lined containment project encompassing nearly 200-acres. You’ve been working night shift on a liner installation six-days a week since April...

Great job everyone! You nailed this one, too! The two things I identified before putting this video up were the speed of the compactor in reverse and the spinning of...

Thank you everyone for the great responses! Once again, you nailed it! There were both safety issues and quality issues present in the photograph of double-sided drainage geocomposite. I’ll start...