Geomembrane (GM) testing

June 1, 2015  |  News, Q&A: GMA Techline

Geomembrane testing? Root penetration? Welding HDPE with LLDPE? Woven geopipe? Questions and answers from the GMA Techline We have a project where we need to weld a section of new 1.5mm smooth HDPE geomembrane to an old one installed in 1999. Can you tell me which tests we have to take before we do …
GCL internal strength

February 1, 2015  |  Q&A: GMA Techline

Questions and answers from the GMA Techline GCL internal strength In section 6.3.4 of Designing with Geosynthetics Fifth Edition, the internal shear reinforcement for a GCL is calculated using the geogrid veneer reinforcement method. This results in an internal reinforcement strength using kN/m. Man…
Contact details

February 1, 2015  |  Q&A: GMA Techline

Questions and answers from the GMA Techline Contact details We are carrying out a landfill capping job for a solid waste site. The slope is 1:1.75 and [is currently] lined with an HDPE liner. The height of the bund is approximately 12.0m. As per clients’ direction, we are supposed to lay a 200…
Geomembrane cushioning with geocomposites

February 1, 2015  |  Q&A: GMA Techline

Geomembrane cushioning with geocomposites Geomembrane cushioning with geocomposites Questions and answers from the GMA Techline Geomembrane cushioning with geocomposites We’ve been doing work for some of our clients to try to use sub-angular crushed granite in leachate collection systems inste…
Asphalt over geomembrane?

February 1, 2015  |  Q&A: GMA Techline

Questions and answers from the GMA Techline Asphalt over geomembrane? We have a project where we want to place asphalt concrete over a 40mil-thick HDPE geomembrane. The asphalt concrete is 3in.-thick and would be the lining for a surface water ditch. On the outside of the ditch, we have a pavement s…
Mold in green roofinstallations

February 1, 2015  |  Q&A: GMA Techline

Mold in green roof installations Mold in green roof installations Questions and answers from the GMA Techline Mold in green roof installations Recently there has been a greater demand for sustainable projects in Southern California, so I was glad [to read the article in Geosynthetics magazine] &ldqu…
Landfill stats

February 1, 2015  |  Q&A: GMA Techline

Questions and answers from the GMA Techline Landfill stats How many landfills are there in the U.S.? How many of those are Subtitle D facilities? Of those, about how many have a cell that is lined each year? (Scott | USA) Scott, There are currently fewer than 2,000 active landfills in the U.S. Some …
Shale gas drilling wastewater

February 1, 2015  |  Q&A: GMA Techline

Questions and answers from the GMA Techline Shale gas drilling wastewater Do you know what kind of radioactive isotopes are found in shale gas flowback ponds? (Ed | Texas) Hi Ed, Bromine, radium, and radon are commonly brought to the surface with hydraulic fracturing. These natural radioactive eleme…
Landfill stability analysis

February 1, 2015  |  Q&A: GMA Techline

Questions and answers from the GMA Techline Landfill stability analysis We are involved in a landfill that is beginning to shows signs of distress on one 3:1 (H:V) slope. I am attempting to back-calculate the waste strength in the distressed area using 2-D limit equilibrium method and insipient fail…
Fish pond lining

October 1, 2014  |  Q&A: GMA Techline

Questions and answers from the GMA Techline Fish pond lining We have a project fixing an HDPE liner for a fish pond. Should we use HDPE liner 0.50mm? What would be the suitable covering sheet to protect the pond from UV? (Mustafa | Saudi Arabia) Mustafa, You ask good questions but ones that really r…