HNY to all

February 1, 2015  |  Editorial

By Ron Bygness Special Happy New Year (HNY) greetings are in order for our many readers, contributors, and colleagues involved with geosynthetics and Geosynthetics magazine. And HNY for all of our acronym friends who especially stood out in 2014: HNY, EPA—The U.S. Environmental Protection Agency w…
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…
Part 1: The first double geomembrane liner 40 years later

February 1, 2015  |  Products

First constructed in June 1974 and has been in continuous service since then. By J.P. Giroud and J.P. Gourc Introduction The first double liner with two geomembranes was constructed in June 1974 and has been in continuous service since then. The double-lined structure is a water reservoir located in…