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.J • <br />Memo to File M-1977-342 2 September 4. 2001 <br />that will trafficked onto the fill and the protection of the liner's integrity. The liner manufacturer's recommendations <br />must be followed in this regard. For example, would roller compaction of a one-foot layer, with potentially sharp <br />gravel lying directly on the liner, cause punctures? Should a geotextile cushion be installed over the liner prior to <br />placement of the gravel? What is a safe minimum thickness for sludge in order to move the conveyor out onto the <br />deposited material? What is the safe thickness for sludge in order to route LGP tractors and graders out onto the lined <br />area? It has been the Division's experience that the liner manufacturer can advise on these matters. Also, pressure <br />testing of the liner to determine puncture resistance characteristics may be conducted. <br />The final concern identified by the Division is with the proposal to possibly stockpile sludge on a lined area near Pond <br />1.2 and [hen campaign i[ into the hopper using a rubber tired front end loader. The Division would have [o review <br />a liner plan for the temporary stockpile area prior to approving this component of the proposal. The stockpile liner <br />would have to be durable, such as asphalt or concrete over a geosynthetic, and would have to be benned to prevent <br />mn on from contacting the stockpile and mnoff from exiting the stockpile area. Or the temporary stockpile area can <br />be laid out such that drainage from the stockpile will enter the Pond 1.2. <br />cc: Tony Lucero, Henderson Mine (via jncsimile transmission) <br />Carl Mount, DMG (via electronic moil) <br />c:\a•indows\personal\henderson sludge MTF.da: <br />