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�;�, � - Barrier Layer <br /> k Repair(4 inches <br /> of bentonite) <br /> 7 <br /> Photo 4: Typical Trench barrier layer repair with bentonite for wells <br /> EW-40, EW-41 and EW-42 <br /> tl <br /> f <br /> i <br /> i,. <br /> w <br /> Photo 5: Bentonite barrier thickness verification <br />