Background and most recent GRI standards

August 1, 2007  |  Products

By Bob Koerner In the 1980s, while supervising graduate research students in their geosynthetics theses topics, the issue of writing generic and standardized procedures arose in this (quite new at the time) geosynthetics field. Rob Swan generated our first formalized test methods with what became GR…
Caveat venditor—When practice is far from theory

June 1, 2007  |  Products

By Ian D. Peggs At the Geosynthetics-2007 conference earlier this year in Washington, I had dinner with a geomembrane manufacturer colleague and he asked me, “How should we respond to a customer’s question: ‘Is your geomembrane compatible with my chemical solution of A, B, C, at XY…
Geotextile transport layer

June 1, 2007  |  Products

From the GMA Techline Subject: Geotextile transport layer We need some information about the characteristics of the transport layer (special geotextile) used in association with leak-detection sensors and placed between a drainage geocomposite layer (geonet plus geotextile separator) and the HDPE ge…
Cost estimate data

June 1, 2007  |  Products

From the GMA Techline Subject: Cost estimate data In 2006, we completed a 30-acre pond (depth, approximately 30 ft.), and now we want to estimate the cost for a pond of similar size for a construction start in November 2007. For estimating purposes, are you able to suggest a percentage increase that…
Geogrid-reinforced soil mat

June 1, 2007  |  Products

From the GMA Techline Subject: Geogrid-reinforced soil mat I am considering a geosynthetic-reinforced soil mat to be placed under a building structure with conventional footings. The purpose of the soil mat would be to limit differential settlement across the building footprint in event of seismical…
Geotextile fabric

June 1, 2007  |  Products

From the GMA Techline Subject: Geotextile fabric We are specifying geotextile fabric: between the soil media (in a raingarden) and the underlying stone that contains the underdrain pipe. between the sod and the underlying stone (water quality swale) that contains the underdrain pipe. the top, bottom…
AOS vs. EOS

June 1, 2007  |  Products

From the GMA Techline Subject: AOS or EOS? What is the difference between AOS (Apparent Opening Size) and EOS (Equivalent Opening Size)? (Larry, Louisiana) Reply: The real answer is: “Not much.” Now let me answer your question. The U.S. Army Corps of Engineers developed AOS in 19…
Geomembrane raincoat liners in the mining heap leach industry

April 1, 2007  |  Products

By Allan J. Breitenbach and Mark E. Smith Introduction Raincoat liner (RCL) terminology is used in the mining heap leach industry in reference to a temporary exposed geomembrane cover (EGC) that minimizes rain stormwater infiltration into the ore heap fill and diverts cover surface storm runoff to t…
English seaside resort to get Europe’s first artificial surf reef

April 1, 2007  |  Products

A project has started to create Europe’s first artificial surf reef on the south coast of England. Sand-filled geotextile bags will be submerged east of the Boscombe pier, intended to create waves up to 13 ft. high and double the number of good surfing days to more than 150 each year. The £1.4 mi…
Using structured geomembranes in final solid-waste landfill closure designs

February 1, 2007  |  Products

By Ronald K. Frobel, MSCE, P.E. Introduction Slope failures on final cover systems for solid-waste landfills have been well-documented during the past 20 years with many failures of note within the past three years. Sliding failures have occurred despite known geotechnical reasons for failures and k…