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I' <br /> <br /> Hean Leach Pads <br /> 0 to 20 gallons/acre/day (gpad) No response required. <br /> 20 to 100 gpad Report to MLRD,additional <br /> monitoring implemented, pump <br />' from sump as required. <br /> 100 to 300 gpad Locate area of leakage, <br /> change pad loading/spraying <br />' to reduce leakage, pump from <br /> sump as required. <br /> 300-500 gpad Leakage area shutdown until <br /> leaks repaired. <br /> > 500 gpad Leakage area shutdown, <br /> replace primary liner. <br /> Pregnant and Barren Ponds <br /> 0 to 20 gpad No response required. <br /> 20 to 130 gpad Report to MLRD, additional <br /> monitoring required, pump <br /> from sump as required. <br />130 to 300 gpad Locate areas of leakage and <br />operate ponds to minimize <br />leakage if possible or <br />repair. <br />300 to 3,000 gpad Repair leaks. <br />> 3,000 gpad Pond shutdown, replace <br />primary liner. <br />Exhibit D, Section D.T.4.3 revised to include this information 4/20/89. <br />Section D.8 Project Water Ba)ance <br />Section D.8.2 Neap Leach facility <br />44. The narrative explains the drairdown from deactivated areas has been <br />estimated at 10 gallons per ton of ore with the remainder of solution <br />being held by capillary forces at the estimated field capacity of 12 <br />percent moisture content. Please discuss whether laboratory <br />measurements were taken to verify either the 10 gallon per ton <br />I draindown or the remaining 12 percent remaining moisture content of the <br />ore sized material. If not, please consider doing so such that water <br />balance and pond size design specifications can be verified. <br />Response: A 12% field capacity moisture content has been derived from the <br />laboratory testing program for the permeability test as the <br />residual moisture content. This is discussed in Section D.3 and <br />presented in Appendix D. Saturated direct shear testing has <br /> <br />