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POWDERHORN COAL COMPANY <br />SOUTH LEASES EXPLORATION PLAN <br />1985 <br />• Figure 1 <br />Typical Driil Hole Abandonment (U. S. G.S.) <br />winiw~w Cement plug or comparable plug <br />Heavy mud, Drill cuttings <br />or Cement <br />T ~ <br />:... <br />.....1 <br />._.:. <br />... <br />~.. <br />_.. <br />-~- ~ o <br />':.'_" ~n <br />.... 1 <br />... <br />• •~'~ SHALLOW HOLES (Drilled within stri in <br />~:: limit <br />Wager Aquifer:':: ~:• Holes must be backfilled with as many <br /><<?: cuttings as possible and surface plug <br />4w ~." <br />..:.... 1 set. <br />,.~. <br />...>. <br />+ DEEP HOLES (Drilled beyond stripping <br />.... p <br />'"~ limit <br />`' 'r' All water aquifers and minable coal <br />....:.. <br />"`• ~ beds must be cemented off and surface <br />.~. <br />!<~., plug set. <br />...:~ <br />.. . <br />- - ALL HOLES <br />1. Stripping limit is determined by <br />_ Area Mining Supervisor. <br />Heavy mud, =;_ 2. The surface plug must be set to <br />Drill Cuttings - ground surface, except in plowed fields, <br />or Cemen! where the plug must be sat below plow <br />:. depth. <br />_-"•• 3. Holes must be backfilled with as <br />many cuttings as possible. <br />`'• 4. Excess cuttings must be leveled <br />_~~ and dispersed evenly over the surface <br />.., surrounding the hole, or cuttings may <br />•'''~ ~ be hauled away to an approved disposal <br />,,.:. <br />±!; ~ site. <br />• <br />Co <br /> <br />