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Pond Leak Detection Vault <br /> SUMP pump system. <br /> LW-002 LW-001 Upper Lower <br /> Manometer (L-1 Portal) Manhole' Manhole <br /> Date (inches) ( m) ( m) ( m) Other <br /> 12/27/16 NM NM NM 2.15 <br /> 1/25/17 NM NM NM 2.26 Evaporation Pond Leak <br /> Detection Vault sump <br /> PUMP float switch failure. <br /> 2/1/17 NM NM NM NM Replaced float switch. <br /> 2/8/17 NM NM NM 2.13 <br /> 2/22/17 NM NM 2.02 2.08 <br /> 3/1/17 NM NM 2.01 2.11 <br /> 3/10/17 11.25 1.37 NM NM Download LW-001 flow <br /> meter;emptied LW-002 <br /> pipe. Pond inspection. Pond <br /> Leak Detection pump <br /> failure. <br /> Table 4 Notes: LW-002 discharge originates at the Research Mine portal,the manometer measures head behind a <br /> concrete dam inside the sealed adit. <br /> 2 LW-001 discharge originates at the L-1 portal of Logan Wash Mine and during the reporting period discharged into <br /> the Infiltration Trench.All measurements recorded by electronic flowmeter display. <br /> 3 Upper Manhole is located on Retort Water Pipeline in Logan Wash approximately 3000 ft down drainage of the <br /> Lower Dump. <br /> 4 Lower Manhole is located on Retort Water Pipeline immediately north of Evaporation Pond. <br /> NM=not measured <br /> 4 <br />