ATTACHMENT 0006 - Appendix E - Soil Boring Report - Print.pdf

Attachment C Soil Description Charts

2149 Rodman Avenue Rock Island Arsenal, Illinois

July 12, 2021

Lab No. 21003638.00

C-1

SSoilss Descriptions

Soils descriptions are based on the Unified Soil Classification System and ASTM D2488 (visual-manual procedure) unless otherwise indicated. Coarse-grained soils (sands and larger) have more than 50% of dry weight retained on a #200 sieve. They are described as boulders, cobbles, gravel or sand. Fine-grained soils have less than 50% of their dry weight retained on a #200 sieve. They are described as clays or silts depending on their liquid and plastic limits. There can be some sand content in the clays and can be some silt or clay content in the sands. Adjectives are used to further describe these materials.

For example:

Lean clay with sand is a clay of low plasticity, thus lean, having 15% to 29% sand grains mixed into it. Sandy lean clay is a clay of low plasticity having 30% to 50% sand grains mixed into it.

Relativee Propertiess off Sandd orr Gravell inn CClayy

Relativee Amountt off Finess Passingg ##2000 Sievee inn Sandd orr Gravell

Descriptive Term Percent of Dry Weight

Descriptive Term Percent of Dry Weight

Trace Sand* Less than 15 Trace Clay* Less than 5 With Sand* 15 to 30 With Clay 5 to 12

Sandy 30 to 50 Clayey 12 to 50 *or Gravel, Gravelly *or Silty, Silty

Grain--Sizee Terminology Descriptionn off Fine--Grainedd Soils Descriptive

Term Diameter (inches)

For Liquid Limits Less Than 50 PI > 7 Lean Clay

Boulders > 12 4 < PI < 7 Silty Clay Cobbles 3 to 12 PI < 4* Silt Gravel #4 Sieve to 3 For Liquid Limits of 50 and Higher Sand #200 to #4 Sieve Plots on or Above A-

Line Fat Clay

Silt or Clay < #200 Sieve Plots Below A-Line Elastic Silt *or below A-Line

Definitions

Liquid Limit (LL) Moisture content where soil changes from plastic to liquid state as determined by ASTM D4318

Plastic Limit (PL) Moisture content where soil changes from plastic to semi-solid state as determined by ASTM D4318

Plasticity Index (PI) Numerical difference between liquid limit and plastic limit (PI = LL - PL)

C-2

CConsistencyy off Cohesivee (Clayey)) Soils Description UCS (psf) Nblows/foot CBR* Appearance

Very Soft 0 to 500 0 to 2 0.0 to 0.4 Extruded through fingers when squeezed

Soft 500 to 1000 2 to 4 0.4 to 0.8 Molded by very light finger pressure

Medium 1000 to 2000 4 to 8 0.8 to 1.6 Molded by light finger pressure

Stiff 2000 to 4000 8 to 15 1.6 to 3.2 Readily indented by thumb

Very Stiff 4000 to 8000 15 to 30 3.2 to 6.4 Readily indented by thumbnail

Hard 8000+ 30+ 6.4+ Hard to indent by thumbnail

*California Bearing Ratio (CBR) = subgrade support value for paving expressed as a percent of value for standard crushed stone

RRelativee Densityy off Cohesionlesss (Sand)) SSoilss

GGrain--SSizee Terminology

Description Nblows/foot Friction Angle

(degrees)

Descriptive Term

Diameter (inches)

Very Loose 0 to 4 26 to 30 Boulders > 12

Loose 4 to 10 28 to 34 Cobbles 3 to 12

Medium 10 to 30 30 to 40 Gravel #4 Sieve to 3

Dense 30 to 50 33 to 45 Sand #200 to #4 Sieve

Very Dense 50+ 50+ Silt or Clay < #200 Sieve

NNote: Lower limits are for fine, clean sand and should be reduced by up to 5 degrees for silty sands. The upper limits are for coarse clean sands.

C-3

CCommentss oonn Soill Colorr Descriptions

Dark Gray, Blue, or Green Constant submergence with a total absence of available oxygen

Gray with Concretions Saturation with water of limited oxygen supply

Red-Brown, Yellow-Brown, and Olive-Brown

Abundant supply of oxygen under good condition of drainage

Red-Brown, Yellow-Brown, and Olive-Brown with Gray Mottles

Abundant supply of oxygen under poor drainage conditions (occasional to frequent saturation)

C -4

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IF

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S ym bo ls a nd

G ro up N am es

U si ng L ab or at or y Te st s

A

S oi l C la ss ifi ca tio n G ro up

S ym bo l G ro up

N am e B

C oa rs e-

G ra in ed oi ls

G ra ve ls

C le an G ra ve ls C u an d C c

E

G W

W el l-g ra de d gr av el

F

M or e th an

0% re ta in ed o n

N o.

si ev e

M or e th an

0% o f co ar se fr ac tio n re ta in ed o n N si ev e

Le ss t ha n 5% fin es C

C u a nd

/o r

C c

E

G P

P oo rly g ra de d gr av el

F

G ra ve ls w ith

Fi ne s

Fi ne s cl as si fy a s M

L or

M H

G M

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F, G

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2%

C Fi ne s cl as si fy a s

C L or M

H G

C C la ye y gr av el

F, G

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S an ds C le an

S an ds C u an d

C c

E

S W

W el l-g ra de d sa nd

I o r m or e of c oa rs e fr ac tio n pa ss es N si ev e

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D

C u a nd

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C c

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S P

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2%

D Fi ne s cl as si fy a s

C L or C

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C C la ye y sa nd G

, H , I

Fi ne

-G ra in ed

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C la ys in or ga ni c

P I > a nd p lo ts o n or a bo ve

"A " l in e

J C

L Le an c la y

K , L

, M o r m or e pa ss es t he

N si ev e

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P I < a nd p lo ts b el ow "A

" l in e J

M L

S ilt

K , L

, M or ga ni c

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-o ve n dr ie d

.7

O L

O rg an ic c la y K

, L , M

, N

Li qu id li m it

-n ot d rie d O rg an ic s ilt K

, L , M

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S ilt s an d C la ys in or ga ni c P

I p lo ts o n or a bo ve "A

" l in e J

C H

Fa t cl ay

K , L

, M

Li qu id li m it o r P

I p lo ts b el ow

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H E la st ic s ilt K

, L , M m or e or ga ni c Li qu id li m it -o ve n dr ie d

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O

H O rg an ic c la y

K , L

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-n ot d rie d O rg an ic s ilt K

, L , M

, Q

H ig hl y

O rg an ic oi ls

P rim ar ily o rg an ic m at te r, d ar k in c ol or , a nd o rg an ic o do r

P T

P ea t

-5

TTa bl ee N ot es

A

B as ed o n th e m at er ia l p as si ng t he

-in m m ) s ie ve

H

If f in es a re o rg an ic

, a dd

"w ith o rg an ic f in es " t o gr ou p na m e.

B

If f ie ld s am pl e co nt ai ne d co bb le s or b ou ld er s, o r bo th , a dd "w

I I f so il co nt ai ns

5% g ra ve l, ad d "w ith g ra ve l" to g ro up n am e.

co bb le s" o r

"b ou ld er s" , o r "b ot h" t o gr ou p na m e.

J If

A tt er be rg li m its p lo t in s ha de d ar ea

, s oi l i s a C

L- M

L, s ilt y cl ay

C

G ra ve ls w ith t o f in es r eq ui re d ua l s ym bo ls

: G W

-G M w el l-gr ad ed

K If s oi l c on ta in s t o p lu s N o.

, a dd "w ith s an d" o r

"w gr av el w ith s ilt

, G W

-G C w el l-g ra de d gr av el w ith c la y, G P

-G M p oo rly gr av el w hi ch ev er is p re do m in an t.

gr ad ed g ra ve l w ith s ilt

, G P

-G C p oo rly g ra de d gr av el w ith c la y.

L If s oi l c on ta in s p lu s N o.

p re do m in an tly s an d, a dd "s an dy

D

S an ds w ith t o f in es r eq ui re d ua l s ym bo ls : S

W -S

M w el l-gr ad ed to g ro up n am e.

sa nd w ith s ilt

, S W

-S C w el l-g ra de d sa nd w ith c la y, S

P -S

M p oo rly gr ad ed

M If s oi l c on ta in s p lu s N o.

p re do m in an tly g ra ve l, ad d sa nd w ith s ilt

, S P

-S C p oo rly g ra de d sa nd w ith c la y.

"g ra ve lly

" t o gr ou p na m e.

E C u

D

/ D

(D

)2 N

P I ≥ a nd p lo ts o n or a bo ve

"A " l in e.

D x D

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" l in e.

F If s oi l c on ta in s s an d, a dd "w ith s an d" t o gr ou p na m e.

P P

I p lo ts o n or a bo ve "A

" l in e.

G

If f in es c la ss ify a s

C L-

M L, u se d ua l s ym bo l G

C -G

M , o r S

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M

Q P

I p lo ts b el ow

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