2014-05-13_PERMIT FILE - C1996083A (3)

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2.05.6(6) Subsidence Monitoring Monument Location To measure subsidence if any along Purpose Aqueduct & USDA -FS the Pitkin Mesa Pipe Line & Stevens PL -08 to PL -22 Stevens Gulch Quarterly Gulch Road soil and vegetation through Road Monitoring to Begin One Year Before interpretation of color aerial Longwall Mining in the Area photographs Visual Known historic To measure subsidence if any to Determine if mining has rejuvenated Turkey Track and modem Turkey Track Structures 43 -A, B & C Structures Quarterly Monitoring to Begin One Year Before the permit and Longwall Mining in the Area adjacent area. Longwall Mining Projected in 2016 Subsidence Monitoring Monument Location Frequency Purpose Color aerial USDA -FS 5 Year intervals To monitor the topographic surface, photographs Managed Surface beginning in 2001 soil and vegetation through until two years interpretation of color aerial after mining. photographs Visual Known historic Twice per year, Determine if mining has rejuvenated and modem typically June or created new landslides. landslides within and November. the permit and adjacent area. Visual Sheep Corral Within 3 months Monitor for surface fractures that may Drainage after the B -8 cause interruption of surface flows, bleeder entries damage stock ponds or create large are developed, fractures that will need to be mitigated. and on a quarterly basis thereafter during mining of panels B -8 and B -9, and for six months post mining. All other Over mining area At the discretion To develop subsidence data to monuments of the Operator support future mine plan expansions. PR -13 2.05-164- 02/13