REP01903

• Permit No: M1999098
• IBM Index Class Name: Report
• Doc Name: SLOPE STABILITY REPORT FOR RIVERVIEW RESOURCE
• Media Type: D
• Archive: No

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UNIFIED SOIL CLASSIFICATION SYSTEM
Soil Classificaticn
Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests"
Group Group Names
Symbol
Coarse~Grained Soils Gravels Clean Gravels Cu z < and t s Cc s Jc GW Well-graded pravelF
More loan 50% retainetl on More roan 50% of coarse Less loan 5 % Iinesc
Cu < 4 and/or 1 > Cc > 3E GP PoOA
raded
v
lF
No. 200 sieve fraction retain y g
p2
e
ed on
No. < slev0 Fines classify a5 ML or MH GM Silty gravelF~ °~"
Gravels with Fines
More than 12% lines° Fines classify as CL or CH GC Clayey prevelF~O'"
Sands Clean Santls Cu >_ 8 and 1 s Cc s 3E SW Wellyraded santl'
50°/. ar more of coarse IESS than 5 % finese
Traction passes Cu < 6 and/or 1> Cc > 3r SP PooAy pratletl sand
No. 1 sieve Fines classify as ML or MH SM Silly sand°• "~ ~
Santls with Fines
More than 12% lines° Fines classdy as CL or CH SC Clayey sand°~ "~'
Fine~Grainetl Soils Silts and Clays inorganic PI > 7 and plots on or above "A' Ilne' CL Lean clayx L 4
50 % or more passes the Llquitl limit less Than 50 ~
PI < 4 or plots below "A" line ML Silts• L 4
No. 200 slave
Llquitl Ilmit -oven dried
OrganlC Clayx L 4. N
or anic
9
< 0.75 OL
Llquitl limit -not dried Orpanlc sIItK L 4, o
Silts antl Clays inorganic PI plots on or above "A" line CH Fal clays~L 4
Llquitl Ilmil 50 or more pl plots below "A" line MH Elastic slltx• L 4
Organic clays. L 4. o
Liquid limit -oven dried
or anic
g
< 0.75 OH
Llquitl limit -not dried Organic sIItK L 4• °
Highly organic soils PAmarlly organic matter, dark In color, and organic odor Pf Peat
"Based on the material passing the 3~in. a ID~)~ xll soil contains 15 to 29 % plus No. 200, add
C
D
ID
C
(75-mm) slave. u =
~
~e
c = 'With santl" or 'With gravel", whichever is
x D
D
Blf fleltl sample contained cobhles or 10
~ predominant.
r
If soil contains z 15 % santl
atld "with sand" to
Oouldera, or both, atld "with cohbles or ,
4f soil contains z JO % plus. No. 200
boulders, or both" to rou name.
c 9 D Group name.
use dual symbol GG nr~eminantly sand, edtl "sandy" to group
°II floes classify as CL-ML
Gravels with 5 l0 12 % Tines require tlual ,

symbols: GM, or SC~SM.
411 9011 contains 230 % plus No. 200,
GWGM well~gretled gravel with sill "II fines are organic, atld 'With organic lines" to predominantly gravel, add "gravelly" to prpup
GWGC well~praded gravel with clay group name. name
GPGM poorly pratled gravel with silt 'll soil contains z 15 % gravel, atld 'With Gravel" to 4p1 z d and plots on or above "A" Ilne.
GP-GC poony graded gravel with clay group name. °PI < 4 or plots below "A' Ilna
°Santls with 5 to 12•/. Ilnes require duel dlf Atterberp limits plot In shatletl area, soil Is a CL "PI plots on or above "A" Ilne.
symbols: ML, silty clay.
"
"
°
SWSM well•pradetl sand with silt PI plots below
Ilne.
A
SW~SC well-graded sand with clay
SP~SM poorly graded sand with silt
SP-SC Doorly graded sand with clay
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1
' Form 111-885
60
a
X 40
W
Z
>r 30
r
U
F
Q 20
J
a
10
7
4
0
for olassllicaflon o/ llne~gralned soils
and linapralnad Traction of coarsa~ ~
grained soils ~
~
E
i
"
" \,
f
quat
on of
A
~ Ilne \
V
I ~~ I
Horizontal at PI = 4 to LL 25.5. I
'~J ~
~ ~ ~\
then PI = 0.73 ILL - 20)
- Q P
Equation of "U" ~ Ilne OP
Vertical at LL = 16 to PI = 7,
Th
PI
~
~J
en
= 0.91LL ~ 8) ~
-
/ I
/ ~ O~' ~
-
P
~ p ~
j ,' G~' I MH off OH,
~
~'

i ~ I I
-
CL•ML ~ MLoaOL I I
I I i ~
0 10 16 20 30 d0 50 60 70 80 90 100 110
LIQUID LIMIT (LL)
1 ~~rracon