Each month Tim Stark introduces a new technical topic for discussion and possible action. This month’s topic is: “Longevity of Geonets and Geotextiles”. This topic generated significant discussion with the main “take-aways” being listed below:

1.           Longevity of Geonets

·        Little performance specifications

·        No longer using an AOS requirement; no FOS

·        Civil v. Environmental grade geotextiles -

·        What is happening under the geomembrane?

·        Research – check embedment of geonet on GM without a cushion GT – when to transition to a composite

·        Industry moving to composites from sands and gravels – so check compatibility of nets with flexible GMs – Brian and Rohit webinar on net and 40 mil GM

 2.           Longevity of Geotextiles

·        Little performance specifications

·        No longer using an AOS requirement; no FOS

·        Civil v. Environmental grade geotextiles -

·        Are geotextiles chemically resistant to liquidsbeing contained?

·        Kerry Rowe – double composite liner system – GCLgeotextile decomposed

·        No specs to excavate and check the geonet andgeotextile

·        Intercell berm excavations look good –

·        Compatibility b/t net and GTs – Polyester & Polypropylene GTs -

·        Compatibility b/t net and GMs – use same resin for both – no spec requiring same resin as GM

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