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3 EMP -022 <br />Plan View <br />1 " =100 ft (DSize) <br />Total Buffer <br />Encroachment <br />1.2 Acres <br />OPP- <br />M ' • • <br />mill • • <br />receives <br />1 <br />1 <br />bypassed around <br />structure <br />I le //� .• •' <br />Spillway <br />between 'I • <br />Pond b Receives Runoff <br />from South side <br />Minimal Area <br />outside Historic <br />Recreation Buffer <br />Historic <br />Recreation <br />Buffer Bndy. <br />From Basin PG Al <br />EM P -021 <br />2 Plan View <br />= -i uu n (u5ize) <br />o <br />Pond EMP -09_ a <br />7058 Cut <br />6506 fill <br />Net Shortage 552 <br />Capacity 2.8 AF <br />Lower South Ditc . <br />Flow from Basins <br />PG -B1 and PG -C1 <br />0 1 EMP -009 Four Ponds, a, b, c, and d <br />Plan View <br />1 " =100 ft (DSize) <br />Historic <br />�. Pond EMP -09b Recreation <br />2447 Cut y. <br />2993 fr!l Buffer Bnd <br />Net Excess 543 <br />Capacity 1.6AF <br />,-� ow from Basin PG E1 <br />`'fr <br />Pond EMP -09 c <br />9317 Cut <br />2842 fill <br />Net Excess 6476 <br />Capacity 3.9 AF <br />North Ditch is - Grade Ditch on <br />10120 Primarily an �-.� Follows Old -- Inside of Existing 10120 <br />interceptor, bandoned rade Roadway <br />10080 not a conveyance 10080 <br />10040 � �- channel /I- 10040 <br />10000 -L 10000 <br />PROFIL ED,- South Ditch - 9960 <br />9926 Sht.S into EMP -09a o f <br />-- - � _ I - __ 9920 <br />North Ditcb <br />into EMP -09b - - _ _ _. <br />9880 <br />9880 - <br />—� <br />9840 3 ?4% tYPi - PROFILE C, Sht. S 9840 <br />98000 a X, � o o o c o O 11", I- <br />N N o <br />9800 <br />LATUM LLEV <br />9761 cn tr of 26 m o ri ai � 1 rr rr er cd ri a6 ni <br />9 "150. 00 0 0 Qo 00 Co o co ao ao" mN - 00 00 00 - _.� - -� �- <br />rn rn a, % % rn rn a, rn rn a, rn o O, rn rn rn o, <br />15 +00 10 +00 5 +00 0 +00 5 +00 10 +00 15 +00 20 +00 25 +00 30 +00 35 +00 <br />6 PROFILES C & D - Lower North Ditch Cross Country to EMP -09 and Lower South Ditch along Access Road to EMP -009 <br />Profile View <br />- - - - <br />1 " =500 ft (DSize) � <br />From Basins <br />I <br />PG -B1 and PG -F1 <br />Edge of Schist Island <br />Mine Area and Backfill <br />Note: All but <br />Pond 009a will be eliminated <br />in 2017 and must be <br />reconstructed in 2018 when <br />backfill begins <br />Natural Channel <br />Tributary Flow <br />a <br />n 51=1 <br />PondE_MP -09d <br />_ <br />4100 Cut <br />1500 fill <br />Net Excess 2600 <br />Capacity 1.7AF <br />Profile F Sht. S -EMP-21 <br />- Profile E <br />_- __ sht. s <br />10120 10120 <br />10080 1.35% <br />- - 10080 <br />10040 - - ' 4 - 10040 <br />10000 <br />$56/0 0.17% 10000 <br />9960 9960 <br />rn o M o r\ rn N Cn 1.13 �_� <br />DATUM FLEV o rn m m m M 9920 <br />9900.00 °o °o °o °j a� O <br />R 0 +00 R d) <br />30 +00 25 +00 20 +00 15 +00 10 +00 5 +00 0 +00 5 +00 10 +00 <br />1PROFILES E & F - Upper South and North Ditches to EMP -21, to replace EMP -08a in 2014 <br />5 Profile View <br />1 " =500 ft (DSize) <br />4 PROFILE G- Poverty Gulch /Schist Island - Upper Ditch to EMP08a <br />Profile View <br />1" =500 ft (DSize) <br />Notes and General Specifications: <br />1. Ditches along access roads should generally be triangular cross - section to facilitate cleaning with a <br />road - grader. The dimensions tof ditches are listed on Sheet 5, along with the expected armoring <br />requirements (3" Riprap, 6" Rilnrap or vegetated channels). The freeboard is calculated to include a <br />minimum of 6- inches at the 100 year calculated discharge plus the velocity head depth. <br />2 EMP Ponds and their embankments are intended to be watertight because of their proximity to high <br />walls of the mining areas and Ito the Historic Recreation Buffer Zone. Accordingly, they shall be <br />constructed to conform to the Following general specifications: <br />a. Remove soils within the foortprint of the pond area down to suitable non - organic soils with no less <br />than 15 -20% fines ( <200 mesh?). Proof roll the footprint and compact as needed to achieve a target <br />density of no less than 90% in the basin and no less than 95% Std. Proctor in the embankmant. <br />b. Select soils for the embankiment that have at least 15% fines. Place and compact the embankment <br />soils in 8 -inch maximum loose layers and compact to at least 95% Std Proctor density. <br />G. Maximum slope of embankrnent shall be 2:1. Maximum slope inside sediment basin shall be 1.75.-1. <br />Maximum slope of reseeded arreas shall be 3:1. <br />3. An emergency spillway shall be constructed at each pond with a finished invert elevation <br />approximately 2.0 feet lower than the crest and abase width of 6.0 feet. The spillway shall be armored <br />with 6 "angular nprap place on, 6- inches of sandy - gravel bedding and a layer of Minrii drain fabric. <br />SCANNED <br />z <br />EMP -08a <br />Cresson Mine <br />Nlear Victor CO <br />Steffens Steffens and Associates, Inc. <br />S Water Resources- Environmental -Minin E ineerin <br />6 Engineering <br />Golden CC 80403 - 0: 303.216.1801 - C: 303.378.8181 <br />10320 <br />p <br />„3o/2B,2 <br />SDS <br />ME IC <br />Accepted for Use and <br />Low Area Graded - <br />- <br />10280 <br />__ <br />-3 52�% .4u9i <br />- <br />Z <br />to serve as Detention <br />AiL Drmuing Number <br />scale <br />Noted <br />DRAWING NO. <br />CCV10 SA( <br />Sht. 6 of 6 <br />,/N <br />Pond <br />10240 <br />- <br />10200 <br />Open Ditch <br />Graded <br />on E�dsting <br />;1- <br />10160 <br />N, <br />e <br />Roadways o <br />o m <br />M O <br />M o rn ca- <br />- <br />J <br />DA <br />O <br />r\ <br />O1 0.00 <br />N <br />O <br />N <br />o <br />N N N N N <br />0 0 o O O <br />N N <br />O O <br />N N <br />o O <br />n an L0 <br />N H � N, <br />of <br />MI <br />P <br />n <br />n n P A ti <br />ti n <br />n n <br />O O o O O O <br />n n N, ti n P <br />n O <br />O <br />0 +00 <br />5 +00 <br />10 +00 15 +00 <br />20 +100 <br />25 +00 <br />30 +00 35 +00 40 +00 <br />45 +00 <br />4 PROFILE G- Poverty Gulch /Schist Island - Upper Ditch to EMP08a <br />Profile View <br />1" =500 ft (DSize) <br />Notes and General Specifications: <br />1. Ditches along access roads should generally be triangular cross - section to facilitate cleaning with a <br />road - grader. The dimensions tof ditches are listed on Sheet 5, along with the expected armoring <br />requirements (3" Riprap, 6" Rilnrap or vegetated channels). The freeboard is calculated to include a <br />minimum of 6- inches at the 100 year calculated discharge plus the velocity head depth. <br />2 EMP Ponds and their embankments are intended to be watertight because of their proximity to high <br />walls of the mining areas and Ito the Historic Recreation Buffer Zone. Accordingly, they shall be <br />constructed to conform to the Following general specifications: <br />a. Remove soils within the foortprint of the pond area down to suitable non - organic soils with no less <br />than 15 -20% fines ( <200 mesh?). Proof roll the footprint and compact as needed to achieve a target <br />density of no less than 90% in the basin and no less than 95% Std. Proctor in the embankmant. <br />b. Select soils for the embankiment that have at least 15% fines. Place and compact the embankment <br />soils in 8 -inch maximum loose layers and compact to at least 95% Std Proctor density. <br />G. Maximum slope of embankrnent shall be 2:1. Maximum slope inside sediment basin shall be 1.75.-1. <br />Maximum slope of reseeded arreas shall be 3:1. <br />3. An emergency spillway shall be constructed at each pond with a finished invert elevation <br />approximately 2.0 feet lower than the crest and abase width of 6.0 feet. The spillway shall be armored <br />with 6 "angular nprap place on, 6- inches of sandy - gravel bedding and a layer of Minrii drain fabric. <br />SCANNED <br />z <br />NO. DATE MADE BY CKD.BY REMARKS <br />1211/11 SDS Preliminary Issue For Review <br />- <br />117112 SDS ME Added construction notes and profiles of ditches <br />Cresson Mine <br />Nlear Victor CO <br />Steffens Steffens and Associates, Inc. <br />S Water Resources- Environmental -Minin E ineerin <br />6 Engineering <br />Golden CC 80403 - 0: 303.216.1801 - C: 303.378.8181 <br />o <br />Ll.l <br />w <br />p <br />„3o/2B,2 <br />SDS <br />ME IC <br />Accepted for Use and <br />MLE2 - Storm Water Plan <br />NorthCresson and Poverty GI <br />EMP- Pond Details <br />CLIENT:CCBV Gold Mining Co. <br />_ _ <br />Z <br />AiL Drmuing Number <br />scale <br />Noted <br />DRAWING NO. <br />CCV10 SA( <br />Sht. 6 of 6 <br />,/N <br />A <br />- <br />