2019-11-12_REVISION - M2004044 ‎(21)‎

• Permit No: M2004044
• IBM Index Class Name: REVISION
• Doc Date: 11/12/2019
• Doc Name: Adequacy Review Response #3
• From: Aggregate Industries
• To: DRMS
• Type & Sequence: AM1
• Email Name: JLE
• Email Name: ERR
• Media Type: D
• Archive: No

N TUCSON SOUTH PROPOSED GRAVEL MINE STABILITY ANALYSIS
TETRA TECH SLOPE STABILITY ANALYSIS - BRIGHTON DITCH
Ca one Bedrock Mohr-Coulomb 134 100 28
(peak strength)
■ Fill Mohr-Coulomb 126 25 28
°. Overburden Mohr-Coulomb 126 50 28
Sand and Gravel Mohr-Coulomb 137 0 35
■ Slurry Wall Mohr-Coulomb 122 0 0
Brighton Ditch Affected Land ■ Weathered Mohr-Coulomb 134 0 14
9 Boundary Claystone Bedrock
(residual strength)
35ft�
18 ft 15 ft -20 ft �I 1.53
4,986 •
4,976 .` Mine Slope not feasible. Material must be added for a 3H:1 V slope.
4,966
4,956
4=
�. 4,946
4,936
= 4,926
4,916
4,906
4,896
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250
Distance (ft)
Figure G-2 - Pseudostatic Analysis
Horizontal Acceleration Coefficient:0.067g