Why do we do CQA? Well, here is what can happen if you don’t!!
Below is a quote referring to a wastewater treatment plant basin that was built about three years ago (2000) in western Europe. Our source understandably would like to remain annonymous!
"We found no subgrade preparation (deep ruts from vehicle tires, rocks sticking up etc.), hundreds of nails, pieces of reinforcement steel, chunks of concrete, miscellaneous steel debris, two by fours studded with nails (like a home made weapon), 4 x 8 sheets of plywood. There was one section of liner onto which one of the contractors appears to have dropped a section of rectangular concrete pipe. A square was essentially die cut through both liners and the geonet."
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These pictures (above) illustrate some of the debris found in the 450 mm thick soil cover layer on the reservoir liner.
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Shouldn’t this liner be protected from direct contact to the generator?
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Here is an unrepaired die-stamped hole found in the sump of a heap leach pad – from a 1 m diameter pipe.
There is no question that outside of landfill liners there is a great need for effective geosynthetics CQA.
