GRI Standards

April 1, 2008  |  News, Q&A: GMA Techline

From the GMA Techline Subject: GRI Standards — I am seeing references to GRI Standards GM 10, GM 14, and GM 18 in a project spec for a facility that will be under construction soon. There are other references too, of course, but these I’ve listed are not current, according to your Web si…
Slack calculations

April 1, 2008  |  News, Q&A: GMA Techline

From the GMA Techline Subject: Slack calculations — Do you have a reference that discusses the impact of environmental conditions and the procedures for determining “slack” into an HDPE liner at the time of installation? (Rod, California) Reply: The subject of calculating slack in …
Access roads on HDPE liners

October 1, 2007  |  Q&A: GMA Techline

GMA techline answers from Bob Koerner Subject: Access roads on HDPE liners— I am designing a temporary waste storage facility that will be lined with a 1.5mm HDPE liner. The facility requires access roads for the life of the facility—18 months. The access roads will be installed directly…
HDPE welds

October 1, 2007  |  Q&A: GMA Techline

From the GMA Techline Subject: HDPE welds— For HDPE geomembranes, I am looking for information on what effect there might be, if any, on the integrity of a fusion weld when an extrusion weld is placed directly on top of it. This condition exists when completing patches at T-intersections, but …
Product specification

June 1, 2007  |  News, Q&A: GMA Techline

From the GMA Techline Subject: Product specification We are proposing to stabilize a section of eroded riverbank with riprap. We would like to install a fabric beneath the riprap to hold the existing sandy soils in place. Can you give us a recommendation? The river is tidal and the area is exposed t…
Geotube questions

April 1, 2006  |  Q&A: GMA Techline

From the GMA Techline Subject: GeotubeI refer to the article “Saving Yucatan’s Coast” published in the September 2005 issue of GFR (now Geosynthetics), pages 34-39. Can you please let me know the following: What mathematical calculation was used to derive the appropriate ground lev…
Measuring puncture resistance

January 1, 1970  |  Q&A: GMA Techline

From the GMA Techline RE: Measuring puncture resistance How can I measure hydrostatic puncture resistance of a geomembrane in the field with different conditions (with or without geotextile)? [My company] uses geomembrane in agricultural pools. (Elham) Reply: The test you are looking for is ASTM D57…