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Emergency Remedial Actions <br />Downstream Seepage/Sinkhole: <br />What if seepage pushes filter sand <br />away? <br />Add gravel or riprap first to spread <br />out flow and then continue <br />building filter as described. <br />Build a berm or cofferdam to <br />create a pond of water at the exit <br />point to put hydraulic back <br />pressure on the seepage