2012-07-31_PERMIT FILE - C1981018A

Home Browse Search

I i. i X Emergency Spillway 108,200 0.332 J DISCHARGE ` O P TO WASH i GII �+ ro + A- SH -:� f \ t� II ha cted the impoundments described herein and certify that they have been constructed to the intent of the design and in accordance with the approved plan and applicable regulations. A X IPond volumes at point of discharge. - Pond V01 gallons Vol acre feet ! A r 1 56,300 0.173 %< 2 65,700 0.202 3, 33,900 0.104 A4 64,200 0.197 X Scale: 1" 100' Dewatering Pond Typical Cross Sections .a +2- 0 2 4 6- 0 +c0 +4 +2+< 0 -2 4 -6- 0+00 0 +5 0 +20 0 +m D +4v 8+15 SECTION D - D' 0 -w0 SECTION E - E' 1ElE/ "_ / w1 cROam TOPSO L 0,20 0 +25 0+30 0 +35 D +40 ifMEGIWI GROUND SUIML\ 0 +80 0 +100 D +120 ,1140 u +160 11119 1 OAPERMIT - 0 EMERGENCY SPILLWAY Jason Tuttle Colorado Licensed Professional Engineer #43992 Last Chance Pond Scale: 1" = 20' Contour interval: 1 foot 157 - 'H' �l e' 12 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. Additional room and material volume for another 'Dewatering' pond is available based on the pre- construction footprint and reclamation bonding volumes. This will allow expansion, if needed, to accommodate unforeseen treatment needs. Artificial wetland are expected to evolve over time. Initial construction is shown with additions/ modifications expected within the wetland footprint shown. 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 trenches. 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, 1 I As -built 2 Revised As -built to add more detail C A' an 020 1 —FOOT- B 'H' FLUME Scale: 1" = 10' C RECEIVE 2 4 JUL 2 6 2012 1S' AT HIGHEST POINT 4 7 -3' RIP RAP 11 MIN '4^"— 4- 2' d50 RIP RAP IN INIEANNMENT oivisi ciaab e -12• THICK 12• SECTION A -A' M rvn f Re do d5o RIP RAP SECTION B -B' $ 5a %fy 5608 5606' 5604 5602 5600 5598 0 +00 560800 560 /75 5607.50 5607.25 5607.00 -- 5666 ,5 0100 3 ORIGINAL GROUND SPUWI POND EXCAVATION POND ELIHANI<MENT ^'LNG GROUND CHANNEL FLOW 1OhE T 0 +10 0 +20 0 +30 0+40 0 +50 SECTION C -C' 0 +10 0 +20 FlNbHED POND EMBANKMENT 0 +60 0 +30 0 +4o 0 +50 0 +60 SECTION D -D' c- tCS I --WN mfz -l5A BLUE MOUNTAIN ENERGY, INC. DESERADO MINE RANGELY, COLORADO Map 157 B -Seam Dewatering 'g. by. D vg. File Neme: sew Map_ 157 - B- dewatering holes k. by. Appr. by. ite. as noted Dates. 4/17/2012 Rev. 2 Last Chance Pond Volume ' Gallons Acre feet y Primary Spillway 76,600 0.235 ! i Emergency Spillway 108,200 0.332 J DISCHARGE ` O P TO WASH i GII �+ ro + A- SH -:� f \ t� II ha cted the impoundments described herein and certify that they have been constructed to the intent of the design and in accordance with the approved plan and applicable regulations. A X IPond volumes at point of discharge. - Pond V01 gallons Vol acre feet ! A r 1 56,300 0.173 %< 2 65,700 0.202 3, 33,900 0.104 A4 64,200 0.197 X Scale: 1" 100' Dewatering Pond Typical Cross Sections .a +2- 0 2 4 6- 0 +c0 +4 +2+< 0 -2 4 -6- 0+00 0 +5 0 +20 0 +m D +4v 8+15 SECTION D - D' 0 -w0 SECTION E - E' 1ElE/ "_ / w1 cROam TOPSO L 0,20 0 +25 0+30 0 +35 D +40 ifMEGIWI GROUND SUIML\ 0 +80 0 +100 D +120 ,1140 u +160 11119 1 OAPERMIT - 0 EMERGENCY SPILLWAY Jason Tuttle Colorado Licensed Professional Engineer #43992 Last Chance Pond Scale: 1" = 20' Contour interval: 1 foot 157 - 'H' �l e' 12 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. Additional room and material volume for another 'Dewatering' pond is available based on the pre- construction footprint and reclamation bonding volumes. This will allow expansion, if needed, to accommodate unforeseen treatment needs. Artificial wetland are expected to evolve over time. Initial construction is shown with additions/ modifications expected within the wetland footprint shown. 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 trenches. 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, 1 I As -built 2 Revised As -built to add more detail C A' an 020 1 —FOOT- B 'H' FLUME Scale: 1" = 10' C RECEIVE 2 4 JUL 2 6 2012 1S' AT HIGHEST POINT 4 7 -3' RIP RAP 11 MIN '4^"— 4- 2' d50 RIP RAP IN INIEANNMENT oivisi ciaab e -12• THICK 12• SECTION A -A' M rvn f Re do d5o RIP RAP SECTION B -B' $ 5a %fy 5608 5606' 5604 5602 5600 5598 0 +00 560800 560 /75 5607.50 5607.25 5607.00 -- 5666 ,5 0100 3 ORIGINAL GROUND SPUWI POND EXCAVATION POND ELIHANI<MENT ^'LNG GROUND CHANNEL FLOW 1OhE T 0 +10 0 +20 0 +30 0+40 0 +50 SECTION C -C' 0 +10 0 +20 FlNbHED POND EMBANKMENT 0 +60 0 +30 0 +4o 0 +50 0 +60 SECTION D -D' c- tCS I --WN mfz -l5A BLUE MOUNTAIN ENERGY, INC. DESERADO MINE RANGELY, COLORADO Map 157 B -Seam Dewatering 'g. by. D vg. File Neme: sew Map_ 157 - B- dewatering holes k. by. Appr. by. ite. as noted Dates. 4/17/2012 Rev. 2