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September 24,2020 C-1980-007/West Elk Mine LDS <br /> ventilates the gas from the caved area after the longwall has passed. The mine ventilation plan requires that the <br /> methane concentration in the caved areas of the mine be maintained above 25%,well above the methane explosive <br /> range of 5-15%,while the concentration of methane on the working face and in open areas of the mine must be <br /> well below the explosive range.Mr,Clawson explained that the flare shuts off automatically if the methane <br /> concentration drops too low(below 25%),or if the gas pressure in the well drops too low.MCC were still refining <br /> operational practices with the goal of keeping the flare running. <br /> All of the equipment close to the flare on the pad was electrically connected to a ground field. In order to <br /> achieve a sufficiently low resistance,the ground field had been constructed by burying a series of metal plates in a <br /> 150' long trench on the pad. <br /> A fire box containing extinguishers and hand tools was readily accessible on the SSI-5 pad. <br /> DOCUMENTS RECEIVED <br /> N/A <br /> OTHER(SPECIFY) <br /> N/A <br /> Number of Partial Inspection this Fiscal Year: 3 <br /> Number of Complete Inspections this Fiscal Year: 1 <br /> Page 3 of 13 <br />