2012-08-13_PERMIT FILE - C1981018A (3)

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1 I Ij SH -3,' 'rte I dn, w� \ �n X Pond volumeaat point of discharge._.,, I Pond Vol gallons Vol acre feet / 1 �56(300 0.173 2 ! ¢5,700 0.202 A- 3 133,900 0.104 X 4 ' ' 64,200 0.197 5 ;' 168,000 0.516 6 168,000 0.516 / X X Scale: 1" 100' Dewatering Pond Typical Cross Sections X X Last Chance Pond Volume Gallons Acre feet pillway 76,600 +4 +2 -2 4 6- a�00 .4 0 6- 0 +00 0 +5 0 +20 n I 1 0 +15 0 +20 0 +25 0 +30 0+35 0 +40 SECTION D - D' C EMERGENCY SPILLWAY Last Chance Pond i IBPoCINQ GROUND_...— _1 Scale: 1" = 20' Contour interval: 1 foot 0 +40 0+60 0 +a0 0 +100 01120 0 +140 0 +160 SECTION E - E' 0inwI.9 1115: \PERMIT - MINI G \Map 157\Map 157 - 13- dewatering hole - H FC i� Water from the B -seam will be pumped through Service Hole SH -3 to the surface. This water is expected to carry excessive suspended solids which will be treated by the settling ponds shown on this drawing. Following settling and passing through the artificial wetlands this water will be discharged via an approved NPDES discharge point. Designs shown are the initial construction. Slight modifications may occur during operation to better improve efficiency of the structures while preserving the intent and general character of the designs. Hydrologic modeling only used Ponds 3, 4, and the 'Last Chance' pond. The first two ponds were considered operational for handling sediment removed from the mine with the water. Ponds 5 and 6 were added to add incorporate an additional factor of safety to allow time to respond to unforeseen treatment needs. Artificial wetland are expected to evolve over time. Initial construction was less than ideal and plans are to modify this area to create additional shallow water retention areas. The intent is to create shallow wetlands over approximately 50% of the area. The actual extent will be dictated, in part, by the rate water is pumped from underground. Water will be distributed through a series of berms and sumps. Best management practices will be used to control erosion prior to vegetation establishment. The area is surrounded by an exclosure fence designed to keep livestock out. This is necessary to prevent damage to the wetlands and diversion structures associated with this facility. See Illustration 55 for detailed hydrologic modeling C 11 =10' CEI v ED 1202012 of Reclamation, 19 & Safety C' 2O' 20 4 ,' MIN 4' 2' d50 RIP RAP 1S' AT HIGHESN EW _ 4' 1 -3' RIP RAP IN E118ANKMetr SECTION A -A' dw RIP RAP SECTION 8 -13' C• 1 As -built 2 1 Revised As -built to add more detail 3 jAdded Dewatering Ponds 5 & 6 5608.00 560775 5607.50 5607.25 5607.00 — 5606 I5 o1oo 8/2012 2/2012 ,ORNBN& GROUND -. 1 POND EMRANN "'LINO GROUND CNANNEL ROW 0 r30 0 +40 SECTION C -C' 0 +50 FlNRHED POND EMaA� --I 0 +60 0 +20 D +30 0,10 0 +50 0 +60 SECTION D -D' C 19 l W s BLUE MOUNTAIN ENERGY, INC. DESERADO MINE RANGELY, COLORADO Map 157 B -Seam Dewatering D-g. by. Dwg. Fite Name: scw Map 157 - 13- dewatering holes Chk. by Appr. by- [Date: as noted Date: 4/17/2012 Rev. 3 ss08 _,,ORIGINAL GROUND SPILLWAY FLDWW 5604 NLSHED POND aCAV 71I0N 5602 5600 ,J 8 O+00 0 +10 0 +- C• 1 As -built 2 1 Revised As -built to add more detail 3 jAdded Dewatering Ponds 5 & 6 5608.00 560775 5607.50 5607.25 5607.00 — 5606 I5 o1oo 8/2012 2/2012 ,ORNBN& GROUND -. 1 POND EMRANN "'LINO GROUND CNANNEL ROW 0 r30 0 +40 SECTION C -C' 0 +50 FlNRHED POND EMaA� --I 0 +60 0 +20 D +30 0,10 0 +50 0 +60 SECTION D -D' C 19 l W s BLUE MOUNTAIN ENERGY, INC. DESERADO MINE RANGELY, COLORADO Map 157 B -Seam Dewatering D-g. by. Dwg. Fite Name: scw Map 157 - 13- dewatering holes Chk. by Appr. by- [Date: as noted Date: 4/17/2012 Rev. 3