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Avoiding geomembrane whales and hippos in surface impoundments
April 25th, 2016
The incidence of geomembrane whales/hippos in surface impoundments containing various types of liquids is, unfortunately, not uncommon. See, for example, GSI White Paper #30, which discusses corrective actions after they occur. This article, however, addresses the situation before it occurs. Clearly, the presence of a geomembrane creates anomalies in the underlying subgrade that can cause […]
Geotextile question
February 1st, 2016
We have a geotextile AOS requirement of 0.15mm for which we have recommended a 10-ounce geotextile to our client. Because our client has an abundance of 8-ounce geotextile on-site, he would prefer to make use of it in place of the recommended 10-ounce. My question to you is this: Can two layers of 8-ounce geotextile […]
Reinforcement deformations
February 1st, 2016
You made a presentation in Peru where you talked about a new method to calculate deformations on reinforced embankments. Now I am working on a project where the foundation needs to be, in part, over consolidated tailings. Even though we are putting rockfill embedded on the tailings, our pseudo-static analyses result in a FS of […]
MQA and GRI specs
February 1st, 2016
There is much inconsistency regarding the definition of a production batch quantity for geomembranes and how this relates to MQA sampling frequencies. What is the intent of the GRI specifications? Maggie | Australia Maggie, Regarding MQC—the factory production of like material—the GRI specifications give the frequencies of each particular test. These values were the subject […]
LLDPE Question
February 1st, 2016
“Burnout” occurred when the double-seam fusion welder got stuck as it welded (a stop at a small crease or at times going up a slope) followed by the welder sitting in one spot for a short time causing a burn hole in the LLDPE. The welder continues from that point onward once the situation is […]
Breathable membrane
February 1st, 2016
I am a graduate student pursuing a Ph.D. in environmental engineering. My project involves solving sanitation issues of urban slums in India using breathable membranes. We use a 55-gallon drum lined with this breathable membrane to serve as collection and storage for the fecal matter. We have been pursuing modifications on the project design and […]
Exposed geomembrane cover
February 1st, 2016
I am evaluating the feasibility of constructing an exposed geomembrane cover on a coal combustion residuals (CCR) fly ash impoundment. The evaluation includes scenarios of: (1) allowing surface water to shed and (2) intentionally impounding water. In reviewing the available literature, I came across your article “Traditional vs. exposed geomembrane landfill covers” (Geosynthetics, October/November 2012). […]
Spray over HDPE?
February 1st, 2016
Is it possible to spray over an HDPE liner? Can you provide me with spray manufacturers? Abbey | Saudi Arabia Abbey, There is no need to spray on HDPE, and even if you did it wouldn’t stick very easily. Regarding spray manufacturers, just Google “spray applied membranes” and you will get information in this regard. […]
Geocomposite drainage layers
October 1st, 2015
Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. I wonder about your opinion on the use of a triplanar geocomposite for landfill drainage layer. We have not approved these in our jurisdiction to date. I have a current application where this is proposed to be used (vertical expansion). I […]
Saturated soil cover on liner question
October 1st, 2015
Questions and answers from the GMA Techline. I need your advice on a reservoir we are designing. It is an irrigation reservoir with a 40-mil HDPE geomembrane liner on a 3:1 slope. The client wants to cover the liner with 1ft of silt loam soil. The water elevation in the reservoir will fluctuate about 15ft […]