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GENERAL51208
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Entry Properties
Last modified
8/24/2016 8:37:37 PM
Creation date
11/23/2007 6:37:15 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
General Documents
Doc Date
2/21/1995
Doc Name
CRESSON MINE HEAP LEACH PAD-PHASE 1 AUDIT OF LEAK COLLECTION SYSTEM PERFORMANCE PN C-80-244
From
DMG
To
BERHAN KEFFELEW
Media Type
D
Archive
No
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<br />Memo to Berhan Keffelew <br />CRESSON Leak Collection Audit <br />page 4 <br /> <br />(1) Precisely determine the rate of leak collection <br />The first task is to precisely determine the rate of leak <br />collection effluent production. The inaccuracy of the flow <br />meter has to be corrected. CC&VG hypothesizes that the flow <br />meter is inaccurate because of air entrainment in the <br />collection sump effluent. The problems caused by air <br />entrainment might also be nullified by introducing the pumped <br />effluent into a stilling vessel. In this manner the deaerated <br />fluid can be metered. As an alternative a tank could be <br />installed to allow volumetric measurement of the pumped <br />effluent. <br />Air entrainment in a well normally occurs because the pumping <br />rate exceeds the yield of the sump or a leak exists in the <br />production pipe above the pump. Either of these conditions <br />will accelerate wear and tear on the pump and lead to <br />premature failure. Further, the vibration resulting from pump <br />cavitation can be detrimental to the structural integrity of <br />the well bore, casing, liner, and other components. Pipeline <br />continuity can be determined by pressure testing. Once the <br />actual productivity (specific yield) of the sump has been <br />determined, the pump could be sized to correspond to the <br />expected production rate. A properly sized pump should pump <br />continuously at precisely the correct pumping rate. This <br />avoids the power consumption spikes of pump startup and <br />minimizes the fluctuation in hydraulic head within the leak <br />collection layer and sump. In order to comply with the <br />prohibition of head in excess of 2.0 feet in the leak <br />collection layer it will be extremely important to minimize <br />the head fluctuations occurring in the collection sump. Head <br />fluctuations could increase the probability of leakage through <br />the composite liner. <br />Whichever corrective measures are implemented to resolve the <br />existing inaccuracies in determining leak collection <br />production rates, CC&VG should also implement automated <br />recording of the operating times of the pumps, the <br />instantaneous and cumulative production rates. <br />(2) Compare the actual leakage rates with the projected acceptable <br />leakage rates <br />The second task is to project the acceptable maximum leakage <br />rate for the current saturated area of the heap leach pad. <br />Methodology has been approved by the EPA for use in analyzing <br />and projecting the expected leakage from RCRA waste disposal <br />facilities. This methodology was used by CC&VG's design <br />
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