The 2nd International GSI–Asia Geosynthetics Conference

October 1, 2015  |  News

Some of you know that the Geosynthetic Institute (GSI) and Inha University, Incheon, Korea (Rep.), have had an association for more than 20 years. In June, we advanced this relationship during the 2nd International GSI–Asia Geosynthetic Conference. The conference chairman was Prof. Han-Yong Jeon o…
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Geocomposite drainage layers

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

Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. I wonder about your opinion on the use of a triplanar geocomposite for landfill drainage layer. We have not approved these in our jurisdiction to date. I have a current application where this is proposed to b…
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Saturated soil cover on liner question

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

Questions and answers from the GMA Techline. I need your advice on a reservoir we are designing. It is an irrigation reservoir with a 40-mil HDPE geomembrane liner on a 3:1 slope. The client wants to cover the liner with 1ft of silt loam soil. The water elevation in the reservoir will fluctuate abou…
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Geotextile data

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

Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. I am a student of hydraulic structures and I need some data about transmissivity of geotextiles (ASTM D4716 or ISO/DIS 12958); and also permittivity or cross-plane permeability (ASTM D5493 or every valid stan…
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Tight timeline + extreme specs = a notable RPE geomembrane install

October 1, 2015  |  Features

And with weather only Bigfoot could love. Introduction Northeastern British Columbia could, by most definitions, be considered the middle of nowhere. Tumbler Ridge (pop. 2,710), a district municipality in the foothills of the Canadian Rockies bordering Alberta, is and was from its inception in 1981 …
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Geosynthetics for the management, containment, and closure of CCR disposal facilities

October 1, 2015  |  Features

Background Coal combustion residuals (CCR) management and disposal facilities are facing an onslaught of increased scrutiny regarding environmental concerns in the form of the newly implemented CCR regulations and impending effluent limit guidelines and EPA’s 316(b) requirements for containment an…
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Protrusion/particle shape—geotextile cushions

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

Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMT Techline. Our landfill liner project specifications require the use of rounded to subangular gravel to be placed as a leachate drainage layer or leachate collection pipe bedding. The gravel is separated from the geomem…
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Zip-tie strength

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

Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. We had a problem at one of the construction projects where we were providing CQA. It turned out that the installer had two different types (and apparently strengths) of zip ties. There ended up being seam fai…
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GRI White Paper #10/Test Method GTI2(A)

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

Flammability? Zip ties? MARV? Ponds? GT specs? Questions and answers from the GMA Techline. I have reviewed GRI White Paper #10, GRI Test Method GT12(a), ASTM D4354, and ASTM D4759 and have a question. I have reviewed some recent CQA test results of a nonwoven cushion geotextile roll sample and whil…
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Nonwoven needle-punched GT

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

We specify that the geotextile under riprap must be nonwoven, needle-punched, Class 1. NCHRP Report 568 (page C-25, Section 7.1) requires that nonwoven geotextile filter under riprap must have a mass density greater than 12osy (ounces per square yard). We have the following questions: What is the co…
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