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• <br />• <br />2.05.6(6) <br />37 -D <br />Line Towers <br />Quarterly <br />Transmission Line <br />Aqueduct & <br />typically June and <br />To measure subsidence if any along <br />PL -08 to PL -17 <br />Stevens Gulch <br />Quarterly <br />the Pitkin Mesa Pipe Line & Stevens <br />Road <br />Gulch Road <br />Subsidence Monitoring <br />Monument Location Frequency Purpose <br />Color aerial USDA -FS 5 Year intervals To monitor the topographic surface, <br />photographs Managed Surface beginning in 2001 soil and vegetation through <br />until two years interpretation of color aerial <br />after mining. photographs <br />Visual <br />Known historic <br />Twice per year, <br />Determine if mining has rejuvenated <br />and modem <br />typically June and <br />or created new landslides. <br />landslides within <br />November. <br />the permit and <br />adjacent area. <br />Visual <br />Sheep Corral <br />Within 3 months <br />Monitor for surface fractures that may <br />Drainage <br />after the B -8 <br />cause interruption of surface flows, <br />bleeder entries <br />damage stock ponds or create large <br />are developed, <br />fractures that will need to be <br />and on a <br />mitigated. <br />quarterly basis <br />thereafter during <br />mining of panels <br />B -8 and B -9, and <br />for six months <br />Panel x-11 eigtA <br />Fnenuments on <br />At the- edge -of <br />p 11 <br />post mining. <br />Quaitedy and <br />meFe fFequently <br />ene-"ne <br />All other <br />Over mining area <br />to eaptUFe the <br />At the discretion <br />. <br />To develop subsidence data to <br />monuments <br />of the Operator <br />support future mine plan expansions. <br />• PR -12 <br />/a PPRovE.D <br />2.05-165- <br />02/10 <br />