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.~ <br />Memo to Berhan Keffelew 3 February 8. 1995 <br />Summary and Conclusion: <br />The operator must provide the Division with data on the volume pumped from <br />the leak collection sump during each pumping episode. The date and time <br />of each pumping episode must be correlated with the volume data. If the <br />volume pumped during any single pumping episode exceeds 11,220 gallons, <br />the Division should require the operator to pump more frequently. <br />Ideally, the leak collection pumps would be fitted with switches activated <br />by pressure transducers, to make them self activating, however there would <br />be a concern with unobserved pumping and the potential for process water <br />to be sprayed outside the lined area. <br />If the pumping data reveals that more than 26,490 gal/day is being pumped <br />from the leak collection sump, the Division should be concerned that flaws <br />in the upper geomembrane are more numerous, or are larger, than would be <br />acceptable, and a remedial action by the operator may be required. <br />cc: Jim Pendleton <br />Carl Mount <br />Bruce Humphries <br />Reference: <br />1. Giroud, J.P. and R. Bonaparte. 1989a. Leakage through liners <br />constructed with geomembranes - Part 1. Geomembrane liners. <br />Geotextiles and Geomembranes. Vol. 8: 27-67. <br />