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4 <br />W <br />O <br />U <br />E <br />a <br />0 <br />0 <br />i <br />o <br />N C <br />fD a:.0 <br />Avg <br />4 r <br />D <br />0 <br />Z d <br />30 d� <br />In <br />J � <br />o <br />Ln <br />418 <br />3 0 <br />+/ n <br />a r, <br />00 <br />s <br />0 <br />a <br />0 <br />W C <br />LZ 0s <br />a <br />W In <br />Z vi <br />� w <br />Z <br />Z <br />Q� <br />n � <br />0'-5' SOIL/OVERBURDEN <br />15'-20' p <br />SAND/GRAVEL SLURRY <br />I WALL <br />HISTORIC GROUND <br />OVERBURDEN BACKFILL <br />--------------------.. ,_-- - --- <br />3' MINING SLOPE <br />1' <br />12" TOPSOIL <br />DRY CELL <br />SLURRY WALL RECLAMATION <br />POTENITIAL <br />OVERBURDEN <br />OR IMPORTED <br />BACKFILL <br />N.T.S. <br />NORTH <br />N IF, <br />300 0 300 600 900 <br />{ IN FEET <br />1 inch = 300 ft. RECEIVED <br />SEP 19 2018 <br />[DIVISION OF RECLAMATION <br />MINING & SAFETY <br />LEGEND: <br />PERMIT BOUNDARY <br />PROPOSED HAUL ROAD <br />PROPOSED MINING LIMITS <br />EXISTING PARCELS <br />EXISTING DITCH <br />EXISTING GAS LINE <br />EXISTING OVERHEAD ELECTRIC <br />EXISTING EASEMENT <br />EXISTING 5 FOOT CONTOUR <br />EXISTING 25 FOOT CONTOUR <br />PROPOSED 5 FOOT CONTOUR <br />PROPOSED 25 FOOT CONTOUR <br />NOTES: <br />GAS <br />OHE <br />._.4880— — <br />----4700-- o <br />Z <br />4880- <br />---4700- <br />1 The proposed final land use for the Irwin/Thomas Mine is general agriculture. <br />2. Reclamation Plan Map illustrates conditions when no, or minimal, off-site backfill material is available <br />and a permanent source of water for long-term augmentation of exposed groundwater could not be <br />obtained. <br />3. If adequate quantities of off-site backfill material and a long-term augmentation plan are not available, <br />mining will not progress into MA2, MA3, or MA4 and existing conditions will remain undisturbed. <br />4. The bottom elevation of the dry cell may vary depending upon the availability of backfill material. <br />5. All slopes shall be graded to 3H:1 V or flatter. Slopes within the St. Vrain Creek delineated 100 -year <br />floodplain shall be graded to 4HAV or flatter. Rough grading will establish final elevations, slopes, and <br />transitions. Transitions between top of slope and existing ground shall be graded with a smooth, <br />gradual topography. <br />6. Final grading will include addition of topsoil and surface preparation for revegetation. Special attention <br />shall be given to transitions from reclaimed areas to undisturbed land. <br />7. All available topsoil and overburden material will be used for backfilling and reclamation. <br />8. The growth medium for revegetation will be a combination of overburden and topsoils. <br />9. The reclamation seed mix will provide quick soil stabilization and erosion control. The mix will allow for <br />further agricultural or other development expected to occur following permit release. <br />Upland Grass Seed — Soil Stabilization PPIication ate' <br />(#PLS/acre) <br />Intermediate Wheatgrass <br />3 <br />Blue Grama <br />0.75 <br />------------------- - --------------------- <br />Alfalfa <br />- --- ------------------ <br />0.75 <br />NOTAL <br />4.5 <br />pplication rate is for drill se -e ngA' Fsee <br />application rate will be doubled. <br />is to eroa cast, t e <br />10. Grass seed will be planted with a drill equipped with depth bands and press wheels. The seeded area <br />will then be covered with certified weed -less straw mulch at a rate of 2,000 pounds per acre. The straw <br />will be crimped into the soil to control erosion until the grass becomes established. <br />11. Drill seeding is the preferred method for revegetation. If broadcast seeding is necessary on moist soils, <br />steep slopes, or in excessively rocky areas, success can be encouraged by broadcasting onto growth <br />medium that is -very loose. If the seed is broadcast in those circumstances, then the seeded area will <br />be dragged to help bury the seed. <br />12. Periodic inspection for noxious weeds, at least once a year early in the season, will be done as part of <br />a weed management plan. <br />13. The mine office/scale house trailer and any other structures associated with mining will be removed <br />from the site during final reclamation activities. <br />14. Best Management Practices will be used to control erosion and stormwater suspended sediment runoff <br />from the site during reclamation activities. <br />CALL UTILITY NOTIFICATION CENTER OF <br />COLORADO <br />Know what's below. <br />Call before you dig. <br />CALL 2 BUSINESS DAYS IN ADVANCE BEFORE <br />YOU DIG, GRADE, OR EXCAVATE FOR THE <br />MARKING OF UNDERGROUND MEMBER UTILITIES. <br />W <br />Z <br />G <br />U) <br />O <br />Z <br />Z <br />Z <br />O <br />F_ <br />U <br />d. <br />W <br />CL <br />j <br />r� <br />Q <br />Z) <br />� <br />W/ <br />L.L.. <br />N <br />N <br />o <br />J 00 <br />J <br />D <br />Q <br />0 N U <br />-* u� <br />� <br />N c <br />Lu 03 <br />b o <br />M a..' u_ <br />.C:C <br />"1 Q <br />Z3 <br />AN 0 <br />W W <br />_(DD <br />r <br />m <br />z <br />x <br />w <br />Q <br />J <br />U <br />W <br />0� <br />Date: October, 2018 <br />Job No: 590-008 <br />Drawn: C. Snowdon <br />Design: B. SCHENDERLEIN <br />Checked: B. SCHENDERLEIN <br />Scale: 1" = 200' <br />Sheet <br />1 of: 4 <br />O <br />W <br />0 <br />< <br />�— <br />Q <br />j <br />O <br />�n <br />V <br />U <br />> <br />W <br />Ci) <br />W <br />z <br />r^ <br />(�,,!J� <br />� <br />n,/ <br />0 <br />V— <br />0� <br />W <br />Q�n <br />V , <br />J <br />o <br />^� <br />m <br />Z <br />r <br />m <br />z <br />x <br />w <br />Q <br />J <br />U <br />W <br />0� <br />Date: October, 2018 <br />Job No: 590-008 <br />Drawn: C. Snowdon <br />Design: B. SCHENDERLEIN <br />Checked: B. SCHENDERLEIN <br />Scale: 1" = 200' <br />Sheet <br />1 of: 4 <br />