2012-02-28_REVISION - M1980244 (58)

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L___ 1 EMP -018 Plan View 1 " =50' (D -Size Dwg) ECA KIP 1_0 So1- SA ti ESHOB \ 6 0 HDPE \ \ \ SDR17Pipe/ine rest Replaced with Open \ Ditch after WHEX - �'ti -- is backfilled \\ �Z�_l� \f��■titi[i Normal Withdrawal 0.7Acre feet / with 3- SolarPumps in Parallel i l @ Sgpm /40 psi \ Storm withdrawal 2.6Acre feet - - -� ' using Mobile /Diese120 HP Pump _ - �at 1 cfs /110 ft TDH t� j•' •� e e��LiN�r�- Emergency Spillway for EMP - lyti u Backflowfrom Pond through Ditchx Total Earthwork _ \ Balanced Cat/Fill - 8,200 CY - 6'0 Riser Pipe Spillway with NO j 6- PO Perforations atl2"centers I� Cut 4 it below grade and build Embankment to Elev. 100.5.5 to provide 9.9 Acre feet Capacity j Note: EMP -019is Temporary and will be removed by WHEX. It will be replaced after WHEX \ Backfill with Permanent ; EMP -019 _ Plan View 1 "=50'(D-Size Dwg) EMP- 017N- Coarse Sediment - Trap - Upgrade Existing pond as needed. Pond will remove all Sand and coarse SiltBasing B -1, GZ and EMP- 017Main - Rehabilitate outfall from EMP -016 Existing Cameron Pond for Total Designedfor Sediment Removal �8ss Capacityof19.7AcrcFeet Pond `• efficiency. EFn serves as Clear-water pool and dE source for dust - control & �--� construction water P 1 12 "Outlet Riser with Inlet at El. 10014. Routes ` and reduces flow to EMP- 019Main \ to 6 cis for improved settling effectiveness. O /III \ , 6" Lrnw -level 100- I rS P illwa y to � Drahn an d Riprap -water Pump System to Spilhway EMP- 17Cear Evacuate EMP- 017anduse \ 6) Grass lined Interceptor water for Dust Control and \ \ \ for Basin ECOSA -C2 Construction water \ l EMP - 0175 - Coarse Sediment Trap for Basin ECOSA-DI From Basin Existing pond upgraded as ECOSA -Dl necessary. e � Eon \ \ 1 4 r -)EMP -017 (Rebuilt Cameron Ponds) Plan View 1 " =50' (D -Size Dwg) Notes and General Specifications: 1. The dimensions and construction of ditches are listed on Tables at right, along with the armoring requirements (3" Riprap, 6" Riprap or vegetated channels). The freeboard includes a minimum of 6- inches at the 100 year calculated discharge plus the velocity head depth. 2. EMP Ponds and their embankments are intended to be water tight because of their proximity to high walls of the mining areas. Accordingly, they shall be constructed to conform to the following general specifications: a. Strip the footprint of the pond area down to suitable non - organic soi /s with no less than 15 -20% fines ( <200 mesh). Proof roll the footprint and compact as needed to achieve a target density of no less than 90% in the basin and no less than 95% Std Proctor in the embankmant. b. Select soils for the embankment that have at least 15% fines. Place and compact the embankment soils in 8 -inch maximum loose layers and compact to at least 95% Std. Proctor density. a Maximum slope of embankment shall be 2 :1. Maximum slope inside sediment basin shall be 1.75-1. Maximum slope of reseeded areas shall be 3 :1. 3. An emergency spillway shall be constructed at each pond with a finished invert elevation approximately 2.0 feet lower than the crest and a base width of 6.0 feet. The spillway shall be armored with 6" angular nprap place on 6- inches of sandy-gravel bedding and a layer of Mirlfl drain fabric. EUE 21MS a� Q Q, ^n t .n -/ Total Earthwork Balanced CutlFill -3,000 CY North Interceptor at Toe ofECOSA Embankment South Interceptor at Toe ofECOSA embankment 5 EMP -020 Plan View 1 "=50'(D-Size Dwg) Grassy Valley Storm Water Management Area Wild Horse Extension (WHEX) and ECOSA - Transfer Pumps -1 R Temporary -- gpm Solar & One cis -- Basmi Basin Mobile @ 100ftTDH .A Basin WHEX - WHEX-B1 Vindicator WHEX -D Basin _ i� VIN-A 1 Basin Basin EMP -01, WHEX -C 5.7AF EMP -010 Temporaryr `------- - - - - -- 3. Basin asin WHFX -F 9.9AF Basin ECOSA Al Perforated Weep Pipe_ EMP -01i Drain 52AF J Basin ECOSA-81 Sed EMP -017/ Basin Tra 19.7AF -40 0 0 M M 0 0 E M MIL EMP -013 Spillway ■ 1.BAF ■ Spillway ■ ■ After WHEY ■ Backfill, Grassy 1 ■ Valley is Restored & ■ Highway Basins Perforated ■ ilowDirect to �i Weep Pipe 0 Grassy Creek Drain ■ wlo Detention ■ Basin ■ ECOSA-E1 ■ Spillwa ■ EMP -020 y Basin ■ 9-0AF i way ECOSA-D7 ■ - ■ V 10 Upper Grasser Valley Storm Water Management Area Schematic a ETW, Existing Riprap Lined Channel from EMP-10 \ Construct Perforated Riser Spillway - 610 Pipe with ea. 1 k3 Perf. @ 12" Centers �E4A �A= -\ - Edstin EMP -016 eF Verify Capacity at 5.2 Acre feet \\\ V6 AF -qwI Channel from NW Toe I, ! ofE 3 Existing EMP -016 Plan View 1 "=50'(D-Size Dwg) Total Earthwork Balanced CutlKll - 16,000 CY Pond Capacity 9Acre Feet a EMP- Name 1024 Area Base (Ac) -EMP-018 Capacity @Crest (Ac -Ft) Outlet Pipe (in) E Spillway Width (ft) Spillway Elev. 4 EMP -18 10200 7po .55 57 6 "S i 10204.0 ,I L___ 1 EMP -018 Plan View 1 " =50' (D -Size Dwg) ECA KIP 1_0 So1- SA ti ESHOB \ 6 0 HDPE \ \ \ SDR17Pipe/ine rest Replaced with Open \ Ditch after WHEX - �'ti -- is backfilled \\ �Z�_l� \f��■titi[i Normal Withdrawal 0.7Acre feet / with 3- SolarPumps in Parallel i l @ Sgpm /40 psi \ Storm withdrawal 2.6Acre feet - - -� ' using Mobile /Diese120 HP Pump _ - �at 1 cfs /110 ft TDH t� j•' •� e e��LiN�r�- Emergency Spillway for EMP - lyti u Backflowfrom Pond through Ditchx Total Earthwork _ \ Balanced Cat/Fill - 8,200 CY - 6'0 Riser Pipe Spillway with NO j 6- PO Perforations atl2"centers I� Cut 4 it below grade and build Embankment to Elev. 100.5.5 to provide 9.9 Acre feet Capacity j Note: EMP -019is Temporary and will be removed by WHEX. It will be replaced after WHEX \ Backfill with Permanent ; EMP -019 _ Plan View 1 "=50'(D-Size Dwg) EMP- 017N- Coarse Sediment - Trap - Upgrade Existing pond as needed. Pond will remove all Sand and coarse SiltBasing B -1, GZ and EMP- 017Main - Rehabilitate outfall from EMP -016 Existing Cameron Pond for Total Designedfor Sediment Removal �8ss Capacityof19.7AcrcFeet Pond `• efficiency. EFn serves as Clear-water pool and dE source for dust - control & �--� construction water P 1 12 "Outlet Riser with Inlet at El. 10014. Routes ` and reduces flow to EMP- 019Main \ to 6 cis for improved settling effectiveness. O /III \ , 6" Lrnw -level 100- I rS P illwa y to � Drahn an d Riprap -water Pump System to Spilhway EMP- 17Cear Evacuate EMP- 017anduse \ 6) Grass lined Interceptor water for Dust Control and \ \ \ for Basin ECOSA -C2 Construction water \ l EMP - 0175 - Coarse Sediment Trap for Basin ECOSA-DI From Basin Existing pond upgraded as ECOSA -Dl necessary. e � Eon \ \ 1 4 r -)EMP -017 (Rebuilt Cameron Ponds) Plan View 1 " =50' (D -Size Dwg) Notes and General Specifications: 1. The dimensions and construction of ditches are listed on Tables at right, along with the armoring requirements (3" Riprap, 6" Riprap or vegetated channels). The freeboard includes a minimum of 6- inches at the 100 year calculated discharge plus the velocity head depth. 2. EMP Ponds and their embankments are intended to be water tight because of their proximity to high walls of the mining areas. Accordingly, they shall be constructed to conform to the following general specifications: a. Strip the footprint of the pond area down to suitable non - organic soi /s with no less than 15 -20% fines ( <200 mesh). Proof roll the footprint and compact as needed to achieve a target density of no less than 90% in the basin and no less than 95% Std Proctor in the embankmant. b. Select soils for the embankment that have at least 15% fines. Place and compact the embankment soils in 8 -inch maximum loose layers and compact to at least 95% Std. Proctor density. a Maximum slope of embankment shall be 2 :1. Maximum slope inside sediment basin shall be 1.75-1. Maximum slope of reseeded areas shall be 3 :1. 3. An emergency spillway shall be constructed at each pond with a finished invert elevation approximately 2.0 feet lower than the crest and a base width of 6.0 feet. The spillway shall be armored with 6" angular nprap place on 6- inches of sandy-gravel bedding and a layer of Mirlfl drain fabric. EUE 21MS a� Q Q, ^n t .n -/ Total Earthwork Balanced CutlFill -3,000 CY North Interceptor at Toe ofECOSA Embankment South Interceptor at Toe ofECOSA embankment 5 EMP -020 Plan View 1 "=50'(D-Size Dwg) Grassy Valley Storm Water Management Area Wild Horse Extension (WHEX) and ECOSA - Transfer Pumps -1 R Temporary -- gpm Solar & One cis -- Basmi Basin Mobile @ 100ftTDH .A Basin WHEX - WHEX-B1 Vindicator WHEX -D Basin _ i� VIN-A 1 Basin Basin EMP -01, WHEX -C 5.7AF EMP -010 Temporaryr `------- - - - - -- 3. Basin asin WHFX -F 9.9AF Basin ECOSA Al Perforated Weep Pipe_ EMP -01i Drain 52AF J Basin ECOSA-81 Sed EMP -017/ Basin Tra 19.7AF -40 0 0 M M 0 0 E M MIL EMP -013 Spillway ■ 1.BAF ■ Spillway ■ ■ After WHEY ■ Backfill, Grassy 1 ■ Valley is Restored & ■ Highway Basins Perforated ■ ilowDirect to �i Weep Pipe 0 Grassy Creek Drain ■ wlo Detention ■ Basin ■ ECOSA-E1 ■ Spillwa ■ EMP -020 y Basin ■ 9-0AF i way ECOSA-D7 ■ - ■ V 10 Upper Grasser Valley Storm Water Management Area Schematic a ETW, Existing Riprap Lined Channel from EMP-10 \ Construct Perforated Riser Spillway - 610 Pipe with ea. 1 k3 Perf. @ 12" Centers �E4A �A= -\ - Edstin EMP -016 eF Verify Capacity at 5.2 Acre feet \\\ V6 AF -qwI Channel from NW Toe I, ! ofE 3 Existing EMP -016 Plan View 1 "=50'(D-Size Dwg) Total Earthwork Balanced CutlKll - 16,000 CY Pond Capacity 9Acre Feet a 6"0 Riser Pipe 15' 6 ea. 1 "'0 Holes at 12" Vertical Centers Depth nom ( Crest Area (Ac) 2 t . ft 2 2 1 � � - Sp#&My '.. i � � EtevaNeon �- .. : .. Base Area (Ac) Sediment Allowance (2 ft. typ) Pond Dimensions SEDCAD Structure ID EMP- Name 1024 Area Base (Ac) -EMP-018 Capacity @Crest (Ac -Ft) Outlet Pipe (in) E Spillway Width (ft) Spillway Elev. 4 EMP -18 10200 7po .55 57 6 "S 6 10204.0 7 EMP -10 W .20 .55 3.9 None Natural Slope 10125 -0 9 EMP -19 10160 Natural 1.72 9.9 6 "P X 10055.0 11 EMP -16 10120 Slope WHEX Mine Area Backfill 6"P Cut through �, Ridge ° 10039.0 15 EMP -17N 10080 .131 283 1.6 12 "S 10.0 10018.0 16 EMP -17M 10040 -88 1 -57 19.7 None 6.0 9989.0 S2 EMP 20 100W 0 r\ w rn cfl o None o o t\ o i, N rn rn co V1 EMP -13 DATUM E7L 9 N .27 o None ai ri co N co %__: (o 10100.0 10 EC -A 20 45 4.2 _ 1.1 m to N i7 c� 12 EC -B N 99� 0. 00 0 N ti 0 0 0 `- A 0 0 0 �- 0 0 _ N 0 N 0 0 0 0 0 0 0 0 0 0 Pipe EC -C A n R• n A A n n n n n A n 13 ED -G 0 +00 5 +00 10 +00 15 +00 20 +00 25 +00 30 +00 35 +00 40 +00 45 +00 .9 PROFILE B, �7) SHEET 3- Reconstructed Stream Corridor Across WHEX after Backfill 10 21 Profile View 1" =500 ft (DSize) 4 .9 1.7 6 S1A EC -E 6"0 Riser Pipe 15' 6 ea. 1 "'0 Holes at 12" Vertical Centers Depth nom ( Crest Area (Ac) 2 t . ft 2 2 1 � � - Sp#&My '.. i � � EtevaNeon �- .. : .. Base Area (Ac) Sediment Allowance (2 ft. typ) Pond Dimensions SEDCAD Structure ID EMP- Name Depth (t) Area Base (Ac) Nea Crest (Ac) Capacity @Crest (Ac -Ft) Outlet Pipe (in) E Spillway Width (ft) Spillway Elev. 4 EMP -18 15 -22 .55 57 6 "S 6 10204.0 7 EMP -10 W .20 .55 3.9 None 6.0 10125 -0 9 EMP -19 10 .375 1.72 9.9 6 "P 6 -0 10055.0 11 EMP -16 15 .21 .76 5.2 6"P 6 10039.0 15 EMP -17N 8 .131 283 1.6 12 "S 10.0 10018.0 16 EMP -17M 15 -88 1 -57 19.7 None 6.0 9989.0 S2 EMP 20 15 .39 .84 9.0 None 6.0 99425 V1 EMP -13 10 .10 .27 1.8 None 60 10100.0 Notes: 1. Select Ponds include outlet risers consisting of 6" HDPE' Pipe and 1 "0` perforations, 6 per row, at 12 -inch intervals. 2. Pond sizes include 2 ft. deep allowance for sediment actcumulation- 3. Emergency Spillways are generally 24- inches below crest. 4. EMP Ponds with Perforated Outlet drains are not terminal facilities and may be designed for one 10 yr /24 -hr storm volume since their contents are automatically evacuated to a terminal storage ibasin. r�EMP- Pond Dimensions Table Fbd QH 4 ' Width Bedding: Mirifi Drain Fabric or 6" well graded cobble to sand crushed stone. Channel Dimensions SEDCAD Channel ID Channel Name 10 -Yr Flow cfs 100 -yr (lob cfs Avg. dope Bottom Width (R) Flow Depth Chan. Depth RipRap D50(nom) 1 WH A 9 17 5.8 4 1.5 2.6 3 2 WH B 14 27 3.1 4 .7 1.5 3 3 WH -C1 6 15 70 4 .6 1.5 3 WH -C2 23 44 8.0 4 1.0 2.3 6 6 WH -D 22 46 10.7 7 a 8 2.0 6 8 WH -E 60 120 3.3 6.5 1.8 3.0 6 WH -F 2.5 3.4 5.0 4 0.5 1.5 6 Pipe MP -18 1 1 6 "PE 10 EC -A 20 45 4.2 4 1.1 2.3 6 12 EC -B 55 106 11.5 6 1.4 3.1 6 Pipe EC -C 6 6 8 12'PE 13 ED -G 10 26 1.4 4 .9 1.7 6 14 EC -D 10 21 1.4 4 .9 1.7 6 S1A EC -E 21 42 4.7 4 1.1 23 6 SIB ED -F 41 84 4.7 8 1.1 2.5 6 V1 VIA 10 36 25 6 0.6 2.1 6 g)Table Channel Dimensions and Design Specifications Runoff from 6r' HDPE Pi ellne EMP -17 Brow Ditch along p Cameron Ponds Crest of WHEX Mine Area County Road from EMP -18 to 10320 EMP-16 (SDR17) EMP -19 Reconstructed to 10280 Receive water from all 10240 ' - [existing] EMP- s for reuse as �_ 10200 _ 2 tt Vent at �_, Construction Water 10160 High Point EMP -16 10120 EMP -18 with7.SHP [existing] 10080 10040 Transfer Pump �'� - 0 0 o M >� o N 0*) m o tp M I. t\ to N o o N o d. - -- � - -- rn co DATUM EL91� " o ai ai ni of ad cd <r ai o N cri o tti cD N N cfl ai ao tri tri tti co M o 0 01 0[) t[7 N O t\ 0t1 M M Ott f\ l[1 t�j OC1 tt) M OO M M M M M so W W w w N N N N N N N N t` - 0 0 0 0 r3 0 0 0 0 O o o 9<9f30.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C3 0 0 0 0 0 0 +00 5 +00 10 +00 15 +00 20 +00 25 +00 30 +00 35 +00 40 +00 45 +00 50 +00 55 +00 60 +00 65 +00 70 +00 75 +00 80 +00 PROFILE A SHEET 3- Grassy Valley Storm Water Channel and EMP- Ponds Profile View 1 " =500 ft (DSize)