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…
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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 …
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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…
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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…
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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…
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Geomembrane patching

October 1, 2014  |  Q&A: GMA Techline

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Geomembrane patching Would it be acceptable to repair an existing 30-mil HDPE geomembrane liner system with 60-mil HDPE geomembrane pa…
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Fusion welds

October 1, 2014  |  Q&A: GMA Techline

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Double-track fusion welds Can you offer any guidance on the minimum allowable ambient temperature to perform double-track fusion welds…
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Geotextile filter

October 1, 2014  |  Q&A: GMA Techline

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Geotextile filter Are there any papers done on the use of a geotextile filter layer below a GCL or CCL? Your assistance in this regard…
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Bentonite compatibility

October 1, 2014  |  Q&A: GMA Techline

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Bentonite compatibility with propylene glycol Are there any issues regarding bentonite GCL compatibility with propylene glycol? Any in…
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Fabric-formed shells

October 1, 2014  |  Q&A: GMA Techline

Geomembrane patching? Landfill cooling? Puncture protection? Geomembrane patching? Landfill cooling? Puncture protection? Questions and answers from the GMA Techline Building fabric-formed concrete thin shells Any suggestions on the type of geogrid or geoweb fabric I can use for shaping and reinforc…
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