2022-07-13_REVISION - M2005066 ‎(3)‎

• Permit No: M2005066
• IBM Index Class Name: Revision
• Doc Date: 7/13/2022
• Doc Name: Slope Stability Analysis
• From: Oldcastle Material Southwest Group
• To: DRMS
• Type & Sequence: SO2
• Email Name: ECS
• Email Name: MAC
• Email Name: SMS
• Email Name: AWA
• Media Type: D
• Archive: No

ACTIVE MINING SLOPE ANALYSIS
0+ 0' 0+ 0' 0+40' 0+60' 0+ 0' 1+ 0' 1+ 0' 1+40' 1+ 0' 1+ 0' 2+ 0'
4960' 960'
--27.9"
25"
4950 950'
�••�`•��• NEAR VERTICAL ACTIVE SLOPE
l
4940' •: 940'
FAILURE CIRCLE FROM ACTIVE MINING SLOPE
930'
FS=1 s
4930' �`.�
4920' 920'
4910' 910'
0+ 0' 0+ 0 0+40' 0+ 0' 0+ 0' 1+ 0' 1+ 0' 1+40' 1+ 0' 1+ 0' 2+ 0'
FINAL MINING SLOPE ANALYSIS
0+ 0' 0+ 0' 0+40' 0+60' 0+ 0' 1+ 0' 1+ 0' 1+40' 1+ 0' 1+ 0' 2+ 0'
4960' 960'
6.3"
25 49501 — 950'
�••�••�•'��'. 2HaV BACKFILLED MINING SLOPE
I `
4940' 940'
FAILURE CIRCLE FROM FINAL MINING SLOPE
FS=1.5
4930'
930'
i
4920' 920'
4910, 910,
0+00' 0+ 0' 0+40' 0+60' 0+80' 1+ 0' 1+ 0' 1+40' 1+ 0' 1+ 0' 2+00'
RECLAIMED SLOPE ANALYSIS
0+ 0' 0+ 0' 0+40' 0+60' 0+ 0' 1+ 0' 1+ 0' 1+40' 1+ 0' 1+ 0' 2+ 0'
4960' 960'
23.0"
'L CJn SLOPE FAILURE ENTIRELY ON
4950' RECLAIMED FACE 950'
�• w • 'I 3HAV BACKFILLED RECLAMATION SLOPE
4940' LEGEND
i WORST CASE FAILURE CIRCLE FROM RECLAIMED SLOPE 940'
FS=2.04 BOUNDARIES d STRUCTURES
4930' 930' A Mm,nglRedeimed Sbpe
Nearest Structure Location x
Failure Cirde --- ----
i Slurry Wall(Apprm.)
4920' 920' Groundwate,Level �•• ••�
Topsoil:Overburden:Backfil
Sand and Gravel Deposit
4910' 910, Bed,00k —
0+ 0' 0+ 0' 0+40' 0+60' 0+80' 1+ 0' 1+ 0' 1+40' 1+ 0' 1+ 0' 2+ 0'
DRMS Permit Number:M-2005-066 Asphalt Paving Company Map Geo.Info.: Datum:CID CENTRAL Projection:NAD83
• • _ • • Survey Source:N/A Survey Date:—
Mine Entry Location: Latitude:40.02472 Longitude:104.86333 L 1
State:CO County:Weld Nearest Town:Wallenberg Imagery Source:CDs Imagery Date:May 2021
•- • • • Section:25 Township:IN Range:67W PM:6th PM Drawn by:SAC Date:05118/2022
Major Watershed:— Checked by:BEL Date:05/19/2022 3375 West Powers Circle
Approved by:— Date:— Littleton.CO USA 80123 (303)-346-5196 [e-mail]