First, the answer to Vol. 13 (last week).
Those of you who commented nailed the GCL being dragged across the subgrade, which should be avoided! Another biggie that is often done and overlooked is the choker hold around the GCL to drag it. It still unfortunately is a practice (bad) to bunch GCL together, wrap a strap around it, and drag it (bad) – 2 “wrongs” doesn’t equal a “right”. This damages the GCL in a several ways such as thinning the material in the bunched/tied area, exposes the GCL (and sometime overlying components including the geomembrane to unnecessary damage from items loosened in the subgrade.
I’m not sure about the overlap being an issue but it would definitely be a good idea to check! I’ve seen GCL materials occasionally lose printed overlap lines for portions of a roll to several sequential rolls – not sure if that is the case here or not. The bentonite should be in the overlap area applied after placement so we can’t tell if that is correct without picking up a sheet and looking (which I recommend if you can’t walk the entire seam).
In these blog posts, Do You See What Glen Sees, I will present a photograph or short video related to earthwork or geosynthetics construction and have you identify the significance of what you’re seeing.
It could be things being done correctly or incorrectly. Primarily, these will be things that impact quality.
In addition to my blog, I’ll post this content on X and LinkedIn. You can post your response on one of those two.
I’ll give you my thoughts on each photo or video when I post the next installment.
Do you see what I see? Or did you find something I missed? I’m excited to find out!
